HOUSING-AXLE 2064549 - Caterpillar

Illustration 1 g01644953
Schematic for the 8 volt power supplyThis diagnostic code is recorded when the ECM reads the voltage of the 8 volt DC supply circuit (wire R800-OR) and the voltage is below normal.Note: Ensure that the CID 0041 FMI 03 is active. This diagnostic code will generate codes for the components that receive 8 volt power.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 0041 FMI 04 is active before performing this procedure.Note: Use a digital multimeter for the measurements in this procedure.System Response: When this diagnostic code is active, a Level 2 Warning will occur.Components that receive power from the 8 volt DC supply will not be available.Test Step 1. CHECK THE STATUS OF THE DIAGNOSTIC CODE
Inspect the harness connectors. Clean the contacts of the harness connectors. Check the wires for damage to the insulation that is caused by excessive heat, corrosion, 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 making sure that the connectors are fully seated and the clips for each connector are completely fastened.
Use the Caterpillar Electronic Technician (ET) service tool, if available, in order to perform a "Wiggle Test" on the machine wiring harness. The wiggle test can detect intermittent shorts or opens in the machine wiring harness.
Turn the disconnect switch and the key start switch to the ON position.
Operate the machine.
Determine if the CID 0041 FMI 04 diagnostic code is active.Expected Result:The CID 0041 FMI 04 diagnostic code is active.Results:
YES - The CID 0041 FMI 04 diagnostic code is active. The problem has not been corrected. Proceed to Test Step 2.
NO - The CID 0041 FMI 04 diagnostic code diagnostic code is not active. The problem does not exist at this time.Repair: The initial diagnostic code 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.STOPTest Step 2. CHECK FOR A SHORT TO GROUND.
Turn the disconnect switch and the key start switch to the OFF position.
Disconnect any sensor that uses the 8 volt DC supply voltage from the machine harness. See the entire electrical schematic in order to determine the sensors that are connected to the 8 volt sensor supply.
At the harness connector for the ECM, measure the resistance between frame ground and contact J1-44 of the 8 volt DC supply circuit and to all other J1 and J2 contacts.Expected Result:The resistance is greater than 5000 ohms.Results:
OK - The resistance is greater than 5000 ohms. The harness circuit resistance is correct. Proceed to Test Step 3.
NOT OK - The resistance is less than 5000 ohms. The machine harness is shorted to ground when the resistance is less than 5000 ohms and all of the sensors are disconnected from the machine harness.Repair: Repair the machine harness