NOTE: The following steps must be completed before using the symptom
tables.
1. Before using the symptom diagnostic table, perform the Diagnostic System
Check - Vehicle in
order to verify the following conditions:
There are no DTCs set.
The module can communicate via the serial data.
2. Review
Warning:
Engine exhaust contains carbon
monoxide (CO), which cannot be
seen or smelled. Exposure to CO
can cause unconsciousness and
even death.
Exhaust may enter the vehicle if:
The vehicle idles in areas
with poor ventilation
(parking garages, tunnels,
deep snow that may block
underbody air