Inspection Procedure 9: Shift shock when shifting from N to D, N to R and long delay


COMMENTS ON TROUBLE SYMPTOM


If abnormal shock or delay of two seconds or more occurs when the selector lever is shifted from N to D range and from N to R range while the engine is idling, the cause is probably abnormal line pressure or a malfunction of the oil pump, valve body.

PROBABLE CAUSES



DIAGNOSIS PROCEDURE

STEP 1. Hydraulic pressure test
Measure the hydraulic pressure of each element when the selector lever is in L, 2nd or reverse.
OK: Refer to .

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

STEP 2. Line pressure adjustment
(1)Adjust the line pressure (Refer to ).
(2)Test drive the vehicle.
(3)Verify that the condition described by the customer exists.

Q. Does a malfunction take place again?
Go to Step 3.
The inspection is complete.

STEP 3. Check when shift shock occurs.

Q. Does the shift shock occur when the vehicle starts moving?
Go to Step 4.
Replace the oil pump assembly (Oil pump cannot be repaired).

STEP 4. Check when shift shock occurs.

Q. Does the shift shock always occur?
Go to Step 7.
Go to Step 5.

STEP 5. M.U.T.-III data list
Item 11: Throttle position sensor (Refer to data list reference table ).

Q. Is the check result normal?
Go to Step 6.
Check the throttle position sensor system (Refer to GROUP 13A, Troubleshooting <Except for Hong Kong and Singapore> or Refer to GROUP 13B, Troubleshooting <Vehicles for Hong Kong and Singapore>).

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

Q. Does a malfunction take place again?
Go to Step 7.
The inspection is complete.

STEP 7. Valve body disassembly clean and assembly
Check the bolts for looseness and the O-ring, solenoid valve s, springs and valve body for damage.

Q. Is the check result normal?
The inspection is complete.
Replace the valve body assembly if the damages are thought to be irreparable.