CORE AS-OIL COOLER 4W9181 - Caterpillar

Illustration 1 g03098816
Schematic of the "Main Pump Flow Limitation Pressure" solenoidThis diagnostic code is associated with the "Main Pump Flow Limitation Pressure" solenoid. The FMI 03 diagnostic code means that the ECM has determined that the voltage of the solenoid circuit is above normal.The possible causes of the diagnostic code are listed below:
The energize circuit of the solenoid is shorted to the +battery circuit.
The ECM has failed. This is unlikely.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 1590 FMI 03 diagnostic code is active before performing this procedure.Note: Use the 146-4080 Digital Multimeter for the measurements in this procedure.Test Step 1. CHECK THE ENERGIZE CIRCUIT OF THE SOLENOID FOR A SHORT TO THE +BATTERY CIRCUIT.
Turn the key start switch and the disconnect switch to the OFF position.
Disconnect the machine harness connectors from the solenoid and the ECM.
At the machine harness connector for the ECM, measure the resistance from contact J2-8 (wire M737-WH) to all contacts that are used in the machine harness connectors for the ECM. Expected Result:Each resistance measurement is greater than 5000 ohms. Results:
OK - Each resistance measurement is greater than 5000 ohms. The machine harness is correct. Proceed to Test Step 2.
NOT OK - Each resistance measurement is not greater than 5000 ohms. There is a short in the machine harness. The short is between J2-8 (M737-WH) and the circuit that has a low resistance measurement. Repair: Repair the machine harness or replace the machine harness.STOPTest Step 2. CHECK THE OPERATION OF THE ECMThe disconnect switch and the key start switch remain in the OFF position. The machine harness connectors for the solenoid and the ECM remain disconnected.
At the harness connector for the Hydraulic Pump ECM J2 use a 151-6320 Removal Tool to remove the wire that energizes the solenoid M737-WH and the wire for the socket at contact J2-8 from the harness connector.
Reconnect the machine harness J1 and J2 connectors to the ECM.
Turn the disconnect switch and the key start switch to the ON position.
Observe the status of the active CID 1590 FMI 03 diagnostic code.Expected Result:The CID 1590 FMI 03 diagnostic code is no longer active. A CID 1590 FMI 05 diagnostic code is now active.Results:
YES - The CID 1590 FMI 03 diagnostic code is no longer active. A CID 1590 FMI 05 diagnostic code is active after the energize circuit of the solenoid is disconnected. The ECM has responded correctly to the open circuit condition in the solenoid circuit.
Reinstall the wire that energizes the solenoid into the correct space in the connector of the ECM before proceeding to the next test step.
Proceed to Test Step 3.
NO - The CID 1590 FMI 03 diagnostic code remains active. The status of the active diagnostic code did not change when the wire that energizes the solenoid was disconnected from the ECM. Repair: The ECM has not responded correctly to