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TROUBLESHOOTING AUTOMATIC TRANSMISSION 23A-87 STEP 4. Engine system check Q: Is the check result normal? YES : Replace the A/T-ECU. NO : Repair the engine system. Inspection Procedure 7: Shift Shock when Shifting from N to D and Long Delay COMMENTS ON TROUBLE SYMPTOM 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 A/T-ECU DIAGNOSIS PROCEDURE STEP 1. M.U.T.-III actuator test 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. M.U.T.-III data list Q: Is the check result normal? YES : Go to Step 3. NO : Refer to diagnosis code P1766: Input shaft STEP 3. M.U.T.-III data list ). Q: Is the check result normal? YES : Go to Step 4. NO : Replace the 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 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. M.U.T.-III data list ). Q: Is the check result normal? YES : Go to Step 8. NO : Check the throttle position sensor system STEP 8. Valve body disassembly clean and solenoid valve and valve body for damage. (2) Test drive the vehicle. customer exists. Q: Does a malfunction take place again? YES : Go to Step 9. NO : The inspection is complete. STEP 9. Underdrive clutch check Q: Is the check result normal? YES : The inspection is complete. NO : Repair or replace the underdrive clutch. |