Inspection Procedure 6: Improper Starting (Long Time to Start)

PROBABLE CAUSES

Failed battery
Improper fuel used
Fuel contaminated with foreign matter
Injector leaking or clogged
Failed injector
Fuel filter clogged
Fuel line leaking or clogged
Failed fuel pressure sensor
Failed supply pump (suction control valve)
Failed glow system
Failed EGR system operation
Failed engine-ECU
Compression pressure low

DIAGNOSIS PROCEDURE

STEP 1. Check battery.

Check battery (Refer to GROUP 54A - Battery - On-vehicle Service - Battery Test ).

Q. Is the check result normal?

	Go to Step 2.

	Replace the battery.

STEP 2. M.U.T.-III diagnosis code.

Q. Is the diagnosis code set?

	Inspection chart for diagnosis code (Refer to ).

	Go to Step 3.

STEP 3. M.U.T.-III data list.

Refer to Data List Reference Table .

Item 5: Barometric pressure sensor
Item 7: Engine coolant temperature sensor
Item 8: EGR gas temperature sensor
Item 16: EGR valve position sensor
Item 21: Fuel temperature sensor
Item 43: Intake air temperature sensor

Q. Are the check results normal?

	Go to Step 4.

	Perform the diagnosis code classified check procedure for the sensor that has shown an abnormal data value (Refer to Inspection Chart for Diagnosis Code ).

STEP 4. Check the using fuel.

Check for foreign matters (water, petrol fuel, etc.) in fuel.

Q. Is the specified fuel being used?

	Go to Step 5.

	Replace the fuel.

STEP 5. M.U.T.-III actuator test.

Refer to Actuator Test Reference Table .

Item 54: Glow (PWM) 0%
Item 55: Glow (PWM) 50%
Item 56: Glow (PWM) 100%

Q. Is the check result normal?

	Go to Step 6.

	Check the glow plug system (Refer to Code No. P0381 ).

STEP 6. Check fuel supply line.

Check for fuel leakage and clogging.
Check fuel filter for clogging.

Q. Is the check result normal?

	Go to Step 7.

	Repair.

STEP 7. Check the fuel pump driving.

Ignition switch: ON
Check for pump operating noise near fuel tank

OK: Operating sound of fuel pump can be heard

Q. Is the check result normal?

	Go to Step 8.

	Check fuel pump system (Refer to ).

STEP 8. M.U.T.-III actuator test.

Refer to Actuator Test Reference Table .

Item 19: Suction control valve

Q. Is the check result normal?

	Go to Step 9.

	Check suction control valve system (Refer to Code No. P0003 , Refer to Code No. P0004 ).

STEP 9. M.U.T.-III data list.

Refer to Data List Reference Table .

Item 63: Rail pressure sensor
Item 64: Rail pressure target

Q. Are the check results normal?

	Go to Step 12.

	Go to Step 10.

STEP 10. Replace the fuel pressure sensor.

After replacing the common-rail assembly, re-check the trouble symptoms.

Q. Does the trouble symptom persist?

	Go to Step 11.

	Check end.

STEP 11. Check the trouble symptoms.

Q. Does the trouble symptom persist?

	Replace the supply pump assembly.

	Intermittent malfunction (Refer to GROUP 00 - How to Use Troubleshooting/Inspection Service Points - How to Cope with Intermittent Malfunctions ).

STEP 12. Check compression pressure.

Check compression pressure (Refer to GROUP 11E - On-vehicle Service - Compression Pressure Check ).

Q. Is the check result normal?

	Go to Step 13.

	Repair.

STEP 13. Check injector itself.

Injector connector check.
Check injector itself (Refer to ).

Q. Is the check result normal?

	Go to Step 14.

	Repair or replace the connector, or replace the injector at the failed cylinder.

STEP 14. Check the trouble symptoms.

Q. Does the trouble symptom persist?

	Replace the engine-ECU.

	Intermittent malfunction (Refer to GROUP 00 - How to Use Troubleshooting/Inspection Service Points - How to Cope with Intermittent Malfunctions ).