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 injection learning failure
Fuel filter clogged
Fuel line leaking or clogged
Failed fuel pressure limiter valve
Failed fuel pressure sensor
Failed supply pump (suction control valve)
Failed supply pump correction learning
Failed glow system
Failed exhaust gas recirculation system operation
Failed engine-ECU
Compression pressure low

DIAGNOSIS PROCEDURE

STEP 1. Check battery voltage.

Measure battery voltage during cranking.

OK: 8 V or more

Q. Is the check result normal?

	Go to Step 2.

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

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 (Refer to ).

Item 05: Barometric pressure sensor
Item 07: Engine coolant temperature sensor
Item 08: No. 2 intake air temperature sensor
Item 16: Exhaust gas recirculation valve position
Item 17: Exhaust gas recirculation valve target position
Item 21: Fuel temperature sensor
Item 43: No. 1 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 injector identification code.

Check injector identification code (Refer to GROUP 00 - Precautions Before Service - Injector Identification Code Registration Procedure ).

Q. Is the check result normal?

	Go to Step 5.

	Register the injector ID.

STEP 5. Supply pump correction learning.

Carry out the supply pump correction learning (Refer to GROUP 00 - Precautions Before Service - Supply Pump Correction Learning ).

Q. Does trouble symptom persist?

	Go to Step 6.

	The procedure is complete.

STEP 6. Small injection quantity learning.

Carry out the small injection quantity learning procedure (Refer to GROUP 00 - Precautions Before Service - Small Injection Quantity Learning Procedure ).

Q. Does trouble symptom persist?

	Go to Step 7.

	The procedure is complete.

STEP 7. Confirm the using fuel.

Q. Is the specified fuel being used?

	Go to Step 8.

	Replace fuel.

STEP 8. Check glow system.

Check glow system (Refer to Inspection Procedure 27 ).

Q. Is the check result normal?

	Go to Step 9.

	Repair or replace the failed item.

STEP 9. Check fuel supply line.

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

Q. Is the check result normal?

	Go to Step 10.

	Repair or replace the failed item.

STEP 10. Priming (air bleeding)

Bleed air.

Q. Does trouble symptom persist?

	Go to Step 11.

	The procedure is complete.

STEP 11. 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 12.

	Replace the supply pump. After replacing the supply pump, learn the supply pump (Refer to GROUP 00 - Precautions Before Service - What The Common Rail Engine Learns ).

STEP 12. Check suction control valve itself.

Check suction control valve itself (Refer to ).

Q. Is the check result normal?

	Go to Step 13.

	Replace the supply pump. After replacing the supply pump, learn the supply pump (Refer to GROUP 00 - Precautions Before Service - What The Common Rail Engine Learns ).

STEP 13. M.U.T.-III data list.

Refer to Data List Reference Table (Refer to ).

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

Q. Are the check results normal?

	Go to Step 15.

	Go to Step 14.

STEP 14. Replace the fuel pressure sensor.

Replace the common-rail assembly.

Q. Does trouble symptom persist?

	Go to Step 18.

	The procedure is complete.

STEP 15. Check the waveforms of crank angle sensor and camshaft position sensor.

Check the output waveforms on an oscilloscope (Refer to ).

Q. Is the check result normal?

	Go to Step 16.

	Proceed to the inspection procedure by diagnosis code for the abnormal waveform (Refer to Inspection Chart for Diagnosis Code ).

STEP 16. Check compression pressure.

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

Q. Is the check result normal?

	Go to Step 17.

	Check and repair the engine itself.

STEP 17. Check injector itself.

Check injector itself (Refer to ).

Q. Is the check result normal?

	Go to Step 18.

	Replace the injector at the failed cylinder. After replacing the Injector, register the injector identification code and learn fuel injection (Refer to GROUP 00 - Precautions Before Service - What The Common Rail Engine Learns ).

STEP 18. Check the trouble symptoms.

Q. Does trouble symptom persist?

	Replace the engine-ECU. When the engine-ECU is replaced, write the chassis number (Refer to GROUP 00 - Precautions Before Service - How to Perform Chassis Number Writing ). After replacing the engine-ECU, register the injector identification code and learn fuel injection (Refer to GROUP 00 - Precautions Before Service - What The Common Rail Engine Learns ).

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