SCREEN A. 8F5842 - Caterpillar

Illustration 1 g02472817
Medium Pressure Port A Solenoid connections for machines equipped with Medium Pressure Hydraulics.This diagnostic code is associated with the Medium Pressure Port A Solenoid (attachment). The FMI 06 diagnostic code means that the Machine ECM has determined that the circuit current for the solenoid is above normal.The Medium Pressure Port A Solenoid is a proportional solenoid that is controlled by a Machine ECM PWM driver output. To control the solenoid, the ECM will change the current of the PWM output signal for the solenoid.Conditions that can cause this diagnostic code are listed below:
The energize circuit of the solenoid is shorted to a ground source.
The solenoid has failed.
The ECM has failed. This situation 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. 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 FMI 06 diagnostic code changes to an FMI 05 diagnostic code when the solenoid is disconnected.Results:
YES - The FMI 06 diagnostic code changes to an FMI 05 diagnostic code when the solenoid is disconnected. The circuit is correct.Repair: The solenoid has failed. Repeat this test "CHECK THE SOLENOID" to verify the solenoid failure. Replace the solenoid.STOP
NO - The 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 Machine ECM and the Implement ECM 2.
At the machine harness connector J1 for the Machine ECM, measure the resistance from contact J1-61 (wire P942-YL) to frame ground. Measure the resistance to