Anti-Lock Brake System With Traction Control System - Abs-VI: Operation

During normal driving and braking operations, ABS acts like a conventional braking system. Each wheel speed sensor constantly sends an AC voltage signal to EBCM or EBTCM. This information is translated to wheel rotation speed. When EBCM or EBTCM detects wheel lock-up is about to occur, it activates appropriate solenoid to pulse on and off rapidly, regulating hydraulic pressure to each wheel. A slight pulsation should be felt through brake pedal, indicating ABS is working.

The BRAKE warning indicator (Red), ABS (amber), LOW TRACTION (amber)and TCS (amber) lights will illuminate when ignition switch is turned to RUN position. The lamps will turn on for approximately 3 seconds. If any indicator remains illuminated more than 30 seconds after vehicle is started, a system malfunction is indicated. See DIAGNOSIS & TESTING.

The red BRAKE warning indicator will activate if parking brake is applied or brake fluid is low. Amber ABS warning indicator is controlled by EBCM or EBTCM and comes on if problem is detected with ABS. When indicator is illuminated, ABS is disabled and braking is accomplished by conventional brake system. If both warning indicators are illuminated, check conventional brake system for hydraulic system failure. Amber TCS warning indicator is controlled by EBTCM and comes on if problem is detected with TCS. When indicator is illuminated, TCS is disabled and braking (conventional and ABS) is unaffected.

The LOW TRACTION light will illuminate and remain on for 3-4 seconds during and after the ABS or TCS have been activated. The ABS system is available at speeds greater than 3 MPH.