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
NOTE:
Do not use this troubleshooting procedure if the
radiator fan and/or A/C compressor is inoperative.
Refer to the symptom troubleshooting index.
Before doing symptom troubleshooting, check for
powertrain DTCs.
1. Check the No.6 (20 A) and No. 15 (7.5 A) fuses in
the under-hood fuse/rela
1. If the engine is already out of the vehicle, go to step
20.
2. Raise the vehicle on the lift to full height.
3. Drain the engine oil.
4. Remove the front wheels.
5. Remove the splash shield (see step 21).
6. Disconnect the air fuel ratio (A/F) sensor connector
and secondary heated oxygen sen