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 Descriptors

DTC P0806: Clutch Pedal Position (CPP) Sensor Performance
DTC P0807: Clutch Pedal Position (CPP) Sensor Circuit Low Voltage
DTC P0808: Clutch Pedal Position (CPP) Sensor Circuit High Voltage

### Diagnostic Fault Information

Circuit | Short to Ground | Open/High Resistance | Short to Voltage | Signal Performance
--- | --- | --- | --- | ---
5 V Reference | P0806 P0807 | P0806 P0807 | P0808 | --
Position Sensor Signal | P0807 | P0807 | P0808 | P0806
Low Reference | -- | P0808 | -- | --

### Circuit/System Description

The clutch pedal position (CPP) sensor is a three-wire sensor, connected to a 5-volt reference circuit, a low reference circuit, and a signal circuit. The engine control module (ECM) supplies 5 volts to the CPP sensor, and also provides a sensor ground path on the low reference circuit. The CPP sensor sends a voltage signal to the ECM on the signal circuit. The voltage on the signal circuit will vary from a voltage less than or equal to 5 volts when the clutch pedal is released, to a voltage less than or equal to 1.5 volts when the clutch pedal is applied.

### Conditions for Running the DTC

System voltage is greater than 9 V.

### Conditions for Setting the DTC

#### P0806

The ECM detects that the clutch pedal position (CPP) sensor is stuck in a range less than the learned released position when the clutch is determined to be released.

#### P0807

The ECM detects that the clutch pedal position (CPP) sensor voltage is less than 0.25 V.

#### P0808

The ECM detects that the clutch pedal position (CPP) sensor voltage is greater than 4.75 V.

### Action Taken When the DTC Sets

DTC P0806 is type A DTC.

### Conditions for Clearing the DTC

The current DTC will clear when the fault is no longer present.

### Reference Information

#### Schematic Reference

Manual Transmission Schematics

#### Connector End View Reference

Component Connector End Views

#### Description and Operation

Transmission 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

### Circuit/System Verification

Ignition ON, observe the scan tool CPP Sensor parameter. The reading should be between 0.25 V and 4.75 V and change while the clutch pedal is pressed and released.

### Circuit/System Testing

1. Ignition OFF, disconnect the harness connector at the clutch pedal position sensor.
2. Test for less than 2 Ω between the low reference circuit terminal and ground.

⇒ | If greater than the specified range, test the low reference circuit for an open/high resistance. If the circuit tests normal, replace the ECM.

3. Ignition ON, test for 4.8-5.2 V between the 5 V reference circuit terminal and ground.

⇒ | If less than the specified range, test the 5 V reference circuit for a short to ground or an open/high resistance. If the circuit tests normal, replace the ECM.

⇒ | If greater than the specified range, test the 5 V reference circuit for a short to voltage. If the circuit tests normal, replace the ECM.

4. Verify the scan tool CPP Sensor parameter is greater than 4.75 V.

⇒ | If less than the specified range, test the signal circuit terminal for a short to ground. If the circuit tests normal, replace the ECM.

5. Install a 3A fused jumper wire between the signal circuit terminal and the low reference circuit terminal. Verify the scan tool CPP Sensor parameter is less than.25 V.

⇒ | If greater than the specified range, test the signal circuit for short to voltage or an open/high resistance. If the circuit tests normal, replace the ECM.

6. If all circuits test normal, test or replace the clutch pedal position sensor.

### Repair Instructions

Perform the Diagnostic Repair Verification after completing the diagnostic procedure.

Control Module References for ECM replacement, setup, and programming