- 425 to 6400 rpm (for CVT models)
- 500 to 6400 rpm (for Manual Transaxle models)
| Last Modified: 07-31-2024 | 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):
|
|
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):
|
|
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):
|
|
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):
|
|
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):
|
|
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 |
|
|
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 |
|
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](/t3Portal/stylegraphics/info.gif)
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 |
|
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 |
|
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 |
|
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 |
|
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 |
|
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
- Connect the Techstream to the DLC3.
- Turn the ignition switch to ON.
- Turn the Techstream on.
- Record the DTC(s) and Freeze Frame Data.
- Clear the DTCs (even if no DTCs are stored, perform the clear DTC procedure).
-
Switch the ECM from normal mode to check mode.
Click here
- 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.
-
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
-
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.
- Record the DTC(s), Freeze Frame Data and misfire counts.
- Clear the DTCs (even if no DTCs are stored, perform the clear DTC procedure).
- 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
-
Refer to Fuel Injector Circuit.
Click here
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
- 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:
- There was insufficient fuel in the tank.
- Improper fuel was used.
- The spark plugs have been contaminated.
- 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 |
|
|
|
2. |
CHECK PCV HOSE CONNECTIONS |
(a) Check the PCV hose connections.
Click here
OK:
PCV valve and hose are correctly connected and are not damaged.
| NG |
|
REPAIR OR REPLACE PCV HOSE |
|
|
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.
|
|
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 |
|
|
|
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.
|
|
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 |
|
|
|
7. |
INSPECT SPARK PLUG |
(a) Inspect the spark plug of the misfiring cylinder.
Click here
HINT:
Perform "Inspection After Repair" after replacing the spark plug.
Click here
| NG |
|
|
|
8. |
CHECK FOR SPARKS (SPARK TEST) |
(a) Perform a spark test.
Click here
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
|
|
9. |
CHECK CYLINDER COMPRESSION PRESSURE |
(a) Measure the cylinder compression pressure of the misfiring cylinder.
Click here
HINT:
Perform "Inspection After Repair" after repairing or replacing the engine assembly.
Click here
| NG |
|
CHECK ENGINE TO DETERMINE CAUSE OF LOW COMPRESSION |
|
|
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 |
|
|
|
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
HINT:
Perform "Inspection After Repair" after replacing the fuel injector assembly.
Click here
| NG |
|
|
|
12. |
CHECK INTAKE SYSTEM |
(a) Check the intake system for vacuum leaks.
Click here
OK:
No leaks from intake system.
HINT:
Perform "Inspection After Repair" after repairing or replacing the intake system.
Click here
| NG |
|
REPAIR OR REPLACE INTAKE SYSTEM |
|
|
13. |
CHECK FUEL PRESSURE |
(a) Check the fuel pressure.
Click here
| NG |
|
|
|
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
| NG |
|
|
|
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 |
|
Between 5.0 and 10.0 gm/sec |
| NG |
|
|
|
16. |
CHECK VALVE TIMING (CHECK FOR LOOSE TIMING CHAIN AND JUMPED TEETH) |
(a) Remove the cylinder head cover sub-assembly.
Click here
(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 |
|
| NG |
|
|
17. |
CHECK INTAKE SYSTEM |
(a) Check the intake system for vacuum leaks.
Click here
OK:
No leaks from intake system.
HINT:
Perform "Inspection After Repair" after repairing or replacing the intake system.
Click here
| NG |
|
REPAIR OR REPLACE INTAKE SYSTEM |
|
|
18. |
CHECK FUEL PRESSURE |
(a) Check the fuel pressure.
Click here
| NG |
|
|
|
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
| NG |
|
|
|
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 |
|
Between 5.0 and 10.0 gm/sec |
| NG |
|
|
|
21. |
CHECK VALVE TIMING (CHECK FOR LOOSE TIMING CHAIN AND JUMPED TEETH) |
(a) Remove the cylinder head cover sub-assembly.
Click here
(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 |
|
|
|
22. |
INSPECT SPARK PLUG |
(a) Inspect the spark plug of the misfiring cylinder.
Click here
HINT:
Perform "Inspection After Repair" after replacing the spark plug.
Click here
| NG |
|
|
|
23. |
CHECK FOR SPARKS (SPARK TEST) |
(a) Perform a spark test.
Click here
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
|
|
24. |
CHECK CYLINDER COMPRESSION PRESSURE |
(a) Measure the cylinder compression pressure of the misfiring cylinder.
Click here
HINT:
Perform "Inspection After Repair" after repairing or replacing the engine assembly.
Click here
| NG |
|
CHECK ENGINE TO DETERMINE CAUSE OF LOW COMPRESSION |
|
|
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 |
|
|
|
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
HINT:
Perform "Inspection After Repair" after replacing the fuel injector assembly.
Click here
| OK |
|
| NG |
|
|
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
| NG |
|
REPAIR OR REPLACE MALFUNCTIONING PARTS, COMPONENT AND AREA |
|
|
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.
|
|
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 |
|
|
|
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
HINT:
Repair any problems.
|
|
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.
|
|
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 |
|
|
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 |
|
|
34. |
REPLACE MASS AIR FLOW METER SUB-ASSEMBLY |
(a) Replace the mass air flow meter sub-assembly.
Click here
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
|
|
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.
|
|
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 |
|
|
37. |
INSPECT FUEL PUMP |
(a) Inspect the fuel pump.
Click here
HINT:
Perform "Inspection After Repair" after replacing the fuel pump.
Click here
| OK |
|
REPAIR OR REPLACE FUEL LINE |
| NG |
|
|
|