How To Proceed With Troubleshooting

SUSPENSION CONTROL: AIR SUSPENSION SYSTEM: HOW TO PROCEED WITH TROUBLESHOOTING

HOW TO PROCEED WITH TROUBLESHOOTING
HINT: Use these procedures to troubleshoot the air suspension system.
*: Use the intelligent tester or Techstream.

1. VEHICLE BROUGHT TO WORKSHOP
NEXT -- Continue to next step.
2. PROBLEM SYMPTOM CONFIRMATION
NEXT -- Continue to next step.
3. INSPECT AUXILIARY BATTERY VOLTAGE
Standard voltage:
11 to 14 V
If the voltage is below 11 V, recharge or replace the auxiliary battery before proceeding.
NEXT -- Continue to next step.
4. CHECK ECUS CONNECTED TO CAN BUS*
(a) Check ECUs connected to CAN bus Diagnosis System.

Result





B -- Go to CAN COMMUNICATION SYSTEM (HOW TO PROCEED WITH TROUBLESHOOTING)
A -- Continue to next step.
5. CHECK DTC (CAN AND LIN COMMUNICATION SYSTEM)*
(a) Check for all DTCs.

Result





B -- Go to CAN COMMUNICATION SYSTEM (HOW TO PROCEED WITH TROUBLESHOOTING)
C -- Go to LIN COMMUNICATION SYSTEM (HOW TO PROCEED WITH TROUBLESHOOTING)
D -- Go to DIAGNOSTIC TROUBLE CODE CHART
A -- Continue to next step.
6. PROBLEM SYMPTOM TABLE

Result





B -- Go to step 8
A -- Continue to next step.
7. OVERALL ANALYSIS AND TROUBLESHOOTING*
(a) DATA LIST / ACTIVE TEST Air Suspension System

(b) Terminals of ECU Air Suspension System

NEXT -- Continue to next step.
8. REPAIR OR REPLACE
NEXT -- Continue to next step.
9. CONFIRMATION TEST
NEXT -- END