Inspection Procedure 5: Engine does not start (cranking is not performed).



caution Before replacing the ECU, ensure that the power supply circuit, the earth circuit and the communication circuit are normal.


COMMENTS ON TROUBLE SYMPTOM




PROBABLE CAUSES



  • Malfunction of battery
  • Damaged wiring harness or connector (open circuit in STOE line)
  • Error in engine starting circuit system
  • Stop lamp switch malfunction <CVT vehicle>
  • Clutch switch malfunction <M/T vehicle>
  • Malfunction of the CAN bus line
  • Malfunction of OSS-ECU
  • Malfunction of AS&G-ECU
  • Engine-ECU malfunction
  • ETACS-ECU malfunction

PROBABLE CAUSES


STEP 1. Battery check



Q. Is the check result normal?





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



Q. Is the diagnosis code set?







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




  • Operate the brake pedal.
Operation state
Item No.
Check item
Display
Brake pedal is depressed
3
Stop lamp switch
ON
Brake pedal released
OFF
OK: Operation state and data list display agree with each other.

Q. Is the check result normal?







STEP 4. Stop Lamp Switch Check



Q. Is the check result normal?





STEP 5. M.U.T.-III data list




  • Operate the clutch pedal.
Operation state
Item No.
Check item
Display
Clutch pedal depressed
7
Clutch monitoring switch
ON
Clutch pedal released
OFF
OK: Operation state and data list display agree with each other.

Q. Is the check result normal?







STEP 6. Check of open circuit in CLMS line between OSS-ECU connector and clutch switch connector


Q. Is the check result normal?





STEP 7. Clutch switch check



Q. Is the check result normal?





STEP 8. Check of the troubles



Q. Does the starter rotate (cranking is performed)?





STEP 9. Voltage measurement at ETACS-ECU connector (STOE terminal)


(1)With the ETACS-ECU connector kept connected, measure by backprobing.
(2)Using the M.U.T.-III, set the forced power supply output to other than "IG-ST".(Refer to .)
(3)Measure the voltage between the ETACS-ECU connector (STOE terminal) and body earth.
OK: 1 V or less
(4)Using the M.U.T.-III, set the forced power supply output to "IG-ST".(Refer to .)
(5)Measure the voltage between the ETACS-ECU connector (STOE terminal) and body earth.
OK: System voltage

Q. Is the check result normal?







STEP 10. M.U.T.-III other system data list



(1)Using the M.U.T.-III, set the forced power supply output to "IG-ST".(Refer to .)
(2)Check the engine-ECU data list.

<PETROL VEHICLE>
Item No.
Check item
Display
79
Cranking signal
(Ignition switch-ST)
ON

<DIESEL VEHICLE>
Item No.
Check item
Display
40
Starter switch
ON
OK: Operation state and data list display agree with each other.
(3)Using the M.U.T.-III, set the forced power supply output to other than "IG-ST".(Refer to .)
(4)Check the engine-ECU data list.

<PETROL VEHICLE>
Item No.
Check item
Display
79
Cranking signal
(Ignition switch-ST)
OFF

<DIESEL VEHICLE>
Item No.
Check item
Display
40
Starter switch
OFF
OK: Operation state and data list display agree with each other.

Q. Is the check result normal?





STEP 11. Check of open circuit in STOE line between ETACS-ECU connector and engine-ECU connector


Q. Is the check result normal?





STEP 12. Check of the troubles



Q. Is the check result normal?





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



(1)Using the M.U.T.-III, set the forced power supply output to "IG-ST".(Refer to .)
(2)Check the AS&G-ECU data list.
Item No.
Check item
Display
1
Starter switch (Ignition switch-ST)
ON
OK: Operation state and data list display agree with each other.
(3)Using the M.U.T.-III, set the forced power supply output to other than "IG-ST".(Refer to .)
(4)Check the AS&G-ECU data list.
Item No.
Check item
Display
1
Starter switch (Ignition switch-ST)
OFF
OK: Operation state and data list display agree with each other.

Q. Is the check result normal?





STEP 14. Check of open circuit in STOE line between ETACS-ECU connector and AS&G-ECU connector


Q. Is the check result normal?





STEP 15. Check of the troubles



Q. Is the check result normal?