Speed Sensor Diagnosis
- Turn ignition off. Apply parking brake. Using jumper wires, connect check connector terminals Tc, Ts and E1. See Figure. DO NOT depress brake pedal. Start engine. ANTI-LOCK light should blink once every .125 second. If ANTI-LOCK light does not blink, check ANTI-LOCK light circuit. See ANTI-LOCK LIGHT CIRCUIT charts under DIAGNOSTIC CHARTS.
- ANTI-LOCK light should change from blinking every .125 second to illuminating for one second. When brake pedal is depressed or when parking brake is released and then applied, ANTI-LOCK light should change back to blinking every .125 second.
- Release parking brake. Drive vehicle at indicated speeds, and ensure ANTI-LOCK light illuminates as described. See ANTI-LOCK LIGHT SPEED SENSOR DIAGNOSIS table.
- Stop vehicle. Observe ANTI-LOCK light. If system is normal, ANTI-LOCK light will blink every .125 second. If system is malfunctioning, ANTI-LOCK light will flash codes. Turn ignition off. Remove jumper wires from check connector. Repair as necessary. See SPEED SENSOR DIAGNOSTIC CODES under DIAGNOSIS & TESTING for code diagnosis, or see appropriate chart under DIAGNOSTIC CHARTS.
ANTI-LOCK LIGHT SPEED SENSOR DIAGNOSIS
| Vehicle Speed | ANTI-LOCK Light |
|---|---|
| 0-2 MPH | Blinks (Normal); Illuminates (Abnormal) |
| 2.5-3.7 MPH | Illuminates Every Second |
| 4-27 MPH | Blinks (Normal); Illuminates (Abnormal) |
| 28-34 MPH | Illuminates Every Second |
| 35-67 MPH | Blinks (Normal); Illuminates (Abnormal) |
| 68-81 MPH | Illuminates Every Second |
| 82 Or More | Blinks (Normal); Illuminates (Abnormal) |