924H, 924HZ, 928HZ and 930H Wheel Loaders MID 081 - CID 1960 - FMI 09 Caterpillar


MID 081 - CID 1960 - FMI 09
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Conditions Which Generate This Code:

This diagnostic code is recorded when the Transmission ECM does not receive expected information from the key reader over the data link.

Note: The Machine Security System (MSS) must be installed in order for this diagnostic code to be logged.

Test Step 1. CHECK THE ET SCREENS.

  1. Check the active diagnostic screen and the logged diagnostic screen for a communication error between the Transmission ECM and the key reader.

Expected Result:

The electronic technician reports code CID 1960 FMI 09 as being active, or the diagnostic code has been logged.

Results:

  • YES - The electronic technician reports code CID 1960 FMI 09 as being active, or the diagnostic code has been logged.

    Repair: Troubleshoot the connections on the CAN data link between the key reader and the transmission ECM.

    Proceed to Test Step 2.

  • NO - The diagnostic code has NOT been logged or the diagnostic is NOT active. Proceed to Test Step 3.

Test Step 2. CHECK THE TERMINATING RESISTORS

  1. Disconnect the J2 harness connector for the transmission from the Transmission ECM.

  1. Measure the resistance between J2-67 (CAN A +) and J2-68 (CAN A -) on the machine harness connector for the Transmission ECM.

Expected Result:

The resistance is approximately 60 ± 3 Ohms.

Results:

  • OK - The resistance is within the range. Proceed to Test Step 3.

  • Not OK - The resistance is approximately 120 ± 6 Ohms. A terminating resistor is missing or damaged.

    Repair: If a termination resistor is missing, install the missing resistor. If both resistors are present, measure the resistance between pin A and pin B of each termination resistor. The resistance should measure 120 ± 3 Ohms. Replace the termination resistor if the resistance is not 120 ± 3 Ohms.Refer to the schematic in order to determine the missing resistor.Verify that the repair eliminates the problem.

    STOP

Test Step 3. CHECK FOR POWER TO THE KEY READER.

  1. With the keyswitch in the ON position, check for system voltage between contact 3 and contact 4 of the key reader.

Expected Result:

The voltage that is measured is approximately system voltage.

Results:

  • YES - The voltage that is measured is approximately system voltage. The voltage is correct. Proceed to Test Step 5.

  • NO - System voltage is NOT present. The wiring harness has failed.

    Repair: Check the wiring harness for signs of damage. Repair the machine harness or replace the machine harness.

    STOP

Test Step 4. CHECK THE CAN DATA LINK WIRING OF THE MACHINE HARNESS FOR AN OPEN CIRCUIT.

  1. Disconnect the J2 harness connector from the Transmission ECM.

  1. On the end of the harness that is near the key reader, install a jumper wire between contact 3 and contact 4.

  1. At the J2 of the Transmission ECM, measure the resistance between contact 67 and contact 68 of the connector for the Transmission ECM.

Expected Result:

The resistance is greater than 5000 ohms.

Results:

  • YES - The resistance is greater than 5000 ohms between contact 3 and contact 4. The wiring for the CAN data link between the ECM and the key reader is not correct.

    Repair: Check the wiring harness for signs of damage. Repair the machine harness or replace the machine harness.

    STOP

  • NO - The resistance is less than 5 ohms between contact 3 and contact 4. The wiring is correct. Proceed to Test Step 5.

Test Step 5. CHECK THE CAN DATA LINK WIRING OF THE MACHINE HARNESS FOR A SHORT TO GROUND.

  1. The wiring harness connector for the key reader and the Transmission ECM remain disconnected.

  1. The jumper wire remains installed.

  1. Measure the resistance between contact 67 of connector J2 on the Transmission ECM and frame ground.

  1. Measure the resistance between contact 68 of connector J2 of the Transmission ECM and frame ground.

Expected Result:

The resistance is greater than 5000 ohms.

Results:

  • YES - The resistance is greater than 5000 ohms. The resistance is correct. Proceed to Test Step 6.

  • NO - The resistance is less than 5 ohms. The wiring harness is shorted to the ground.

    Repair: Check the wiring harness for signs of damage. Repair the transmission harness or replace the transmission harness.

    STOP

Test Step 6. CHECK THE CAN DATA LINK WIRING OF THE TRANSMISSION HARNESS FOR A SHORT TO + BATTERY.

  1. The wiring harness connector for the key reader and the Transmission ECM remain disconnected.

  1. The jumper wire remains installed.

  1. Measure the resistance between contact 67 of connector J2 of the Transmission ECM and + battery.

  1. Measure the resistance between contact 68 of connector J2 of the Transmission ECM and + battery.

Results:

  • YES - The resistance is greater than 5000 ohms. The resistance is correct.

    Repair: The key reader or the Transmission ECM has failed. It is unlikely that the key reader or the Transmission ECM has failed. Perform the previous Test Steps again. If the cause of the problem is not found, replace the key reader and test again. If the problem still exists, replace the Transmission ECM. See Troubleshooting, "Electronic Control Module (ECM) - Replace".

    STOP

  • NO - The resistance is less than 5 ohms. The wiring harness is shorted to the + battery circuit.

    Repair: Check the wiring harness for signs of damage. Repair the transmission harness or replace the transmission harness.

    STOP

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