Tech Tips
Use the table below to help determine the cause of the problem symptom. The potential causes of the symptoms are listed in order of probability in the "Suspected area" column of the table. Check each symptom by checking the suspected areas in the order they are listed. Replace parts as necessary.
| Symptom | Suspected Area | See page |
|---|---|---|
| Engine does not crank (engine does not start) | Start signal circuit | |
| Starter | ||
| Starter relay | ||
| No initial combustion (engine does not start) | ECM power source circuit | |
| Fuel pump control circuit | ||
| ECM | ||
| No complete combustion | Fuel pump control circuit | |
| Engine cranks normally but difficult to start | Starter signal circuit | |
| Fuel pump control circuit | ||
| Compression | ||
| Difficult to start with cold engine | Starter signal circuit | |
| Fuel pump control circuit | ||
| Difficult to start with hot engine | Starter signal circuit | |
| Fuel pump control circuit | ||
| High engine idling speed (poor idling) | A/C signal circuit (compressor unit) | - |
| ECM power source circuit | ||
| Low engine idling speed (poor idling) | A/C signal circuit (compressor unit) | - |
| Fuel pump control circuit | ||
| Rough idling (poor idling) | Compression | |
| Fuel pump control circuit | ||
| Hunting (poor idling) | ECM power source circuit | |
| Fuel pump control circuit | ||
| Hesitation / Poor acceleration (poor driveability) | Fuel pump control circuit | |
| A/T faulty | - | |
| Brake override system | ||
| Surging (poor driveability) | Fuel pump control circuit | |
| Engine stalls soon after starting | Fuel pump control circuit | |
| Engine stalls soon after A/C operation | A/C signal circuit (compressor unit) | - |
| ECM | ||
| MIL is not illuminated | MIL circuit |