PIPE AS-TRANSFER 1W8945 - Caterpillar

Illustration 1 g00482723
Schematic Of The Transmission Pressure SwitchThis diagnostic code is recorded when the ECM reads the voltage of the switch circuit as above normal (short to +battery).Possible causes of this diagnostic code are listed:
Wire 815-WH shorted to +battery.
The switch is faulty.
The ECM is faulty.Note: Ensure that the CID 0602 FMI 03 for the switch is active.As a result of this diagnostic code, the transmission will not properly shift.
CHECK THE SIGNAL CIRCUIT FOR A SHORT TO +BATTERY.
Turn the key start switch and the disconnect switch to the OFF position.
Disconnect the switch with the diagnostic code from the machine harness.
Disconnect the machine harness connectors J1 and J2 from the ECM.
At the machine harness connector J1 and J2, measure the resistance from signal contact J1-14 (wire 815-WH) to all possible sources of +battery. The possible sources of positive voltage are contacts: J1-1 (wire 126-PK), J1-4 (wire A958-WH), J1-6 (wire 126-PK), J1-8 (wire 306-GN), J1-10 (wire 728-BU), J1-11 (wire 705-PK), J1-12 (703-BU), J1-17 (wire 904-BU), J1-18 (wire 704-GY), J2-1 (wire K746-PK), J2-2 (wire 368-OR), J2-7 (wire G870-GY), J2-8 (wire K745-YL), J2-13 (wire G705-GN), J2-19 (wire G704-YL) and J2-37 (wire 321-BR).Expected Result: The resistance should be greater than 5000 ohms for each measurement.Results:
YES - The resistance is correct. The machine harness is correct. Proceed to 2.
NO - There is a short in the machine harness. The short is between the signal contact J1-14 (wire 815-WH) and the circuit with the low resistance measurement. Repair the harness or replace the harness. STOP.
CHECK THE SWITCH.
Turn the disconnect switch and the key start switch to the ON position.
Access the service mode. Place the CID 0602 FMI 03 on-hold. Ensure that the "SERV CODE" indicator shows "SERV CODE".
Observe the status of the "SERV CODE" indicator. Disconnect the machine harness from the switch. If the switch is not the cause of the diagnostic code, "SERV CODE" remains ON. If the switch is faulty, "SERV CODE" goes OFF.Expected Result: The "SERV CODE" remains ON.Results:
OK - The "SERV CODE" remains ON. The switch is not the cause of the diagnostic code. Proceed to 3.
NOT OK - The "SERV CODE" goes OFF. The switch is faulty. Replace the switch. STOP.
CHECK IF THE DIAGNOSTIC CODE REMAINS.
Inspect the contacts and clean the contacts of the harness connectors.
Reconnect all harness connectors.
Turn the disconnect switch and the key start switch to the ON position.
Enter the service mode of the Caterpillar Monitoring System and clear all the inactive diagnostic codes.
Attempt to operate the machine in all gears. All gears may not be available.
Stop the machine and engage the parking brake.
Check the status of CID 0602 FMI 03 for the switch. The "SERV CODE" is showing.Expected Result: The CID 0602 FMI 03 for the switch is present. The "SERV CODE" is showing.Results:
NO - The diagnostic code is present. The "SERV CODE " is showing. The diagnostic code has not been corrected. It is unlikely that the ECM is faulty. Exit this procedure and perform this CID 0602 FMI 03 again. If the cause of the diagnostic code