HOUSING 3648247 - Caterpillar

MID 87 - Chassis ECMCID 444 - Starter Motor RelayFMI 6 - Current Above Normal
Illustration 1 g01689526
"Starter" relay
Illustration 2 g02737796
Schematic of the "Starter" relay
This diagnostic code indicates the "Chassis ECM" detects the "Starter Motor" relay current is above normal.The following can cause this code:
Relay energizer circuit shorted to ground
Relay failed
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 444 FMI 6 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 relay.Test Step 1. CHECK THE RELAY
Turn on the disconnect switch and the key switch.
Observe the status of the diagnostic code.
Disconnect the relays from the harness.Expected Result:CID 444 FMI 6 changes to CID 444 FMI 5.Results:
OK - CID 444 FMI 6 changes to CID 444 FMI 5. A relay has failed.Repair: Replace the failed relay.STOP
NOT OK - CID 444 FMI 6 does not change to CID 444 FMI 5. Proceed to Test Step 2.Test Step 2. CHECK THE RELAY ENERGIZER CIRCUIT FOR A SHORT TO GROUNDThe relays remain disconnected from the harness.
Turn off the key switch and the disconnect switch.
Disconnect the harness from the ECM.
At the harness connector for the ECM, measure the resistance from the signal contact J2-7 (wire P989-GN(Green)) to all contacts in the ECM harness connectors.Expected Result:Each resistance is greater than 5000 ohms.Results:
OK - Each resistance is greater than 5000 ohms. Proceed to Test Step 3.
NOT OK - A resistance is less than 5000 ohms. There is a short between J2-7 (wire P989-GN(Green)) and the circuit with low resistance.Repair: Repair or replace the harness.STOPTest Step 3. CHECK THE DIAGNOSTIC CODEThe key switch and the disconnect switch remain in the off position.
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 key switch.
Operate the machine.
Check the CID 444 FMI 6 status.Expected Result:CID 444 FMI 6 is not active.Results:
OK - CID 444 FMI 6 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 444 FMI 6 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