PLATE 1885141 - Caterpillar

Table 4
FMI 4 Troubleshooting
Troubleshooting Test Steps Values Results
1. Check The Battery Voltage
A. Start the engine and run the engine at high idle for several minutes.
B. Measure the voltage of the battery at the battery posts.
The voltage is within range of system voltage. OK - The voltage is within range of system voltage.
Proceed to Test Step 2.
NOT OK - The voltage is not within the range of system voltage.
Repair: Refer to Special Instruction, REHS0354.
Proceed to Test Step 3.
2. Check The System Voltage At The ECM.
A. The engine remains running at high idle.
B. Do not disconnect the machine harness from the ECM.
C. Use the 7x-1710 Multimeter Probe to measure the voltage between the supply contacts and ground contacts.
The voltage is within range of system voltage. OK - The voltage is within range of system voltage.
Proceed to Test Step 3.
NOT OK - The voltage is not correct. The machine harness has failed.
Repair: Repair or replace the machine harness.
Proceed to Test Step 3.
3. 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.
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.