Flow of Diagnosis

BASIC TROUBLESHOOTING
When checking engine trouble, it is important to start with an inspection of the basic systems. If one of the following conditions exists, (A) engine start failure, (B) unstable idling or (C) poor acceleration, begin by checking the following basic systems.

1. Power supply
- Battery
- Fusible link
- Fuse

2. ECM ground

3. Fuel supply
- Fuel line
- Fuel filter
- Fuel pump

4. Ignition system
- Spark plug
- High-tension cable
- Ignition coil
- ECM

5. Emission control system
- PCV system
- Vacuum leak

6. Others
- Ignition timing
- Idle speed

NOTE Trouble with the multiport fuel injection (MFI) system is often caused by poor contact of the harness connectors. It is important to check all harness connectors and verify that they are securely connected.

TSB-TECHNICAL SERVICE BULLETINS
Check for TSBs that may be related to a vehicle symptom, component test or diagnostic trouble code (DTC). TSBs may contain additional information that can provide help with vehicle diagnosis.