143H and 163H Motor Graders All Wheel Drive Caterpillar

This is the procedure for testing the all wheel drive ECM. The all wheel drive ECM is located in front of the cab. The all wheel drive ECM controls the all wheel drive system. System Operation

Reference: Refer to Troubleshooting, "Electronic Control Module (ECM)".

Test Step 1.

1. Perform the all wheel drive ECM self-test.

Reference: Refer to Troubleshooting, "Self Test".Specifications

Reference: Refer to Troubleshooting, "Electronic Control Module (ECM)".

Expected Result:

The all wheel drive ECM is operating correctly.

Results:

• Yes - Stop.

• No - Proceed to test step 2.

Test Step 2.

1. Replace the all wheel drive ECM. Use new Caterpillar parts for replacement.

Reference: Refer to Troubleshooting, "All Wheel Drive Electronic Control Module".Parts

Reference: Refer to Troubleshooting, "8W-6335 CONTROL GP-AWD ELECTRONIC PIN 5AK74-UP. PART OF 8W-6310 DRIVE AR-ALL WHEEL".

Expected Result:

The all wheel drive ECM has been replaced.

Results:

• Repair Complete - Stop.