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2008 - MX-5 - Engine

DTC P0012 [LF]



DTC P0012

CMP timing over-retarded

DETECTION CONDITION

  • Actual valve timing is over-retarded by 10 ° from the target valve timing for specified period when the oil control valve (OCV) system control is within the feedback range.

    • Monitoring condition
    • Engine coolant temperature is above 63 °C {145.4 °F}

    Diagnostic support note
  • This is a continuous monitor (CCM).

  • The MIL illuminates if the PCM detects the above malfunction condition in two consecutive drive cycles or in one drive cycle while the DTC for the same malfunction has been stored in the PCM.

  • PENDING CODE is available if the PCM detects the above malfunction condition during the first drive cycle.

  • FREEZE FRAME DATA is available.

  • The DTC is stored in the PCM memory.

POSSIBLE CAUSE

  • OCV malfunction

  • Low engine oil pressure

  • Spool valve in the OCV is stuck in retard position.

  • Variable valve timing actuator is stuck in retard position.

  • The following oil runners are clogged or have leakage.

    • Oil runners
    • Between the oil pressure switch and the OCV

    • Between the OCV and the variable valve timing actuator

    • In the variable valve timing actuator

  • Loose timing chain or improper valve timing due to timing chain slippage

  • PCM malfunction


Diagnostic procedure

STEP

INSPECTION

ACTION

1

VERIFY FREEZE FRAME DATA HAS BEEN RECORDED
  • Has 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 Bulletins and/or on-line 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 OR STORED DTCS
  • Is DTC P2088 or P2089 present?

Yes

Go to the appropriate DTC troubleshooting procedure.

(See DTC P2088 [LF] or DTC P2089 [LF].)

No

Go to the next step.

4

VERIFY ENGINE OIL PRESSURE
  • Start the engine.

  • Does the oil pressure warning light illuminate?

Yes

Inspect the engine oil pressure, then go to Step 8.

(See OIL PRESSURE INSPECTION [LF].)

No

Go to the next step.

5

VERIFY TIMING CHAIN INSTALLATION

Yes

Go to the next step.

No

Reinstall the timing chain, then go to Step 8.

6

INSPECT OCV

Yes

Replace the OCV, then go to Step 8.

(See OIL CONTROL VALVE (OCV) REMOVAL/INSTALLATION [LF].)

No

Go to the next step.

7

INSPECT ENGINE OIL RUNNER
  • Inspect the following engine oil runners for clogging or leakage.

    • Between oil pressure switch and OCV

    • Between OCV and variable valve timing actuator

    • In variable valve timing actuator

  • Is there any clogging or leakage?

Yes

Repair or replace the suspected runner, then go to the next step.

No

VARIABLE VALVE TIMING MECHANISM IS NORMAL

NOTE:

  • This DTC is detected by intermittent concern.

  • An intermittent concern might be removed using the cleaning mode of the variable valve timing control function.

Go to the next step.

8

VERIFY TROUBLESHOOTING OF DTC P0012 COMPLETED
  • Make sure to reconnect all disconnected connectors.

  • Clear the DTC from the PCM memory using the M-MDS.

  • Turn the ignition switch off.

  • Start the engine and warm it up completely.

  • Is the PENDING CODE for this DTC present?

Yes

Replace the PCM, then go to the next step.

(See PCM REMOVAL/INSTALLATION [LF].)

No

Go to the next step.

9

VERIFY AFTER REPAIR PROCEDURE

Yes

Go to the applicable DTC inspection.

(See DTC TABLE [LF].)

No

Troubleshooting completed.




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