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 accelerator pedal position sensor
- Malfunction of oil pump
- Malfunction of valve body
- Malfunction of the A/T-ECU <4M4>
- Malfunction of the engine-A/T-ECU <6G7>
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STEP 1. Hydraulic pressure test
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Measure the hydraulic pressure of each element when the transmission is in 1st gear, 2nd
gear or reverse gear.
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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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Check the oil pump for incorrect installation, damage and etc., and replace the
oil pump assembly if necessary (The oil pump cannot be disassembled.)
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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 2: Accelerator pedal 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 accelerator pedal position sensor system (Refer to GROUP 13A - Troubleshooting,
Inspection Chart For Diagnosis Code <6G72> or GROUP
13B - Troubleshooting, Inspection Chart For Diagnosis Code <6G75> or
GROUP 13D - Troubleshooting, Inspection Chart For Diagnosis Code <4M41>).
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STEP 6. A/T-ECU <4M4> or engine-A/T-ECU <6G7> replacement
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(1)Replace the A/T-ECU <4M4> or engine-A/T-ECU <6G7>.
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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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(1)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.
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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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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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