VALVE GP 1237456 - Caterpillar

Illustration 1 g01062668
Schematic of the Continuous Flow Switch.This diagnostic code is associated with the continuous flow switch. The switch is connected to one input of the ECM. The input is Normally Open.The FMI 04 means that the ECM has determined that the Normally Open circuit is shorted to ground. Note: The following test procedure may create other diagnostic codes. Ignore these diagnostic codes and clear these diagnostic codes when the original diagnostic code has been corrected.Ensure that the diagnostic code of CID 1187 FMI 04 is active before performing this procedure.Test Step 1. CHECK THE HARNESS
Turn the disconnect switch and the key start switch to the OFF position.
Disconnect the machine harness from the switch.
Disconnect the machine harness connector(s) from the ECM.
Measure the resistance between contact J1-40 (wire 852-GN) of the machine harness to all the contacts that are used in machine harness connectors for the ECM.Expected Result:Each resistance measurement is greater than 5000 ohms.Results:
YES - Each resistance measurement is greater than 5000 ohms. Proceed to Test Step 2.
NO - One or more of the resistance measurements are less than 5 ohms. The harness has failed. The short is between J1-40 (wire 852-GN) and the circuit with the lowest resistance. Repair: Repair the wiring harness or replace the wiring harness.STOPTest Step 2. CHECK THE OPERATION OF THE SWITCH
The machine harness remains disconnected from the switch.
Connect one lead from a multimeter to contact 3 (wire 852-GN) of the harness connector for the switch.
Connect the other lead from a multimeter to contact 2 (wire J764-BR) of the harness connector for the switch.
Measure the resistance between contact 3 (wire 852-GN) and contact 2 (wire J764-BR). Note the resistance.Expected Result:The resistance from contact 3 (wire 852-GN) to contact 2 (wire J764-BR) is greater than 5000 ohms.Results:
YES - Proceed to Test Step 3.
NO - The resistance from contact 3 (wire 852-GN) to contact 2 (wire J764-BR) is not greater than 5000 ohms. The switch has failed.Repair: Replace the switch.STOPTest Step 3. CHECK THE OPERATION OF THE SWITCH
The machine harness remains disconnected from the witch.
Press and hold the switch.
Connect one lead from a multimeter to contact 3 (wire 852-GN) of the harness connector for the switch.
Connect the other lead from a multimeter to contact 2 (wire J764-BR) of the harness connector for the switch.
Measure the resistance between contact 3 (wire 852-GN) and contact 2 (wire J764-BR). Note the resistance.Expected Result:The resistance from contact 3 (wire 852-GN) to contact 2 (wire J764-BR) is less than 5 ohms. This measurement is opposite of the measurement from the previous Test Step.Results:
YES - The resistance from contact 3 (wire 852-GN) to contact 2 (wire J764-BR) is less than 5 ohms. This measurement is opposite of the measurement from the previous Test Step. The switch is operating correctly. Proceed to Test Step 4.
NO - The resistance measurements have not changed from the previous Test Step. The switch has failed.Repair: Replace the switch.STOPTest Step 4. CHECK IF THE DIAGNOSTIC CODE REMAINS
Inspect the contacts of the harness connectors and clean