P0704

DTC P0704 Clutch Switch Circuit




Circuit Description
The Clutch Pedal Position (CPP) Switch is used to determine when the clutch pedal is applied. Ignition voltage is applied to the VCM CPP input through the CPP switch. When the clutch pedal is depressed, ignition voltage is removed from this input. This is seen by the VCM as a clutch pedal application. The VCM monitors the CPP signal for transitions during normal vehicle operations If the VCM observes that no clutch pedal applications have occurred during a predetermined test cycle, a DTC P0704 will be set.

Conditions for Running the DTC
- No active VS sensor DTCs
- The vehicle speed is now 0 mph but had been greater than 40 mph (64 km/h)
- The brakes are not applied

Conditions for Setting the DTC
The VCM has not detected any changes in the clutch switch status.

Action Taken When the DTC Sets
- The VCM illuminates the MIL (Malfunction Indicator Lamp) if a failure is detected during 2 consecutive key cycles.
- The VCM will set the DTC and records the operating conditions at the time the diagnostic fails. The VCM stores the failure information in the scan tools Freeze Frame and/or the Failure Records.

Conditions for Clearing the MIL/DTC
- The VCM turns OFF the MIL after 3 consecutive drive trips when the test has Run and Passed.
- A history DTC will clear if no fault conditions have been detected for 40 warm-up cycles (coolant temperature has risen 22 °C (40 °F) from the startup coolant temperature and the engine coolant temperature is more than 70 °C (158 °F) during the same ignition cycle).
- Use the scan tool Clear Information function.

Diagnostic Aids
When the clutch pedal is released the clutch switch is ON.
If the brake pedal is applied with the clutch pedal released, the clutch switch will be OFF.
A poor connection, a rubbed through wire insulation, or a wire that is broken inside the insulation may cause an intermittent problem.
An intermittent may be caused by any of the following conditions:
- A poor connection
- Rubbed through wire insulation
- A broken wire inside the insulation
Thoroughly check any circuitry that is suspected of causing the intermittent complaint. Refer to Intermittents and Poor Connections Diagnosis.

If a repair is necessary, then refer to Wiring Repairs or Connector Repairs.

Steps 1 - 3:

Steps 4 - 8:

Steps 9 - 11:

Test Description
The numbers below refer to the step numbers in the diagnostic table.
2. This test determines if the VCM is receiving data from the clutch switch.
4. This test determines if the clutch switch is stuck on or OFF.
6. This step checks for a short to B+ in the CPP switch input circuit.