COLLAR 1592961 - Caterpillar

Illustration 1 g03729177
Schematic of the auxiliary hydraulics high flow diverter solenoid circuit This diagnostic code is associated with the high (boost) flow diverter solenoid. The FMI 03 means that the ECM determined that the voltage is above normal. A short to the + battery terminal will cause this code.Test Step 1. CHECK FOR A SHORT TO + BATTERY IN THE WIRE HARNESS
Turn the key start switch to the OFF position.
Remove the floorplate in order to get to the ECM.
Disconnect the wire harness from the ECM.
Measure the resistance from contact 24 (wire P980-OR) to the following contacts of the wiring harness: contact 1, contact 5, contact 58, contact 26 and contact 40.Expected Result:The resistances should be greater than 5000 Ohms.Results:
OK - The resistances were greater than 5000 Ohms. The machine harness is correct. Proceed to Test Step 2.
NOT OK - The resistances were less than 5000 Ohms on one of the readings.Repair: There is a short in the wire harness. Locate the short. Repair the wire harness or replace the wire harness.STOPTest Step 2. CHECK IF THE DIAGNOSTIC CODE REMAINS
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, battery acid, or chafing. Refer to Testing and Adjusting, "Electrical Connector - Inspect" in this manual.
Perform a 45 N (10 lb) pull test on each of the wires that are associated with the circuit.
Reconnect all of the harness connectors in order to make sure that the connectors are fully seated. Also, make sure that the clips for each connector are fastened.
Turn the disconnect switch and the key start switch to the ON position and operate the machine.
Check the status of the CID 1940 FMI 03.Expected Result:The CID 1940 FMI 03 is active.Results:
YES - The CID 1940 FMI 03 is active. The diagnostic code has not been corrected.Repair: The ECM is unlikely to have failed. Exit this procedure and perform this procedure again. If the cause of the diagnostic code is not found, replace the ECM. Prior to replacing an ECM, contact the dealership Technical Communicator (TC) for possible consultation with Caterpillar. This consultation may greatly reduce repair time. See Testing and Adjusting, "Electronic Control Module (ECM) - Replace ". STOP
NO - The CID 1940 FMI 03 is not active. The problem does not exist at this time.Repair: The initial code was probably caused by a poor electrical connection or a shorted harness connector that was disconnected and reconnected. Resume normal machine operation. STOP