VALVE-RELIEF 0906027 - Caterpillar

If the "Transmission Style" parameter is programmed to one of the following options, the input for the clutch pedal position switch is not used:
"Automatic Option 1"
"Automatic Option 2"
"Automatic Option 3"
"Automatic Option 4"The clutch pedal position switch connects to the ECM at terminal location P1-22. The status of the clutch pedal position switch can also be reported over the J1939 data link.
Illustration 1 g01255422
Schematic for the clutch pedal position switch
Test Step 1. Check the Status for the Clutch Pedal Position Switch
Connect Caterpillar Electronic Technician (ET) to the service tool connector.
Turn the keyswitch to the ON position.
Monitor the status of the clutch pedal position switch on Cat ET while you depress the clutch pedal. Release the clutch pedal and allow the clutch pedal to return. Check the status of the clutch pedal position switch. The correct status for the clutch pedal position switch is "Off" when the clutch is released. The correct status for the clutch pedal position switch is "On" when the clutch is depressed.
Turn the keyswitch to the OFF position. Expected Result:Cat ET reports the correct status for the clutch pedal position switch.Results:
OK - Cat ET reports the correct status for the clutch pedal position switch.Repair: The clutch pedal position switch appears to operating correctly at this time. There may be an intermittent electrical problem in the harness or in a connector. If an intermittent problem is suspected, refer to Troubleshooting, "Electrical Connectors - Inspect" for information that is related to troubleshooting intermittent electrical problems.STOP
Not OK - Cat ET is not reporting the correct status for the clutch pedal position switch. The clutch pedal position switch is not operating correctly. Proceed to Test Step 2.Test Step 2. Determine the Configuration of the Clutch Pedal Position Switch
Determine if the fan override switch is wired directly to the ECM, or if the switch position is reported on the J1939 data link.
Verify that the "Clutch Pedal Position Switch" parameter is programmed to reflect the current wiring for the circuit. Expected Result:The clutch pedal position switch is wired directly to the ECM at terminal location P1-22.Results:
OK - The clutch pedal position switch is wired directly to the ECM.Repair: Verify that the "Clutch Pedal Position Switch" parameter is programmed to "J1/P1:22".Proceed to Test Step 3.
Not OK - The clutch pedal position switch is not wired to the ECM.Repair: The switch position is reported to the ECM via the J1939 data link. Verify that the "Clutch Pedal Position Switch" parameter is programmed to "J1939 - Body Controller", to "J1939 - Cab Controller", or to "J1939 - Instrument Cluster".Refer to Troubleshooting, "Powertrain Data Link Circuit - Test" for information that is related to troubleshooting the J1939 data link.STOPTest Step 3. Inspect the Electrical Connectors and the Wiring
Illustration 2 g01186024
Location of the J1/P1 ECM connectors (typical left side engine view)
Thoroughly inspect the J1/P1 ECM connector, the connectors, and the firewall bulkhead connectors. Refer to Troubleshooting, "Electrical Connectors - Inspect" for details.
Illustration 3 g01255450
Terminal locations at the P1 ECM connector for the clutch pedal position switch
(P1-5) AP sensor/switch sensor return
(P1-22)