FLANGE 5J7028 - Caterpillar

Diagnostic Trouble Code Procedure
Note: Prior to beginning this procedure, inspect the harness connectors that are involved in this 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 the diagnostic code is active before performing a troubleshooting procedure.
Identify the active FMI code associated with the components.
Determine which code is present and use the list below to determine which procedure to follow.
FMI 3 diagnostic code, proceed to Table 2.
FMI 5 diagnostic code, proceed to Table 3.
FMI 6 diagnostic code, proceed to Table 4.
Table 2
FMI 3 Troubleshooting
Troubleshooting Test Steps Values Results
1. Check The Signal Circuit For A Short
A. Turn the key start switch and disconnect switch OFF.
B. Disconnect the harness connectors from the ECM.
C. Disconnect the alarm from the machine harness.
D. At the connector for the ECM, measure the resistance between the alarm contact and all sources for +battery.
Each measurement is greater than 5K Ω. OK - Each measurement is greater than 5K Ω.
Proceed to Test Step 2.
NOT OK - Resistance is less than 5 Ω, a short exists in signal circuit.
Repair: Repair or replace machine harness.
Note: A resistance that is greater than 5 Ω but less than 5K Ω would indicate a loose connection or a corroded connection in the circuit. A resistance measurement that is greater than 5K Ω would indicate an open in the circuit.
Proceed to Test Step 2.
2. Check If The Diagnostic Code Remains
A. Reconnect all harness connectors. Return machine to normal operating condition.
B. Turn the key start switch and the disconnect switch ON.
C. Clear all diagnostic codes.
D. Operate the machine.
E. Stop the machine and engage the safety lock lever.
F. Check if the diagnostic code is active.
The diagnostic code is no longer present. OK - The diagnostic code does not exist at this time. The initial diagnostic code may have been caused by poor electrical connection or short at one of the harness connections. Resume machine operation.
STOP.
NOT OK - The diagnostic trouble code has not been corrected. If the diagnostic code has not been corrected after performing the procedure a second time, the ECM may require replacement.
Prior to replacing the ECM, always contact the Technical Communicator at your dealership for possible consultation with Caterpillar. This consultation may effect repair time.
Follow the steps in Troubleshooting, "ECM - Replace" if the ECM needs to be replaced.
STOP.
Table 3
FMI 5 Troubleshooting
Troubleshooting Test Steps Values Results
1. Check The Alarm
A. Turn the key start switch and the disconnect switch OFF.
B. Disconnect the alarm from the machine harness.
C. Place a jumper wire between contact 1 and contact 2, at the harness connector for the alarm.
D. Turn the key start switch and the disconnect switch ON. Do not start the engine.
The FMI 5 diagnostic code changes to an FMI 6 after the jumper wire is installed. OK - The harness is correct. The FMI 5 diagnostic code changes to an FMI