AIR COMPRESSOR GP 1W5840 - Caterpillar

Illustration 1 g01737635
Schematic for the Lift Relays
This diagnostic code is associated with the Lift Relays. The FMI 6 means that the ECM has determined that the current of the relay circuit is above normal.The possible causes of the diagnostic code are listed:
The energize circuit of the relay is shorted to ground.
A wire of the controller harness is shorted to ground.
The ECM has failed. This is unlikely.Note: The following test procedure may create other diagnostic codes. Ignore these created diagnostic codes and clear these diagnostic codes when the original diagnostic code has been corrected. Ensure that the diagnostic code of SPN 5013 FMI 6 is active before performing this procedure.Note: Use the 146-4080 Digital Multimeter for the measurements in this procedure.System Response:The machine response is listed:
The Lift Relays may not turn ON.
Machine performance may not lift material properly if material is lifted at all.Note: Before performing this procedure, verify that all circuit breakers and fuses in the charging circuit and the ECM system supply circuit are closed. If a problem with a circuit breaker or a fuse is found, correct the problem and verify that this diagnostic code is active before performing this procedure.Test Step 1. CHECK THE STATUS OF THE DIAGNOSTIC CODE
Turn the disconnect switch and the key start switch to the OFF position.
Inspect the harness connectors. Clean the contacts of the harness connectors and check the wires for damage to the insulation that is caused by excessive heat, corrosion, or chafing.
Perform a 45 N (10 lb) pull test on each of the wires that are associated with the circuit.
Use the Caterpillar Electronic Technician (ET) service tool, if available, in order to perform a “Wiggle Test” on the machine wiring harness. The wiggle test can detect intermittent shorts or opens in the machine wiring harness.
Reconnect all harness connectors. Make sure that the connectors are fully seated and the clips for each connector are completely fastened.
Turn the disconnect switch and the key start switch to the ON position.
Operate the machine.
Determine if the SPN 5013 FMI 6 diagnostic code is still active. Expected Result:The SPN 5013 FMI 6 diagnostic code is still active.Results:
YES - The SPN 5013 FMI 6 diagnostic code remains active. Proceed