DTC P050B

Cold start ignition timing performance problem

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 emission reduction strategy monitoring).
The MIL illuminates if the PCM detects 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 (Mode 2/Mode 12) is available.
The DTC is stored in the PCM memory.

POSSIBLE CAUSE

CKP sensor related part malfunction
- Pulse wheel malfunction
- CKP sensor malfunction
CMP sensor related part malfunction
- Pulse wheel malfunction
- CMP sensor malfunction
PCM malfunction

DIAGNOSTIC PROCEDURE

STEP	INSPECTION		ACTION
1	VERIFY FREEZE FRAME DATA (MODE 12) AND DIAGNOSTIC MONITORING TEST RESULTS HAVE BEEN RECORDED Have the FREEZE FRAME DATA (Mode 12) and DIAGNOSTIC MONITORING TEST RESULTS (cold start emission reduction strategy monitoring related) been recorded?	Yes	Go to the next step.
1		No	Record the FREEZE FRAME DATA (Mode 12) and DIAGNOSTIC MONITORING TEST RESULTS on the repair order, then go to the next step.
2	VERIFY RELATED SERVICE BULLETINS AVAILABILITY Verify related Service Bulletins availability. Is any related Service Bulletins available?	Yes	Perform the repair or diagnosis according to the available Service Bulletins. If the vehicle is not repaired, go to the next step.
2		No	Go to the next step.
3	IDENTIFY TRIGGER DTC FOR FREEZE FRAME DATA (MODE 2) Is the DTC P050B on FREEZE FRAME DATA (Mode 2)?	Yes	Go to the next step.
3		No	Go to the troubleshooting procedures for DTC on FREEZE FRAME DATA (Mode 2). (See DTC TABLE ).
4	VISUALLY INSPECT CKP SENSOR AND PULSE WHEEL Visually inspect for the CKP sensor and pulse wheel. Is there any malfunction?	Yes	Replace the malfunctioning parts according to the inspection results, then go to Step 8. (See CRANKSHAFT POSITION (CKP) SENSOR REMOVAL/INSTALLATION ).
4		No	Go to the next step.
5	INSPECT CKP SENSOR Inspect the CKP sensor. (See CRANKSHAFT POSITION (CKP) SENSOR INSPECTION ). Is there any malfunction?	Yes	Replace the CKP sensor, then go to Step 8. (See CRANKSHAFT POSITION (CKP) SENSOR REMOVAL/INSTALLATION ).
5		No	Go to the next step.
6	VISUALLY INSPECT CMP SENSOR AND PULSE WHEEL Visually inspect for the CMP sensor and pulse wheel. Is there any malfunction?	Yes	Replace the malfunctioning parts according to the inspection results, then go to Step 8. (See CAMSHAFT POSITION (CMP) SENSOR REMOVAL/INSTALLATION ).
6		No	Go to the next step.
7	INSPECT CMP SENSOR Inspect the CMP sensor. (See CAMSHAFT POSITION (CMP) SENSOR INSPECTION ). Is there any malfunction?	Yes	Replace the CMP sensor, then go to the next step. (See CAMSHAFT POSITION (CMP) SENSOR REMOVAL/INSTALLATION ).
7		No	Go to the next step.
8	VERIFY TROUBLESHOOTING OF DTC P050B COMPLETED Make sure to reconnect all disconnected connectors. Clear the DTC from the PCM memory using the M-MDS. Perform the KOER self test using the M-MDS. (See KOEO/KOER SELF TEST ). Is the PENDING CODE for this DTC present?	Yes	Replace the PCM, then go to the next step. (See PCM REMOVAL/INSTALLATION ).
8		No	Go to the next step.
9	VERIFY AFTER REPAIR PROCEDURE. Perform the "AFTER REPAIR PROCEDURE". (See AFTER REPAIR PROCEDURE ). Are any DTCs present?	Yes	Go to the applicable DTC inspection. (See DTC TABLE ).
9		No	DTC troubleshooting completed.