Excess Decay

NAME OF CODE:
Excess Decay

WHEN MONITORED:
During Anti-lock Brake System (ABS) cycling, if any two decay valves are on for more than 4.5 seconds.

SET CONDITION:
If, during ABS cycling, any two decay valves are commanded to remain on for more than the set time and the trouble code is set. The ABS warning lamp is illuminated until the vehicle speed is less than 3 miles per hour. Only the rear ABS is allowed to ensure stability.

POSSIBLE CAUSES:
- Hydroplaning
- Excessively worn tires
- Very long stops on ice
- Wheel speed sensor trouble code
- Incorrect tone wheels
- Incorrect Controller, Anti-lock Brake (CAB)
- Modulator trouble code/solenoid valve problem
- Leaving the clutch engaged during braking on ice at low speeds
- Wheel speed sensor pick-up end contaminated or damaged
- Very cold weather causing slow decay rates