Test C: DTC C1726 - Air Suspension Rear Pneumatic Failure
Test C: DTC C1726 - Air Suspension Rear Pneumatic FailureNormal 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 suspension height sensor indicates that the rear of the vehicle is lower or higher than trim height under normal driving conditions, the air suspension module will command the air compressor and air solenoid valves to either fill or vent the air springs depending on the input from the 2 height sensors. The air compressor sends the air to the air springs first through the drier then along the air tubes, passing through a Y-fitting and connections, through the air solenoid valves and finally to the air springs.
Possible Causes
^ Air leak(s)
^ Air tube restricted or leak(s)
^ Air tube(s)
^ Mounting bracket(s)
^ Air compressor drier
^ Air spring solenoid valve(s)
^ Height sensor(s)
^ Air compressor
^ Air spring(s)
^ Air suspension module
C1-C5:
C6-C10:
C11:
