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 | ||
| ST relay | ||
| No initial combustion (engine does not start) | ECM power source circuit | |
| Fuel pump control circuit | ||
| ECM | ||
| No complete combustion (engine does not start) | Fuel pump control circuit | |
| Engine cranks normally but difficult to start | Start signal circuit | |
| Fuel pump control circuit | ||
| Compression | ||
| Difficult to start with cold engine | Start signal circuit | |
| Fuel pump control circuit | ||
| Difficult to start with hot engine | Start signal circuit | |
| Fuel pump control circuit | ||
| High engine idling speed (poor idling) | A/C signal circuit (compressor circuit) | - |
| ECM power source circuit | ||
| Low engine idling speed (poor idling) | A/C signal circuit (compressor circuit) | - |
| 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 (for A750E) | ||
| A/T faulty (for A750F) | ||
| Brake override system | ||
| Surging (poor driveability) | Fuel pump control circuit | |
| Engine stalls soon after starting | Fuel pump control circuit | |
| Engine stalls soon A/C operation | A/C signal circuit (compressor circuit) | - |
| ECM | ||
| MIL is not illuminated | MIL circuit |