FAN GP 4661851 - Caterpillar

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Left Steering Pump Solenoid connections
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Location of the left steering pump solenoidThis diagnostic code is associated with the Left Steering Pump Solenoid. The Machine ECM will use a PWM output driver in order to control the solenoid. The FMI 06 means that the Machine ECM has determined that the current of the solenoid circuit is above normal.Conditions that could causes this diagnostic code to be activated are:
The energize circuit of the solenoid is shorted to a ground source.
The solenoid has failed.
The ECM has failed. This is unlikely. Poor connections can often be the cause of a problem in an electrical circuit. Verify that all connections in the circuit are clean, secure and 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. Note: The resistance of a good solenoid coil should be 8.7 0.4 ohms at 25 °C (77.0 °F).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 with the active diagnostic code from the machine harness. Expected Result:The active CID 0727 FMI 06 diagnostic code changes to a CID 0727 FMI 05 diagnostic code when the solenoid is disconnected.Results:
YES - The active CID 0727 FMI 06 diagnostic code changes to a CID 0727 FMI 05 diagnostic code 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 - The CID 0727 FMI 06 remains active when the solenoid is disconnected. The solenoid is not causing the problem. Proceed to Test Step 2.Test Step 2. CHECK THE ENERGIZE CIRCUIT OF THE SOLENOID FOR A SHORT TO GROUNDThe solenoid remains disconnected from the machine harness.
Turn the key start switch and the disconnect switch to the OFF position. DO NOT START THE ENGINE.
Disconnect the machine harness connectors J1 and J2 from the Machine ECM.
At the machine harness ECM connectors, measure the resistance from the contact J1-67 (wire F788-PU) to frame ground. Measure the resistance from the contact J1-67 (wire F788-PU) to all of the other J1 and J2 contacts that are used in the Machine ECM connectors.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 3.
NOT OK - One or more of the resistance measurements is less than 5000 ohms. There is a short in the machine harness. The short is between wire F788-PU and the circuit with the low resistance measurement. Repair: Check all of the connectors that are in the circuit. Ensure that all of the contacts for the circuit are in good