Symptom Tests: Notes
CAUTION:
Before proceeding, see ANTI-LOCK BRAKE SAFETY PROCEDURES
article in GENERAL INFORMATION.
CAUTION:
When battery or ECM is disconnected, vehicle computer and memory systems may lose memory data. Driveability problems may exist until adaptation systems have completed a relearn cycle. See COMPUTER RELEARN PROCEDURES - IMPORT article in GENERAL INFORMATION before disconnecting battery.
NOTE:
To properly diagnose vehicle, it is recommended to use HI-SCAN (PRO) scan tool. Before replacing any component that scan tool suggests is faulty, ensure that all wiring connections and harness connectors are okay. Ensure that power and ground circuits are functioning properly. For circuit identification, see WIRING DIAGRAMS
.
SYMPTOM TEST INDEX
| Symptom | Perform Test No. | |||
|---|---|---|---|---|
| No Communication With Scan Tool | ||||
| No Communication With Entire System | 1 | |||
| No Communication With ABS Only | 2 | |||
| ABS Warning Light Does Not Illuminate | 3 | |||
| ABS Light Remains Illuminated | 4 | |||
| Faulty ABS Operation | ||||
| Unequal Braking On Both Sides | 5 | |||
| Insufficient Braking Power | 5 | |||
| ABS Operates Under Normal Operating Conditions | 5 | |||
| ABS Operates Before Vehicle Stops In Normal Conditions | 5 | |||
| Wheel Speed Sensor Output Voltage Check | 6 | |||
| Large Brake Pedal Vibration | (1) | |||
|
||||