PSCM

DTC C0899 (PSCM)

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 C0899 03
- Device Voltage Low - PSCM

Diagnostic Fault Information






Typical Scan Tool Data






Circuit/System Description

The power steering control module (PSCM) monitors the battery voltage available in order to ensure the power steering system has adequate voltage levels to perform the system functions.

Conditions for Running the DTC

The ignition is ON.

Conditions for Setting the DTC

The power steering system voltage is less than 9 volts for 1 second.

Action Taken When the DTC Sets

* No steering assist is provided.
* The driver information center (DIC) displays the POWER STEERING message.

Conditions for Clearing the DTC

* The condition for the DTC is no longer present.
* The PSCM automatically clears the history DTC when a current DTC is not detected in 100 consecutive ignition cycles.

Diagnostic Aids

A low voltage DTC in multiple modules indicates a concern in the charging system.

Reference Information
Schematic Reference

Power Steering Schematics Electrical Diagrams
Connector End View Reference

Component Connector End Views Connector End Views By Name
Description and Operation

* Power Steering System Description and Operation (Electronic Power Steering) Power Steering System (Electronic Power Steering)Power Steering System Description and Operation (Hydraulic Power Steering) Power Steering System (Hydraulic Power Steering)
* Charging System Description and Operation Description and Operation

Electrical Information Reference

* Circuit Testing Circuit Testing
* Connector Repairs Connector Repairs
* Testing for Intermittent Conditions and Poor Connections Testing for Intermittent Conditions and Poor Connections
* Wiring Repairs Wiring Repairs

Scan Tool Reference

Control Module References Programming and Relearning for scan tool information

Circuit/System Verification

1. Engine running, accessories OFF, measure and record the voltage at the battery voltage at the battery terminals. The voltage should be between 12.6 and 15.0 volts.

• If not within the specified range, refer to Charging System Test Charging System Test.

2. Observe the scan tool PSCM Battery Voltage Signal parameter. The reading should be between 12.6 and 15.0 volts.

Circuit/System Testing

1. Ignition OFF, disconnect the harness connector at the PSCM.
2. Ignition OFF and scan tool disconnected, open and close the drivers door, and wait 1 minute. Test for less than 5 ohms between the ground circuit terminal A X1 and ground.

• If greater than the specified range, test the ground circuit for an open/high resistance.

3. Verify that a test lamp illuminates between the B+ circuit terminal B X1 and ground.

• If the test lamp does not illuminate, test the B+ circuit for a short to ground or an open/high resistance.

4. Ignition ON, verify that a test lamp illuminates between the ignition circuit terminal 8 X2 and ground.

• If the test lamp does not illuminate, test the ignition circuit for a short to ground or an open/high resistance.

5. If all circuits test normal, replace the PSCM.

Repair Instructions

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

Control Module References Programming and Relearning for PSCM replacement, setup and programming.