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
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STEP 1. Hydraulic pressure test
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Measure the hydraulic pressure of each element when the selector lever is in L, 2nd or
reverse.
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OK: Refer to .
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Q.
Is the check result normal?
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Go to Step 3.
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Go to Step 2.
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STEP 2. Line pressure adjustment
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(1)Adjust the line pressure (Refer to ).
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(2)Test drive the vehicle.
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(3)Verify that the condition described by the customer exists.
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Q.
Does a malfunction take place again?
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Go to Step 3.
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The inspection is complete.
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STEP 3. Check when shift shock occurs.
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Q.
Does the shift shock occur when the vehicle starts moving?
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Go to Step 4.
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Replace the oil pump assembly (Oil pump cannot be repaired).
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STEP 4. Check when shift shock occurs.
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Q.
Does the shift shock always occur?
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Go to Step 7.
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Go to Step 5.
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STEP 5. M.U.T.-III data list
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Item 11: Throttle position sensor (Refer to data list reference table ).
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Q.
Is the check result normal?
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Go to Step 6.
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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>).
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STEP 6. Engine-A/T-ECU replacement
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(1)Replace the engine-A/T-ECU.
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(2)Test drive the vehicle.
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(3)Verify that the condition described by the customer exists.
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Q.
Does a malfunction take place again?
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Go to Step 7.
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The inspection is complete.
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STEP 7. Valve body disassembly clean and assembly
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Check the bolts for looseness and the O-ring, solenoid valve s, springs and valve body
for damage.
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Q.
Is the check result normal?
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The inspection is complete.
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Replace the valve body assembly if the damages are thought to be irreparable.
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