P050B

DTC P050B

Diagnostic Instructions

* Perform the Diagnostic System Check - Vehicle (Diagnostic System Check - Vehicle) prior to using this diagnostic procedure.
* Review Strategy Based Diagnosis (Strategy Based Diagnosis) for an overview of the diagnostic approach.
* Diagnostic Procedure Instructions (Diagnostic Procedure Instructions) provides an overview of each diagnostic category.

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 running.
* 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
DTC Type Reference

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

Circuit/System Testing

1. Engine running, observe the DTC information with a scan tool. Verify that DTC P0016, P0324, P0325, or P0340 is not set.

• If any of the DTCs are set, 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. DTC P050B should not set.

• If P050B is set, replace the ECM.

Repair Instructions

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

Control Module References (Programming and Relearning) for ECM replacement, setup, and programming