- DTC judgment completed
- System normal
| Last Modified: 07-31-2024 | 6.11:8.1.0 | Doc ID: RM1000000026EFR |
| Model Year Start: 2023 | Model: Corolla | Prod Date Range: [09/2022 - ] |
| Title: 2ZR-FXE (ENGINE CONTROL): SFI SYSTEM: P042000; Catalyst System Efficiency Below Threshold Bank 1; 2023 - 2025 MY Corolla Corolla HV [09/2022 - ] | ||
|
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). |
|
Comes on |
DTC stored |
|
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, P2A00 (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 |
7 gm/sec or more, and less than 30 gm/sec |
|
2. Front catalyst temperature (estimated) |
520°C (968°F) or higher, and less than 710°C (1310°F) |
|
3. Rear catalyst temperature (estimated) |
330°C (626°F) or higher, and less than 700°C (1292°F) |
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](/t3Portal/stylegraphics/info.gif)
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
-
When clearing the permanent DTCs, refer to the "CLEAR PERMANENT DTC" procedure.
Click here
- Connect the Techstream to the DLC3.
- Turn the power switch on (IG).
- Turn the Techstream on.
- Clear the DTCs (even if no DTCs are stored, perform the clear DTC procedure).
- Turn the power switch off and wait for at least 30 seconds.
- Turn the power switch on (IG).
- Turn the Techstream on.
- Enter the following menus: Powertrain / Engine / Monitor / Current Monitor.
- Check that Catalyst Efficiency / Current is Incomplete.
-
Put the engine in Inspection Mode (Maintenance Mode).
Click here
-
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.
-
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.
-
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.
- Enter the following menus: Powertrain / Engine / Monitor / Current Monitor / O2 Sensor / RL F/C B1S2 [D].
-
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.
- Turn the power switch off and wait for at least 30 seconds [F].
- Turn the power switch on (IG).
- Turn the Techstream on.
- Start the engine and warm it up until the engine coolant temperature is 75°C (167°F) or higher [G].
-
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.
- Enter the following menus: Powertrain / Engine / Trouble Codes [I].
-
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.
-
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.
- Enter the following menus: Powertrain / Engine / Trouble Codes [K].
-
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.
- Enter the following menus: Powertrain / Engine / Utility / All Readiness.
- Input the DTC: P042000.
-
Check the DTC judgment result.
Techstream Display
Description
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.
- Connect the Techstream to the DLC3.
- Turn the power switch on (IG).
- Turn the Techstream on.
-
Put the engine in Inspection Mode (Maintenance Mode).
Click here
- Start the engine and warm it up with the A/C switch and all accessories off until the engine coolant temperature stabilizes [A].
- Enter the following menus: Powertrain / Engine / Data List / A/F (O2) Sensor Current B1S1 and O2 Sensor Voltage B1S2.
-
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.
- 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
NOTICE:
-
Vehicle Control History may be stored in the hybrid vehicle control ECU if the engine is malfunctioning. Certain vehicle condition information is recorded when Vehicle Control History is stored. Reading the vehicle conditions recorded in both the freeze frame data and Vehicle Control History can be useful for troubleshooting.
Click here
(Select Powertrain in Health Check and then check the time stamp data.)
Click here
-
If any "Engine Malfunction" Vehicle Control History item has been stored in the hybrid vehicle control ECU, make sure to clear it. However, as all Vehicle Control History items are cleared simultaneously, if any Vehicle Control History items other than "Engine Malfunction" are stored, make sure to perform any troubleshooting for them before clearing Vehicle Control History.
Click here
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 |
|
|
|
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
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 Current 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 Current 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 Current 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 Current 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 Current B1S1 (Air fuel ratio) |
12.5% |
Rich |
Below -0.075 mA |
|
-12.5% |
Lean |
Higher than 0.037 mA |
|
|
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 Current 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 |
|
A |
|
Lean |
Lean/Rich |
Air fuel ratio sensor malfunction |
|
B |
|
Rich |
Lean/Rich |
Air fuel ratio sensor malfunction |
|
|
|
Lean/Rich |
Lean |
Heated oxygen sensor malfunction |
|
C |
|
Lean/Rich |
Rich |
Heated oxygen sensor malfunction |
|
|
|
Lean |
Lean |
Actual air fuel ratio lean |
|
D |
|
Rich |
Rich |
Actual air fuel ratio rich |
|
- 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 Current B1S1) is consistently higher than 0.037 mA,, 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 Current B1S1) is consistently below -0.075 mA,, 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 Current B1S1) or heated oxygen sensor (O2 Sensor Voltage B1S2) alternates correctly.
| B |
|
| C |
|
| D |
|
|
|
3. |
CHECK FOR EXHAUST GAS LEAK |
(a) Check for exhaust gas leaks.
OK:
No gas leaks in exhaust system.
| NG |
|
|
|
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
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 |
|
|
|
5. |
INSPECT EGR VALVE ASSEMBLY |
(a) Remove the EGR valve assembly.
Click here
(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
| OK |
|
| NG |
|
REPLACE EGR VALVE ASSEMBLY
|
|
6. |
REPLACE AIR FUEL RATIO SENSOR |
(a) Replace the air fuel ratio sensor.
Click here
HINT:
Perform "Inspection After Repair" after replacing the air fuel ratio sensor.
Click here
| NEXT |
|
|
7. |
CHECK FOR EXHAUST GAS LEAK |
(a) Check for exhaust gas leaks.
OK:
No gas leaks in exhaust system.
| NG |
|
|
|
8. |
REPLACE HEATED OXYGEN SENSOR |
(a) Replace the heated oxygen sensor.
Click here
HINT:
Perform "Inspection After Repair" after replacing the heated oxygen sensor.
Click here
| NEXT |
|
|
9. |
CHECK FOR EXHAUST GAS LEAK |
(a) Check for exhaust gas leaks.
OK:
No gas leaks in exhaust system.
| NG |
|
|
|
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
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 |
|
|
|
11. |
INSPECT EGR VALVE ASSEMBLY |
(a) Remove the EGR valve assembly.
Click here
(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
| NG |
|
REPLACE EGR VALVE ASSEMBLY
|
|
|
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
| NEXT |
|
|
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
|
|
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.
|
|
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 |
|
|
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).
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(b) Replace the front exhaust pipe assembly (TWC: Rear catalyst).
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