D9T Track-Type Tractor Hydraulic System – MID 113 – CID 0727 – FMI 05

Conditions Which Generate This Code:



Illustration 1 g01670533

Schematic of the left steering solenoid

The CID 0727 diagnostic code is associated with the left steering solenoid. The FMI 05 diagnostic code means that the Power Train ECM has determined that an open exists in the circuit for the solenoid.

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 condition 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 0727 FMI 05 is active before performing this procedure.

Note: Use the 146-4080 Digital Multimeter for the measurements in this procedure.

Test Step 1. CHECK THE SOLENOID

  1. Turn the disconnect switch and the key start switch to the OFF position.
  1. Disconnect the solenoid with the active diagnostic code from the machine harness.
  1. At the machine harness connector for the solenoid, place a jumper wire from contact 1 (wire F788-PU) to contact 2 (wire H804-GN).
  1. Turn the disconnect switch and the key start switch to the ON position. Do not start the engine.
  1. Observe the status of the CID 0727 FMI 05 diagnostic code.

Expected Result:

The FMI 05 diagnostic code is no longer active. An FMI 06 diagnostic code is active after the jumper wire is connected.

Results:

  • YES – The FMI 05 diagnostic code is no longer active. An FMI 06 diagnostic code is active after the jumper wire is connected. The solenoid has failed.

    Repair: Replace the solenoid. Verify that the new solenoid corrects the problem.

    STOP

  • NO – The FMI 05 diagnostic code remains active. The jumper wire does not affect the status of the diagnostic code. The solenoid is not causing the problem. Proceed to Test Step 2.

Test Step 2. CHECK THE HARNESS FOR AN OPEN

  1. Turn the key start switch and the disconnect switch to the OFF position.
  1. Disconnect the machine harness connector from the Power Train ECM.
  1. The jumper wire that was installed in the previous Test Step remains in place.
  1. At the machine harness connector, measure the resistance from signal contact J1-67 (wire F788-PU) to contact J1-54 (wire H804-YL).

Expected Result:

The resistance is less than 5 ohms.

Results:

  • OK – The resistance is less than 5 ohms. The machine harness is correct. Proceed to Test Step 4.

  • NOT OK – The resistance is greater than 5000 ohms. The resistance measurement is not correct. There is an open circuit in the machine harness. The open is in wire F788-PU or in wire H804-GN of the machine harness.

    Repair: Repair the machine harness or replace the machine harness.

    STOP

Test Step 3. CHECK THE OPERATION OF THE ECM

The disconnect switch and the key start switch remain in the OFF position. The machine harness connectors for the solenoid and the ECM remain disconnected.

  1. Remove the jumper wire that was installed in the previous test step.
  1. At the machine harness connector J1 for the ECM, use a 151-6320 Wire Removal Tool to remove the solenoid energize wire F787-PU and socket at contact J1-67 from the harness connector.
  1. Reconnect the machine harness J1 connector to the ECM.
  1. Turn the disconnect switch and the key start switch to the ON position. DO NOT START THE ENGINE.
  1. Use a 7X-1710 Multimeter Probe that is not connected to a multimeter or a similar device to make contact with the ECM pin at J1-67 through the vacant space in the J1 connector.
  1. While observing the status of the active CID 0727 FMI 05 diagnostic code, ground the other end of the 7X-1710 Multimeter Probe to frame ground.

Expected Result:

The CID 0727 FMI 05 diagnostic code is no longer active. An FMI 06 diagnostic code is now active.

Results:

  • YES – The CID 0727 FMI 05 diagnostic code is no longer active. A CID 0727 FMI 06 diagnostic code has been activated after the ECM pin is grounded. The ECM has responded correctly to the grounded circuit condition in the solenoid circuit. The ECM is most likely not causing the problem. Reinstall the disconnected solenoid energize wire back into the correct spot in the ECM connector before proceeding to the next test step. Proceed to Test Step 4.

  • NO – The CID 0727 FMI 05 diagnostic code remains active. The status of the active diagnostic code does not change when the ECM pin for the solenoid is grounded.

    Repair: The ECM has not responded correctly to the open circuit condition in the solenoid circuit. The operation of the ECM is not correct.Exit this procedure and perform this procedure again. If the cause of the diagnostic code is not found, the ECM may have failed. Prior to replacing an ECM, always contact the technical communicator at your dealership for a possible consultation with Caterpillar. This consultation may greatly reduce repair time. Refer to Troubleshooting, “Electronic Control Module (ECM) – Replace”

    STOP

Test Step 4. CHECK THE STATUS OF THE DIAGNOSTIC CODE

  1. Inspect the contacts of the harness connectors and clean the harness connectors.
  1. Reconnect all harness connectors.
  1. Turn the disconnect switch and the key start switch to the ON position.
  1. Operate the machine.
  1. Check the status of the CID 0727 FMI 05 diagnostic code.

Expected Result:

The CID 0727 FMI 05 diagnostic code is not active.

Results:

  • YES – The CID 0727 FMI 05 diagnostic code is not active. The diagnostic code does not exist at this time. The initial diagnostic code may have been caused by a poor electrical connection that was corrected when a harness connector was disconnected and reconnected.

    Repair: Resume normal operation.

    STOP

  • NO – The CID 0727 FMI 05 diagnostic code is active. The problem has not been corrected.

    Repair: With Caterpillar Electronic Technician (Cat ET), if available, perform a “Wiggle Test” on the left steering solenoid circuit in the machine wiring harness. The wiggle test may detect momentary or intermittent shorts or opens in the machine wiring harness.If all possible causes of the problem have been investigated and no problem can be found, you may need to replace the Power Train ECM.Prior to replacing an ECM, always contact the Technical Communicator at your dealership for possible consultation with Caterpillar. This consultation may greatly reduce repair time and expense. If the ECM must be replaced, refer to Testing and Adjusting, “Electronic Control Module (ECM) – Replace”.

    STOP

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