525B Wheel Skidder and 535B Wheel Skidder Power Train Caterpillar

Before the power train electronic control module (ECM) is replaced, ensure that replacement is absolutely necessary. The power train ECM is seldom the cause of a fault. Always check that power is available to the power train ECM. Battery voltage is required from contacts 1 and 6 to contacts 2 and 5 of the machine harness connector J1 for the power train ECM.

1. Turn the battery disconnect switch and the key start switch to the OFF position. Disconnect the machine harness connectors from the power train ECM.

   Note: Use the screws in the center of the harness connector in order to remove the machine harness connectors from the power train ECM.

2. Remove the power train ECM.

3. Make sure that the new power train ECM that is being installed has the correct part number.

4. Connect the machine harness to the power train ECM.

5. Install the new power train ECM.

6. Turn the battery disconnect switch and the key start switch to the ON position.

7. Use the Caterpillar Electronic Technician (ET) in order to program the new power train ECM, if necessary.

8. If the correct software is not installed in the new power train ECM, use the ET in order to flash the correct software.

9. Calibrate the modulating valve (torque converter lockup clutch).

Reference: For additional information about the power train electronic control module (ECM), refer to Systems Operation, "Transmission Electrical System" for the machine that is being serviced.

Reference: For additional information on calibrating the modulating valve (torque converter lockup clutch), refer to Testing and Adjusting, "Calibration" for the machine that is being serviced.