For 1990-2009 cars

### Diagnostic Instructions

• | Perform the Diagnostic System Check - Vehicle prior to using this diagnostic procedure.

• | Review Strategy Based Diagnosis for an overview of the diagnostic approach.

• | Diagnostic Procedure Instructions provides an overview of each diagnostic category.

### DTC Descriptor

DTC C1528 00: Motor Speed Invalid Signal Malfunction

### Circuit/System Description

The power steering control module (PSCM) monitors the pump motor circuits and sets a code for out of range signals.

### Conditions for Running the DTC

Engine Running

### Conditions for Setting the DTC

• | Sensor signal is out of range.

• | Above condition must be fulfilled for at least 0.2 seconds.

### Action Taken When the DTC Sets

The system function is not affected.

### Conditions for Clearing the DTC

A history DTC will clear after 60 consecutive malfunction-free ignition cycles.

### Reference Information

#### Schematic Reference

Power Steering Schematics

#### Connector End View Reference

Component Connector End Views

#### Description and Operation

Power Steering System Description and Operation

#### Electrical Information Reference

• | Circuit Testing

• | Connector Repairs

• | Testing for Intermittent Conditions and Poor Connections

• | Wiring Repairs

### Circuit/System Verification

1. Verify that DTC C1528 is set.

⇒ | If the DTC is set, reprogram the PSCM. If the DTC resets, replace the PSCM.

### Repair Instructions

Perform the Diagnostic Repair Verification after completing the diagnostic procedure.

Important: For any module replacement a set procedure needs to be followed. A "Reset" needs to be performed from the PROGRAMMING menu of the current system with the scan tool BEFORE replacing the module.

• | Power Steering Pump Replacement

• | Power Steering Pump Wiring Harness Replacement