TURBOCHARGER GP 4451673 - Caterpillar

Illustration 1 g01319590
Connections of the start relayThis diagnostic code is associated with the start relay. The FMI 05 means that the ECM has determined that an open in the circuit exists. The possible causes of this diagnostic code are listed below:
The energize circuit of the relay is open.
The return circuit of the relay is open.
The relay has failed.
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 CID 0444 FMI 05 is active before performing this procedure.Note: Use a digital multimeter for the measurements in this procedure.Test Step 1. CHECK THE RELAY.
Turn the disconnect switch and the key start switch to the ON position. Do not start the engine.
Disconnect the relay with the active diagnostic code from the machine harness.
At the machine harness connector for the relay, place a jumper wire from contact 1 (wire 306-GN) to contact 2 (wire E790-PK).
Observe the status of the CID 0444 FMI 05.Expected Result:The diagnostic code is active. Then, the diagnostic code changes from FMI "05" to FMI "06" as the jumper wire is installed.Results:
YES - The diagnostic code remains active. The jumper wire does not affect the diagnostic code. Proceed to Test Step 2.
NO - The diagnostic is no longer active. The relay has failed.Repair: The relay has failed. Replace the relay. Verify that the new relay corrects the problem.STOPTest Step 2. CHECK THE HARNESS FOR AN OPEN.
Turn the key start switch and the disconnect switch to the OFF position.
Disconnect the machine harness connector(s) from the ECM.
The jumper wire that was installed in the previous Test Step remains in place.
At the machine harness connector, measure the resistance from signal contact J2-7 (wire 306-GN) to contact J2-22 (wire E790-PK).Expected Result:The resistance is less than 5.0 ohms.Results:
OK - The resistance is less than 5.0 ohms. The machine harness is correct. Proceed to Test Step 3.
NOT OK - The resistance is greater than 5000 ohms. The resistance measurement is not correct. There is an open circuit in the machine harness.Repair: Repair the machine harness or replace the machine harness.STOPTest Step 3. CHECK IF THE DIAGNOSTIC CODE REMAINS.
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, battery acid, or chafing.
Perform a 45 N (10 lb) pull test on each of the wires that are associated with the circuit.
Reconnect all harness connectors in order to make sure that the connectors are fully seated. Also, make sure that the clips for each connector are completely fastened.
Turn the disconnect switch and the key start switch to the ON position.
Operate the machine.
Check the status of the CID 0444 FMI 05.Expected Result:The CID 0444 FMI 05 is active.Results:
YES - The CID 0444 FMI 05 is active. The diagnostic code has not been corrected.Repair: Check the circuit again. If the Caterpillar Electronic Technician (Cat ET)