Intermittent Failures
The term "intermittent failure" means a system may
have had a failure, but it checks OK now. If the
malfunction indicator lamp (MIL) on the dash does not
come on, check for poor
Electronic Control System
The functions of the fuel and emission control systems are managed by the
powertrain control module (PCM).
Self-diagnosis
The PCM detects a failure of a signal from a sensor
Testing of Readiness Codes
If you take your vehicle for an
emissions test shortly after the
battery has been disconnected or
gone dead, it may not pass the test.
This is because of certain ‘‘readiness
codes’’ that must be set in the onboard
diagnostics for the emissions
systems
1. Open the tailgate.
Unlatch the top of the cover by
pulling back on it with your hands.
2. Place a cloth on the side edge of
the cover to prevent scratches.
Remove the cover by carefully
prying on the edge with a small
flat-tip screwdriver and pulling the
cover off.
3. Remove the