Tech Tips
When a malfunction is not confirmed by a DTC (Diagnostic Trouble Code) check and the cause of problem cannot be identified through a basic inspection, troubleshoot according to the priority order indicated in the table below.
Symptom | Suspected area | See page |
---|---|---|
Engine does not crank (Does not start) | 1. Starter | |
2. STARTER relay | ||
No initial combustion (Does not start) | 1. ECM power source circuit | |
2. Fuel pump control circuit | ||
3. ECM | ||
Engine cranks normally but difficult to start | 1. Fuel pump control circuit | |
2. Compression | ||
Difficult to start with cold engine | 1. Starter signal circuit | |
2. Fuel pump control circuit | ||
3. Spark plug | ||
4. Ignition system | ||
5. Injector | ||
Difficult to start with warm engine | 1. Starter signal circuit | |
2. Fuel pump control circuit | ||
3. Spark plug | ||
4. Ignition system | ||
5. Injector | ||
High engine idling speed (Poor idling) | 1. A/C signal circuit (compressor circuit) | - |
2. ECM power source circuit | ||
3. Electronic throttle control system | ||
4. Air induction system | ||
5. PCV hose | - | |
Low engine idling speed (Poor idling) | 1. A/C signal circuit (compressor circuit) | - |
2. Fuel pump control circuit | ||
3. Electronic throttle control system | ||
4. Air induction system | ||
5. PCV hose | - | |
Rough idling (Poor idling) | 1. Compression | |
2. Fuel pump control circuit | ||
3. Electronic throttle control system | ||
4. Air induction system | ||
5. PCV hose | - | |
Hunting (Poor idling) | 1. ECM power source circuit | |
2. Fuel pump control circuit | ||
3. Spark plug | ||
4. Ignition system | ||
5. Injector | ||
6. Electronic throttle control system | ||
7. Air induction system | ||
8. PCV hose | - | |
Hesitation/Poor acceleration (Poor driveability) | 1. Fuel pump control circuit | |
2. A/T faulty* | ||
3. Spark plug | ||
4. Ignition system | ||
5. Injector | ||
Surging (Poor driveability) | 1. Fuel pump control circuit | |
2. Spark plug | ||
3. Ignition system | ||
4. Injector | ||
Engine stalls soon after starting | 1. Fuel pump control circuit | |
2. Spark plug | ||
3. Ignition system | ||
4. Injector | ||
Engine stalls during A/C operation | 1. A/C signal circuit (Compressor circuit) | - |
2. ECM |