P0704

Circuit Description
The clutch switch is a normally closed switch. The PCM receives an ignition voltage on the clutch switch circuit when the clutch switch is closed. The PCM receives 0 voltage on the clutch switch circuit when the clutch switch is open.
This DTC determines if the Transmission Clutch switch has failed by monitoring for a clutch switch transition within a range from 0 mph to 24 MPH.

Conditions for Running the DTC
No VSS DTCs.

Conditions for Setting the DTC
^ Vehicle speed goes from 0 mph to greater than 24 mph and back to 0 mph for 2 seconds without the PCM detecting a clutch transition.
^ This occurs 7 times before the diagnostic reports a fault.

Action Taken When the DTC Sets
^ The PCM stores the DTC information into memory when the diagnostic runs and fails.
^ The Malfunction Indicator Lamp (MIL) will not illuminate.
^ The PCM records the operating conditions at the time the diagnostic fails. The PCM stores this information in the Failure Records.

Conditions for Clearing the MIL/DTC
^ A History DTC will clear after forty consecutive warm-up cycles, if no failures are reported by this or any other non-emission related diagnostic.
^ A last test failed (Current DTC) will clear when the diagnostic runs and does not fail.
^ Use a scan tool in order to clear the MIL/DTC.

Diagnostic Aids

Important: Remove any debris from the PCM connector surfaces before servicing the PCM. Inspect the PCM connector gaskets when diagnosing/replacing the PCM. Ensure that the gaskets are installed correctly. The gaskets prevent water intrusion into the PCM.

The following may cause an intermittent:
^ Test for poor connections.
^ Corrosion.
^ Mis-routed harness.
^ Rubbed through wire insulation.
^ Broken wire inside the insulation.

The vehicle may need to be driven to locate an intermittent condition. Monitor the clutch switch parameter on the scan tool. If the parameter changes state while driving, inspect for proper connections. Using Freeze Frame and/or Failure Records data may aid in locating an intermittent condition. If you cannot duplicate the DTC, the information included in the Freeze Frame and/or Failure Records data can aid in determining how many miles since the DTC set. The Fail Counter and Pass Counter can also aid determining how many ignition cycles the diagnostic reported a pass and/or a fail. Operate the vehicle within the same freeze frame conditions (RPM, load, vehicle speed, temperature etc.) that you observed. This will isolate when the DTC failed. For an intermittent, refer to Symptoms. Symptom Related Diagnostic Procedures

Test Description
The numbers below refer to the step numbers on the diagnostic table.
2. This step determines if the fault is present.