Chevrolet Trax: DTC P0806-P0808: Clutch pedal position (CPP) Sensor

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

Typical Scan Tool Data

CPP Sensor Voltage

CPP Sensor Percentage

Circuit/System Description

The clutch pedal position (CPP) sensor is a three wire sensor, connected to a 5 V reference circuit, a low reference circuit, and a signal circuit. The engine control module supplies 5 V 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 near 4 V when the clutch pedal is released, to a voltage near 1 V when the clutch pedal is applied.

Conditions for Running the DTC

P0806

• DTC P0335, P0336, P0502, P0503, P0807, or P0808 is not set.
• The engine is running with transmission in gear.
• The vehicle speed is greater than 1.9 kmh (1.2 mph).

P0807 and P0808

• The ignition is ON.
• The system voltage is more than 10 V.

Conditions for Setting the DTC

P0806

The CPP sensor is stuck in range.

P0807

The CPP sensor voltage is less than 0.2 V for more than 1 s.

P0808

The CPP sensor voltage is more than 4.8 V for more than 1 s.

Action Taken When the DTC Sets

DTC P0806 - P0808 are Type A DTCs.

Conditions for Clearing the DTC

DTC P0806 - P0808 are Type A DTCs.

Reference Information

Schematic Reference

Manual Transmission Schematics (Encore, MR5), Manual Transmission Schematics (Trax, MR5)

Connector End View Reference

WIRING SYSTEMS AND POWER MANAGEMENT - COMPONENT CONNECTOR END VIEWS - INDEX - ENCORE WIRING SYSTEMS AND POWER MANAGEMENT - COMPONENT CONNECTOR END VIEWS - INDEX - TRAX

Description and Operation

Transmission System 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 (LUV) , Powertrain Diagnostic Trouble Code (DTC) Type Definitions (2H0)

Scan Tool Reference

K20 Engine Control Module: Scan Tool Information (LUV or 2H0) for scan tool information

Circuit/System Verification

1. Ignition ON.
2. Verify DTC P0651 or P080A is not set

If DTC P0651 or P080A is set

Refer to Diagnostic Trouble Code (DTC) List - Vehicle .

If DTC P0651 or P080A is not set

3. Verify the scan tool CPP Sensor percent parameter varies from 0% when the clutch pedal is released, to 100% when the clutch pedal is in the apply position.

If the percentage does not vary from 0% to 100%

Refer to Circuit/System Testing.

If the percentage varies from 0% to 100%

4. Operate the vehicle within the conditions for running the DTC to verify the DTC does not set. You may also operate the vehicle within the conditions that you observed from the Freeze Frame/Failure Records data.

If the DTC sets

Refer to Circuit/System Testing.

If the DTC does not set

5. All OK.

Circuit/System Testing

1. Ignition OFF and all vehicle systems OFF. Disconnect the harness connector at the B25B Clutch Pedal Position Sensor. It may take up to 2 min for all vehicle systems to power down.
2. Test for less than 5 ohms between the low reference circuit terminal C and ground.

If 5 ohms or greater

1. Disconnect the X3 harness connector at the K20 Engine Control Module.
2. Test for less than 2 ohms in the circuit end to end.

• If 2 ohms or greater, repair the open/high resistance in the circuit.
• If less than 2 ohms, replace the K20 Engine Control Module.

If less than 5 ohms

3. Ignition ON.
4. Test for 4.8-5.2 V between the 5 V reference circuit terminal A and ground.

If less than 4.8 V

1. Ignition OFF, disconnect the X3 harness connector at the K20 Engine Control Module.
2. Test for infinite resistance between the 5 V reference circuit and ground.

• If less than infinite resistance, repair the short to ground on the circuit.
• If infinite resistance

3. Test for less than 2 ohms in the 5 V reference circuit end to end.

• If 2 ohms or greater, repair the open/high resistance in the circuit.
• If less than 2 ohms, replace the K20 Engine Control Module.

If greater than 5.2 V

1. Ignition OFF, disconnect the X3 harness connector at the K20 Engine Control Module, Ignition ON.
2. Test for less than 1 V between the 5 V reference circuit and ground.

• If 1 V or greater, repair the short to voltage on the circuit.
• If less than 1 V, replace the K20 Engine Control Module.

If between 4.8-5.2 V

5. Verify the scan tool CPP Sensor voltage parameter is less than 0.1 V.

• If 0.1 V or greater

1. Ignition OFF, disconnect the X3 harness connector at the K20 Engine Control Module, Ignition ON.
2. Test for less than 1 V between the signal circuit terminal B and ground.

• If 1 V or greater, repair the short to voltage on the circuit.
• If less than 1 V, replace the K20 Engine Control Module.

If less than 0.1 V

6. Install a 3 A fused jumper wire between the signal circuit terminal B and the 5 V reference circuit terminal A.
7. Verify the scan tool CPP Sensor voltage parameter is greater than 4.9 V.

If 4.9 V or less

1. Ignition OFF, remove the jumper wire, disconnect the X3 harness connector at the K20 Engine Control Module.
2. Test for infinite resistance between the signal circuit terminal B and ground.

• If less than infinite resistance, repair the short to ground on the circuit.
• If infinite resistance

3. Test for less than 2 ohms in the signal circuit end to end.

• If 2 ohms or greater, repair the open/high resistance in the circuit.
• If less than 2 ohms , replace the K20 Engine Control Module.

If greater than 4.9 V

8. Test or replace the B25B Clutch Pedal Position Sensor.

Component Testing

Static Test

1. Ignition OFF, disconnect the harness connector of the B25B Clutch Pedal Position Sensor.
2. Measure the resistance between the signal terminal B and the low reference terminal C at the B25B Clutch Pedal Position Sensor. Depress the clutch pedal through the entire range. The resistance should vary from low to high and vice versa without any spikes or dropouts.

If the resistance is erratic with spikes or dropouts

Replace the B25B Clutch Pedal Position Sensor.

If the resistance is not erratic without spikes or dropouts

3. All OK.

Repair Instructions

Perform the Diagnostic Repair Verification after completing the repair.

• Clutch Pedal Position Sensor Replacement
• Control Module References for ECM replacement, programming and setup.

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