D9T Track-Type Tractor Hydraulic System – MID 113 – CID 2596 – FMI 05

Conditions Which Generate This Code:



Illustration 1 g02155456

Brake pressure modulation solenoid connections



Illustration 2 g02155579

Location of the brake valve solenoid

The CID 2596 diagnostic code is associated with the brake pressure modulation solenoid. The solenoid is connected to a PWM driver output of the Power Train ECM. The FMI 05 means that the Power Train ECM has detected that an open exists in the circuit for the solenoid.

Conditions that may this diagnostic code to be activated are:

  • 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: 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.

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.

Note: The resistance of a good Brake Pressure Modulation Solenoid coil is 8.7 ± 0.4 ohms at approximately 25 °C (77 °F). Resistance will increase as the temperatures increase.

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.

Test Step 1. CHECK THE SOLENOID

  1. Turn the key start switch and the disconnect switch to the OFF position.
  1. Disconnect the solenoid from the machine harness.
  1. At the machine harness connector for the solenoid, connect a jumper wire between contact 1 (wire F792-WH) to contact 2 (wire 952-BR).
  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 2176 FMI 05 diagnostic code.

Expected Result:

The CID 2176 FMI 05 diagnostic code is no longer active. A CID 2176 FMI 06 diagnostic code becomes active when the jumper wire is connected.

Results:

  • YES – The CID 2176 FMI 05 diagnostic code is no longer active. A CID 2176 FMI 06 diagnostic code becomes active when the jumper wire is connected. 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.

    STOP

  • NO – The CID 2176 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 CIRCUIT FOR AN OPEN

  1. Turn the key start switch and the disconnect switch to the OFF position.
  1. Disconnect the machine harness connector J1 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 J1 for the Power Train ECM, measure the resistance from the return contact J1-60 (wire 952-BR) to the energize contact J1-58 F792-WH).

Expected Result:

The resistance measurement is less than 5 ohms.

Results:

  • OK – The resistance measurement is less than 5 ohms. The circuit is not open in the machine harness. Proceed to Test Step 3.

  • NOT OK – The resistance measurement is greater than 5000 ohms. The resistance measurement is not correct. There is an open or possible poor connection in supply wire F792-WH or in return wire K952-BR of the machine harness.

    Repair: Check all of the connectors that are in the circuit. Ensure that all of the contacts for the circuit are in good condition, are clean, and are securely fastened in each of the harness connectors. 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 connector for the solenoid and the Power Train ECM J1 connector remain disconnected.

  1. Remove the jumper wire that was installed in the last test step.
  1. At the machine harness connector J1 for the Power Train ECM, use a 151-6320 Removal Tool to remove the solenoid energize wire F792-WH) and socket at contact J1-58 from the harness connector.
  1. Reconnect the machine harness J1 connector to the Power Train ECM.
  1. Turn the disconnect switch and the key start 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. Contact the ECM pin at J1-58 through the vacant space in the J1 connector.
  1. While observing the status of the active CID 2596 FMI 05 diagnostic code, ground the other end of the 7X-1710 Multimeter Probe to frame ground.

Expected Result:

The CID 2176 FMI 05 diagnostic code is no longer active. A CID 2176 FMI 06 diagnostic code becomes active when the ECM pin at J1-58 is grounded.

Results:

  • YES – The CID 2176 FMI 05 diagnostic code is no longer active. A CID 2176 FMI 06 diagnostic code has been activated after the Power Train ECM pin is grounded. The ECM has responded correctly to the grounded circuit condition in the solenoid circuit. The Power Train ECM may have failed.

    Reinstall the disconnected solenoid energize wire back into the correct spot in the Power Train ECM connector before proceeding to the next test step.

    Proceed to Test Step 4.

  • NO – The CID 2176 FMI 05 diagnostic code remains active. The status of the active diagnostic code does not change when the Power Train ECM pin for the solenoid is grounded. The ECM has not responded correctly to the grounded condition in the solenoid circuit. The operation of the ECM is not correct. You may need to replace the Power Train ECM

    Repair: Exit this procedure and perform this procedure again. If the cause of the diagnostic code is not found, replace the Power Train ECM. Prior to replacing an ECM, contact the Technical Communicator at your dealership for possible consultation with Caterpillar. This consultation may greatly reduce repair time. If the ECM requires replacement, refer to Troubleshooting, “Electronic Control Module (ECM) – Replace”.

    STOP

Test Step 4. CHECK THE STATUS OF THE DIAGNOSTIC CODE

  1. Inspect the harness connectors and clean the contacts of the harness connectors that are involved in the solenoid circuit. Check the wires for damage to the insulation that can be caused by excessive heat, corrosion, or chafing.
  1. Perform a 45 N (10 lb) pull test on each of the wires that are associated with the sensor circuit.
  1. Reconnect all harness connectors. Make sure that the connectors are fully seated and the clips for each connector are fastened.
  1. Turn the disconnect switch and the key start switch to the ON position. DO NOT START THE ENGINE.
  1. Check the status of the CID 2176 FMI 05 diagnostic code.

Expected Result:

The CID 2176 FMI 05 diagnostic code is not active.

Results:

  • OK – The CID 2176 FMI 05 diagnostic code is not active. The diagnostic code does not exist at this time. The initial diagnostic code was probably caused by a poor connection or a short at one of the connectors that was disconnected and reconnected. Resume normal operation.STOP

  • NOT OK – The CID 2176 FMI 05 diagnostic code is active. The problem has not been corrected.

    Repair: With Caterpillar Electronic Technician (Cat ET), if available, in order to perform a “Wiggle Test” on the sensor 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 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 Troubleshooting, “Electronic Control Module (ECM) – Replace”.

    STOP

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