DTC P0135:00 [MZ-CD 1.6]

id0102g8712500

DTC P0135:00

A/F sensor heater circuit malfunction
DETECTION CONDITION
•  The PCM monitors the A/F sensor heater circuit signal. If the A/F sensor heater temperature exceeds the threshold or is less than the threshold, the PCM determines that there is a malfunction in the A/F sensor heater circuit.
POSSIBLE CAUSE
•  A/F sensor heater connector or terminal malfunction
•  Short to ground in the wiring harness between A/F sensor heater terminal C and PCM terminal 205
•  Short to ground in the wiring harness between A/F sensor heater terminal D and PCM terminal 203
•  Short to power in the wiring harness between A/F sensor heater terminal C and PCM terminal 205
•  Short to power in the wiring harness between A/F sensor heater terminal D and PCM terminal 203
•  A/F sensor heater malfunction
•  PCM connector or terminal malfunction
•  Open circuit in the wiring harness between A/F sensor heater terminal C and PCM terminal 205
•  Open circuit in the wiring harness between A/F sensor heater terminal D and PCM terminal 203
•  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 ON (engine off).
•  Perform the Pending Trouble Code Access Procedure and DTC Reading Procedure.
•  Is the other PENDING CODE/DTC also present?
Yes
Go to the applicable DTC inspection.
(See DTC TABLE [MZ-CD 1.6].)
No
Go to the next step.
4
INSPECT A/F SENSOR HEATER CONNECTOR CONDITION
•  Switch the ignition to off.
•  Disconnect the A/F sensor heater connector.
•  Inspect for poor connection (such as damaged/pulled-out pins, corrosion).
•  Is there any malfunction?
Yes
Repair or replace the connector and/or terminals, then go to Step 10.
No
Go to the next step.
5
INSPECT A/F SENSOR HEATER CONTROL CIRCUIT FOR SHORT TO GROUND
•  Disconnect the A/F sensor heater connector.
•  Inspect for continuity between following terminals (wiring harness-side) and body ground:
―  A/F sensor heater terminal C
―  A/F sensor heater terminal D
•  Is there continuity?
Yes
Repair or replace the wiring harness for a possible short to ground, then go to Step 10.
No
Go to the next step.
6
INSPECT A/F SENSOR HEATER CONTROL CIRCUIT FOR SHORT TO POWER SUPPLY
•  Disconnect the A/F sensor heater connector.
•  Switch the ignition to ON (engine off).
•  Measure the voltage at the following terminals (wiring harness-side):
―  A/F sensor heater terminal C
―  A/F sensor heater terminal D
•  Is there any voltage?
Yes
Repair or replace the wiring harness for a possible short to power supply, then go to Step 10.
No
Go to the next step.
7
INSPECT A/F SENSOR HEATER
•  Inspect the A/F sensor heater.
•  Is there any malfunction.
Yes
Replace the A/F sensor, then go to Step 10.
(See AIR FUEL RATIO (A/F) SENSOR REMOVAL/INSTALLATION [MZ-CD 1.6].)
No
Go to the next step.
8
INSPECT PCM CONNECTOR CONDITION
•  Disconnect the PCM connector.
•  Inspect for poor connection (such as damaged/pulled-out pins, corrosion).
•  Is there any malfunction?
Yes
Repair or replace the connector and/or terminals, then go to Step 10.
No
Go to the next step.
9
INSPECT A/F SENSOR HEATER CONTROL CIRCUIT FOR OPEN CIRCUIT
•  A/F sensor heater and PCM connectors are disconnected.
•  Inspect for continuity between A/F sensor heater and PCM at following wiring harness-side connector:
―  A/F sensor heater terminal C and PCM terminal 205
―  A/F sensor heater terminal D and PCM terminal 203
•  Is there continuity?
Yes
Go to the next step.
No
Repair or replace the wiring harness for a possible open circuit, then go to the next step.
10
VERIFY THAT DTC P0135:00 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.
11
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].)
No
DTC troubleshooting completed.