HOUSING AS-DRIVE 5T8058 - Caterpillar

Illustration 1 g06012632
Transmission ECM J2 Relay connections
Note: The diagram above is a simplified schematic of the Transmission ECM connections. The schematic is electrically correct. However, not all the possible harness connectors are shown. For the latest version of schematic, refer to Electrical Schematic, UENR5399, "994K Wheel Loader Electrical System".Diagnostic Trouble Code Procedure
Note: Prior to beginning this procedure, inspect the harness connectors that are involved in the circuit. Poor connections can often be the cause of a problem in an electrical circuit. Verify that all connections in the circuit are clean, secure and in good condition. If a problem with a connection is found, correct the problem and verify that this diagnostic code is active before performing this procedure.
Table 2
Troubleshooting Test Steps Values Results
1. Identify Active FMI Code Associated With Relay Circuit
Code present. FMI 3 diagnostic code, proceed to Test Step 2.
FMI 5 diagnostic code, proceed to Test Step 3.
FMI 6 diagnostic code, proceed to Test Step 6.
Begin Process For FMI 3 Troubleshooting HERE
2. Check The Machine Harness For A Short
A. Turn key start switch and disconnect switch to the OFF position.
B. Disconnect harness connection at the relay.
C. Disconnect the J1 and J2 connectors from the ECM.
D. Measure resistance between relay signal contact and all J1 and J2 connectors.
Each reading is greater than 5KΩ. OK - All resistance measurements are greater than 5K Ω.
Proceed to Test Step 8.
NOT OK - One or more of the readings are less than 5 Ω.
Repair: A short exists between the signal contact and the circuit with the low resistance. Repair or replace the machine harness.
Note: A resistance greater than 5 Ω but less than 5KΩ indicates a loose or a corroded connection in the circuit. A resistance measurement greater than 5K Ω indicates an open in the circuit.
STOP
Begin Process For FMI 5 Troubleshooting HERE
3. Check The Harness For An Open
A. The key start switch and disconnect switch are in the OFF position.
B. Disconnect the relay from the wiring harness. Install a jumper wire from the signal to return contacts in place of the relay.
C. Disconnect J1 and J2 connectors from the ECM.
D. Review the electrical schematic (above) to identify the signal and return wires for the relay.
E. Use a multimeter to measure the resistance From the signal to return wire on the ECM harness.
The resistance of the harness is less than 5 Ω. OK - The harness resistance is less than 5 Ω.
Proceed to Test Step 4.
NOT OK - The resistance is greater than 5K Ω. The harness is open.
Repair: Replace or repair the harness.
Note: After the harness is replaced, confirm that the diagnostic code is no longer active.
Note: A resistance greater than 5 Ω but less than 5K Ω indicates a loose or corroded connection in the circuit. A resistance measurement greater than 5K Ω indicates an open in the circuit.
STOP
4. Check The Relay
A. The machine harness remains disconnected from the ECM.
B. Turn key start switch and disconnect switch to the OFF position.
C. Reconnect the relay back into the harness.
D. At the harness