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 Failure 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. |
| • | The 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:
-
This step tests the true state of the clutch pedal switch.
-
This step tests the integrity of the Clutch Anticipate Switch input circuit.
-
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.
Step | Action | Value(s) | Yes | No |
|---|---|---|---|---|
1 | Did you perform the Powertrain On-Board Diagnostic (OBD) System Check performed? | -- | ||
Does the scan tool indicate Released? | -- | |||
3 | Depress the clutch pedal while observing the Clutch Pedal Switch parameter on the scan tool. Does the parameter change to Applied? | -- | Go to Diagnostic Aids | |
4 | Disconnect the Clutch Anticipate Switch. Does the scan tool indicate Applied? | -- | ||
5 |
Does the test lamp illuminate? | -- | ||
6 |
Does the test lamp illuminate? | -- | ||
Does the scan tool indicate Released? | -- | |||
8 |
Did you find and correct the condition? | -- | ||
9 | Repair the short to ground in Clutch Anticipate Switch signal circuit. Refer to Wiring Repairs . Did you complete the repair? | -- | -- | |
10 | Repair open in Clutch Anticipate Switch ground circuit. Refer to Wiring Repairs . Did you complete the repair? | -- | -- | |
11 | Test the Clutch Anticipate Switch adjustment. Refer to Clutch Anticipate Switch Replacement . Did you find and correct the condition? | -- | ||
12 | Inspect for poor connections at the Clutch Anticipate Switch. Refer to Intermittents and Poor Connections Diagnosis and Connector Repairs . Did you find and correct the condition? | -- | ||
13 | Replace the Clutch Anticipate Switch. Refer to Clutch Anticipate Switch Replacement . Did you complete the replacement? | -- | -- | |
14 | Inspect for poor connections at PCM. Refer to Intermittents and Poor Connections Diagnosis and Connector Repairs . Did you find and correct the condition? | -- | ||
|
Important: The replacement PCM must be programmed. Refer to Powertrain Control Module Replacement/Programming . Replace the PCM. Did you complete the replacement? | -- | -- | ||
16 |
Does scan tool indicate Released? | -- | ||
17 | Depress the clutch pedal while observing the Clutch Pedal Switch display on the scan tool. Does the parameter change to Applied? | -- | System OK |
