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TROUBLESHOOTING <A/T> AUTOMATIC TRANSMISSION (FF) 23A-103 INSPECTION PROCEDURE 3: Does not move forward COMMENTS ON TROUBLE SYMPTOM POSSIBLE CAUSES • Malfunction of underdrive solenoid valve • Malfunction of inhibitor switch • Abnormal line pressure • Malfunction of the underdrive clutch • Malfunction of valve body • Malfunction of the engine-A/T-ECU DIAGNOSIS STEP 1. MUT-II/III 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 diagnosis code Either of diagnosis codes 27 or 28 is set, inhibtor Q: Are diagnosis codes 27 or 28 output? YES <diagnosis code 27 is set> : Refer to diagnosis code 27: Inhibitor switch system YES <diagnosis code 28 is set> : Refer to diagnosis code 28: Inhibitor switch system NO : Go to Step 3. STEP 3. Underdrive solenoid valve check solenoid valve. OK: Operating sound can be heard. Q: Is the check result normal? YES : Go to Step 4. NO : Replace the engine-A/T-ECU. STEP 4. Hydraulic pressure test Measure the hydraulic pressure of the underdrive OK: Refer to . Q: Is the check result normal? YES : Go to Step 7. NO : Go to Step 5. STEP 5. Engine-A/T-ECU replacement customer exists. Q: Does a malfunction take place again? YES : Go to Step 6. NO : The inspection is complete. STEP 6. 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 7. NO : The inspection is complete. STEP 7. Underdrive clutch check ring for damage and interference with the (2) Test drive the vehicle. customer exists. Q: Is the check result normal? YES : The inspection is complete. NO : Repair or replace the underdrive clutch. |