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


COMMENTS ON TROUBLE SYMPTOM


When the gear does not shift from 1st to 2nd and from 2nd to 1st, the cause is probably a malfunction of inhibitor switch system, transmission control cable, shift solenoid No.2 system, clutch control solenoid No.2 system, or valve body.

PROBABLE CAUSES



DIAGNOSIS PROCEDURE

STEP 1. M.U.T.-III data list

  • Refer to Data List Reference Table .

    1. Item 23: Inhibitor switch P
    2. Item 24: Inhibitor switch R
    3. Item 25: Inhibitor switch N
    4. Item 26: Inhibitor switch D

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 2: 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.