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 P0704: Clutch Switch Circuit

### Circuit/System Description

The engine control module (ECM) supplies a 5 volts to the Clutch Switch Circuit. This circuit ensures the engine can only be started when the clutch pedal is fully depressed. When the pedal is full depressed the circuit is earthed through the switch circuit.

### Conditions for Running the DTC

• | The engine is running.

• | The system voltage is between 9-18 volts.

### Conditions for Setting the DTC

The ECM detects that 15 gear changes have been performed with less than 3 clutch pedal switch inputs.

### Action Taken when the DTC Sets

DTC P0704 is a type C DTC.

### Conditions for Clearing the MIL/DTC

DTC P0704 is a type C DTC.

### Reference Information

#### Schematic Reference

Starting and Charging Schematics

#### Connector End View Reference

Component Connector End Views

#### 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

Ignition ON, While observing the scan tool depress and release the clutch pedal, the scan tool display display should toggle between Inactive to Active when the pedal is depressed.

### Circuit/System Testing

1. Ignition OFF, disconnect the Clutch pedal switch at the switch.
2. Ignition ON, verify that a test lamp illuminate between the signal terminal and a known ground.

⇒ | If the test lamp does not illuminates, test the signal circuit for a short to ground or an open/high resistance. If circuit tests normal replace the ECM.

3. Connect a 10A fusible link wire between the signal circuit and the earth terminal at the wiring harness connection.

⇒ | observe the scan tool active should be displayed.

⇒ | If the display still reads inactive, test the earth circuit for a short to ground or an open/high resistance.

4. If all circuits test normal replace the clutch switch.

### Repair Instructions

Replace the clutch switch refer to Clutch Pedal Position Switch Replacement

Perform the Diagnostic Repair Verification.

### Repair Verification

Ignition ON, While observing the scan tool depress and release the clutch pedal, the scan tool display display should toggle between Inactive to Active when the pedal is depressed.