BODY PISTON 1P2521 - Caterpillar

Illustration 1 g01281505
Auxiliary Valve 1 Port A Line Relief Pressure Solenoid connectionsThis diagnostic code is associated with the Auxiliary Valve 1 Port A Line Relief Pressure Solenoid (attachment). The FMI 06 means that the Implement Control 2 ECM has determined that the circuit current for the solenoid is above normal.The Auxiliary Valve 1 Port A Line Relief Pressure Solenoid is a proportional solenoid that is controlled by a Implement Control 2 ECM PWM driver output. The solenoid is used to set the line relief pressure for the auxiliary valve ports. In order to control the solenoid, the ECM will change the current of the PWM output signal for the solenoid. This solenoid can be overridden in Cat ET.Conditions that can cause this diagnostic code are listed:
The energize circuit of the solenoid is shorted to a ground source.
The solenoid has failed.
The ECM has failed. This is unlikely. Before performing this procedure, inspect the harness connectors that are involved in the circuit. 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.Test Step 1. CHECK THE SOLENOID
Turn the disconnect switch and the key 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 FMI 06 diagnostic code changes to a FMI 05 diagnostic code when the solenoid is disconnected.Results:
YES - The active FMI 06 diagnostic code changes to a 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 - FMI 06 diagnostic code remains active. Disconnecting the solenoid did not affect the status of the diagnostic code. 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 switch and the disconnect switch to the OFF position.
Disconnect the machine harness connectors J1 and J2 from the Implement Control 2 ECM.
At the Implement Control 2 ECM machine harness connector J1, measure the resistance from the supply contact J1-51 (wire H759-OR) to frame ground. Measure the resistance from the supply contact J1-51 (wire H759-OR) to all of the other contacts that are used in the Implement Control 2 ECM connectors.Expected Result:Each resistance measurement is greater