The compress accumulator will detect conditions of excessive rear suspension leveling air compressor activity. This condition is generally due to the presence of pneumatic leaks or vehicle overload conditions. An accumulator timer will keep track of the accumulated run time of the compressor. The timer resets at each ignition cycle or if an exhaust sequence has occurred.

When the compressor is active for more than 3 minutes before the rear of the vehicle reaches a trim position.

Refer to Automatic Level Control System Operation Check for diagnosis.