ADAPTER 8B7556 - Caterpillar

Illustration 1 g02746897
Schematic of the Master Fault LampThis diagnostic code is recorded when the ECM reads the voltage of the circuit for the Master Fault Lamp and the current is above normal. The Master Fault Lamp does not light as a result of this diagnostic code. The schematic that is shown above represents a typical installation of the component. Verify the connector contact and wire numbers by using the Electrical System Schematic for the machine that is being serviced.Test Step 1. CHECK THE LAMP.
At the Master Fault Lamp, disconnect wire 411-PK from the lamp socket.Expected Result:The CID 0324 FMI 06 is present. Results:
OK - The CID 0324 FMI 06 is present. The Master Fault Lamp is not causing the diagnostic code. Proceed to test step 2.
NOT OK - The CID 0324 FMI 06 is NO longer present. The lamp or the lamp socket has failed. The correct resistance for a lamp is greater than 10 ohms.Repair: Replace the Master Fault Lamp.STOPTest Step 2. CHECK THE HARNESS.
Turn the disconnect switch to the OFF position.
Wire 411-PK remains disconnected from the Master Fault Lamp.
Disconnect the machine harness from the ECM.
At the machine harness connector for the ECM, measure the resistance between contact 13 (411-PK) and frame ground.Expected Result:The resistance is greater than 5000 ohms.Results:
OK - The resistance is greater than 5000 ohms. The harness resistance is correct. Proceed to test step 3.
NOT OK - The resistance is less than 5000 ohms. The harness has failed.Repair: Repair the machine harness or replace the machine harness.STOPTest Step 3. CHECK THE ECM.
Remove contact 13 from the machine harness connector for the ECM.
Reconnect the harness connector to the ECM.
Turn the disconnect switch and the key start switches to the ON position.
Place the same diagnostic code on hold. Check the service code indicator.Expected Result:The CID 0324 FMI 06 is present.Results:
OK - The CID 0324 FMI 06 remains present. The ECM has failed.Repair: An ECM failure is unlikely. Exit this procedure and perform this procedure again. Also, recheck if the diagnostic code indicator is illuminated for this diagnostic code. If the cause of the diagnostic code is not found, replace the ECM. See Troubleshooting, "Main Display Module - Replace".STOP
NOT OK - The diagnostic code is NO longer active. The diagnostic code does not exist at this time. The initial diagnostic code may have been caused by a poor electrical connection that was corrected when a harness connector was disconnected and reconnected. Resume normal machine operationSTOP