Test C: DTC C1726 - Air Suspension Rear Pneumatic Failure

Pinpoint Test C: DTC C1726 - Air Suspension Rear Pneumatic Failure

Normal Operation
The air suspension height sensor sends a voltage signal to the air suspension module. The output ranges from approximately 4.5 volts at minimum height (when the vehicle is low or in full jounce) to 0.5 volt at maximum height (when the vehicle is high or in full rebound).

When the air suspension height sensor indicates that the rear of the vehicle is lower than trim height under normal driving conditions, the air compressor will turn on and pump compressed air into the air springs. When the sensor indicates that the rear of the vehicle is raised above trim under normal driving conditions, this will cause the air to be vented from the air springs to lower the vehicle back to its trim height level.
^ DTC C1726 Air Suspension Rear Pneumatic Failure - With the ignition key in the RUN position, DTC C1726 will be set if the air suspension system attempts and fails to inflate (pump) or deflate (vent) a specified number of times.

This pinpoint test is intended to diagnose the following:
^ Height sensor brackets
^ Air tube
^ Air suspension height sensor
^ Air spring solenoid valve
^ Air suspension compressor drier
^ Air suspension compressor
^ Air suspension module

C1-C3:

C3 (Continued)-C6:

C7-C11: