Inspection Procedure A-3: The electric tailgate automatic operation does not work normally (.both the open operation and close operation do not work).


caution Before replacing the ECU, ensure that the input and output signal circuits are normal.

COMMENTS ON TROUBLE SYMPTOM


Component other than Mitsubishi genuine parts or accessories is fitted on the tailgate. The quarter trim interferes with the electric tailgate motor arm. There may also be a malfunction in one of the followings; the tailgate gas spring, the door-ajar switch system, the electric tailgate main switch system, the tailgate sensor system, the wiring harness or its connector(s) between the battery and the electric tailgate control unit, the wiring harness or its connector(s) between the electric tailgate control unit and body earth, the electric tailgate motor itself or the electric tailgate control unit itself.

PROBABLE CAUSES



DIAGNOSIS PROCEDURE


STEP 1. Parts installation check of tailgate


Check whether a component other than Mitsubishi genuine parts or accessories is fitted on the tailgate.

Q. Is the check result normal?

Go to Step 2.

Remove the components other than Mitsubishi genuine parts or accessories.

STEP 2. Tailgate gas spring check


Visually check the tailgate gas spring for damage. Also, check the manual operation for any problems such as the operation is too light or too heavy.

Q. Is the check result normal?

Go to Step 3.

Replace the tailgate gas spring.

STEP 3. Interference inspection: quarter trim and electric tailgate motor arm


Check whether the quarter trim interferes with the electric tailgate motor arm.

Q. Is the check result normal?

Go to Step 4.

Install the electric tailgate control unit or the quarter trim securely.

STEP 4. M.U.T.-III data list


Check the signals related to the electric tailgate operation.

Item No.
 Item name
 Normal conditions
Item 1
 Main switch
 OFF → ON
Item 7
 Half door switch
 OFF → ON
Item 9
 Touch sensor (left)
 OFF → ON
Item 10
 Touch sensor (right)
 OFF → ON
Item 12
 ECU power supply voltage
 System voltage
OK: Normal conditions are displayed for all the items.

Q. Is the check result normal?

All are normal. : Go to Step 5.

Normal condition is not displayed for item No. 1. : Refer to Inspection Procedure B-1 "Electric tailgate main switch signal is not received" .

Normal condition is not displayed for item No. 7. : Refer to Inspection Procedure B-4 "Door-ajar switch signal is not received" .

Normal condition is not displayed for item 9 and 10. : Refer to Inspection Procedure B-7 "Tailgate sensor signal is not received" .

Normal condition is not displayed for item No. 12. : Refer to Inspection Procedure A-1 "Power supply voltage abnormality of electric tailgate control unit" .

STEP 5. System retest


Check whether the electric tailgate works normally.

Q. Is the check result normal?

Intermittent malfunction (Refer to GROUP 00 - How to Cope with Intermittent Malfunction .)

Replace the electric tailgate control unit.