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

Abnormal line pressure

Malfunction of throttle position sensor

Malfunction of oil pump

Malfunction of valve body

Malfunction of the engine-A/T-ECU

DIAGNOSIS PROCEDURE

STEP 1. Hydraulic pressure test

Measure the hydraulic pressure of each element when the selector lever is in L, 2nd or reverse (Refer to

OK: Refer to

Q: Is the check result normal?

YES: Go to Step 3

.
NO: Go to Step 2

STEP 2. Line pressure adjustment

Adjust the line pressure (Refer to ).

Test drive the vehicle.

Verify that the condition described by the customer exists.

Q: Does a malfunction take place again?

YES: Go to Step 3

.
NO: The inspection is complete.

STEP 3. Check when shift shock occurs.

Q: Does the shift shock occur when the vehicle starts moving?

YES: Go to Step 4

.
NO: Check the oil pump for incorrect installation, damage and etc., and replace the oil pump assembly if necessary (The oil pump cannot be disassembled.)

STEP 4. Check when shift shock occurs.

Q: Does the shift shock always occur?

YES: Go to Step 7

.
NO: Go to Step 5

STEP 5. MUT-II/III data list

Item 11: Throttle position sensor (Refer to data list reference table

Q: Is the check result normal?

YES: Go to Step 6

.
NO: Check the throttle position sensor system (Refer to GROUP 13A, Troubleshooting

<4G63>, GROUP 13B, Troubleshooting

<4G64>, Refer to GROUP 13C, Troubleshooting

<4G69>).

STEP 6. Engine-A/T-ECU replacement

Replace the engine-A/T-ECU.

Test drive the vehicle.

Verify that the condition described by the customer exists.

Q: Does a malfunction take place again?

YES: Go to Step 7

.
NO: The inspection is complete.

STEP 7. Valve body disassembly clean and assembly

Check the bolts for looseness and the O-ring, solenoid valve and valve body for damage.

Q: Is the check result normal?

YES: The inspection is complete.
NO: Replace the valve body assembly if the damages are thought to be irreparable.



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 Abnormal line pressure Malfunction of throttle position sensor Malfunction of oil pump Malfunction of valve body Malfunction of the engine-A/T-ECU
DIAGNOSIS PROCEDURE

STEP 1. Hydraulic pressure test Measure the hydraulic pressure of each element when the selector lever is in L, 2nd or reverse (Refer to ). OK: Refer to . Q: Is the check result normal? YES: Go to Step 3. NO: Go to Step 2.
STEP 2. Line pressure adjustment Adjust the line pressure (Refer to ). Test drive the vehicle. Verify that the condition described by the customer exists. Q: Does a malfunction take place again? YES: Go to Step 3. NO: The inspection is complete.
STEP 3. Check when shift shock occurs. Q: Does the shift shock occur when the vehicle starts moving? YES: Go to Step 4 . NO: Check the oil pump for incorrect installation, damage and etc., and replace the oil pump assembly if necessary (The oil pump cannot be disassembled.)
STEP 4. Check when shift shock occurs. Q: Does the shift shock always occur? YES: Go to Step 7 . NO: Go to Step 5.
STEP 5. MUT-II/III data list Item 11: Throttle position sensor (Refer to data list reference table ). Q: Is the check result normal? YES: Go to Step 6. NO: Check the throttle position sensor system (Refer to GROUP 13A, Troubleshooting <4G63>, GROUP 13B, Troubleshooting <4G64>, Refer to GROUP 13C, Troubleshooting , <4G69>).
STEP 6. Engine-A/T-ECU replacement Replace the engine-A/T-ECU. Test drive the vehicle. Verify that the condition described by the customer exists. Q: Does a malfunction take place again? YES: Go to Step 7 . NO: The inspection is complete.
STEP 7. Valve body disassembly clean and assembly Check the bolts for looseness and the O-ring, solenoid valve and valve body for damage. Q: Is the check result normal? YES: The inspection is complete. NO: Replace the valve body assembly if the damages are thought to be irreparable.