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 C1523 03: System Voltage Low Voltage
DTC C1523 07: System Voltage High Voltage

### 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 Control Module B+ | C1523 03 | C1523 03 | C1523 07 | --

### Circuit/System Description

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

### Conditions for Running the DTC

• | Engine Running

• | Power steering system voltage is 9-16 volts.

### Conditions for Setting the DTC

#### DTC C1523 03

The input voltage at the power steering control unit Connector X1, terminal 1 is less than 9 volts for at least 0.3 seconds.

#### DTC C1523 07

The input voltage at the power steering control unit Connector X1, terminal 1 is greater than 16 volts for at least 0.1 second.

### Action Taken When the DTC Sets

Steering boost is decreased.

### Conditions for Clearing the DTC

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

### Diagnostic Aids

• | Overheating of the system caused by overload.

• | After many steering movements the steering is overheated (for example, parking several times at high outside temperature).

### 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, disconnect the X2 harness connector at the power steering module.
2. Test for less than 5.0 Ohm between the ground circuit terminal 2 and ground.

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

3. Verify a test lamp illuminates between the circuit terminals listed below and ground.

• | Connector X2, terminal 1

• | Connector X1, terminal 1

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

4. If all circuits test normal, replace the power steering 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