ENGINE AR-COMPLETE 2484680 - Caterpillar

Illustration 1 g02638020
Schematic of the "Variable Fan Speed Control" SolenoidThis diagnostic code is associated with the "Variable Fan Speed Control" Solenoid. The FMI 03 means that the ECM has determined that the voltage of the solenoid circuit is above normal. The solenoid is within the "ATCH Viscus Clutch".The possible causes of this diagnostic code are listed below:
The energize circuit of the solenoid is shorted to the +battery circuit.
The ECM has failed. ECM failure is unlikely.Note: The Machine ECM is equipped with LED indicators that serve as a self-diagnostic check. With the key start switch ON, the following can be determined by the ECM indicator lights:
If all of the LED lights are Off, voltage is not being supplied to the Machine ECM. Check for power to the ECM.
If the yellow LED is Flashing, a communication error exists on the "CAN" data-link circuit.
If the yellow LED is constantly On, the Machine ECM software may be missing / not loaded.
If the red LED is Flashing, the Machine ECM has failed and may need replacement. Before performing this procedure, inspect the harness connectors that are involved in the circuit. Poor connections can often be the cause of a problem in an electrical circuit. Verify that all connections in the circuit are clean, that all connections are secure and that all connections are in good condition. If a problem with a connection is found, correct the problem and verify that this diagnostic code is active before performing this procedure.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 0291 FMI 03 is active before performing this procedure.Note: Use a Digital Multimeter for the measurements in the procedure.System Response:A level 1 warning will be generated.Test Step 1. CHECK THE SOLENOID CIRCUIT FOR A SHORT TO THE +BATTERY
Turn the key start switch and the disconnect switch ON.Note: Use a wire removal tool to remove the appropriate wires from the machine harness connector for the ECM.
Remove the wire for the solenoid signal (H746-YL) of the connector contact J1-7 for the Machine ECM.
Measure the voltage from the wire for the solenoid signal (H746-YL) to frame ground.
Remove the wire for the solenoid return (A209-BK) of the connector contact J2-18 for the Machine ECM.
Measure the voltage from the wire for the solenoid return (A209-BK) to frame ground.Expected Result:The voltage is 0 VDC.Results:
OK - The voltage is 0 VDC. There are no shorts in the wires. Proceed to Test Step 2.
NOT OK - There is the presence of a voltage in a wire. The short is in the wire with a measured voltage. The machine harness has failed.Repair: Repair the machine harness or replace the machine harness.STOPTest Step 2. CHECK IF THE DIAGNOSTIC CODE REMAINS
Inspect the contacts of the harness connectors. Clean the contacts of the harness connectors.Reference
Testing and Adjusting, "Electrical Connector - Inspect"
Reconnect all harness connectors.
Turn the disconnect switch and the key start switch