DTC P0425 [MZ-CD 1.6 (Y6) (EURO4 emission level)]

id0102g6222900

DTC P0425

Catalyst exhaust gas temperature sensor signal malfunction
DETECTION CONDITION
•  The PCM monitors the exhaust gas temperature on the catalytic converter using the catalyst exhaust gas temperature sensor. If the PCM detects that the exhaust gas temperature is above 299.96 °C {571.93 °F} for 3 s when the engine coolant temperature is below 24.96 °C {79.93 °F}, the PCM determines that the catalyst exhaust gas temperature signal has a malfunction.
POSSIBLE CAUSE
•  Excessive accumulation of soot in diesel particulate filter
•  Catalyst exhaust gas temperature sensor malfunction
•  DIESEL PARTICULATE FILTERLEARNED VALUE RESET improperly
•  FUEL INJECTOR CALIBRATION CODE improperly
•  PCM malfunction

Diagnostic procedure

STEP

INSPECTION

ACTION
1
VERIFY FREEZE FRAME DATA HAS BEEN RECORDED
•  Has the FREEZE FRAME DATA been recorded?
Yes
Go to the next step.
No
Record the FREEZE FRAME DATA on the repair order, then go to the next step.
2
VERIFY RELATED REPAIR INFORMATION AVAILABILITY
•  Verify related service repair information availability.
•  Is any related repair information available?
Yes
Perform repair or diagnosis according to the available repair information.
•  If the vehicle is not repaired, go to the next step.
No
Go to the next step.
3
VERIFY RELATED PENDING CODE AND/OR DTC
•  Switch the ignition to off, then to ON (engine off).
•  Perform the Pending Trouble Code Access Procedure and DTC Reading Procedure.
•  Is the following PENDING CODE/DTC also present?
―  P0201, P0202, P0203, P0204, P0427, P0428, P1201, P1202, P1203, P1204, P1551, P1552, P1553, P1554
Yes
Go to the applicable DTC inspection.
(See DTC P0201 [MZ-CD 1.6 (Y6) (EURO4 emission level)].)
(See DTC P0202 [MZ-CD 1.6 (Y6) (EURO4 emission level)].)
(See DTC P0203 [MZ-CD 1.6 (Y6) (EURO4 emission level)].)
(See DTC P0204 [MZ-CD 1.6 (Y6) (EURO4 emission level)].)
(See DTC P0427 [MZ-CD 1.6 (Y6) (EURO4 emission level)].)
(See DTC P0428 [MZ-CD 1.6 (Y6) (EURO4 emission level)].)
(See DTC P1201 [MZ-CD 1.6 (Y6) (EURO4 emission level)].)
(See DTC P1202 [MZ-CD 1.6 (Y6) (EURO4 emission level)].)
(See DTC P1203 [MZ-CD 1.6 (Y6) (EURO4 emission level)].)
(See DTC P1204 [MZ-CD 1.6 (Y6) (EURO4 emission level)].)
(See DTC P1551 [MZ-CD 1.6 (Y6) (EURO4 emission level)].)
(See DTC P1552 [MZ-CD 1.6 (Y6) (EURO4 emission level)].)
(See DTC P1553 [MZ-CD 1.6 (Y6) (EURO4 emission level)].)
(See DTC P1554 [MZ-CD 1.6 (Y6) (EURO4 emission level)].)
No
Go to the next step.
4
PERFORM DIESEL PARTICULATE FILTER REGENERATION
•  Cool down the engine.
•  Clear the DTC from the PCM memory using the M-MDS.
Note
•  If the engine misfires or stops during diesel particulate filter regeneration, go to the next step.
•  Perform the DIESEL PARTICULATE FILTER REGENERATION.
•  Run the vehicle under the FREEZE FRAME DATA stored condition.
•  Is the same DTC present?
Yes
Go to the next step.
No
Go to Step 9.
5
PERFORM FUEL INJECTOR CALIBRATION CODE PROGRAM
•  Cool down the engine.
•  Clear the DTC from the PCM memory using the M-MDS.
•  Perform the FUEL INJECTOR CALIBRATION CODE PROGRAM.
Note
•  If the engine misfires or stops during diesel particulate filter regeneration, go to the next step.
•  Perform the DIESEL PARTICULATE FILTER REGENERATION.
•  Run the vehicle under the FREEZE FRAME DATA stored condition.
•  Is the same DTC present?
Yes
Go to the next step.
No
Go to Step 9.
6
PERFORM SIESEL PARTICULATE FILTER LEARNED VALUE RESET
•  Cool down the engine.
•  Clear the DTC from the PCM memory using the M-MDS.
•  Perform the DIESEL PARTICULATE FILTER LEARNED VALUE RESET.
Note
•  If the engine misfires or stops during diesel particulate filter regeneration, go to the next step.
•  Perform the DIESEL PARTICULATE FILTER REGENERATION.
•  Run the vehicle under the FREEZE FRAME DATA stored condition.
•  Is the same DTC present?
Yes
Go to the next step.
No
Go to Step 9.
7
VISUALLY INSPECT DIESEL PARTICULATE FILTER FOR RESTRICT AND DAMAGE
•  Cool down the engine.
•  Remove the catalytic converter.
•  Visually inspect the diesel particulate filter.
•  Is there any restrict or damage?
Yes
Replace the catalytic converter, then go to the next step.
(See EXHAUST SYSTEM REMOVAL/INSTALLATION [MZ-CD 1.6 (Y6)].)
No
Go to the next step.
8
VERIFY THAT DTC P0425 TROUBLESHOOTING IS COMPLETED
•  Make sure to reconnect all disconnected connectors.
•  Clear the DTC from the PCM memory using the M-MDS.
•  Run the vehicle under the FREEZE FRAME DATA stored condition.
•  Is the same DTC present?
Yes
Repeat the inspection from Step 1.
•  If the malfunction recurs, replace the PCM.
Go to the next step.
No
Go to the next step.
9
VERIFY AFTER REPAIR PROCEDURE
•  Perform the after repair procedure.
•  Are any DTCs present?
Yes
Go to the applicable DTC inspection.
(See DTC TABLE [MZ-CD 1.6 (Y6) (EURO4 emission level)].)
No
DTC troubleshooting completed.