VALVE GP-PRESSURE REDUCING 6E4286 - Caterpillar

Illustration 1 g01237428
Schematic of the reversible steering solenoid valveThis diagnostic code is associated with the reversible steering solenoid valve. The FMI 06 means that the Power Train ECM has determined that the current of the solenoid is above normal. The possible causes of this diagnostic code are:
The energize circuit of the solenoid is shorted to ground.
The solenoid has failed.
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 1077 FMI 06 is active before performing this procedure.Note: Use the 146-4080 Digital Multimeter for the measurements in this procedure.System Response:When this diagnostic code occurs, the reversible steering function is inoperable.Test Step 1. CHECK THE SOLENOID
Turn the disconnect switch and the key start switch to the ON position. Do not start the engine.
Observe the status of the diagnostic code.
Disconnect the solenoid from the machine harness. Expected Result:CID 1077 FMI 06 changes to CID 1077 FMI 05 when the solenoid is disconnected.Results:
YES - CID 1077 FMI 06 changes to CID 1077 FMI 05 when the solenoid is disconnected. The circuit is correct.Repair: The solenoid has failed. Repeat this test "CHECK THE SOLENOID" in order to verify the solenoid failure. Replace the solenoid.STOP
NO - CID 1077 FMI 06 remains active. Proceed to Test Step 2.Test Step 2. CHECK THE ENERGIZE CIRCUIT OF THE SOLENOID FOR A SHORT TO GROUND
Turn the key start switch and the disconnect switch to the OFF position.
The solenoid remains disconnected from the machine harness.
Disconnect the machine harness connector(s) from the ECM.
At the machine harness connector, measure the resistance from the signal contact J1-68 (wire H899-GY) to all contacts that are used in the machine harness connectors for the ECM. Expected Result:Each resistance measurement is greater than 5 ohms.Results:
YES - Each resistance measurement is greater than 5 ohms. The machine harness is correct. Proceed to Test Step 3.
NO - Each resistance measurement is not greater than 5 ohms. There is a short in the machine harness. The short is between J1-68 (wire H899-GY) and the circuit with the low resistance measurement.Repair: Repair the machine harness or replace the machine harness. STOPTest Step 3. CHECK IF THE DIAGNOSTIC CODE REMAINS
Inspect the harness connectors and clean the contacts of the harness connectors.
Reconnect all harness connectors.
Turn the disconnect switch and the key start switch to the ON position.
Operate the machine.
Check the status of the CID 1077 FMI 06. Expected Result:The CID 1077 FMI 06 is active. Results:
YES - The CID 1077 FMI 06 is active. The diagnostic code has not been corrected. The ECM may have failed.Repair: It is unlikely that the ECM has failed. Exit this procedure and perform this procedure again. If the cause of the diagnostic code is not found, replace the ECM. Refer to Troubleshooting, Testing and Adjusting, "Electronic Control Module (ECM) - Replace". STOP
NO - The CID 1077 FMI 06 is not active. The diagnostic code