CAUTION: Diagnosis by substituting a component from another vehicle is NOT allowed. The substitution of control units does not guarantee confirmation of the fault and, moreover, may cause additional faults in the tested vehicle and/or in the vehicle from which the modules are removed.
1. Visually inspect for obvious signs of mechanical and electrical damage.
Mechanical elements
- Tire condition, tire pressure, etc.
- Transmission, engine, gearbox, suspension, components (correct installation, damage, etc.)
Electrical elements
- Fuses
- Wiring harnesses and electrical connectors
- Terrain Response System Unit
- The engine control unit (ECM)
- transmission control unit (TCM)
- Anti-lock brake system control unit
- Active control unit
- Dynamic Suspension Control Unit * CAN Network Circuits
2. ELIMINATE any obvious causes of problems found during the visual inspection before performing any further checks.
3. If the cause is not visually obvious, check for DTCs and refer to the Diagnostic Trouble Code Index (DTC).
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