J3 Check Vehicle Speed Output

NOTE: Running the drive wheel off the ground may generate ABS wheel speed sensor DTCs and light the yellow ABS warning indicator. Cycling the ignition will cause the indicator to go out, but the DTCs will need to be cleared using the New Generation Star Tester 007-00500 or equivalent.

- Disconnect anti-lock brake control module 28-pin connector.

- Reinstall circuit 679 (GY/BK) to pin 12 of harness connector.

- Connect Rotunda 60-pin Breakout Box 014-00322 with Anti-Lock Brake Adapter 007-00116 or equivalents to the 28-pin harness connector.

- Place vehicle on hoist with wheels off the ground.

- Turn the ignition switch to the RUN position.

- Using a voltmeter such as Rotunda 73 Digital Multimeter or equivalent, while spinning the front wheels, measure the AC voltage between breakout box pin 12 and pin 1.

- Is AC voltage greater than 0.6 volt?

YES -- Go to J4. J4 Check Instrument Cluster For Speed Signal

NO -- Replace anti-lock brake control module. Restore vehicle. Retest system.