966G Wheel Loader and 972G Wheel Loader Electro-Hydraulic System Caterpillar

Illustration 1	g00279578
Implement ECM (1) Connector J1. (2) Connector J2.

Illustration 2	g00279579
Connector for Implement ECM (3) Screw.

Illustration 3	g00288881
Component Location (Right Rear of Cab) (4) Implement ECM. (5) Fuse panel. (6) Power train ECM.

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

Procedure

1. Turn the disconnect switch and the key start switch to the OFF. Disconnect the machine harness from the ECM by removing screw (3) .

2. Remove the bolts that secure the ECM to the machine.

3. Remove the ECM.

4. Install the replacement ECM.

5. Connect the machine harness to the replacement ECM and tighten screw (3) .

6. If the ECM is not programmed, flash new software to the ECM. For more information on flashing new software, refer to Testing and Adjusting, "Electronic Control Module (ECM) - Flash Program" for the machine that is being serviced.

7. Perform the necessary calibrations. For information on performing calibrations, refer to Testing and Adjusting, "Calibration".

8. Check for any active diagnostic codes after you replace the implement ECM.

   Reference: For more information about clearing fault codes, refer to Troubleshooting, "Using the Caterpillar Electronic Technician to Determine Diagnostic Codes" or Troubleshooting, "Using Caterpillar Monitoring System to Determine Diagnostic Codes".