Inspection and Verification
CAUTION:
Diagnosis by substitution from a donor vehicle is NOT
acceptable. Substitution of control modules does not guarantee confirmation of a fault and may also cause additional faults in the vehicle being checked and/or the donor vehicle.
NOTE:
Check and rectify basic faults before beginning diagnostic routines involving pinpoint tests.
- Verify the customer concern.
- Visually inspect for obvious signs of mechanical or electrical damage.
Visual Inspection
Mechanical Electrical - Air leakage
- Air springs
- Reservoir
- Compressor
- Compressor air filter
- Pipework and unions
- Sensor installation
- Valve block(s)
- Suspension components
- Battery
- Fuse(s)
- Wiring harness physical damage or water ingress
- Loose or corroded electrical connectors
- Air suspension control switch
- Controller Area Network (CAN) circuits
- Sensors
- Actuators
- Valve block(s)
- Air suspension control module
- If an obvious cause for an observed or reported condition is found, correct the cause (if possible) before proceeding to the symptom chart.
- If the cause is not visually evident, verify the symptom and refer to the Symptom Chart, alternatively check for Diagnostic Trouble Codes (DTCs) and refer to the DTC Index.