P0704

CIRCUIT DESCRIPTION
The clutch switch is a normally closed switch. The powertrain control module (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 0-38 km/h (0-24 mph).

CONDITIONS FOR RUNNING THE DTC
No active vehicle speed sensor (VSS) DTCs

CONDITIONS FOR SETTING THE DTC
^ Vehicle speed goes from 0 to more than 38 km/h (24 mph) and back to 0 km/h (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 DTC
^ A last test failed, or current DTC, clears when the diagnostic runs and does not fail.
^ A history DTC will clear after 40 consecutive warm-up cycles, if no failures are reported by this or any other non-emission related diagnostic.
^ Use a scan tool in order to clear the DTC.

DIAGNOSTIC AIDS

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

The following may cause an intermittent:
^ Poor connections-Refer to Testing for Intermittent and Poor Connections in Diagrams.
^ Corrosion
^ Misrouted 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 Failure Records data may aid in locating an intermittent condition. If you cannot duplicate the DTC, the information included in the Freeze Frame and 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 or a fail. Operate the vehicle within the same Freeze Frame conditions, such as RPM, load, vehicle speed, temperature etc., that you observed. This will isolate when the DTC failed. For an intermittent, refer to Testing for Intermittent and Poor Connections in Diagrams.

TEST DESCRIPTION

Steps 1-12:

The number below refers to the step number on the diagnostic table.
3. This step determines if the fault is present.