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2008 - MX-5 - Engine

DTC P050B [LF]



DTC P050B

Cold start ignition timing performance

DETECTION CONDITION

  • The PCM monitors actual ignition timing using the CKP sensor while electronic spark advance control fast idle correction operating. If the ignition timing is out of specified range, the PCM determines that the ignition timing at cold condition has performance problem.

    Diagnostic support note
  • This is an intermittent monitor (Cold start reduction strategy monitoring).

  • 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.

  • DTC is stored in the PCM memory.

POSSIBLE CAUSE

  • Electronic throttle control system malfunction

  • Throttle valve stuck or blockage

  • Air suction in intake air system

  • PCM malfunction


Diagnostic procedure

STEP

INSPECTION

ACTION

1

VERIFY FREEZE FRAME DATA AND DIAGNOSTIC MONITORING TEST RESULTS HAVE BEEN RECORDED
  • Have FREEZE FRAME DATA and DIAGNOSTIC MONITORING TEST RESULTS (CCM related) been recorded?

Yes

Go to the next step.

No

Record the freeze frame data and diagnostic monitoring test results 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

IDENTIFY TRIGER DTC FOR FREEZE FRAME DATA
  • Is P050B on FREEZE FRAME DATA?

Yes

Go to the next step.

No

Go to troubleshooting procedures for DTC on freeze frame data.

(See DTC TABLE[LF].)

4

VISUALLY INSPECT CKP SENSOR AND PULSE WHEEL
  • Visually inspect for CKP sensor and pulse wheel.

  • Is there any damage or chip on CKP sensor and pulse wheel?

Yes

Replace the suspected part, then go to Step 8.

No

Go to the next step.

5

INSPECT CKP SENSOR

Yes

Go to the next step.

No

Replace the CKP sensor, then go to Step 8.

6

VISUALLY INSPECT CMP SENSOR AND PULSE WHEEL
  • Visually inspect for CMP sensor and pulse wheel.

  • Is there any damage or chip on CMP sensor and pulse wheel?

Yes

Replace the suspected part, then go to Step 8.

No

Go to the next step.

7

INSPECT CMP SENSOR

Yes

Go to the next step.

No

Replace the CMP sensor, then go to the next step.

8

VERIFY TROUBLESHOOTING OF DTC P050B COMPLETED
  • Make sure to reconnect all disconnected connectors.

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

  • Perform the KOER self-test using the M-MDS.

    (See DTC TABLE[LF].)

  • 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 troubleshooting.

(See DTC TABLE[LF].)

No

Troubleshooting completed.




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