Problem symptoms table

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.
 

ECD system 
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)