ECD SYSTEM 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 symptom by checking the suspected areas in the order they are listed. Replace parts as necessary.

ECD SYSTEM
Symptom	Suspected Area	See page
Engine does not crank (does not start)	1. Starter(2.0 kw)	Click here
	Starter(2.7 kw)	Click here
	2. ST relay	Click here
	3. ECT sensor	Click here
Difficult to start with cold engine	1. Engine difficult to start or stalling	Click here
	2. Starter signal circuit	Click here
	3. Pre-heating control circuit	Click here
	4. Injector	Click here
	5. Fuel filter	Click here
	6. Compression	Click here
	7. ECM	-
	8. Suction control valve	Click here
	9. Fuel pressure sensor	Click here
	10. Diesel throttle body assembly	Click here
	11. EDU (relay)	-
	12. Battery deteriorated	Click here
	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	Click here
	2. Starter signal circuit	Click here
	3. Injector	Click here
	4. Fuel filter	Click here
	5. Compression	Click here
	6. ECM	-
	7. Suction control valve	Click here
	8. Fuel pressure sensor	Click here
	9. Diesel throttle body assembly	Click here
	10. EDU (relay)	-
	11. Air mixed into fuel pipe	-
	12. Battery deteriorated	Click here
Engine stalls soon after starting	1. Engine difficult to start or stalling	Click here
	2. Fuel filter	Click here
	3. Injector	Click here
	4. ECM power source circuit	Click here
	5. ECM	-
	6. Suction control valve	Click here
	7. Fuel pressure sensor	Click here
	8. Diesel throttle body assembly	Click here
	9. Air mixed into fuel pipe	-
Engine stalls (not including the condition listed above)	1. Engine difficult to start or stalling	Click here
Abnormal initial idling (poor idling)	1. Rough idling or excessive engine vibration	Click here
	2. Fuel filter	Click here
	3. Injector	Click here
	4. ECM	-
	5. Suction control valve	Click here
	6. Fuel pressure sensor	Click here
	7. Fuel with low cetane number used	-
	8. A/Cs signal circuit to ECM open and generators signal circuit to ECM open	-
High engine idling speed (poor idling)	1. Rough idling or excessive engine vibration	Click here
	2. A/C signal circuit	-
	3. Injector	Click here
	4. Starter signal circuit	Click here
	5. ECM	-
	6. Suction control valve	Click here
	7. Fuel pressure sensor	Click here
	8. Speed sensor circuit open	Click here
	9. Accelerator pedal	Click here
Low engine idling speed (poor idling)	1. Rough idling or excessive engine vibration	Click here
	2. A/C signal circuit	-
	3. Injector	Click here
	4. EGR system	Click here
	5. Compression	Click here
	6. Valve clearance	Click here
	7. Fuel line (air bleeding)	-
	8. ECM	-
	9. Suction control valve	Click here
	10. Fuel pressure sensor	Click here
	11. Diesel throttle body assembly	Click here
Rough idling (poor idling)	1. Rough idling or excessive engine vibration	Click here
Hunting with hot engine (poor idling)	1. Injector	Click here
	2. ECM power source circuit	Click here
	3. Compression	Click here
	4. Fuel line (air bleeding)	-
	5. Valve clearance	Click here
	6. ECM	-
	7. Suction control valve	Click here
	8. Fuel pressure sensor	Click here
	9. Diesel throttle body assembly	Click here
Hunting with cold engine (poor idling)	1. Injector	Click here
	2. ECM power source circuit	Click here
	3. Compression	Click here
	4. Fuel line (air bleeding)	-
	5. Valve clearance	Click here
	6. ECM	-
	7. Suction control valve	Click here
	8. Fuel pressure sensor	Click here
	9. Diesel throttle body assembly	Click here
Hesitation/Poor acceleration (poor driveability)	1. Lack of power or hesitation	Click here
	2. Injector	Click here
	3. Fuel filter	Click here
	4. EGR system	Click here
	5. Compression	Click here
	6. ECM	-
	7. Suction control valve	Click here
	8. Fuel pressure sensor	Click here
	9. Diesel throttle body assembly	Click here
	10. Accelerator pedal	Click here
	11. Turbocharger system	Click here
Knocking (poor driveability)	1. Engine knocking or rattling	Click here
Black smoke emitted (poor driveability)	1. Black smoke emitted	Click here
	2. EGR system	Click here
	3. Injector	Click here
	4. Accumulation in exhaust system	-
White smoke emitted (poor driveability)	1. EGR system	Click here
	2. Injector	Click here
	3. Fuel filter	Click here
	4. ECM	-
	5. Suction control valve	Click here
	6. Fuel pressure sensor	Click here
	7. Diesel throttle body assembly	Click here
	8. Pre-heating control circuit	Click here
	9. Low quality fuel	-
Surging/Hunting (poor driveability)	1. Injector	Click here
	2. ECM	-
	3. Suction control valve	Click here
	4. Fuel pressure sensor	Click here
	5. Turbocharger system	Click here