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 P0806: Clutch Pedal Position (CPP) Sensor Circuit Performance

### Diagnostic Fault Information

Circuit | Short to Ground | Open/High Resistance | Short to Voltage | Signal Performance
--- | --- | --- | --- | ---
CPP Sensor Signal | P0807 | P0807 | P0808 | P0806
CPP Sensor 5-Volt Reference | P0651, P0807 | P0807 | P0651, P0808 | --
CPP Sensor Low Reference | -- | P0808 | P0808 | --

### Typical Scan Tool Information

#### CPP Sensor Voltage

Circuit | Short to Ground | Open | Short to Voltage
--- | --- | --- | ---
Operating Conditions: Ignition ON. CPP Sensor Voltage Parameter Normal Range: 0-volts with clutch pedal applied to 5-volts when clutch pedal is released.
CPP Sensor 5-Volt Reference | 0 volts | 0 volts | 5 volts
CPP Sensor Signal | 0 volts | 0 volts | 5 volts
CPP Sensor Low Reference | -- | 5 volts | --

#### CPP Sensor Percentage

Circuit | Short to Ground | Open | Short to Voltage
--- | --- | --- | ---
Operating Conditions: Ignition ON. CPP Sensor Percent Parameter Normal Range: 0% with clutch pedal released to 100% when clutch pedal is applied.
CPP Sensor 5-Volt Reference | 100% | 100% | 0-100%
CPP Sensor Signal | 100% | 100% | 100%
CPP Sensor Low Reference | -- | 0% | --

### 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 volt when the clutch pedal is applied.

### Conditions for Running the DTC

DTCs P0335, P0336, P0502, P0503, P0607, P0808, or P080A are not set.

### Conditions for Setting the DTC

The CPP sensor is stuck in range.

### Action Taken When the DTC Sets

P0806 is a Type A DTC.

### Conditions for Clearing the MIL/DTC

P0806 is a Type A DTC.

### Reference Information

#### Schematic Reference

Manual Transmission Schematics

#### Connector End View Reference

Component Connector End Views

#### Description and Operation

Manual Transmission Description and Operation

#### Electrical Information Reference

• | Circuit Testing

• | Connector Repairs

• | Testing for Intermittent Conditions and Poor Connections

• | Wiring Repairs

#### DTC Type Reference

Powertrain Diagnostic Trouble Code (DTC) Type Definitions

#### Scan Tool Reference

Engine Control Module Scan Tool Information

### Circuit/System Verification

1. Ignition ON, observe the scan tool CPP sensor percent parameter. The percentage should vary from 0 percent when the clutch pedal is released, to 100 percent when the clutch pedal is in the apply position.
2. Perform the CPP learn procedure. Refer to Clutch Pedal Position Sensor Learn.
3. Operate the vehicle within the conditions for running the DTC to verify the DTC does not reset. You may also operate the vehicle within the conditions that you observed from the Freeze Frame/Failure Records data.

### Circuit/System Testing

1. Ignition OFF, disconnect the harness connector of the CPP sensor.
2. Ignition ON, observe the scan tool CPP sensor voltage parameter for 0.1-volt.

⇒ | If less than the specified value, replace the CPP sensor.

⇒ | If greater than the specified value, replace the ECM.

### Component Testing

1. Ignition OFF, disconnect the harness connector of the CPP sensor.
2. Measure the resistance between the signal terminal B and the low reference terminal A of the CPP sensor. Sweep the CPP sensor through the entire range. The resistance should vary low to high and high to low without any spikes or dropouts.

⇒ | If the resistance is erratic with spikes or dropouts, replace the CPP sensor.

### Repair Instructions

Perform the Diagnostic Repair Verification after completing the diagnostic procedure.

• | Clutch Pedal Replacement

• | Engine Control Module Replacement or Engine Control Module Replacement

• | Engine Control Module Programming and Setup