Last Modified: 05-13-2024 6.11:8.1.0 Doc ID: RM100000001GHBG
Model Year Start: 2020 Model: Corolla Prod Date Range: [01/2019 - 03/2019]
Title: 2ZR-FAE (ENGINE CONTROL): SFI SYSTEM: P0300-P0304; Random / Multiple Cylinder Misfire Detected; 2020 MY Corolla [01/2019 - 03/2019]

DTC

P0300

Random / Multiple Cylinder Misfire Detected

DTC

P0301

Cylinder 1 Misfire Detected

DTC

P0302

Cylinder 2 Misfire Detected

DTC

P0303

Cylinder 3 Misfire Detected

DTC

P0304

Cylinder 4 Misfire Detected

DESCRIPTION

When the engine misfires, high concentrations of hydrocarbons (HC) enter the exhaust gas. Extremely high hydrocarbon concentration levels can cause an increase in exhaust emission levels. Extremely high concentrations of hydrocarbons can also cause increases in the three-way catalytic converter temperature, which may cause damage to the three-way catalytic converter. To prevent this increase in emissions and to limit the possibility of thermal damage, the ECM monitors the misfire count. When the temperature of the three-way catalytic converter reaches the point of thermal degradation, the ECM blinks the MIL. To monitor misfires, the ECM uses both the cam position sensor and the crank position sensor. The cam position sensor is used to identify any misfiring cylinders and the crank position sensor is used to measure variations in the crankshaft rotation speed. Misfires are counted when the crankshaft rotation speed variations exceed predetermined thresholds. If the misfire count exceeds the threshold levels, and could cause emission control system performance deterioration, the ECM illuminates the MIL and stores a DTC.

DTC No.

Detection Item

DTC Detection Condition

Trouble Area

MIL

Memory

P0300

Random / Multiple Cylinder Misfire Detected

Simultaneous misfiring of several cylinders occurs and either of the following conditions is met (2 trip detection logic):

  • A misfire occurs that may damage the three-way catalytic converter (MIL blinks when detect immediately).
  • An emission deterioration misfire occurs (MIL illuminates).
  • Open or short in engine wire harness
  • Connector connection
  • Vacuum hose connections
  • Ignition system
  • Fuel injector assembly
  • Fuel pressure
  • Mass air flow meter sub-assembly
  • Engine coolant temperature sensor
  • Compression pressure
  • Valve timing
  • PCV valve and hose
  • PCV hose connections
  • Intake system
  • ECM

Comes on/Blinks*

*: The MIL flashes when a catalyst-damaging misfire is detected.

DTC stored

P0301

Cylinder 1 Misfire Detected

Misfiring of the No. 1 cylinder occurs and either of the following conditions is met (2 trip detection logic):

  • A misfire occurs that may damage the three-way catalytic converter (MIL blinks when detect immediately).
  • An emission deterioration misfire occurs (MIL illuminates).
  • Open or short in engine wire harness
  • Connector connection
  • Vacuum hose connections
  • Ignition system
  • Fuel injector assembly
  • Fuel pressure
  • Mass air flow meter sub-assembly
  • Engine coolant temperature sensor
  • Compression pressure
  • Valve timing
  • PCV valve and hose
  • PCV hose connections
  • Intake system
  • ECM

Comes on/Blinks*

*: The MIL flashes when a catalyst-damaging misfire is detected.

DTC stored

P0302

Cylinder 2 Misfire Detected

Misfiring of the No. 2 cylinder occurs and either of the following conditions is met (2 trip detection logic):

  • A misfire occurs that may damage the three-way catalytic converter (MIL blinks when detect immediately).
  • An emission deterioration misfire occurs (MIL illuminates).
  • Open or short in engine wire harness
  • Connector connection
  • Vacuum hose connections
  • Ignition system
  • Fuel injector assembly
  • Fuel pressure
  • Mass air flow meter sub-assembly
  • Engine coolant temperature sensor
  • Compression pressure
  • Valve timing
  • PCV valve and hose
  • PCV hose connections
  • Intake system
  • ECM

Comes on/Blinks*

*: The MIL flashes when a catalyst-damaging misfire is detected.

DTC stored

P0303

Cylinder 3 Misfire Detected

Misfiring of the No. 3 cylinder occurs and either of the following conditions is met (2 trip detection logic):

  • A misfire occurs that may damage the three-way catalytic converter (MIL blinks when detect immediately).
  • An emission deterioration misfire occurs (MIL illuminates).
  • Open or short in engine wire harness
  • Connector connection
  • Vacuum hose connections
  • Ignition system
  • Fuel injector assembly
  • Fuel pressure
  • Mass air flow meter sub-assembly
  • Engine coolant temperature sensor
  • Compression pressure
  • Valve timing
  • PCV valve and hose
  • PCV hose connections
  • Intake system
  • ECM

Comes on/Blinks*

*: The MIL flashes when a catalyst-damaging misfire is detected.

DTC stored

P0304

Cylinder 4 Misfire Detected

Misfiring of the No. 4 cylinder occurs and either of the following conditions is met (2 trip detection logic):

  • A misfire occurs that may damage the three-way catalytic converter (MIL blinks when detect immediately).
  • An emission deterioration misfire occurs (MIL illuminates).
  • Open or short in engine wire harness
  • Connector connection
  • Vacuum hose connections
  • Ignition system
  • Fuel injector assembly
  • Fuel pressure
  • Mass air flow meter sub-assembly
  • Engine coolant temperature sensor
  • Compression pressure
  • Valve timing
  • PCV valve and hose
  • PCV hose connections
  • Intake system
  • ECM

Comes on/Blinks*

*: The MIL flashes when a catalyst-damaging misfire is detected.

DTC stored

When DTCs for misfiring cylinders are randomly stored, but DTC P0300 is not stored, it indicates that misfires have been detected in different cylinders at different times. DTC P0300 is only stored when several misfiring cylinders are detected at the same time.

MONITOR DESCRIPTION

The ECM illuminates the MIL and stores a DTC when either one of the following conditions, which could cause emission deterioration, is detected (2 trip detection logic).

  • Within the first 1000 crankshaft revolutions after the engine starts, an excessive number of misfires (approximately 10 to 50 misfires per 1000 crankshaft revolutions) occurs once.
  • An excessive number of misfires (approximately 10 to 50 misfires per 1000 crankshaft revolutions) occurs a total of 4 times.

The ECM flashes the MIL (immediately detection logic) and stores a DTC (2 trip detection logic) when either one of the following conditions, which could cause damage to the three-way catalytic converter, is detected.

  • At a high engine speed, a sufficient amount of misfires to damage the catalyst occurring within 200 crankshaft revolutions is detected once.
  • At a normal engine speed, a sufficient amount of misfires to damage the catalyst occurring within 200 crankshaft revolutions is detected 3 times.

MONITOR STRATEGY

Related DTCs

P0300: Multiple cylinder misfire

P0301: Cylinder 1 misfire

P0302: Cylinder 2 misfire

P0303: Cylinder 3 misfire

P0304: Cylinder 4 misfire

Required Sensors/Components (Main)

Crank position sensor

Cam position sensor

Required Sensors/Components (Related)

Engine coolant temperature

Intake air temperature sensor

Mass air flow meter sub-assembly

Frequency of Operation

Continuous

Duration

1000 crankshaft revolutions (soon after engine is started: 1 time, other 4 times) (Emission-related misfire)

200 crankshaft revolutions (1 or 3 times) (Catalyst-damaging misfire)

MIL Operation

2 driving cycles: Emission-related misfire

MIL flashes immediate: Catalyst-damaging misfire

Sequence of Operation

None

TYPICAL ENABLING CONDITIONS

Misfire

Monitor runs whenever the following DTCs are not stored

P0016 (VVT system - misalignment)

P0017 (Exhaust VVT system - misalignment)

P0102, P0103 (Mass air flow meter)

P0107, P0108 (Manifold absolute pressure)

P0112, P0113 (Intake air temperature sensor)

P0115, P0117, P0118 (Engine coolant temperature sensor)

P0120, P0121, P0122, P0123, P0220, P0222, P0223, P2135 (Throttle position sensor)

P0125 (Insufficient coolant temperature for closed loop fuel control)

P0327, P0328 (Knock control sensor)

P0335 (Crank position sensor)

P0340 (Cam position sensor)

P0500 (Vehicle speed sensor)

Battery voltage

8 V or higher

VVT system

Not operated by scan tool

Engine speed

  • 425 to 6400 rpm (for CVT models)
  • 500 to 6400 rpm (for Manual Transaxle models)

Either of the following conditions is met

(a) or (b)

(a) Engine coolant temperature at engine start

Higher than -7°C (19°F)

(b) Engine coolant temperature

Higher than 20°C (68°F)

Fuel cut

Off

Monitor Period of Emission-related Misfire

First 1000 revolutions after engine start, or during check mode

Crankshaft 1000 revolutions

Except above

Crankshaft 1000 revolutions x 4

Monitor Period of Catalyst-damaging Misfire (MIL Blinks)

All of the following conditions 1, 2 and 3 are met

Crankshaft 200 revolutions

Except above (MIL blinks immediately)

Crankshaft 200 revolutions x 3

1. Driving cycles

1st

2. Check mode

Off

3. Engine speed

  • Less than 2550 rpm (for CVT models)
  • Less than 2950 rpm (for Manual Transaxle models)

TYPICAL MALFUNCTION THRESHOLDS

Monitor Period of Emission-related Misfire

Misfire rate

2% or higher

Monitor Period of Catalyst-damaging Misfire (MIL Blinks)

Number of misfires per 200 revolutions

97 or more (varies with intake air amount and engine speed)

MONITOR RESULT

Refer to detailed information in Checking Monitor Status.

Click here 2020 - 2023 MY Corolla [01/2019 - 11/2022]; 2ZR-FAE (ENGINE CONTROL): SFI SYSTEM: CHECKING MONITOR STATUS

P0300: Misfire / EWMA MISFIRE

Monitor ID

Test ID

Scaling

Unit

Description

$A1

$0B

Multiply by 1

Count

Total EWMA* misfire count of all cylinders in last ten driving cycles

P0300: Misfire / MISFIRE RATE

Monitor ID

Test ID

Scaling

Unit

Description

$A1

$0C

Multiply by 1

Count

  • When ignition switch ON, total misfire count of all cylinders in last driving cycle is displayed.
  • While engine is running, total misfire count of all cylinders in current driving cycle is displayed.

P0301: Misfire / EWMA MISFIRE1

Monitor ID

Test ID

Scaling

Unit

Description

$A2

$0B

Multiply by 1

Count

Total EWMA* misfire count of cylinder 1 in last ten driving cycles

P0301: Misfire / MISFIRE RATE1

Monitor ID

Test ID

Scaling

Unit

Description

$A2

$0C

Multiply by 1

Count

  • When ignition switch ON, total misfire count of cylinder 1 in last driving cycle is displayed.
  • While engine is running, total misfire count of cylinder 1 in current driving cycle is displayed.

P0302: Misfire / EWMA MISFIRE2

Monitor ID

Test ID

Scaling

Unit

Description

$A3

$0B

Multiply by 1

Count

Total EWMA* misfire count of cylinder 2 in last ten driving cycles

P0302: Misfire / MISFIRE RATE2

Monitor ID

Test ID

Scaling

Unit

Description

$A3

$0C

Multiply by 1

Count

  • When ignition switch ON, total misfire count of cylinder 2 in last driving cycle is displayed.
  • While engine is running, total misfire count of cylinder 2 in current driving cycle is displayed.

P0303: Misfire / EWMA MISFIRE3

Monitor ID

Test ID

Scaling

Unit

Description

$A4

$0B

Multiply by 1

Count

Total EWMA* misfire count of cylinder 3 in last ten driving cycles

P0303: Misfire / MISFIRE RATE3

Monitor ID

Test ID

Scaling

Unit

Description

$A4

$0C

Multiply by 1

Count

  • When ignition switch ON, total misfire count of cylinder 3 in last driving cycle is displayed.
  • While engine is running, total misfire count of cylinder 3 in current driving cycle is displayed.

P0304: Misfire / EWMA MISFIRE4

Monitor ID

Test ID

Scaling

Unit

Description

$A5

$0B

Multiply by 1

Count

Total EWMA* misfire count of cylinder 4 in last ten driving cycles

P0304: Misfire / MISFIRE RATE4

Monitor ID

Test ID

Scaling

Unit

Description

$A5

$0C

Multiply by 1

Count

  • When ignition switch ON, total misfire count of cylinder 4 in last driving cycle is displayed.
  • While engine is running, total misfire count of cylinder 4 in current driving cycle is displayed.

HINT:

*: EWMA (Exponential Weighted Moving Average) misfire counts for last 10 driving cycles (calculated) Calculation: 0.1 x (current counts) + 0.9 x (previous average)

Initial value for (previous average) = 0

CONFIRMATION DRIVING PATTERN

  1. Connect the Techstream to the DLC3.
  2. Turn the ignition switch to ON.
  3. Turn the Techstream on.
  4. Record the DTC(s) and Freeze Frame Data.
  5. Clear the DTCs (even if no DTCs are stored, perform the clear DTC procedure).
  6. Switch the ECM from normal mode to check mode.

    Click here 2020 - 2023 MY Corolla [01/2019 - 11/2022]; 2ZR-FAE (ENGINE CONTROL): SFI SYSTEM: CHECK MODE PROCEDURE

  7. Read the misfire count of each cylinder (Cylinder #1 Misfire Count to Cylinder #4 Misfire Count), with the engine idling. If any misfire count is displayed, skip the following confirmation driving pattern.
  8. Drive the vehicle so that the vehicle conditions displayed in Misfire RPM and Misfire Load of the Data List are the same as the Freeze Frame Data. Perform this step several times.

    HINT:

    In order to store misfire DTCs, it is necessary to operate the vehicle for the period of time shown in the table below, using the Misfire RPM and Misfire Load in the Data List.

    Engine Speed (rpm)

    Duration

    Idling

    8.0 minutes or more

    1000

    4.5 minutes or more

    2000

    2.5 minutes or more

    3000

    1.5 minutes or more

  9. Check whether misfires have occurred by checking for DTCs and Freeze Frame Data.

    HINT:

    Do not turn the ignition switch off until the stored DTC(s) and Freeze Frame Data have been recorded. When the ECM returns to normal mode (default), the stored DTC(s), Freeze Frame Data and other data will be cleared.

  10. Record the DTC(s), Freeze Frame Data and misfire counts.
  11. Clear the DTCs (even if no DTCs are stored, perform the clear DTC procedure).
  12. Turn the ignition switch off and wait for at least 30 seconds.

WIRING DIAGRAM

  • Refer to DTC P0102 for the mass air flow meter sub-assembly circuit.

    Click here 2020 MY Corolla [01/2019 - 03/2019]; 2ZR-FAE (ENGINE CONTROL): SFI SYSTEM: P0102,P0103; Mass Air Flow Circuit Low+

  • Refer to Fuel Injector Circuit.

    Click here 2020 - 2023 MY Corolla [01/2019 - 11/2022]; 2ZR-FAE (ENGINE CONTROL): SFI SYSTEM: Fuel Injector Circuit+

CAUTION / NOTICE / HINT

NOTICE:

Inspect the fuses for circuits related to this system before performing the following procedure.

HINT:

  • Check the "Fuel Cut Elps Time" in the Data List or the Freeze Frame Data.

    If the elapsed time is over 0 seconds, then the engine speed is high (engine speed at which fuel cut occurs + 500 rpm).

    When this has happened, there is the possibility that the No. 1 valve rocker arm sub-assembly will become loose and a fire could start, so check that the No. 1 valve rocker arm sub-assembly is properly attached.

    Click here 2020 - 2023 MY Corolla [01/2019 - 11/2022]; 2ZR-FAE (ENGINE MECHANICAL): CAMSHAFT: COMPONENTS

  • By clearing the DTCs, "Fuel Cut Elps Time" will be cleared.
  • In the past, when the primary ignition system (the igniter drive circuit in the ECM, the primary circuit in the No. 1 ignition coil, the related wire harness, or the connector) was out of order, diagnostic codes from P0351 to P0354 were output. However, these codes are not output in this vehicle.

    When a failure in the primary ignition system is suspected, refer to "Cat OT MF F/C History", "Cat OT MF F/C Cylinder #1 to #4", and "Cylinder #1 Misfire Count to Cylinder #4 Misfire Count" in the Freeze Frame Data, the pending Freeze Frame Data, and the Data List, and confirm in which cylinder the high-frequency misfire was concentrated.

  • Referring to the following contents of the Freeze Frame Data (or the pending Freeze Frame Data) enables an estimation of which cylinder has misfired and to what degree.
    • Cylinder #1 Misfire Count to Cylinder #4 Misfire Count: Misfire count according to cylinder.
    • Cat OT MF F/C Cylinder #1 to #4: This expresses a high-frequency misfire was concentrated in a certain cylinder and that cylinder's fuel injection was stopped.
  • If any DTCs other than misfire DTCs are output, troubleshoot those DTCs first.
  • If the misfire does not recur when the vehicle is brought to the workshop, reproduce the conditions stored in the ECM as Freeze Frame Data.
  • If the misfire still cannot be reproduced even though the conditions stored in the ECM as Freeze Frame Data have been reproduced, the following factors can be considered to be a possible cause of the problem:
    1. There was insufficient fuel in the tank.
    2. Improper fuel was used.
    3. The spark plugs have been contaminated.
    4. The problem requires further diagnosis.
  • After finishing repairs, check the misfire counts of the cylinders (Cylinder #1 Misfire Count to Cylinder #4 Misfire Count).
  • Be sure to confirm that no misfiring cylinder DTCs are stored again by conducting the confirmation driving pattern after finishing repairs.
  • When one of Short FT B1S1 or Long FT B1S1 in the Freeze Frame Data is outside the range of +/-15%, the air fuel ratio may be rich (-15% or less) or lean (15% or higher).
  • When Coolant Temp in the Freeze Frame Data is less than 75°C (167°F), the misfires have occurred only while warming up the engine.
  • An extremely imbalanced drive wheel which causes body vibration may cause misfire DTCs to be stored.
  • Read Freeze Frame Data using the Techstream. The ECM records vehicle and driving condition information as Freeze Frame Data the moment a DTC is stored. When troubleshooting, Freeze Frame Data can help determine if the vehicle was moving or stationary, if the engine was warmed up or not, if the air fuel ratio was lean or rich, and other data from the time the malfunction occurred.

PROCEDURE

1.

CHECK ANY OTHER DTCS OUTPUT (IN ADDITION TO MISFIRE DTCS)

(a) Connect the Techstream to the DLC3.

(b) Turn the ignition switch to ON.

(c) Turn the Techstream on.

(d) Enter the following menus: Powertrain / Engine and ECT / Trouble Codes.

(e) Read the DTCs.

Powertrain > Engine and ECT > Trouble Codes

Result

Proceed to

DTC P0300, P0301, P0302, P0303 and/or P0304 are output

A

DTC P0300, P0301, P0302, P0303 and/or P0304 and other DTCs are output

B

HINT:

If any DTCs other than P0300, P0301, P0302, P0303 or P0304 are output, troubleshoot those DTCs first.

B

GO TO DTC CHART

A

2.

CHECK PCV HOSE CONNECTIONS

(a) Check the PCV hose connections.

Click here 2020 - 2023 MY Corolla [01/2019 - 11/2022]; 2ZR-FAE (EMISSION CONTROL): PCV VALVE: COMPONENTS

OK:

PCV valve and hose are correctly connected and are not damaged.

NG

REPAIR OR REPLACE PCV HOSE

OK

3.

READ VALUE USING TECHSTREAM (MISFIRE RPM AND MISFIRE LOAD)

(a) Connect the Techstream to the DLC3.

(b) Turn the ignition switch to ON.

(c) Turn the Techstream on.

(d) Enter the following menus: Powertrain / Engine and ECT / Data List / Misfire RPM and Misfire Load.

Powertrain > Engine and ECT > Data List

Tester Display

Misfire RPM

Misfire Load

(e) Read and note the Misfire RPM and Misfire Load values.

HINT:

The Misfire RPM and Misfire Load values indicate the vehicle conditions under which the misfire occurred.

NEXT

4.

READ VALUE USING TECHSTREAM (CATALYST OT MF F/C)

(a) Enter the following menus: Powertrain / Engine and ECT / Data List / Catalyst OT MF F/C.

Powertrain > Engine and ECT > Data List

Tester Display

Catalyst OT MF F/C

(b) Read the value displayed on the Techstream.

Data List

Result

Proceed to

Catalyst OT MF F/C

Avail

A

Not Avl

B

B

GO TO STEP 6

A

5.

PERFORM ACTIVE TEST USING TECHSTREAM (PROHIBIT THE CATALYST OT MISFIRE PREVENT F/C)

(a) Connect the Techstream to the DLC3.

(b) Turn the ignition switch to ON.

(c) Turn the Techstream on.

(d) Enter the following menus: Powertrain / Engine and ECT / Active Test / Prohibit the Catalyst OT Misfire prevent F/C.

Powertrain > Engine and ECT > Active Test

Tester Display

Prohibit the Catalyst OT Misfire prevent F/C

(e) Perform the Active Test.

NOTICE:

When performing the Active Test, make sure the vehicle is stopped and the engine is either idling or being revved within 3000 rpm.

NEXT

6.

READ VALUE USING TECHSTREAM (CYLINDER #1 (TO #4) MISFIRE COUNT)

(a) Enter the following menus: Powertrain / Engine and ECT / Data List / Cylinder #1 Misfire Count, Cylinder #2 Misfire Count, Cylinder #3 Misfire Count and Cylinder #4 Misfire Count.

Powertrain > Engine and ECT > Data List

Tester Display

Cylinder #1 Misfire Count

Cylinder #2 Misfire Count

Cylinder #3 Misfire Count

Cylinder #4 Misfire Count

(b) Start the engine and allow the engine to idle.

(c) Read each value for Cylinder #1 Misfire Count to Cylinder #4 Misfire Count displayed on the Techstream. If no misfire counts occur in any cylinders, perform procedure [A] and [B] and then check the misfire counts again.

(1) Drive the vehicle with the Misfire RPM and Misfire Load noted in the read value using the Techstream (Misfire RPM and Misfire Load) procedures above [A].

(2) Read Cylinder #1 (to #4) Misfire Count or the DTCs displayed on the Techstream [B].

Result

Proceed to

Most misfires occur in only 1 or 2 cylinders

A

3 cylinders or more have equal misfire counts

B

HINT:

  • If it is difficult to reproduce misfires for each cylinder, check the Data List item called Misfire Margin. Try to find vehicle driving conditions that lower the Misfire Margin value. Values above 30% are considered normal.
  • If the Freeze Frame Data record of the engine coolant temperature is less than 75°C (167°F), it may only be possible to detect the misfire when the engine is cold.
  • If the Freeze Frame Data record of the Engine Run Time is below 120 seconds, the misfire may be detected immediately after the engine is started.
B

GO TO STEP 17

A

7.

INSPECT SPARK PLUG

(a) Inspect the spark plug of the misfiring cylinder.

Click here 2020 - 2023 MY Corolla [01/2019 - 11/2022]; 2ZR-FAE (ENGINE CONTROL): IGNITION SYSTEM: ON-VEHICLE INSPECTION+

HINT:

Perform "Inspection After Repair" after replacing the spark plug.

Click here 2020 - 2023 MY Corolla [01/2019 - 11/2022]; 2ZR-FAE (ENGINE CONTROL): SFI SYSTEM: INITIALIZATION

NG

REPLACE SPARK PLUG

OK

8.

CHECK FOR SPARKS (SPARK TEST)

(a) Perform a spark test.

Click here 2020 - 2023 MY Corolla [01/2019 - 11/2022]; 2ZR-FAE (ENGINE CONTROL): IGNITION SYSTEM: ON-VEHICLE INSPECTION+

HINT:

  • If the result of the spark test is normal, proceed to the next step.
  • Perform "Inspection After Repair" after repairing or replacing the ignition system.

    Click here 2020 - 2023 MY Corolla [01/2019 - 11/2022]; 2ZR-FAE (ENGINE CONTROL): SFI SYSTEM: INITIALIZATION

NEXT

9.

CHECK CYLINDER COMPRESSION PRESSURE

(a) Measure the cylinder compression pressure of the misfiring cylinder.

Click here 2020 - 2023 MY Corolla [01/2019 - 11/2022]; 2ZR-FAE (ENGINE MECHANICAL): ENGINE: ON-VEHICLE INSPECTION+

HINT:

Perform "Inspection After Repair" after repairing or replacing the engine assembly.

Click here 2020 - 2023 MY Corolla [01/2019 - 11/2022]; 2ZR-FAE (ENGINE CONTROL): SFI SYSTEM: INITIALIZATION

NG

CHECK ENGINE TO DETERMINE CAUSE OF LOW COMPRESSION

OK

10.

CHECK TERMINAL VOLTAGE (#10, #20, #30 AND/OR #40)

*a

Front view of wire harness connector

(to ECM)

(a) Disconnect the ECM connector.

(b) Turn the ignition switch to ON.

(c) Measure the voltage according to the value(s) in the table below.

Standard Voltage:

Tester Connection

Condition

Specified Condition

C77-98 (#10) - C77-57 (E01)

Ignition switch ON

11 to 14 V

C77-95 (#20) - C77-57 (E01)

Ignition switch ON

11 to 14 V

C77-96 (#30) - C77-57 (E01)

Ignition switch ON

11 to 14 V

C77-97 (#40) - C77-57 (E01)

Ignition switch ON

11 to 14 V

NG

GO TO FUEL INJECTOR CIRCUIT

OK

11.

CHECK FUEL INJECTOR ASSEMBLY OF MISFIRING CYLINDER

(a) Check the fuel injector assembly injection (whether fuel volume is high or low, and whether injection pattern is poor).

Click here 2020 - 2023 MY Corolla [01/2019 - 11/2022]; 2ZR-FAE (FUEL): FUEL INJECTOR: INSPECTION

HINT:

Perform "Inspection After Repair" after replacing the fuel injector assembly.

Click here 2020 - 2023 MY Corolla [01/2019 - 11/2022]; 2ZR-FAE (ENGINE CONTROL): SFI SYSTEM: INITIALIZATION

NG

REPLACE FUEL INJECTOR ASSEMBLY

OK

12.

CHECK INTAKE SYSTEM

(a) Check the intake system for vacuum leaks.

Click here 2020 - 2023 MY Corolla [01/2019 - 11/2022]; 2ZR-FAE (INTAKE / EXHAUST): INTAKE SYSTEM: ON-VEHICLE INSPECTION

OK:

No leaks from intake system.

HINT:

Perform "Inspection After Repair" after repairing or replacing the intake system.

Click here 2020 - 2023 MY Corolla [01/2019 - 11/2022]; 2ZR-FAE (ENGINE CONTROL): SFI SYSTEM: INITIALIZATION

NG

REPAIR OR REPLACE INTAKE SYSTEM

OK

13.

CHECK FUEL PRESSURE

(a) Check the fuel pressure.

Click here 2020 - 2022 MY Corolla [01/2019 - 09/2022]; 2ZR-FAE (FUEL): FUEL SYSTEM: ON-VEHICLE INSPECTION+

NG

REPLACE ENGINE COOLANT TEMPERATURE SENSOR

OK

14.

READ VALUE USING TECHSTREAM (COOLANT TEMP)

(a) Connect the Techstream to the DLC3.

(b) Turn the ignition switch to ON.

(c) Turn the Techstream on.

(d) Enter the following menus: Powertrain / Engine and ECT / Data List / Coolant Temp.

Powertrain > Engine and ECT > Data List

Tester Display

Coolant Temp

(e) Read the Data List twice, when the engine is both cold and warmed up.

Standard:

Techstream Display

Condition

Specified Condition

Coolant Temp

Cold engine

Same as ambient air temperature

Warm engine

Between 75 and 100°C (167 and 212°F)

HINT:

Perform "Inspection After Repair" after replacing the engine coolant temperature sensor.

Click here 2020 - 2023 MY Corolla [01/2019 - 11/2022]; 2ZR-FAE (ENGINE CONTROL): SFI SYSTEM: INITIALIZATION

NG

REPLACE ENGINE COOLANT TEMPERATURE SENSOR

OK

15.

READ VALUE USING TECHSTREAM (MAF)

(a) Connect the Techstream to the DLC3.

(b) Start the engine.

(c) Turn the Techstream on.

(d) Enter the following menus: Powertrain / Engine and ECT / Data List / MAF, Coolant Temp and Engine Speed.

Powertrain > Engine and ECT > Data List

Tester Display

Engine Speed

MAF

Coolant Temp

(e) Allow the engine to idle until Coolant Temp reaches 75°C (167°F) or higher.

(f) Read MAF with the engine speed at 3000 rpm.

Standard:

Techstream Display

Condition

Specified Condition

MAF

  • Engine warmed up
  • Shift lever position: N (neutral)
  • A/C: Off
  • Engine Speed: 3000 rpm

Between 5.0 and 10.0 gm/sec

NG

GO TO STEP 30

OK

16.

CHECK VALVE TIMING (CHECK FOR LOOSE TIMING CHAIN AND JUMPED TEETH)

(a) Remove the cylinder head cover sub-assembly.

Click here 2020 MY Corolla [01/2019 - 03/2019]; 2ZR-FAE (ENGINE MECHANICAL): ENGINE UNIT: DISASSEMBLY+

(b) Turn the crankshaft pulley and align its groove with the "0" timing mark of the timing chain or belt cover sub-assembly.

(c) Check that the timing marks of the camshaft timing gear assembly and camshaft timing exhaust gear assembly are at the positions shown in the illustration.

*a

39.5°

*b

Timing Mark

*c

"0" Timing Mark

*d

Groove

HINT:

If the timing marks are not as shown, turn the crankshaft one revolution clockwise.

OK:

Timing marks on camshaft timing gear assembly and camshaft timing exhaust gear assembly are at the positions shown in the illustration.

HINT:

If the result is not as specified, check for mechanical malfunctions that may have affected the valve timing, such as a jumped tooth or stretching of the timing chain.

OK

GO TO STEP 30

NG

GO TO STEP 27

17.

CHECK INTAKE SYSTEM

(a) Check the intake system for vacuum leaks.

Click here 2020 - 2023 MY Corolla [01/2019 - 11/2022]; 2ZR-FAE (INTAKE / EXHAUST): INTAKE SYSTEM: ON-VEHICLE INSPECTION

OK:

No leaks from intake system.

HINT:

Perform "Inspection After Repair" after repairing or replacing the intake system.

Click here 2020 - 2023 MY Corolla [01/2019 - 11/2022]; 2ZR-FAE (ENGINE CONTROL): SFI SYSTEM: INITIALIZATION

NG

REPAIR OR REPLACE INTAKE SYSTEM

OK

18.

CHECK FUEL PRESSURE

(a) Check the fuel pressure.

Click here 2020 - 2022 MY Corolla [01/2019 - 09/2022]; 2ZR-FAE (FUEL): FUEL SYSTEM: ON-VEHICLE INSPECTION+

NG

GO TO STEP 37

OK

19.

READ VALUE USING TECHSTREAM (COOLANT TEMP)

(a) Connect the Techstream to the DLC3.

(b) Turn the ignition switch to ON.

(c) Turn the Techstream on.

(d) Enter the following menus: Powertrain / Engine and ECT / Data List / Coolant Temp.

Powertrain > Engine and ECT > Data List

Tester Display

Coolant Temp

(e) Read the Data List twice, when the engine is both cold and warmed up.

Standard:

Techstream Display

Condition

Specified Condition

Coolant Temp

Cold engine

Same as ambient air temperature

Warm engine

Between 75 and 100°C (167 and 212°F)

HINT:

Perform "Inspection After Repair" after replacing the engine coolant temperature sensor.

Click here 2020 - 2023 MY Corolla [01/2019 - 11/2022]; 2ZR-FAE (ENGINE CONTROL): SFI SYSTEM: INITIALIZATION

NG

REPLACE ENGINE COOLANT TEMPERATURE SENSOR

OK

20.

READ VALUE USING TECHSTREAM (MAF)

(a) Connect the Techstream to the DLC3.

(b) Start the engine.

(c) Turn the Techstream on.

(d) Enter the following menus: Powertrain / Engine and ECT / Data List / MAF, Coolant Temp and Engine Speed.

Powertrain > Engine and ECT > Data List

Tester Display

Engine Speed

MAF

Coolant Temp

(e) Allow the engine to idle until Coolant Temp reaches 75°C (167°F) or higher.

(f) Read MAF with the engine speed at 3000 rpm.

Standard:

Techstream Display

Condition

Specified Condition

MAF

  • Engine warmed up
  • Shift lever position: N (neutral)
  • A/C: Off
  • Engine Speed: 3000 rpm

Between 5.0 and 10.0 gm/sec

NG

GO TO STEP 30

OK

21.

CHECK VALVE TIMING (CHECK FOR LOOSE TIMING CHAIN AND JUMPED TEETH)

(a) Remove the cylinder head cover sub-assembly.

Click here 2020 MY Corolla [01/2019 - 03/2019]; 2ZR-FAE (ENGINE MECHANICAL): ENGINE UNIT: DISASSEMBLY+

(b) Turn the crankshaft pulley and align its groove with the "0" timing mark of the timing chain or belt cover sub-assembly.

(c) Check that the timing marks of the camshaft timing gear assembly and camshaft timing exhaust gear assembly are at the positions shown in the illustration.

*a

39.5°

*b

Timing Mark

*c

"0" Timing Mark

*d

Groove

HINT:

If the timing marks are not as shown, turn the crankshaft one revolution clockwise.

OK:

Timing marks on camshaft timing gear assembly and camshaft timing exhaust gear assembly are at the positions shown in the illustration.

HINT:

If the result is not as specified, check for mechanical malfunctions that may have affected the valve timing, such as a jumped tooth or stretching of the timing chain.

NG

GO TO STEP 27

OK

22.

INSPECT SPARK PLUG

(a) Inspect the spark plug of the misfiring cylinder.

Click here 2020 - 2023 MY Corolla [01/2019 - 11/2022]; 2ZR-FAE (ENGINE CONTROL): IGNITION SYSTEM: ON-VEHICLE INSPECTION+

HINT:

Perform "Inspection After Repair" after replacing the spark plug.

Click here 2020 - 2023 MY Corolla [01/2019 - 11/2022]; 2ZR-FAE (ENGINE CONTROL): SFI SYSTEM: INITIALIZATION

NG

REPLACE SPARK PLUG

OK

23.

CHECK FOR SPARKS (SPARK TEST)

(a) Perform a spark test.

Click here 2020 - 2023 MY Corolla [01/2019 - 11/2022]; 2ZR-FAE (ENGINE CONTROL): IGNITION SYSTEM: ON-VEHICLE INSPECTION+

HINT:

  • If the result of the spark test is normal, proceed to the next step.
  • Perform "Inspection After Repair" after repairing or replacing the ignition system.

    Click here 2020 - 2023 MY Corolla [01/2019 - 11/2022]; 2ZR-FAE (ENGINE CONTROL): SFI SYSTEM: INITIALIZATION

NEXT

24.

CHECK CYLINDER COMPRESSION PRESSURE

(a) Measure the cylinder compression pressure of the misfiring cylinder.

Click here 2020 - 2023 MY Corolla [01/2019 - 11/2022]; 2ZR-FAE (ENGINE MECHANICAL): ENGINE: ON-VEHICLE INSPECTION+

HINT:

Perform "Inspection After Repair" after repairing or replacing the engine assembly.

Click here 2020 - 2023 MY Corolla [01/2019 - 11/2022]; 2ZR-FAE (ENGINE CONTROL): SFI SYSTEM: INITIALIZATION

NG

CHECK ENGINE TO DETERMINE CAUSE OF LOW COMPRESSION

OK

25.

CHECK TERMINAL VOLTAGE (#10, #20, #30 AND/OR #40)

*a

Front view of wire harness connector

(to ECM)

(a) Disconnect the ECM connector.

(b) Turn the ignition switch to ON.

(c) Measure the voltage according to the value(s) in the table below.

Standard Voltage:

Tester Connection

Condition

Specified Condition

C77-98 (#10) - C77-57 (E01)

Ignition switch ON

11 to 14 V

C77-95 (#20) - C77-57 (E01)

Ignition switch ON

11 to 14 V

C77-96 (#30) - C77-57 (E01)

Ignition switch ON

11 to 14 V

C77-97 (#40) - C77-57 (E01)

Ignition switch ON

11 to 14 V

NG

GO TO FUEL INJECTOR CIRCUIT

OK

26.

CHECK FUEL INJECTOR ASSEMBLY

(a) Check the fuel injector assembly injection (whether fuel volume is high or low, and whether injection pattern is poor).

Click here 2020 - 2023 MY Corolla [01/2019 - 11/2022]; 2ZR-FAE (FUEL): FUEL INJECTOR: INSPECTION

HINT:

Perform "Inspection After Repair" after replacing the fuel injector assembly.

Click here 2020 - 2023 MY Corolla [01/2019 - 11/2022]; 2ZR-FAE (ENGINE CONTROL): SFI SYSTEM: INITIALIZATION

OK

GO TO STEP 30

NG

REPLACE FUEL INJECTOR ASSEMBLY

27.

CHECK ENGINE MECHANICAL SYSTEM

(a) Check for mechanical malfunctions that affect the valve timing, such as a jumped tooth or stretching of the timing chain.

HINT:

Perform "Inspection After Repair" after repairing or replacing the engine mechanical system.

Click here 2020 - 2023 MY Corolla [01/2019 - 11/2022]; 2ZR-FAE (ENGINE CONTROL): SFI SYSTEM: INITIALIZATION

NG

REPAIR OR REPLACE MALFUNCTIONING PARTS, COMPONENT AND AREA

OK

28.

CLEAR DTC

(a) Connect the Techstream to the DLC3.

(b) Turn the ignition switch to ON.

(c) Turn the Techstream on.

(d) Clear the DTCs.

Powertrain > Engine and ECT > Clear DTCs

(e) Turn the ignition switch off and wait for at least 30 seconds.

NEXT

29.

CHECK WHETHER DTC OUTPUT RECURS (MISFIRE DTCS)

(a) Drive the vehicle in accordance with the driving pattern described in Confirmation Driving Pattern.

(b) Enter the following menus: Powertrain / Engine and ECT / Utility / All Readiness.

Powertrain > Engine and ECT > Utility

Tester Display

All Readiness

(c) Input the DTC: P0300, P0301, P0302, P0303 or P0304.

(d) Check the DTC judgment result.

Result

Proceed to

NORMAL

(DTCs are not output)

A

ABNORMAL

(DTC P0300, P0301, P0302, P0303 or P0304 is output)

B

A

CHECK FOR INTERMITTENT PROBLEMS

B

30.

CHECK HARNESS AND CONNECTOR (MASS AIR FLOW METER SUB-ASSEMBLY CONNECTOR CONNECTION)

(a) Check the connection and terminal contact pressure of connectors and wire harnesses between the mass air flow meter sub-assembly and ECM.

Click here 2019 - 2025 MY Corolla Corolla Hatchback Corolla HV GR Corolla [06/2018 -        ]; INTRODUCTION: HOW TO TROUBLESHOOT ECU CONTROLLED SYSTEMS: ELECTRONIC CIRCUIT INSPECTION PROCEDURE

HINT:

Repair any problems.

NEXT

31.

CLEAR DTC

(a) Connect the Techstream to the DLC3.

(b) Turn the ignition switch to ON.

(c) Turn the Techstream on.

(d) Clear the DTCs.

Powertrain > Engine and ECT > Clear DTCs

(e) Turn the ignition switch off and wait for at least 30 seconds.

NEXT

32.

CHECK WHETHER DTC OUTPUT RECURS (MISFIRE DTCS)

(a) Drive the vehicle in accordance with the driving pattern described in Confirmation Driving Pattern.

(b) Enter the following menus: Powertrain / Engine and ECT / Utility / All Readiness.

Powertrain > Engine and ECT > Utility

Tester Display

All Readiness

(c) Input the DTC: P0300, P0301, P0302, P0303 or P0304.

(d) Check the DTC judgment result.

Result

Proceed to

NORMAL

(DTCs are not output)

A

ABNORMAL

(DTC P0300, P0301, P0302, P0303 or P0304 is output)

B

A

END

B

33.

CHECK HARNESS AND CONNECTOR (MASS AIR FLOW METER SUB-ASSEMBLY - ECM)

(a) Disconnect the mass air flow meter sub-assembly connector.

(b) Disconnect the ECM connector.

(c) Measure the resistance according to the value(s) in the table below.

Standard Resistance:

Tester Connection

Condition

Specified Condition

C26-1 (FG) - C77-137 (VG)

Always

Below 1 Ω

C26-2 (E2G) - C77-104 (E2G)

Always

Below 1 Ω

C26-3 (VCC) - C77-103 (VCVG)

Always

Below 1 Ω

C26-1 (FG) or C77-137 (VG) - Body ground and other terminals

Always

10 kΩ or higher

C26-3 (VCC) or C77-103 (VCVG) - Body ground and other terminals

Always

10 kΩ or higher

NG

REPAIR OR REPLACE HARNESS OR CONNECTOR

OK

34.

REPLACE MASS AIR FLOW METER SUB-ASSEMBLY

(a) Replace the mass air flow meter sub-assembly.

Click here 2020 - 2023 MY Corolla [01/2019 - 11/2022]; 2ZR-FAE (ENGINE CONTROL): MASS AIR FLOW METER: REMOVAL

HINT:

  • If the results of the inspections performed in steps 15 and 20 (READ VALUE USING TECHSTREAM (MAF)) indicated no problem, proceed to the next step without replacing the mass air flow meter sub-assembly.
  • Perform "Inspection After Repair" after replacing the mass air flow meter sub-assembly.

    Click here 2020 - 2023 MY Corolla [01/2019 - 11/2022]; 2ZR-FAE (ENGINE CONTROL): SFI SYSTEM: INITIALIZATION

NEXT

35.

CLEAR DTC

(a) Connect the Techstream to the DLC3.

(b) Turn the ignition switch to ON.

(c) Turn the Techstream on.

(d) Clear the DTCs.

Powertrain > Engine and ECT > Clear DTCs

(e) Turn the ignition switch off and wait for at least 30 seconds.

NEXT

36.

CHECK WHETHER DTC OUTPUT RECURS (MISFIRE DTCS)

(a) Drive the vehicle in accordance with the driving pattern described in Confirmation Driving Pattern.

(b) Enter the following menus: Powertrain / Engine and ECT / Utility / All Readiness.

Powertrain > Engine and ECT > Utility

Tester Display

All Readiness

(c) Input the DTC: P0300, P0301, P0302, P0303 or P0304.

(d) Check the DTC judgment result.

Result

Proceed to

NORMAL

(DTCs are not output)

A

ABNORMAL

(DTC P0300, P0301, P0302, P0303 or P0304 is output)

B

A

END

B

REPLACE ECM

37.

INSPECT FUEL PUMP

(a) Inspect the fuel pump.

Click here 2020 - 2023 MY Corolla [01/2019 - 11/2022]; 2ZR-FAE (FUEL): FUEL PUMP (w/ Canister Pump Module): INSPECTION

HINT:

Perform "Inspection After Repair" after replacing the fuel pump.

Click here 2020 - 2023 MY Corolla [01/2019 - 11/2022]; 2ZR-FAE (ENGINE CONTROL): SFI SYSTEM: INITIALIZATION

OK

REPAIR OR REPLACE FUEL LINE

NG

REPLACE FUEL PUMP