P050B

DTC P050B

Diagnostic Instructions

* Perform the Diagnostic System Check - Vehicle Diagnostic System Check - Vehicle prior to using this diagnostic procedure.
* Strategy Based Diagnosis Strategy Based Diagnosis
* Diagnostic Procedure Instructions Diagnostic Procedure Instructions

DTC Descriptor
DTC P050B
- Ignition Timing Performance

Circuit/System Description

The engine control module (ECM) continuously compares the commanded spark timing to the actual spark timing. The ECM uses the crankshaft position (CKP) sensor and the camshaft position (CMP) sensor in order to calculate the actual spark timing.

Conditions for Running the DTC

* DTCs P0300, P0301, P0302, P0303, P0304, P0335, P0336, P0351, P0352, P0353, and P0354 are not set.
* The engine is operating.
* The engine speed is steady.
* The ignition voltage is between 11-16 volts.
* The DTC runs continuously once the above conditions are met.

Conditions for Setting the DTC

* The ECM detects the difference between the actual spark and the commanded spark is greater than 5 degrees.
* The condition exists for more than 7 seconds.

Action Taken When the DTC Sets

DTC P050B is a Type B DTC.

Conditions for Clearing the DTC

DTC P050B is a Type B DTC.

Reference Information

Description and Operation

Engine Control Module Description Engine Control Module Description

DTC Type Reference

Powertrain Diagnostic Trouble Code (DTC) Type Definitions Powertrain Diagnostic Trouble Code (DTC) Type Definitions

Circuit/System Testing

1. Engine idling, observe the DTC information with a scan tool. Verify that DTCs P0016, P0324, P0325, or P0340 do not fail this ignition cycle.

• If any of the listed DTCs fail this ignition refer to Diagnostic Trouble Code (DTC) List - Vehicle Diagnostic Trouble Code (DTC) List - Vehicle for further diagnosis.

2. Observe the DTC information with a scan tool. Verify that DTC P050B does not set this ignition cycle.

• If DTC P050B set this ignition cycle replace the ECM.

Repair Instructions

Perform the Diagnostic Repair Verification Verification Tests after completing the diagnostic procedure.

Control Module References Control Module References for ECM replacement, setup, and programming