966G Wheel Loader and 972G Wheel Loader Power Train Caterpillar

CID 0444 FMI 05 Magnetic Switch (Start Relay) Current Below Normal - Test

Usage:

972G 1EW

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Illustration 1	g00436098
Start Relay Magnetic Switch Schematic

CID 0444 FMI 05 service code is recorded when the power train electronic control module (ECM) reads the current of the start relay circuit as below normal (open circuit).

Note: Ensure that the service code CID 0444 FMI 05 for the start relay is active. Before performing this procedure, refer to table 1 in order to determine the connector contact number and the wire number that corresponds to the failed circuit.

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Table 1
Relay Information
Fault	Connector Contact No.	Wire No.
Starter Relay	J1-8 ⁽¹⁾	306-GN

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^( 1 )

Connector contact number of the power train ECM.

Note: All start relay return lines are joined and connect to contacts J1-7 and J2-3 (wire 975-WH) of the power train ECM.

Note: The approximate coil resistance of the start relay is 15 to 65 Ohms.

Check the resistance of the start relay.
1. Turn the key start switch and the disconnect switch to the OFF position.
1. Disconnect the machine harness from the suspected start relay.
1. At the start relay, measure the resistance between the two contacts of the start relay connector.
  Expected Result: The resistance should be between 15 - 65 ohms.
  Results:
  - OK - The start relay resistance is correct. Either the wire for start relay signal or the start relay return circuit (wire 975-WH) is open in the harness. Reconnect the start relay and go to Step 2.
  - NOT OK - The start relay is failed. Replace the start relay. STOP.

Check the start relay circuit for an open.
1. The key start switch and the disconnect switch remain in the OFF position.
1. Disconnect the machine harness connectors J1 and J2 from the power train ECM.
1. At machine harness connector J1 or J2, measure the resistance from the start relay signal contact (refer to table 1) to J2-3 (return) or J1-7 (return).
  Expected Result: The resistance should be between 15 - 65 ohms.
  Results:
  - OK - The machine harness circuit resistance is correct. Suspect an intermittent fault. Go to Step 3.
  - NOT OK - Resistance is not correct. The open is in the wire for the start relay signal or in wire 975-WH of the machine harness. Check continuity on each of the circuits. Repair the machine harness or replace the machine harness. STOP.

Check if the fault is still present.
1. Inspect the contacts and clean the contacts of the harness connectors.
1. Reconnect all harness connectors.
1. Turn the disconnect switch and the key start switch to the ON position.
1. Operate the machine. See if the fault reappears.
1. Check to see if the CID 0444 FMI 05 service code for the start relay has recurred.
  Expected Result: The CID 0444 FMI 05 for the start relay is active.
  Results:
  - YES - The fault has not been corrected. It is unlikely that the power train ECM is faulty. Perform the previous steps again. If the cause of the fault is not found, replace the power train ECM. Refer to Testing and Adjusting, "Electronic Control Module (Power Train) - Replace" for more information on replacing the power train ECM. STOP.
  - NO - Fault is NOT active. The fault does not exist at this time. The initial fault was probably caused by a poor electrical connection or a short at one of the harness connectors that was disconnected and reconnected. Resume normal machine operation. STOP.