Self-Diagnostic System: Description: Notes

Vehicle Control Module (VCM) is equipped with a self-diagnostic system which detects system failures or abnormalities. When a malfunction occurs, VCM will store a DTC and, in most cases, illuminate the Malfunction Indicator Light (MIL) located on instrument cluster. Malfunctions are recorded as hard failures or intermittent failures.

There are 4 types of DTC categories:

• Type "A"
  
  Emissions related. Illuminates MIL the first time DTC sets.
• Type "B"
  
  Emissions related. Illuminates MIL if fault is active for 2 consecutive driving cycles.
• Type "C"
  
  Non-emissions related. Does not illuminate MIL, but will illuminate SERVICE light.
• Type "D"
  
  Non-emissions related. Does not illuminate MIL or SERVICE light.