Last Modified: 05-13-2024 6.11:8.1.0 Doc ID: RM100000001GJ6B
Model Year Start: 2020 Model: Corolla Prod Date Range: [01/2019 - 04/2020]
Title: 2ZR-FXE (ENGINE CONTROL): SFI SYSTEM: P042000; Catalyst System Efficiency Below Threshold Bank 1; 2020 MY Corolla Corolla HV [01/2019 - 04/2020]

DTC

P042000

Catalyst System Efficiency Below Threshold Bank 1

MONITOR DESCRIPTION

The ECM uses sensors mounted in front of and behind the Three-Way Catalytic Converter (TWC) to monitor its efficiency.

The first sensor, the air fuel ratio sensor, sends pre-catalyst information to the ECM. The second sensor, the heated oxygen sensor, sends post-catalyst information to the ECM.

In order to detect any deterioration in the three-way catalytic converter, the ECM calculates the oxygen storage capacity of the three-way catalytic converter. This calculation is based on the output voltage of the heated oxygen sensor while performing active air fuel ratio control.

The oxygen storage capacity value is an indication of the oxygen storage capacity of the three-way catalytic converter. When the vehicle is being driven with a warm engine, active air fuel ratio control is performed for approximately 30 seconds. When it is performed, the ECM deliberately sets the air fuel ratio to lean or rich levels. If the cycle of the waveform for the heated oxygen sensor is long, the oxygen storage capacity is great. There is a direct correlation between the heated oxygen sensor and the oxygen storage capacity of the three-way catalytic converter.

The ECM uses the oxygen storage capacity value to determine the state of the three-way catalytic converter. If any deterioration has occurred, the ECM will illuminate the MIL and store a DTC.

This system determines the deterioration of the entire catalyst system (including the front and rear catalysts), by using the oxygen storage capacity value of the front catalyst, that is more sensitive than the rear catalyst, as the representative value. Therefore, be sure to replace the front and rear catalysts together when catalyst replacement is necessary.

DTC No.

Detection Item

DTC Detection Condition

Trouble Area

MIL

Memory

Note

P042000

Catalyst System Efficiency Below Threshold Bank 1

The oxygen storage capacity value is less than the standard value under active air fuel ratio control (1 trip detection logic: except Mexico models, 2 trip detection logic: for Mexico models).

  • Gas leak from exhaust system
  • Air fuel ratio sensor (sensor 1)
  • Heated oxygen sensor (sensor 2)
  • Exhaust manifold (TWC: Front catalyst)
  • Front exhaust pipe assembly (TWC: Rear catalyst)
  • EGR valve assembly

Comes on

DTC stored

  • SAE Code: P0420
  • DTC for Mexico Models: Applies

CATALYST LOCATION

*1

Air Fuel Ratio Sensor (Sensor 1)

*2

Heated Oxygen Sensor (Sensor 2)

*3

Exhaust Manifold

*4

Front Exhaust Pipe Assembly

*5

Tail Exhaust Pipe Assembly

*6

TWC: Front Catalyst

*7

TWC: Rear Catalyst

-

-

NOTICE:

When replacing the exhaust manifold (*3) and the front exhaust pipe assembly (*4) in order to replace the three-way catalytic converter, it is not necessary to replace the air fuel ratio sensor (*1) and the heated oxygen sensor (*2).

MONITOR STRATEGY

Related DTCs

P0420: Catalyst deterioration

Required Sensors/Components (Main)

Air fuel ratio sensor

Heated oxygen sensor

Required Sensors/Components (Related)

Intake air temperature sensor

Mass air flow meter sub-assembly

Crankshaft position sensor

Engine coolant temperature sensor

Frequency of Operation

Once per driving cycle

Duration

Approximately 30 seconds

MIL Operation

2 driving cycles: for Mexico models

Immediate: Except for Mexico models

Sequence of Operation

None

TYPICAL ENABLING CONDITIONS

Monitor runs whenever the following DTCs are not stored

P0010 (Camshaft timing oil control valve)

P0011 (VVT system - advance)

P0012 (VVT system - retard)

P0016 (VVT system - misalignment)

P0031, P0032, P101D (Air fuel ratio sensor heater)

P0037, P0038, P0141, P102D (Heated oxygen sensor heater)

P0101, P0102, P0103 (Mass air flow meter)

P0106, P0107, P0108 (Manifold absolute pressure)

P0111, P0112, P0113 (Intake air temperature sensor)

P0116, P0117, P0118 (Engine coolant temperature sensor)

P011B (Engine coolant temperature/intake air temperature sensor correlation)

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

P0125 (Insufficient coolant temperature for closed loop fuel control)

P0128 (Thermostat)

P0136, P0137, P0138, P0139, P013A, P0607 (Heated oxygen sensor)

P014C, P014D, P015A, P015B, P2195, P2196, P2237, P2238, P2239, P2252, P2253 (Air fuel ratio sensor)

P0171, P0172 (Fuel system)

P0300 - P0304 (Misfire)

P0327, P0328 (Knock control sensor)

P0335 (Crankshaft position sensor)

P0340, P0342, P0343 (Camshaft position sensor)

P0351 - P0354 (Igniter)

P0400 (EGR system)

P0401 (EGR system (closed))

P0403 (EGR control circuit)

P0657, P0658, P2102, P2103, P2111, P2112, P2119 (Throttle actuator)

P219A, P219C, P219D, P219E, P219F (Air-fuel ratio imbalance)

P2228, P2229 (Atmospheric pressure sensor)

Response rate during fuel cut from rich condition

Completed

Auxiliary battery voltage

11 V or higher

Intake air temperature

-10°C (14°F) or higher

Engine coolant temperature

75°C (167°F) or higher

Atmospheric pressure

76 kPa(abs) [11 psi(abs)] or higher

Idling

Off

Engine speed

Less than 4500 rpm

Air fuel ratio sensor status

Activated

Fuel system status

Closed loop

Engine load

10% or higher, and less than 80%

All of the following conditions are met

1, 2 and 3

1. Mass air flow

2.5 gm/sec or more, and less than 50 gm/sec

2. Front catalyst temperature (estimated)

450°C (842°F) or higher, and less than 770°C (1418°F)

3. Rear catalyst temperature (estimated)

330°C (626°F) or higher, and less than 700°C (1292°F)

Air fuel ratio imbalance of clogged EGR runner fail (P10AA)

Not set

TYPICAL MALFUNCTION THRESHOLDS

Except for Mexico Models

Oxygen Storage Capacity (OSC) of catalyst (Normalized)

Less than 1

for Mexico Models

Oxygen Storage Capacity (OSC) of catalyst

Less than 0.07 g

MONITOR RESULT

Refer to detailed information in Checking Monitor Status.

Click here 2020 - 2025 MY Corolla Corolla HV [01/2019 -        ]; 2ZR-FXE (ENGINE CONTROL): SFI SYSTEM: CHECKING MONITOR STATUS

P0420: Catalyst Efficiency / O2 STORAGE B1

Monitor ID

Test ID

Scaling

Unit

Description

$21

$AF

Multiply by 0.001

No dimension

Oxygen storage capacity of catalyst bank 1 (Normalization)

CONFIRMATION DRIVING PATTERN

HINT:

  • It is necessary for the response of the heated oxygen sensor to be normal in order to confirm DTC P042000. Therefore, perform the confirmation driving pattern for the heated oxygen sensor monitor before performing the confirmation driving pattern for the catalyst efficiency monitor.
  • Performing this confirmation driving pattern will activate the catalyst efficiency monitor. This is very useful for verifying the completion of a repair.
  • After repair has been completed, clear the DTC and then check that the vehicle has returned to normal by performing the following All Readiness check procedure.

    Click here 2020 - 2022 MY Corolla Corolla HV [01/2019 - 09/2022]; 2ZR-FXE (ENGINE CONTROL): SFI SYSTEM: DTC CHECK / CLEAR

  • When clearing the permanent DTCs, refer to the "CLEAR PERMANENT DTC" procedure.

    Click here 2020 - 2022 MY Corolla Corolla HV [01/2019 - 09/2022]; 2ZR-FXE (ENGINE CONTROL): SFI SYSTEM: DTC CHECK / CLEAR

  1. Connect the Techstream to the DLC3.
  2. Turn the power switch on (IG).
  3. Turn the Techstream on.
  4. Clear the DTCs (even if no DTCs are stored, perform the clear DTC procedure).
  5. Turn the power switch off and wait for at least 30 seconds.
  6. Turn the power switch on (IG).
  7. Turn the Techstream on.
  8. Enter the following menus: Powertrain / Engine / Monitor / Current Monitor.
  9. Check that Catalyst Efficiency / Current is Incomplete.
  10. Put the engine in Inspection Mode (Maintenance Mode).

    Click here 2019 - 2025 MY Corolla Corolla Hatchback Corolla HV GR Corolla [06/2018 -        ]; INTRODUCTION: REPAIR INSTRUCTION: INSPECTION MODE PROCEDURE

  11. Start the engine and warm it up until the engine coolant temperature is 75°C (167°F) or higher with park (P) selected [A].

    HINT:

    In order to keep the idle stable, turn the A/C and all other electric loads off and do not perform any shift operations.

  12. With the engine running, drive the vehicle at approximately 75 km/h (47 mph) for 10 minutes or more [B].

    CAUTION:

    When performing the confirmation driving pattern, obey all speed limits and traffic laws.

    HINT:

    • Drive the vehicle while keeping the engine load as constant as possible.
    • If the engine stops, further depress the accelerator pedal to restart the engine.
  13. With shift state B selected and the engine running, drive the vehicle at 75 km/h (47 mph), and then decelerate the vehicle by releasing the accelerator pedal for 5 seconds or more to perform the fuel-cut [C].

    CAUTION:

    When performing the confirmation driving pattern, obey all speed limits and traffic laws.

    HINT:

    If the engine stops, further depress the accelerator pedal to restart the engine.

  14. Enter the following menus: Powertrain / Engine / Monitor / Current Monitor / O2 Sensor / RL F/C B1S2 [D].
  15. Check the Test Value for RL F/C B1S2.

    HINT:

    • If Test Value displays a value larger than 0, perform the following procedure, as the O2 Sensor monitor is finished.
    • If Test Value displays 0, perform step [C] until it displays a value larger than 0, as the O2 Sensor monitor is not finished.
  16. Turn the power switch off and wait for at least 30 seconds [F].
  17. Turn the power switch on (IG).
  18. Turn the Techstream on.
  19. Start the engine and warm it up until the engine coolant temperature is 75°C (167°F) or higher [G].
  20. With the engine running, drive the vehicle at approximately 75 km/h (47 mph) for 10 minutes or more [H].

    CAUTION:

    When performing the confirmation driving pattern, obey all speed limits and traffic laws.

    HINT:

    • Drive the vehicle while keeping the engine load as constant as possible.
    • The monitor item will change to Complete as the Catalyst Efficiency monitor operates.
    • If the engine stops, further depress the accelerator pedal to restart the engine.
  21. Enter the following menus: Powertrain / Engine / Trouble Codes [I].
  22. Check if any DTCs are stored.

    HINT:

    • If the monitor item does not change to Complete, and no DTCs are stored, perform the following procedure.
    • [A] to [I]: Normal judgment procedure.

      The normal judgment procedure is used to complete DTC judgment and also used when clearing permanent DTCs.

    • When clearing the permanent DTCs, do not disconnect the cable from the auxiliary battery terminal or attempt to clear the DTCs during this procedure, as doing so will clear the universal trip and normal judgment histories.
  23. With the engine running, drive the vehicle at approximately 100 km/h (62 mph) for 10 minutes or more [J].

    CAUTION:

    When performing the confirmation driving pattern, obey all speed limits and traffic laws.

    HINT:

    • Drive the vehicle while keeping the engine load as constant as possible.
    • The monitor item will change to Complete as the Catalyst Efficiency monitor operates.
    • If the engine stops, further depress the accelerator pedal to restart the engine.
  24. Enter the following menus: Powertrain / Engine / Trouble Codes [K].
  25. Check if any DTCs are stored.

    HINT:

    If the monitor item does not change to Complete, and no DTCs are stored, extend the driving time.

  26. Enter the following menus: Powertrain / Engine / Utility / All Readiness.
  27. Input the DTC: P042000.
  28. Check the DTC judgment result.

    Techstream Display

    Description

    NORMAL

    • DTC judgment completed
    • System normal

    ABNORMAL

    • DTC judgment completed
    • System abnormal

    INCOMPLETE

    • DTC judgment not completed
    • Perform driving pattern after confirming DTC enabling conditions

    HINT:

    • If the judgment result is NORMAL, the system is normal.
    • If the judgment result is ABNORMAL, the system has a malfunction.
    • [A] to [K]: Normal judgment procedure.

      The normal judgment procedure is used to complete DTC judgment and also used when clearing permanent DTCs.

    • When clearing the permanent DTCs, do not disconnect the cable from the auxiliary battery terminal or attempt to clear the DTCs during this procedure, as doing so will clear the universal trip and normal judgment histories.

CONDITIONING FOR SENSOR TESTING

HINT:

Perform the operation with the engine speeds and time durations described below prior to checking the waveforms of the air fuel ratio and heated oxygen sensors. This is to activate the sensors sufficiently to obtain appropriate inspection results.

  1. Connect the Techstream to the DLC3.
  2. Turn the power switch on (IG).
  3. Turn the Techstream on.
  4. Put the engine in Inspection Mode (Maintenance Mode).

    Click here 2019 - 2025 MY Corolla Corolla Hatchback Corolla HV GR Corolla [06/2018 -        ]; INTRODUCTION: REPAIR INSTRUCTION: INSPECTION MODE PROCEDURE

  5. Start the engine and warm it up with the A/C switch and all accessories off until the engine coolant temperature stabilizes [A].
  6. Enter the following menus: Powertrain / Engine / Data List / A/F (O2) Sensor Voltage B1S1 and O2 Sensor Voltage B1S2.
  7. Run the engine at an engine speed of 2500 rpm for at least 3 minutes [B].

    HINT:

    During charge control, the engine speed is set at idle. Therefore, the engine speed will not increase when the accelerator pedal is depressed. In this case, perform step [B] after charge control has completed.

  8. While running the engine at 2500 rpm and 1500 rpm for 2 seconds, check the waveform of the air fuel ratio sensor and heated oxygen sensor using the Techstream [C].

HINT:

  • If the output voltage of either the air fuel ratio sensor or heated oxygen sensor does not fluctuate, or there is a noise in the waveform of either sensor, the sensor may be malfunctioning.
  • If the voltage outputs of both the sensors remain lean or rich, the air fuel ratio may be extremely lean or rich. In such a case, perform the Active Test "Control the Injection Volume for A/F Sensor" using the Techstream.
  • If the Three-way Catalytic Converter (TWC) has deteriorated, the heated oxygen sensor (located behind the Three-way Catalytic Converter [TWC]) output voltage fluctuates up and down frequently, even under normal driving conditions (active air fuel ratio control is not performed).

CAUTION / NOTICE / HINT

HINT:

  • If a malfunction cannot be found when troubleshooting DTC P042000, a lean or rich abnormality may be the cause. Perform troubleshooting by following the inspection procedure for P017100 (System Too Lean) and P017200 (System Too Rich).
  • Sensor 1 refers to the sensor closest to the engine assembly.
  • Sensor 2 refers to the sensor farthest away from the engine assembly.
  • 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 DTC P042000)

(a) Connect the Techstream to the DLC3.

(b) Turn the power switch on (IG).

(c) Turn the Techstream on.

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

(e) Read the DTCs.

Powertrain > Engine > Trouble Codes

Result

Proceed to

DTC P042000 is output

A

DTC P042000 and other DTCs are output

B

HINT:

If any DTCs other than P042000 are output, troubleshoot those DTCs first.

B

GO TO DTC CHART

A

2.

PERFORM ACTIVE TEST USING TECHSTREAM (CONTROL THE INJECTION VOLUME FOR A/F SENSOR)

(a) Connect the Techstream to the DLC3.

(b) Turn the power switch on (IG).

(c) Turn the Techstream on.

(d) Put the engine in Inspection Mode (Maintenance Mode).

Click here 2019 - 2025 MY Corolla Corolla Hatchback Corolla HV GR Corolla [06/2018 -        ]; INTRODUCTION: REPAIR INSTRUCTION: INSPECTION MODE PROCEDURE

Powertrain > Hybrid Control > Utility

Tester Display

Inspection Mode

(e) Start the engine and warm it up until the engine coolant temperature is 75°C (167°F) or higher.

(f) Idle the engine for 5 minutes or more with park (P) selected.

(g) Enter the following menus: Powertrain / Engine / Active Test / Control the Injection Volume for A/F Sensor / Data List / A/F (O2) Sensor Voltage B1S1 and O2 Sensor Voltage B1S2.

Powertrain > Engine > Active Test

Active Test Display

Control the Injection Volume for A/F Sensor

Data List Display

A/F (O2) Sensor Voltage B1S1

O2 Sensor Voltage B1S2

(h) Change the fuel injection volume using the Techstream, and monitor the output voltage of the air fuel ratio sensor (A/F (O2) Sensor Voltage B1S1) and heated oxygen sensor (O2 Sensor Voltage B1S2) displayed on the Techstream.

HINT:

  • The Active Test "Control the Injection Volume for A/F Sensor" can be used to lower the fuel injection volume by 12.5% or increase the injection volume by 12.5%.
  • The air fuel ratio sensor is displayed as A/F (O2) Sensor Voltage B1S1, and the heated oxygen sensor is displayed as O2 Sensor Voltage B1S2 on the Techstream.
  • The air fuel ratio sensor has an output delay of a few seconds and the heated oxygen sensor has a maximum output delay of approximately 20 seconds.
  • If the sensor output voltage does not change (almost no reaction) while performing the Active Test, the sensor may be malfunctioning.

Standard:

Techstream Display

(Sensor)

Injection Volume

Status

Voltage

A/F (O2) Sensor Voltage B1S1

(Air fuel ratio)

12.5%

Rich

Below 3.1 V

-12.5%

Lean

Higher than 3.4 V

O2 Sensor Voltage B1S2

(Heated oxygen)

12.5%

Rich

Higher than 0.55 V

-12.5%

Lean

Below 0.4 V

Status A/F (O2) Sensor Voltage B1S1

Status O2 Sensor Voltage B1S2

Actual air fuel ratio, air fuel ratio sensor and heated oxygen sensor condition

Main Suspected Trouble Area

Proceed to

Lean/Rich

Lean/Rich

Normal

  • Three-way catalytic converter
  • Gas leak from exhaust system
  • EGR valve assembly

A

Lean

Lean/Rich

Air fuel ratio sensor malfunction

  • Air fuel ratio sensor

B

Rich

Lean/Rich

Air fuel ratio sensor malfunction

  • Air fuel ratio sensor

Lean/Rich

Lean

Heated oxygen sensor malfunction

  • Heated oxygen sensor
  • Gas leak from exhaust system

C

Lean/Rich

Rich

Heated oxygen sensor malfunction

  • Heated oxygen sensor
  • Gas leak from exhaust system

Lean

Lean

Actual air fuel ratio lean

  • Extremely lean actual air fuel ratio
  • Gas leak from exhaust system
  • EGR valve assembly

D

Rich

Rich

Actual air fuel ratio rich

  • Extremely rich actual air fuel ratio
  • Gas leak from exhaust system
  • EGR valve assembly
  • Lean: While performing the Active Test "Control the Injection Volume for A/F Sensor", the air fuel ratio sensor output voltage (A/F (O2) Sensor Voltage B1S1) is consistently higher than 3.4 V, and the heated oxygen sensor output voltage (O2 Sensor Voltage B1S2) is consistently below 0.4 V.
  • Rich: While performing the Active Test "Control the Injection Volume for A/F Sensor", the air fuel ratio sensor output voltage (A/F (O2) Sensor Voltage B1S1) is consistently below 3.1 V, and the heated oxygen sensor output voltage (O2 Sensor Voltage B1S2) is consistently higher than 0.55 V.
  • Lean/Rich: While performing the Active Test "Control the Injection Volume for A/F Sensor", the output voltage of the fuel ratio sensor (A/F (O2) Sensor Voltage B1S1) or heated oxygen sensor (O2 Sensor Voltage B1S2) alternates correctly.
B

GO TO STEP 6

C

GO TO STEP 7

D

GO TO STEP 9

A

3.

CHECK FOR EXHAUST GAS LEAK

(a) Check for exhaust gas leaks.

OK:

No gas leaks in exhaust system.

NG

GO TO STEP 13

OK

4.

PERFORM ACTIVE TEST USING TECHSTREAM (CONTROL THE EGR STEP POSITION)

(a) Connect the Techstream to the DLC3.

(b) Turn the power switch on (IG).

(c) Turn the Techstream on.

(d) Put the engine in Inspection Mode (Maintenance Mode).

Click here 2019 - 2025 MY Corolla Corolla Hatchback Corolla HV GR Corolla [06/2018 -        ]; INTRODUCTION: REPAIR INSTRUCTION: INSPECTION MODE PROCEDURE

Powertrain > Hybrid Control > Utility

Tester Display

Inspection Mode

(e) Start the engine and warm it up until the engine coolant temperature is 75°C (167°F) or higher.

HINT:

The A/C switch and all accessories should be off.

(f) Enter the following menus: Powertrain / Engine / Active Test / Control the EGR Step Position / Data List / Intake Manifold Absolute Pressure and Engine Independent.

Powertrain > Engine > Active Test

Active Test Display

Control the EGR Step Position

Data List Display

Intake Manifold Absolute Pressure

Engine Independent

(g) Confirm that the value of Data List item Engine Independent is "Operate" then check the value of Intake Manifold Absolute Pressure while performing the Active Test.

NOTICE:

  • Do not leave the EGR valve open for 10 seconds or more during the Active Test.
  • Be sure to return the EGR valve to step 0 when the Active Test is completed.
  • Do not open the EGR valve 30 steps or more during the Active Test.

OK:

The value of Intake Manifold Absolute Pressure changes in response to the EGR step position when the value of Engine Independent is "Operate".

Standard:

-

Control the EGR Step Position (Active Test)

0 Steps

0 to 30 Steps

Intake Manifold Absolute Pressure

(Data List)

(EGR valve is fully closed)

Intake Manifold Absolute Pressure value is at least +10 kPa (1.45 psi) higher than when EGR valve is fully closed

HINT:

  • If the value of Data List item Engine Independent is "Not Opr" when the engine is idling, charge control is being performed. Perform the Active Test after charge control is complete ("Operate" is displayed).
  • While performing the Active Test, if the increase in the value of Intake Manifold Absolute Pressure is small, the EGR valve assembly may be malfunctioning.
  • Even if the EGR valve assembly is malfunctioning, rough idling or an increase in the value of Intake Manifold Absolute Pressure may occur while performing the Active Test. However, the amount that the value of Intake Manifold Absolute Pressure increases will be smaller than normal.
OK

GO TO STEP 16

NG

5.

INSPECT EGR VALVE ASSEMBLY

(a) Remove the EGR valve assembly.

Click here 2020 MY Corolla Corolla HV [01/2019 - 04/2020]; 2ZR-FXE (EMISSION CONTROL): EGR VALVE: REMOVAL

(b) Check if the EGR valve is stuck open.

OK:

EGR valve is tightly closed.

HINT:

Perform "Inspection After Repair" after replacing the EGR valve assembly.

Click here 2020 - 2022 MY Corolla Corolla HV [01/2019 - 09/2022]; 2ZR-FXE (ENGINE CONTROL): SFI SYSTEM: INITIALIZATION

OK

GO TO STEP 16

NG

REPLACE EGR VALVE ASSEMBLY

6.

REPLACE AIR FUEL RATIO SENSOR

(a) Replace the air fuel ratio sensor.

Click here 2020 - 2025 MY Corolla Corolla HV [01/2019 -        ]; 2ZR-FXE (ENGINE CONTROL): AIR FUEL RATIO SENSOR: REMOVAL

HINT:

Perform "Inspection After Repair" after replacing the air fuel ratio sensor.

Click here 2020 - 2022 MY Corolla Corolla HV [01/2019 - 09/2022]; 2ZR-FXE (ENGINE CONTROL): SFI SYSTEM: INITIALIZATION

NEXT

GO TO STEP 14

7.

CHECK FOR EXHAUST GAS LEAK

(a) Check for exhaust gas leaks.

OK:

No gas leaks in exhaust system.

NG

GO TO STEP 13

OK

8.

REPLACE HEATED OXYGEN SENSOR

(a) Replace the heated oxygen sensor.

Click here 2020 - 2025 MY Corolla Corolla HV [01/2019 -        ]; 2ZR-FXE (ENGINE CONTROL): HEATED OXYGEN SENSOR: REMOVAL

HINT:

Perform "Inspection After Repair" after replacing the heated oxygen sensor.

Click here 2020 - 2022 MY Corolla Corolla HV [01/2019 - 09/2022]; 2ZR-FXE (ENGINE CONTROL): SFI SYSTEM: INITIALIZATION

NEXT

GO TO STEP 14

9.

CHECK FOR EXHAUST GAS LEAK

(a) Check for exhaust gas leaks.

OK:

No gas leaks in exhaust system.

NG

GO TO STEP 13

OK

10.

PERFORM ACTIVE TEST USING TECHSTREAM (CONTROL THE EGR STEP POSITION)

(a) Connect the Techstream to the DLC3.

(b) Turn the power switch on (IG).

(c) Turn the Techstream on.

(d) Put the engine in Inspection Mode (Maintenance Mode).

Click here 2019 - 2025 MY Corolla Corolla Hatchback Corolla HV GR Corolla [06/2018 -        ]; INTRODUCTION: REPAIR INSTRUCTION: INSPECTION MODE PROCEDURE

Powertrain > Hybrid Control > Utility

Tester Display

Inspection Mode

(e) Start the engine and warm it up until the engine coolant temperature is 75°C (167°F) or higher.

HINT:

The A/C switch and all accessories should be off.

(f) Enter the following menus: Powertrain / Engine / Active Test / Control the EGR Step Position / Data List / Intake Manifold Absolute Pressure and Engine Independent.

Powertrain > Engine > Active Test

Active Test Display

Control the EGR Step Position

Data List Display

Intake Manifold Absolute Pressure

Engine Independent

(g) Confirm that the value of Data List item Engine Independent is "Operate" then check the value of Intake Manifold Absolute Pressure while performing the Active Test.

NOTICE:

  • Do not leave the EGR valve open for 10 seconds or more during the Active Test.
  • Be sure to return the EGR valve to step 0 when the Active Test is completed.
  • Do not open the EGR valve 30 steps or more during the Active Test.

OK:

The value of Intake Manifold Absolute Pressure changes in response to the EGR step position when the value of Engine Independent is "Operate".

Standard:

-

Control the EGR Step Position (Active Test)

0 Steps

0 to 30 Steps

Intake Manifold Absolute Pressure

(Data List)

(EGR valve is fully closed)

Intake Manifold Absolute Pressure value is at least +10 kPa (1.45 psi) higher than when EGR valve is fully closed

HINT:

  • If the value of Data List item Engine Independent is "Not Opr" when the engine is idling, charge control is being performed. Perform the Active Test after charge control is complete ("Operate" is displayed).
  • While performing the Active Test, if the increase in the value of Intake Manifold Absolute Pressure is small, the EGR valve assembly may be malfunctioning.
  • Even if the EGR valve assembly is malfunctioning, rough idling or an increase in the value of Intake Manifold Absolute Pressure may occur while performing the Active Test. However, the amount that the value of Intake Manifold Absolute Pressure increases will be smaller than normal.
OK

GO TO STEP 12

NG

11.

INSPECT EGR VALVE ASSEMBLY

(a) Remove the EGR valve assembly.

Click here 2020 MY Corolla Corolla HV [01/2019 - 04/2020]; 2ZR-FXE (EMISSION CONTROL): EGR VALVE: REMOVAL

(b) Check if the EGR valve is stuck open.

OK:

EGR valve is tightly closed.

HINT:

Perform "Inspection After Repair" after replacing the EGR valve assembly.

Click here 2020 - 2022 MY Corolla Corolla HV [01/2019 - 09/2022]; 2ZR-FXE (ENGINE CONTROL): SFI SYSTEM: INITIALIZATION

NG

REPLACE EGR VALVE ASSEMBLY

OK

12.

CHECK CAUSE OF EXTREMELY RICH OR LEAN ACTUAL AIR FUEL RATIO

(a) Check the cause of extremely rich or lean actual air fuel ratio, referring to the DTC P017100 and P017200 Inspection Procedure.

Click here 2020 MY Corolla Corolla HV [01/2019 - 04/2020]; 2ZR-FXE (ENGINE CONTROL): SFI SYSTEM: P017100,P017200; System Too Lean Bank 1

NEXT

GO TO STEP 14

13.

REPAIR OR REPLACE EXHAUST SYSTEM

(a) Repair or replace exhaust system.

HINT:

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

Click here 2020 - 2022 MY Corolla Corolla HV [01/2019 - 09/2022]; 2ZR-FXE (ENGINE CONTROL): SFI SYSTEM: INITIALIZATION

NEXT

14.

CLEAR DTC

(a) Connect the Techstream to the DLC3.

(b) Turn the power switch on (IG).

(c) Turn the Techstream on.

(d) Clear the DTCs.

Powertrain > Engine > Clear DTCs

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

NEXT

15.

CONFIRM WHETHER MALFUNCTION HAS BEEN SUCCESSFULLY REPAIRED

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

(b) Enter the following menus: Powertrain / Engine / Trouble Codes.

(c) Read the DTCs.

Powertrain > Engine > Trouble Codes

Result

Proceed to

DTCs are not output

A

DTC P042000 is output

B

A

END

B

16.

REPLACE EXHAUST MANIFOLD (TWC: FRONT CATALYST) AND FRONT EXHAUST PIPE ASSEMBLY (TWC: REAR CATALYST)

NOTICE:

When replacing the exhaust manifold and the front exhaust pipe assembly in order to replace the three-way catalytic converter, it is not necessary to replace the air fuel ratio sensor and the heated oxygen sensor.

HINT:

Confirm the replacement parts, referring to the illustration in the Catalyst Location.

(a) Replace the exhaust manifold (TWC: Front catalyst).

Click here 2020 - 2022 MY Corolla Corolla HV [01/2019 - 09/2022]; 2ZR-FXE (INTAKE / EXHAUST): EXHAUST MANIFOLD: COMPONENTS

(b) Replace the front exhaust pipe assembly (TWC: Rear catalyst).

Click here 2020 - 2025 MY Corolla Corolla HV [01/2019 -        ]; 2ZR-FXE (INTAKE / EXHAUST): EXHAUST PIPE: COMPONENTS

NEXT

END