Inspection Procedure 7: Shift Shock When Shifting from N to D 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 while the engine is idling, the cause is probably abnormal underdrive clutch pressure or a malfunction of the underdrive clutch, valve body or throttle position sensor.

PROBABLE CAUSES

Malfunction of underdrive solenoid valve

Malfunction of input shaft speed sensor

Abnormal underdrive clutch pressure

Malfunction of throttle position sensor

Malfunction of the underdrive clutch

Malfunction of valve body

Malfunction of the engine-A/T-ECU

DIAGNOSIS PROCEDURE

STEP 1. MUT-II actuator test

Item 02: Underdrive solenoid valve

OK: Operating sound can be heard.

Q: Is the check result normal?

YES: Go to Step 2

.
NO: Replace the underdrive solenoid valve.

STEP 2. MUT-II/III data list

Item 22: Input shaft speed sensor (Refer to data list reference table

) <Except for Hong Kong spec.>.
Item 01: Input shaft speed sensor (Refer to data list reference table

) <Vehicles for Hong Kong spec.>.

Q: Is the check result normal?

YES: Go to Step 3

.
NO: Refer to diagnosis code 22: Input shaft speed sensor system

<4G63, 4G64>,

<4G69>.

STEP 3. MUT-II/III data list

Item 32: Underdrive solenoid valve duty ratio (Refer to data list reference table

Q: Is the check result normal?

YES: Go to Step 4

.
NO: Replace the engine-A/T-ECU.

STEP 4. Check when shift shock occurs.

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

YES: Go to Step 6

.
NO: Go to Step 5

STEP 5. Hydraulic pressure test

Measure the hydraulic pressure for underdrive clutch when the selector lever is shifted from N to D range (Refer to

OK: Refer to

Q: Is the check result normal?

YES: Go to Step 9

.
NO: Go to Step 8

STEP 6. Check when shift shock occurs.

Q: Does the shift shock always occur?

YES: Go to Step 8

.
NO: Go to Step 7

STEP 7. 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 8

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

<4G63>, GROUP 13B, Troubleshooting

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

<4G69>).

STEP 8. Valve body disassembly clean and assembly

Check the bolts for looseness and the O-ring, solenoid valve and valve body for damage.
Replace the valve body assembly if the damages are thought to be irreparable.

Test drive the vehicle.

Verify that the condition described by the customer exists.

Q: Does a malfunction take place again?

YES: Go to Step 9

.
NO: The inspection is complete.

STEP 9. Underdrive clutch check

Check the facing for seizure and the piston seal ring for damage and interference with the retainer.

Q: Is the check result normal?

YES: The inspection is complete.
NO: Repair or replace the underdrive clutch.



Inspection Procedure 7: Shift Shock When Shifting from N to D 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 while the engine is idling, the cause is probably abnormal underdrive clutch pressure or a malfunction of the underdrive clutch, valve body or throttle position sensor.
PROBABLE CAUSES Malfunction of underdrive solenoid valve Malfunction of input shaft speed sensor Abnormal underdrive clutch pressure Malfunction of throttle position sensor Malfunction of the underdrive clutch Malfunction of valve body Malfunction of the engine-A/T-ECU
DIAGNOSIS PROCEDURE

STEP 1. MUT-II actuator test Item 02: Underdrive solenoid valve OK: Operating sound can be heard. Q: Is the check result normal? YES: Go to Step 2 . NO: Replace the underdrive solenoid valve.
STEP 2. MUT-II/III data list Item 22: Input shaft speed sensor (Refer to data list reference table ) <Except for Hong Kong spec.>. Item 01: Input shaft speed sensor (Refer to data list reference table ) <Vehicles for Hong Kong spec.>. Q: Is the check result normal? YES: Go to Step 3. NO: Refer to diagnosis code 22: Input shaft speed sensor system <4G63, 4G64>, <4G69>.
STEP 3. MUT-II/III data list Item 32: Underdrive solenoid valve duty ratio (Refer to data list reference table ). Q: Is the check result normal? YES: Go to Step 4. NO: Replace the engine-A/T-ECU.
STEP 4. Check when shift shock occurs. Q: Does the shift shock occur when the vehicle starts moving? YES: Go to Step 6 . NO: Go to Step 5.
STEP 5. Hydraulic pressure test Measure the hydraulic pressure for underdrive clutch when the selector lever is shifted from N to D range (Refer to ). OK: Refer to . Q: Is the check result normal? YES: Go to Step 9. NO: Go to Step 8.
STEP 6. Check when shift shock occurs. Q: Does the shift shock always occur? YES: Go to Step 8 . NO: Go to Step 7.
STEP 7. 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 8. NO: Check the throttle position sensor system (Refer to GROUP 13A, Troubleshooting <4G63>, GROUP 13B, Troubleshooting <4G64>, Refer to GROUP 13C, Troubleshooting , <4G69>).
STEP 8. Valve body disassembly clean and assembly Check the bolts for looseness and the O-ring, solenoid valve and valve body for damage. Replace the valve body assembly if the damages are thought to be irreparable. Test drive the vehicle. Verify that the condition described by the customer exists. Q: Does a malfunction take place again? YES: Go to Step 9 . NO: The inspection is complete.
STEP 9. Underdrive clutch check Check the facing for seizure and the piston seal ring for damage and interference with the retainer. Q: Is the check result normal? YES: The inspection is complete. NO: Repair or replace the underdrive clutch.