END-WIRE 1108714 - Caterpillar

Illustration 2 g06108335
Operator Control Switch (Switch To Ground) - Test Switches
Note: The diagram above is a simplified schematic of the electrical circuit. The schematic is electrically correct. However, not all the possible harness connectors are shown. Refer to the latest revision of the Electrical Schematic, UENR7702 for the complete schematic.Diagnostic Trouble Code Procedure
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. For sensors powered via the fuse panel, check the condition of the appropriate fuse before beginning the troubleshooting procedure.
Table 4
Troubleshooting Test Steps Values Results
1. Identify Active FMI Code Associated With The Switch Circuit Code present. FMI 03 diagnostic code, proceed to Test Step 2.
FMI 04 diagnostic code, proceed to Test Step 7.
Begin Process For FMI 3 Troubleshooting Here
2. Check the Harness For an Open
A. Turn key start switch and disconnect switch OFF.
B. Disconnect the switch from the machine harness.
C. Disconnect the J1 and J2 machine harness connector.
D. At the machine harness connector for the switch, place a jumper wire between the signal contact and frame ground.
E. At the machine harness connector for the ECM, measure the resistance between the signal contact and frame ground.
The resistance is less than 5 Ω. OK: The circuit is correct.
Proceed to Test Step 3.
NOT OK: The resistance is greater than 5K Ω. The circuit is open.
REPAIR: Repair or replace the machine harness.
A resistance that is greater than 5 Ω but less than 5K Ω indicates a loose connection or a corroded connection in the circuit. A resistance measurement that is greater than 5K Ω indicates an open in the circuit.
Proceed to Test Step 10.
3. Check the Harness for a Short
A. The keyswitch remains OFF.
B. All harness connectors remain disconnected.
C. Remove the jumper wire installed in the previous step.
D. At the machine harness connector for the ECM, measure resistance between the signal contact and all other contacts used in the J1 and J2 harness connectors.
The resistances are greater than 5K Ω.