RING 5L4380 - Caterpillar

MID 087 - Chassis ECMCID 0444 - Starter Motor RelayFMI 03 - Voltage Above Normal
Illustration 1 g01689526
Starter relay
Illustration 2 g02737796
Starter relay circuit
This diagnostic code indicates the Chassis ECM detects the starter motor relay voltage is above normal.The following can cause this code:
One or both relays failed
Relay shorted to +battery
ECM failedNote: The following test procedure may create other diagnostic codes. Ignore these created codes and clear these created codes after the original diagnostic code has been corrected. Ensure diagnostic code CID 0444 FMI 03 is active before performing this procedure.Note: Use a calibrated digital multimeter for this procedure.System Response:The ECM turns off the current to the relays.Test Step 1. CHECK FOR A SHORT TO THE +BATTERY CIRCUIT
Turn off the keyswitch and the disconnect switch.
Disconnect the harness from the relays and the ECM.
At the harness connector for the ECM, measure the resistance from contact J2-7 (wire P989-GN(Green)) to all contacts used in the harness connectors for the ECM. Expected Result:Each resistance is greater than 5000 ohms.Results:
OK - Each resistance is greater than 5000 ohms. Proceed to Test Step 2.
NOT OK - A resistance is less than 5000 ohms. There is a short between J2-7 (P989-GN(Green)) and the circuit with low resistance. Repair: Repair or replace the harness.STOPTest Step 2. CHECK THE DIAGNOSTIC CODEThe keyswitch and the disconnect switch remain off.
Inspect the harness. Clean the harness connector contacts.Inspect the harness connector contacts for corrosion or damage. Inspect the wire insulation for damage caused by heat, corrosion, or chafing.
Perform a 45 N (10 lb) pull test on each circuit wire.
Reconnect all harness connectors. Verify that the connectors are fully seated and the clips are fastened.
Check for intermittent problems. Using Cat® Electronic Technician (Cat ET), perform a wiggle test on the harness.
Turn on the disconnect switch and the keyswitch.
Operate the machine.
Check the CID 0444 FMI 03 status. Expected Result:CID 0444 FMI 03 is not active.Results:
OK - CID 0444 FMI 03 is not active.Repair: The initial diagnostic code was probably caused by a poor connection at one of the connectors that was checked. Resume normal operation.STOP
NOT OK - CID 0444 FMI 03 is active. The ECM may have failed.Repair: Exit this procedure and perform this procedure again. Contact your technical communicator. If the ECM requires replacement, see Testing and Adjusting, "Electronic Control Module (ECM) - Replace".STOP