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 C1512 00: Temperature Sensor Circuit Malfunction
DTC C1512 01: Temperature Sensor Circuit Short to Battery
DTC C1512 02: Temperature Sensor Circuit Short to Ground
DTC C1512 54: Temperature Sensor Circuit Temperature High

### Circuit/System Description

The power steering control module (PSCM) monitors the temperature of the power steering system. The PSCM uses voltage, current levels and input from an internal temperature sensor to calculate an estimated system temperature. If the PSCM detects a high system temperature event is occurring, the amount of assist is reduced to lower system temperature to prevent thermal damage to the power steering components.

### Conditions for Running the DTC

• | Engine Running.

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

• | Repetitive steering input is present.

### Conditions for Setting the DTC

The PSCM detects a high system temperature.

### Action Taken When the DTC Sets

Steering assist is reduced.

### Conditions for Clearing the DTC

• | A current DTC will clear when the Power Steering System temperature returns to normal.

• | 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 Verification

1. Verify that DTC C1512 is not set.

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

### 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 Tech 2 BEFORE replacing the module.

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

• | Power Steering Pump Replacement

• | Power Steering Pump Wiring Harness Replacement