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
If the indicator comes on
while driving, it means one
of the engine’s emissions control
systems may have a problem. Even
though you may feel no difference in
your vehicle’s performance, it can
reduce your fuel economy and cause
increased emissions. Continued
operation may cause
NOTE:
Make sure the HDS is loaded with the latest software
version.
If you are replacing the PCM after substituting a
known-good PCM, reinstall the original PCM, then do
this procedure.
During the procedure, is any READ DATA, WRITE
DATA, or other data checks fail, note the failure, then
con