Symptom Diagnosis

SYMPTOM DIAGNOSIS

Symptom

Possible Cause

Diagnostic Test

Unable To Enter On-Demand Self-Test Or Pneumatic Test

Defective Wiring, Multiplex Communications Network Or Vehicle Dynamics Module

⁽¹⁾

One Or More Corners Low & CHECK RIDE CONTROL Message Displayed 1.5-2 Minutes After Engine Start-Up

Compressor Inoperative, Compressor Leak, Air Spring Leak Or Air Line Leak

⁽²⁾

CHECK RIDE CONTROL - Message Displayed Less Than 5 Seconds After Start-Up

Fault Is Detected

⁽³⁾

CHECK RIDE CONTROL - Message Displayed (Random)

Fault Is Detected

⁽³⁾

CHECK RIDE CONTROL - Message Not Displayed Ride Very Rough Or Floaty

Fault Is Detected

⁽³⁾⁽⁴⁾⁽⁵⁾

CHECK RIDE CONTROL - Message Not displayed One Or More Corners High Or Low

Fault Is Detected

⁽³⁾⁽⁴⁾

One Or More Corners Drop Over Night Achieves Trim When Ignition Turned On

Possible Air Leak ⁽⁶⁾

⁽³⁾

Steering and Ride Hard At All Times

Defective Wring, Multiplex Communications Network Or Vehicle Dynamics Module

⁽⁷⁾

CHECK RIDE CONTROL - Message Displayed 45-90 Seconds After Starting Vehicle

Height Sensor Off Ball Stud, Height Sensor Circuit Open

⁽³⁾⁽²⁾

⁽¹⁾	See Test Y.

⁽²⁾	Ceck for trouble codes. If any codes are present, perform appropriate diagnostic test. If no codes are present and compressor does not operate, go to TEST W under DIAGNOSTIC TEST. If no codes are present and compressor operates, go to TEST X under DIAGNOSTIC TEST.

⁽³⁾	Check for trouble codes and perform diagnostic test as necessary.

⁽⁴⁾	DO NOT attempt to recalibrate ride height until system passes ON-DEMAND SELF TEST.

⁽⁵⁾	If On-Demand self test and pneumatic test returns SYSTEM PASSED, recalibrate ride height. See RIDING HEIGHT under ADJUSTMENTS & INSPECTION. If no change is experienced, shock or strut may be damaged. Repair as necessary.

⁽⁶⁾	A large drop in temperature over night causes air in air spring to contract. This will cause ALL corners to drop same amount, this is normal.

⁽⁷⁾	See TEST Z.