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Problem Symptoms Table
PROBLEM SYMPTOMS TABLE - ENGINE CONTROL SYSTEM
| Symptom |
Suspected Area |
| Engine does not crank (does not start) |
- 44. Starter
- 45. STARTER relay
- 46. Ignition Switch
|
| No initial combustion (does not start) |
- ECM power source circuit
- Fuel pump control circuit
- ECM
|
| Engine cranks normally (difficult to start) |
- Fuel pump control circuit
- Compression
|
| Cold engine (difficult to start) |
- Starter signal circuit
- Fuel pump control circuit
- Spark plug
- Ignition system
- Injector
|
| Hot engine (difficult to start) |
- Starter signal circuit
- Fuel pump control circuit
- Spark plug
- Ignition system
- Injector
|
| High engine idle speed |
- A/C signal circuit (compressor circuit)
- ECM power source circuit
- Electronic throttle control system
- Air induction system
- PCV hose
|
| Low engine idle speed |
- A/C signal circuit (compressor circuit)
- Fuel pump control circuit
- Electronic throttle control system
- Air induction system
- PCV hose
|
| Rough idling |
- Compression
- Fuel pump control circuit
- Electronic throttle control system
- Air induction system
- PCV hose
|
| Hunting (when idling) |
- ECM power source circuit
- Fuel pump control circuit
- Spark plug
- Ignition system
- Injector
- Electronic throttle control system
- Air induction system
- PCV hose
|
| Hesitation/Poor acceleration (poor driveability) |
- Fuel pump control circuit
- A/T faulty
- Spark plug
- Ignition system
- Injector
|
| Surging (poor driveability) |
- Fuel pump control circuit
- Spark plug
- Ignition system
- Injector
|
| Engine stalls soon after starting |
- Fuel pump control circuit
- Spark plug
- Ignition system
- Injector
|
| Engine stalls during A/C operation |
- A/C signal circuit (Compressor circuit)
- ECM
|
| Unable/difficult to refuel |
Refueling valve (canister) |