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 4 times before the diagnostic reports a fault. |
Action Taken When the DTC Sets
| • | The PCM will not turn on the Malfunction Indicator Lamp (MIL). |
| • | The PCM records the operating conditions at the time the diagnostic
fails. The first time the diagnostic fails, the Failure Records will store
this information. If the diagnostic reports a failure on the second consecutive
drive trip, the Freeze Frame records the operating conditions at the time
of failure and updates the Failure Records. |
Conditions for Clearing the MIL/DTC
| • | A History DTC clears after forty consecutive warm-up cycles,
if this or any other emission related diagnostic does not report any failures. |
| • | The use of a Scan Tool. |
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:
| • | Check for poor connections. Check for adequate terminal tension.
for proper procedure. |
| • | Rubbed through wire insulation |
| • | Broken wire inside the insulation |
Refer to Transmission for clutch switch adjustment.
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.
