C1090-4: Check Brake Anti-Lock 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 PIDS LF_WSPD, RF_WSPD, LR_WSPD, RR_WSPD, push trigger.

- Rotate each wheel and observe NGS display.

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

YES -- Go to C1090-5. C1090-5: Check Anti-Lock Brake Warning Indicator

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