C1237-4: Check Wheel Speed Sensor Output

- Make sure all connections are clean and tight.

- Using Rotunda New Generation Star (NGS) Tester 007-00500 or equivalent, select PID/Data Monitor and Record.

- Select all four wheels, push trigger.

- Rotate each wheel and observe NGS display.

- Did display show wheel speed for each wheel as wheel is rotated?

YES -- Go to C1237-5 C1237-5: Check Anti-Lock Brake Warning Indicator

NO -- Go to Pinpoint Test D for proper diagnosis of front brake anti-lock sensors and rear brake anti-lock sensors and circuitry. D