OIL 1846022 - Caterpillar

Illustration 1 g00562617
Hoist Control Valve
(1) Proportional Solenoid (Control to Tank for Hoist Head End)
The location for the Proportional Solenoid (Control to Tank for Hoist Head End) is under the chassis between the transmission and the torque converter.
Illustration 2 g00562624
Schematic of the Proportional Solenoid (Control to Tank for Hoist Head End)
Note: The approximate coil resistance of the solenoid is 5 ohms at 25 °C (77 °F).This diagnostic code is associated with the Proportional Solenoid (Control to Tank for Hoist Head End). The FMI 05 means that the ECM has determined that the current of the solenoid is below normal. The possible causes of this diagnostic code are listed below:
The energize circuit of the solenoid is open.
The return circuit of the solenoid is open.
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 1239 FMI 05 is active before performing this procedure.Note: Use the 146-4080 Digital Multimeter for the measurements in this procedure.System Response:If the ECM receives a command of LOWER or FLOAT to the hoist system, the ECM will command the hoist pump control head solenoid, hoist pump control rod solenoid, and the hoist control rod solenoid to drain the hydraulic oil away from the head end of the cylinder. This will allow the hoist system to be commanded to the FLOAT mode.The hoist system will have normal operation in the RAISE mode and the HOLD mode.After the diagnostic goes away, the ECM will continue to command this output off until the hoist system goes into the HOLD or RAISE mode.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 J824-AW26-GY(Grey)) to contact 2 (wire H865-AW27-BR(Brown)).
Observe the status of the CID 1239 FMI 05. Expected Result:The CID 1239 FMI 05 remains active. The FMI has not changed and the "05" is still 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NO - The diagnostic is no longer active.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" in order 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 connector(s) from the ECM.
The jumper wire that was installed in the previous Test Step remains in place.
At the machine harness connector, measure the resistance from signal contact J2-3 (wire J824-J348-GY(Grey)) to contact J2-12 (wire H865-J448-BR(Brown)). Expected Result:The resistance is less than 5.0 ohms.Results:
OK - The resistance is less than 5.0