Transmission Diagnosis

DTC P0704






Circuit Description
The clutch anticipate switch input allows the powertrain control module (PCM) to adjust the idle when the manual transmission clutch is being disengaged. The PCM monitors the Clutch Anticipate Switch input; if a low voltage is monitored, the PCM considers the Clutch Anticipate Switch closed to ground. When the ground at the Clutch Anticipate Switch input is interrupted, the PCM will immediately decrease idle. This is done to avoid a possible RPM flare caused by the sudden change in engine load.

Conditions for Running the DTC
Engine load and engine speed acceleration indicate that the vehicle is in gear and moving.

Conditions for Setting the DTC
^ The Clutch Anticipate Switch PCM input indicates that the clutch is engaged. The clutch switch is closed to ground.
^ The above conditions must be present for more than 3 minutes.
OR
^ Changes in the vehicle speed to engine speed ratio indicate that more than 70 gear changes have occurred.
^ The state of the Clutch Anticipate Switch did not change.

Action Taken When the DTC Sets
^ The PCM will not illuminate the malfunction indicator lamp (MIL).
^ The PCM will store conditions which were present when the DTC set as Failure Records only. This information will not be stored as Freeze Frame Records.

Conditions for Clearing the MIL/DTC
^ A History DTC will clear after 40 consecutive warm-up cycles have occurred without a malfunction.
^ The DTC can be cleared by using a scan tool.

Diagnostic Aids
Many situations may lead to an intermittent condition. The following list is to be used as a guide to assist in detecting an intermittent:

Important: Remove any debris from the connector surfaces before servicing a component. Inspect the connector gaskets when diagnosing or replacing a component. Verify that the gaskets are installed correctly. The gaskets prevent intrusion of contaminates.

^ Inspect the harness connector for the following conditions:
- Loose terminal connections
- Backed out terminals
- Improper mating
- Broken locks
- Improperly formed or damaged terminals
- Faulty terminal to wire connections - Use a corresponding mating terminal to test for proper tension.
^ Inspect the wiring harness for damage. If the harness inspection does not reveal a concern, observe the display on the scan tool while moving connectors and wiring harnesses related to the sensor. A change in the scan tool display may indicate the location of the fault.
^ Inspect the PCM and the engine grounds for clean and secure connections.
If the DTC is determined to be intermittent, reviewing the Failure Records can be useful in determining when the DTC was last set.








Test Description
The numbers below refer to the step numbers on the diagnostic table:
2. This step tests the true state of the clutch pedal switch.
7. This step tests the integrity of the Clutch Anticipate Switch input circuit.
15. This vehicle is equipped with a PCM which utilizes an Electrically Erasable Programmable Read Only Memory (EEPROM). When the PCM is replaced, the new PCM must be programmed.