GASKET 2916531 - Caterpillar

Illustration 1 g02146017
Connections of the main power relay
This diagnostic code is associated with the main power relay. The FMI 03 means that the ECM has determined that voltage is present in the relay circuit when the output driver is OFF.The possible causes of the diagnostic code are listed below:
The relay has failed.
The power circuit of the relay is shorted to another voltage source.
The ECM has failed. An ECM failure is unlikely.Note: Before performing this procedure, inspect the harness connectors that are involved in the circuit. Poor connections can often be the cause of a problem in an electrical circuit. Verify that all connections in the circuit are clean, that all connections are secure and that all connections are in good condition. If a problem with a connection is found, correct the problem and verify that this diagnostic code is active before performing this procedure. Note: The following test procedure may cause other diagnostic codes to activate. Ignore these created diagnostic codes and clear these diagnostic codes when the original problem has been corrected.Test Step 1. Check the relay
Turn the key start switch and the disconnect switch to the OFF position.
Disconnect the machine harness connector from the relay.
At the connector for the relay, measure the resistance of the coil between contact "1" and contact "2". Expected Result:The resistance of the relay coil should measure approximately 50 5 ohms at 25° C (77° F). Results:
YES - The resistance measurement of the relay coil is within the acceptable range. Proceed to Test Step 2.
NO - The resistance measurement of the relay coil is not within the acceptable range.Repair: The relay coil is not correct. Replace the relay. After the relay has been replaced, verify that the new relay corrected the problem before operating the machine.STOPTest Step 2. Check the energize circuit of the relay for a shortThe key start switch and the disconnect switch remain in the OFF position. The machine harness connector remains disconnected from the relay.
Disconnect the J1 and J2 harness connectors from the ECM.
At the machine harness connector for the ECM, measure the resistance from contact J2-2 wire (308-YL(Yellow)) to all of the contacts that are used in the machine harness connectors for the ECM. Expected Result:Each resistance measurement is greater than 5000 ohms.Results:
YES - Each resistance measurement is greater than 5000 ohms. The machine harness is correct. Proceed to Test Step 3.
NO - Each resistance measurement is not greater than 5000 ohms. There is a short in the machine harness. The short is between wire (308-YL(Yellow)) and the circuit that has a low resistance measurement. Repair: Refer to Electrical System Schematic, KENR8916. Examine all of the connectors for possible locations of a short. For information on testing for short circuits and finding short circuits, refer to Troubleshooting, "Wiring Harness (Short Circuit) - Test". Repair the machine harness or replace the machine harness.STOPTest Step 3. Check the status of the diagnostic code
Inspect the harness connectors. Clean the contacts of the harness connectors and check the wires for damage