Troubleshooting Notes

TROUBLESHOOTING NOTES
The ABS is composed of electrical components, mechanical components (ABS hydraulic unit), and the components of the standard system.

Fundamentally, malfunction of the ABS electrical or mechanical components is judged by the on- board diagnostic function within the ABS control module. Malfunctions are indicated by the warning light in the instrument panel. The technicians can locate a malfunction by switching the system to the diagnostic test mode.

The on-board diagnostic system must be used when diagnosis of the ABS.

PRECAUTION
Conditions that are not malfunctions
1. Vibrations can sometimes be felt in the steering wheel, body, and/or brake panel when the ABS is functioning; such vibrations are simply an indication that the ABS is functioning.

2. When (while the vehicle is jacked up, stuck or on a chassis roller) the rear wheels only are spun for 20 seconds or more, the ABS warning light may illuminate. In this condition, the warning light will not illuminate a second time when ignition switch is turned OFF then back ON. However, diagnostic trouble code 12 (front left wheel-speed sensor) may be memorized as a past failure. If this occurs, do the following procedures.
(1) Activate the on-board diagnostic system and check for diagnostic trouble codes.
(2) If code 12 only is memorized, erase it.

If code 12 and other codes are memorized, check for the causes by referring to the applicable diagnostic chant for the other codes.

3. When battery voltage is insufficient, the warning light will illuminate and the ABS will not work. In this condition, at the moment battery voltage increases to the specified level, the warning light will go off and the system will return to normal control. There will also be no diagnostic trouble code entries made to the control module memory.