D250E Series II, D300E Series II, D350E Series II and D400E Series II Articulated Trucks Power Train Electronic Control System Caterpillar

Illustration 1	g00482723
Schematic Of The Transmission Pressure Switch

This diagnostic code is recorded when the ECM reads the voltage of the circuit for the switch as being below normal.

The possible causes of this diagnostic code are listed:

• Wire 815-WH shorted to ground.

• The switch is faulty.

• The ECM is faulty.

Note: Ensure that the CID 0602 FMI 04 for the switch is active.

As a result of this diagnostic code, the transmission will not shift properly.

1. CHECK THE SIGNAL CIRCUIT FOR A SHORT TO GROUND.

   1. Turn the key start switch and the disconnect switch to the OFF position.

   2. Disconnect the switch with the diagnostic code from the machine harness.

   3. Disconnect the machine harness connectors J1 and J2 from the ECM.

   4. At the machine harness connector J1 and J2, measure the resistance from signal contact J1-14 (wire 815-WH) to all possible sources of ground. The possible sources of ground are contacts: J1-2 (wire 202-BK), J1-5 (wire 202-BK), J1-7 (wire F789-PU) and J1-15 (wire J764-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. Repair the harness or replace the harness. STOP.

2. CHECK THE SWITCH.

   1. Turn the key start switch and the disconnect switch to the ON position.

   2. Access the service mode. Place the CID 0602 FMI 04 on-hold. Ensure that the "SERV CODE" indicator shows "SERV CODE".

   3. 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, the "SERV CODE" remains ON. If the switch is the cause of the diagnostic code, the "SERV CODE" goes OFF.

      Expected Results: The "SERV CODE" goes OFF.

      Results:

      • OK - The "SERV CODE" goes OFF. The switch has failed. Replace the switch and verify that the new switch corrects the problem. STOP.

      • NOT OK - The "SERV CODE" remains ON. Proceed to 3.

3. CHECK IF THE DIAGNOSTIC CODE REMAINS.

   1. Inspect the contacts and clean the contacts of the harness connectors.

   2. Reconnect all harness connectors.

   3. Turn the disconnect switch and the key start switch to the ON position.

   4. Enter the service mode of the Caterpillar Monitoring System and clear all inactive diagnostic codes.

   5. Attempt to operate the machine in all gears. All gears may not be available.

   6. Stop the machine and engage the parking brake.

   7. Observe the status of CID 0602 FMI 04 for the switch. The "SERV CODE" is showing or the "SERV CODE" is NOT showing.

      Expected Results: The CID 0602 FMI 04 is NOT present. The "SERV CODE" is NOT showing.

      Results:

      • OK - The "SERV CODE" is NOT showing. The diagnostic code has been corrected. Resume normal machine operation. STOP.

      • NOT OK - The "SERV CODE" is showing. The diagnostic code has NOT been corrected. Exit this procedure and perform this procedure again. If the cause of the diagnostic code is NOT found, replace the ECM. See Testing And Adjusting, "Electronic Control Module (ECM) - Replace". STOP.