DTC P050B:00

Cold start ignition timing performance problem

DETECTION CONDITION

The PCM monitors actual ignition timing using the CKP sensor with 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 a continuous monitor (cold start emission reduction strategy monitoring).
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 (Mode 2)/Snapshot data is available.
The DTC is stored in the PCM memory.

POSSIBLE CAUSE

Damaged or chipped CKP sensor pulse wheel
CKP sensor malfunction
Damaged or chipped CMP sensor pulse wheel
CMP sensor malfunction
PCM malfunction

DIAGNOSTIC PROCEDURE

STEP	INSPECTION		ACTION
1	IDENTIFY TRIGGER DTC FOR FREEZE FRAME DATA (MODE 2) Perform the Freeze Frame PID Data Access Procedure. (See ON-BOARD DIAGNOSTIC TEST ). Is the P050B:00 on FREEZE FRAME DATA (Mode 2)?	Yes	Go to the next step.
1		No	Go to the troubleshooting procedures for DTC on FREEZE FRAME DATA (Mode 2). (See DTC TABLE ).
2	VERIFY FREEZE FRAME DATA (MODE 2)/SNAPSHOT DATA AND DIAGNOSTIC MONITORING TEST RESULTS HAVE BEEN RECORDED. Have the FREEZE FRAME DATA (Mode 2)/snapshot data and DIAGNOSTIC MONITORING TEST RESULTS (cold start emission reduction strategy monitoring related) been recorded?	Yes	Go to the next step.
2		No	Record the FREEZE FRAME DATA (Mode 2)/snapshot data and DIAGNOSTIC MONITORING TEST RESULTS on the repair order, then go to the next step.
3	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.
3		No	Go to the next step.
4	INSPECT CKP SENSOR AND PULSE WHEEL Visually inspect the CKP sensor and pulse wheel. (See CRANKSHAFT POSITION (CKP) SENSOR INSPECTION ). Is there any damage or chip on the CKP sensor and pulse wheel?	Yes	Repair or replace the malfunctioning part according to the inspection results, then go to Step 8.
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	INSPECT CMP SENSOR AND PULSE WHEEL Visually inspect the CMP sensor and pulse wheel. (See CAMSHAFT POSITION (CMP) SENSOR INSPECTION ). Is there any damage or chip on the CMP sensor and pulse wheel?	Yes	Repair or replace the malfunctioning part according to the inspection results, then go to Step 8.
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 DTC TROUBLESHOOTING COMPLETED Clear the DTC from the PCM memory using the M-MDS. (See AFTER REPAIR PROCEDURE ). Start the engine and warm it up completely. Perform the Pending Trouble Code Access Procedure. (See ON-BOARD DIAGNOSTIC TEST ). Is the PENDING CODE for this DTC present?	Yes	Repeat the inspection from Step 1. If the malfunction recurs, replace the PCM. (See PCM REMOVAL/INSTALLATION ). Go to the next step.
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.