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 C1527 0B: Motor Circuit High Current Above Threshold
DTC C1527 01: Motor Circuit High Current Short to Battery
DTC C1529 00: Motor Circuit Low Current Malfunction

### Diagnostic Fault Information

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

Circuit | Short to Ground | Open/High Resistance | Short to Voltage | Signal Performance
--- | --- | --- | --- | ---
Power Steering Pump Motor | C1529 00 | C1529 00 | C1527 01C,1527 0B | --

### Circuit/System Description

The power steering control module (PSCM) monitors the motor amperage to ensure that the amperage stays within proper range. Damage to components and incorrect data may occur when the amperage is out of range.

### Conditions for Running the DTC

####

• | Engine Running or Engine Starting (see below)

• | Power steering pump motor amperage is 55-65 Amps with the steering wheel turned and held full right or left.

### Conditions for Setting the DTC

#### DTC C1527 0B, 01

The actual motor current is greater than 75 Amps for at least 1.0 second during ignition ON and engine starting.

#### DTC C1529 00

The actual motor current is less than 11 amps during engine starting.

### Action Taken When the DTC Sets

#### DTC C1527 0B, 01

Steering boost is switched OFF.

#### DTC C1529 00

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

#### Scan Tool Reference

Control Module References for scan tool information

### Circuit/System Testing

1. Ignition OFF, Wait 3 seconds, Ignition ON, All accessories OFF with a scan tool verify Actual Motor Current to be 0 Amps
2. Ignition ON, Engine ON, All accessories OFF, the Actual Motor Current should be 4 to 5 Amps.
3. Turn steering wheel right until stop, turn slightly further and hold firmly in this position. The Actual Motor Current should be between 55-65 Amps.
4. Turn steering wheel left until stop, turn slightly further and hold firmly in this position. The Actual Motor Current should be between 55-65 Amps.

⇒ | If the amperage is not within the specified range, replace the power steering control module.

### Repair Instructions

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

• | Perform the Diagnostic Repair Verification after completing the repair.

• | Power Steering Pump Replacement

• | Power Steering Pump Wiring Harness Replacement