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 symptoms by checking the suspected areas in the order they are listed. Replace parts as necessary.
| Symptom | Suspected area |
| Engine does not crank (does not start) | 1. Starter |
| 2. ST relay | |
| 3. ECT sensor | |
| Difficult to start with cold engine | 1. Engine difficult to start or stalling |
| 2. Starter signal circuit | |
| 3. Pre-heating control circuit | |
| 4. Injector | |
| 5. Fuel filter | |
| 6. Compression | |
| 7. ECM | |
| 8. Supply pump | |
| 9. Fuel pressure sensor | |
| 10. Diesel throttle body assembly | |
| 11. EDU (relay) | |
| 12. Battery deteriorated | |
| 13. Fuel with low cetane number used | |
| 14. Fuel frozen | |
| 15. Air mixed into fuel pipe | |
| Difficult to start with warm engine | 1. Engine difficult to start or stalling |
| 2. Starter signal circuit | |
| 3. Injector | |
| 4. Fuel filter | |
| 5. Compression | |
| 6. ECM | |
| 7. Supply pump | |
| 8. Fuel pressure sensor | |
| 9. Diesel throttle body assembly | |
| 10. EDU (relay) | |
| 11. Air mixed into fuel pipe | |
| 12. Battery deteriorated | |
| Engine stalls soon after starting | 1. Engine difficult to start or stalling |
| 2. Fuel filter | |
| 3. Injector | |
| 4. ECM power source circuit | |
| 5. ECM | |
| 6. Supply pump | |
| 7. Fuel pressure sensor | |
| 8. Diesel throttle body assembly | |
| 9. Air mixed into fuel pipe | |
| Engine stalls (not including the condition listed above) | 1. Engine difficult to start or stalling |
| Abnormal initial idling (poor idling) | 1. Rough idling or excessive engine vibration |
| 2. Fuel filter | |
| 3. Injector | |
| 4. ECM | |
| 5. Supply pump | |
| 6. Fuel pressure sensor | |
| 7. Fuel with low cetane number used | |
| 8. A/C signal circuit to ECM open and generator signal circuit to ECM open | |
| High engine idling speed (poor idling) | 1. Rough idling or excessive engine vibration |
| 2. A/C signal circuit | |
| 3. Injector | |
| 4. Starter signal circuit | |
| 5. ECM | |
| 6. Supply pump | |
| 7. Fuel pressure sensor | |
| 8. Speed sensor circuit open | |
| 9. Accelerator pedal | |
| Low engine idling speed (poor idling) | 1. Rough idling or excessive engine vibration |
| 2. A/C signal circuit | |
| 3. Injector | |
| 4. EGR system | |
| 5. Compression | |
| 6. Fuel line (air bleeding) | |
| 7. ECM | |
| 8. Supply pump | |
| 9. Fuel pressure sensor | |
| 10. Diesel throttle body assembly | |
| Rough idling (poor idling) | 1. Rough idling or excessive engine vibration |
| Hunting with hot engine (poor idling) | 1. Injector |
| 2. ECM power source circuit | |
| 3. Compression | |
| 4. Fuel line (air bleeding) | |
| 5. ECM | |
| 6. Supply pump | |
| 7. Fuel pressure sensor | |
| 8. Diesel throttle body assembly | |
| Hunting with cold engine (poor idling) | 1. Injector |
| 2. ECM power source circuit | |
| 3. Compression | |
| 4. Fuel line (air bleeding) | |
| 5. ECM | |
| 6. Supply pump | |
| 7. Fuel pressure sensor | |
| 8. Diesel throttle body assembly | |
| Hesitation/Poor acceleration (poor driveability) | 1. Lack of power or hesitation |
| 2. Injector | |
| 3. Fuel filter | |
| 4. EGR system | |
| 5. Compression | |
| 6. ECM | |
| 7. Supply pump | |
| 8. Fuel pressure sensor | |
| 9. Diesel throttle body assembly | |
| 10. Accelerator pedal | |
| 11. Turbocharger system | |
| Knocking (poor driveability) | 1. Engine knocking or rattling |
| Black smoke emitted (poor driveability) | 1. Black smoke emitted |
| 2. EGR system | |
| 3. Injector | |
| 4. Accumulation in exhaust system | |
| White smoke emitted (poor driveability) | 1. EGR system |
| 2. Injector | |
| 3. Fuel filter | |
| 4. ECM | |
| 5. Supply pump | |
| 6. Fuel pressure sensor | |
| 7. Diesel throttle body assembly | |
| 8. Pre-heating control circuit | |
| 9. Low quality fuel | |
| Surging/Hunting (poor driveability) | 1. Injector |
| 2. ECM | |
| 3. Supply pump | |
| 4. Fuel pressure sensor | |
| 5. Turbocharger system (VN turbo system) |
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