Inspection Procedure 11: Gear shift does not occur with 1st <=> 2nd


COMMENTS ON TROUBLE SYMPTOM



PROBABLE CAUSES



  • Malfunction of inhibitor switch system
  • Malfunction of transmission control cable
  • Malfunction of shift solenoid No.2 system
  • Malfunction of valve body (clutch control solenoid No.2)
  • Malfunction of the A/T-ECU
  • A/T internal error (brake B3, one-way clutch F1/F2/F3, etc.)

DIAGNOSIS PROCEDURE

STEP 1. M.U.T.-III data list
Item 34: Inhibitor switch (Refer to data list reference table ).

Q. Is the check result normal?
Go to Step 3.
Go to Step 2.

STEP 2. Inhibitor switch continuity check
Refer to .

Q. Is the check result normal?
Go to Step 3.
Replace the inhibitor switch.

STEP 3. M.U.T.-III actuator test
Item 17: Shift solenoid No.2
OK: Operating sound can be heard.

Q. Is the check result normal?
Go to Step 4.
Repair the shift solenoid No.2 system.

STEP 4. Check of inhibitor switch and transmission control cable
Check the installation status of inhibitor switch and transmission control cable.

Q. Is the check result normal?
Go to Step 5.
Adjust the inhibitor switch and the transmission control cable. (Refer to .)

STEP 5. Retest the system
If the trouble symptom is not solved, replace the valve body. Then, check the trouble symptom again.

Q. Is the trouble symptom reproduced?
Go to Step 6.
This diagnosis is complete.

STEP 6. A/T-ECU replacement
(1)Replace the A/T-ECU.
(2)Test drive the vehicle.
(3)Verify that the condition described by the customer exists.

Q. Is the trouble symptom reproduced?
Check the clutches and brakes for damage, and replace if necessary. (It is highly possible that the brake B3, and one-way clutch F1/F2/F3 that operate at shift change between 1st and 2nd are damaged.)
This diagnosis is complete.