HOUSING 4N1941 - Caterpillar

Illustration 1 g02027013
Schematic of the "Attachment Valve #1 Retract Pressure" Solenoid
This diagnostic code is associated with the "Attachment Valve #1 Retract Pressure" Solenoid. The FMI 05 diagnostic code means that the Machine ECM has determined that the current is below normal.For machines equipped with the E-Fence feature, reference Troubleshooting , " E-Ceiling and Cab Avoidance - Troubleshoot"The possible causes of this diagnostic code are listed below:
The solenoid energize circuit for the "Attachment Valve #1 Retract Pressure" solenoid is open.
The return circuit of the "Attachment Valve #1 Retract Pressure" solenoid is open.
The "Attachment Valve #1 Retract Pressure" solenoid has failed.
The Machine ECM may have failed (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 1596 FMI 05 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 is active, the Machine ECM will turn off the current to the failed solenoid.Test Step 1. CHECK THE SOLENOID
Turn the disconnect switch and the key start switch to the ON position. Do not start the engine.
Disconnect the solenoid with the active diagnostic code from the machine harness.
At the machine harness connector for the solenoid, place a jumper wire from contact 1 (wire K860-BU(Blue)) to contact 2 (wire K868-BR(Brown)).
Observe the status of the CID 1596 FMI 05 diagnostic code. Expected Result:The CID 1596 FMI 05 diagnostic code remains active. Results:
YES - The diagnostic code remains active. The jumper wire does not affect the diagnostic code. Proceed to Test Step 2.
NO - The diagnostic is no longer active. The solenoid has failed.Repair: The solenoid has failed. Repeat this Test Step "CHECK THE SOLENOID" to verify the solenoid failure. Replace the solenoid. Verify that the new solenoid corrects the problem.STOPTest Step 2. CHECK THE HARNESS FOR AN OPEN
Turn the key start switch and the disconnect switch to the OFF position.
Disconnect the machine harness connectors from the Machine ECM.
The jumper wire that was installed in the previous test remains in place.
At the machine harness connector, measure the resistance from signal contact J2-32 (wire K860-BU(Blue)) to contact J2-19 (wire K868-BR(Brown)). Expected Result:Both resistances are less than 5.0 ohms.Results:
OK - Both resistances are less than 5.0 ohms. The machine harness is correct. Proceed to Test Step 3.
NOT OK - Either resistance is greater than 5000 ohms. The resistance measurement is not correct. There is an open circuit in the machine harness.Repair: The open is in wire K860-BU(Blue) or in wire K868-BR(Brown) of the machine harness. Repair the machine harness or replace the machine harness.STOPTest Step 3. CHECK IF THE DIAGNOSTIC CODE REMAINS
Inspect the contacts of the harness connectors and clean 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 1596 FMI 05 diagnostic code. Expected Result:The CID 1596 FMI 05 diagnostic code is active.Results:
YES