P0704

Circuit Description

The Clutch Anticipate Switch input allows the 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 (clutch engaged). When the ground at the Clutch Anticipate Switch input is interrupted (clutch being disengaged), 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. (clutch switch closed to ground).
^ Above conditions must be present for longer than 3 minutes.

OR

^ Changes in the vehicle speed to engine speed ratio indicate that more than 150 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 Fail Records data only. This information will not be stored as Freeze Frame data.

Conditions for Clearing the MIL/DTC

^ A history DTC will clear after 40 consecutive warm-up cycles have occurred without a malfunction.
^ DTC can be cleared by using the scan tool Clear Info function.

Diagnostic Aids

Check for the following conditions:

^ Poor connection at PCM - Inspect harness connectors for the following items:
^ Backed out terminals
^ Improper mating
^ Broken locks
^ Improperly formed or damaged terminals
^ Poor terminal to wire connections
^ Damaged harness - Inspect the wiring harness for damage. If the harness appears to be OK, observe the Clutch Anticipate Switch display on the scan tool while moving connectors and wiring harnesses related to the switch. A change in the display will indicate the location of the fault. Review the Freeze Frame/Fail Records vehicle mileage since the diagnostic test last failed. This may help determine how often the condition that caused the DTC to be set occurs.

Test Description

Number(s) below refer to the step number(s) on the Diagnostic Table:

2. This step checks the true state of the clutch pedal switch.
7. This step checks 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 being replaced, the new PCM must be programmed.