D9T Track-Type Tractor Hydraulic System – MID 113 – CID 0727 – FMI 06

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 valve. The FMI 06 diagnostic code means that the Power Train ECM has determined that there is a short to ground in the solenoid circuit.

The possible causes of this diagnostic code are listed below:

  • The energize circuit of the solenoid is shorted to ground.

  • 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 06 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 ON position. Do not start the engine.
  1. Observe the status of the diagnostic code.
  1. Disconnect the solenoid with the active diagnostic code from the machine harness.

Expected Result:

The CID 0727 FMI 06 diagnostic code changes to a CID 0727 FMI 05 diagnostic code when the solenoid is disconnected.

Results:

  • YES – The CID 0727 FMI 06 diagnostic code changes to a CID 0727 FMI 05 diagnostic code when the solenoid is disconnected. The circuit is correct. The solenoid has failed.

    Repair: Repeat this test “CHECK THE SOLENOID” to verify the solenoid failure. Replace the solenoid.

    STOP

  • NO – The CID 0727 FMI 06 diagnostic code remains active. Proceed to Test Step 2.

Test Step 2. CHECK THE ENERGIZE CIRCUIT OF THE SOLENOID FOR A SHORT TO GROUND

  1. Turn the key start switch and the disconnect switch to the OFF position.
  1. The solenoid remains disconnected from the machine harness.
  1. Disconnect the machine harness connector from the Power Train ECM.
  1. At the machine harness connector, measure the resistance from the signal contact J1-67 (wire F788-PU) to all contacts that are used in the machine harness connectors for the Power Train ECM.

Expected Result:

Each resistance measurement is greater than 5000 ohms.

Results:

  • OK – Each resistance measurement is greater than 5000 ohms. The machine harness is correct. Proceed to Test Step 3.

  • NOT OK – Each resistance measurement is not greater than 5000 ohms. There is a short in the machine harness. The short is between J1-67 (wire F788-PU) and the circuit with the low resistance measurement.

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

    STOP

Test Step 3. CHECK THE STATUS OF THE DIAGNOSTIC CODE

  1. Inspect the harness connectors and clean the contacts of 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 06 diagnostic code.

Expected Result:

The CID 0727 FMI 06 diagnostic code is not active.

Results:

  • YES – The CID 0727 FMI 06 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 06 diagnostic code is not 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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