Rough Road Signal

Rough Road Signal Description

The SLABS/ABS control module transmits a PWM signal indicating rough road for misfire detection disablement.
The ECM has input diagnostics for this signal.

There are three plausibility checks of the PWM signal during which a fault is detected if:
1. The PWM signal is greater than a threshold indicating an electrical short to battery positive.
2. The PWM signal is less than a threshold indicating an electrical short to ground.
3. The PWM signal is greater than 44.92 % but less than 55.08 % indicating an error with the SLABS/ABS control module.