Inspection Procedure 8: Shift Shock When Shifting from 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 R range while the engine is idling, the cause is probably abnormal pressure in reverse clutch and low-reverse clutch or a malfunction of the reverse clutch, low-reverse brake, valve body or throttle position sensor.

PROBABLE CAUSES

Malfunction of low-reverse solenoid valve

Malfunction of input shaft speed sensor

Malfunction of the inhibitor switch

Abnormal reverse clutch pressure

Abnormal low-reverse brake pressure

Malfunction of throttle position sensor

Malfunction of the reverse clutch

Malfunction of low-reverse brake

Malfunction of valve body

Malfunction of the engine-A/T-ECU

DIAGNOSIS PROCEDURE

STEP 1. MUT-II/III actuator test

Item 01: Low-reverse solenoid valve

OK: Operating sound can be heard.

Q: Is the check result normal?

YES: Go to Step 2

.
NO: Replace the low-reverse 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 61: Inhibitor switch (Refer to data list reference table

Q: Is the check result normal?

YES: Go to Step 4

.
NO: Refer to inspection procedure 16: Inhibitor switch system

<4G63, 4G64>,

<4G69>.

STEP 4. MUT-II/III data list

Item 31: Low-reverse solenoid valve duty ratio (Refer to data list reference table

Q: Is the check result normal?

YES: Go to Step 5

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

STEP 5. Check when shift shock occurs.

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

YES: Go to Step 7

.
NO: Go to Step 6

STEP 6. Hydraulic pressure test

Measure the hydraulic pressure for reverse clutch and low-reverse clutch when the selector lever is shifted from N to R range (Refer to

OK: Refer to

Q: Is the check result normal?

YES: Go to Step 10

.
NO: Go to Step 9

STEP 7. Check when shift shock occurs.

Q: Does the shift shock always occur?

YES: Go to Step 9

.
NO: Go to Step 8

STEP 8. 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 9

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

<4G63>, GROUP 13B, Troubleshooting

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

<4G69>).

STEP 9. 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 10

.
NO: The inspection is complete.

STEP 10. Reverse clutch and low-reverse brake 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 reverse clutch and low-reverse brake.



Inspection Procedure 8: Shift Shock When Shifting from 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 R range while the engine is idling, the cause is probably abnormal pressure in reverse clutch and low-reverse clutch or a malfunction of the reverse clutch, low-reverse brake, valve body or throttle position sensor.
PROBABLE CAUSES Malfunction of low-reverse solenoid valve Malfunction of input shaft speed sensor Malfunction of the inhibitor switch Abnormal reverse clutch pressure Abnormal low-reverse brake pressure Malfunction of throttle position sensor Malfunction of the reverse clutch Malfunction of low-reverse brake Malfunction of valve body Malfunction of the engine-A/T-ECU
DIAGNOSIS PROCEDURE

STEP 1. MUT-II/III actuator test Item 01: Low-reverse solenoid valve OK: Operating sound can be heard. Q: Is the check result normal? YES: Go to Step 2 . NO: Replace the low-reverse 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 61: Inhibitor switch (Refer to data list reference table ). Q: Is the check result normal? YES: Go to Step 4. NO: Refer to inspection procedure 16: Inhibitor switch system <4G63, 4G64>, <4G69>.
STEP 4. MUT-II/III data list Item 31: Low-reverse solenoid valve duty ratio (Refer to data list reference table ). Q: Is the check result normal? YES: Go to Step 5. NO: Replace the engine-A/T-ECU.
STEP 5. Check when shift shock occurs. Q: Does the shift shock occur when the vehicle starts moving? YES: Go to Step 7 . NO: Go to Step 6.
STEP 6. Hydraulic pressure test Measure the hydraulic pressure for reverse clutch and low-reverse clutch when the selector lever is shifted from N to R range (Refer to ). OK: Refer to . Q: Is the check result normal? YES: Go to Step 10. NO: Go to Step 9.
STEP 7. Check when shift shock occurs. Q: Does the shift shock always occur? YES: Go to Step 9 . NO: Go to Step 8.
STEP 8. 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 9. NO: Check the throttle position sensor system (Refer to GROUP 13A, Troubleshooting <4G63>, GROUP 13B, Troubleshooting <4G64>, Refer to GROUP 13C, Troubleshooting , <4G69>).
STEP 9. 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 10 . NO: The inspection is complete.
STEP 10. Reverse clutch and low-reverse brake 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 reverse clutch and low-reverse brake.