Description of OBD System

Diagnosis of the air suspension should begin with a visual check of the system's components for damage or leaks. Particular attention should be directed at the components mounted under the body (i.e. height sensors. air valve block, air lines, and air springs). After the visual inspection, the Air Suspension ECU (Z165) memory should be checked for stored fault information or codes using the Lucas RTC 6834 handheld tester (a required special tool) and air suspension smart card. The RTC 6834 handheld tester interfaces with the system when it is connected at the Air Suspension Diagnostic Connector (Z167) located under the left front seat. If an air suspension fault is found recorded in ECU memory. proceed to the "Stored Fault Diagnosis" and follow the diagnostic procedure directed for the stored fault. If no faults are recorded in the ECU memory or the air suspension ECU cannot communicate with the handheld tester, follow the directed procedure for the symptom that most closely resembles the symptom encountered.