HUB 1626336 - Caterpillar

Machine ECM
The following is a list of Diagnostic Trouble Codes (DTCs) that are associated with the travel alarm circuit of the machine.
Table 1
Machine ECM (MID 299)
DTC Code Description System Response
376-3 Travel Alarm : Voltage Above Normal The ECM will prevent the operator from engaging the machine in the reverse direction.
376-5 Travel Alarm : Current Below Normal The ECM will prevent the operator from engaging the machine in the reverse direction.
376-6 Travel Alarm : Current Above Normal The ECM will prevent the operator from engaging the machine in the reverse direction. Possible causes for an FMI 3 diagnostic code are:
The travel alarm is shorted to a + battery source.
The Machine ECM has failed. A failure of the ECM is unlikely.Possible causes for an FMI 5 diagnostic code are:
The energize circuit of the travel alarm is open.
The return circuit of the travel alarm is open.
The travel alarm has failed.
The Machine ECM has failed. A failure of the ECM is unlikely.Possible causes for an FMI 6 diagnostic code are:
The travel alarm circuit is shorted to ground
The travel alarm has failed.
The Machine ECM has failed. A failure of the ECM is unlikely.
Illustration 1 g03436676
Travel Alarm Circuit
Note: The diagram above is a simplified schematic of the Travel Alarm connections. The schematic is electrically correct. However, not all of the possible harness connectors are shown. Refer to the latest revision of Electrical Schematic, UENR2487 (374F) or Electrical Schematic, UENR2489 (390F) for the complete schematic.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.
Table 2
Troubleshooting Test Steps Values Results
1. Identify The Active FMI Code Associated With The Solenoid 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 5.
Begin Process For FMI 3 Troubleshooting HERE
2. Check The Signal Circuit For A Short
A.