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TROUBLESHOOTING <A/T> AUTOMATIC TRANSMISSION (FF) 23A-79 DIAGNOSIS STEP 1. MUT-III diagnosis code Either of diagnosis codes 41, 42, 43, 44 or 46 is set, Q: Are diagnosis codes 22 or 23 output? YES <diagnosis code 22 is set> : Refer to diagnosis code 22 input shaft speed sensor YES <diagnosis code 23 is set> : Refer to diagnosis code 23 output shaft speed NO : Go to Step 2. STEP 2. MUT-III diagnosis code Either of diagnosis codes 41, 42, 43, 44 or 46 is set, Q: Is either of diagnosis code 31, 32, 33, 34 output? YES <diagnosis code 31 is set> : Refer to diagnosis code 31: Low-reverse solenoid . YES <diagnosis code 32 is set> : Refer to diagnosis code 32: Underdrive solenoid . YES <diagnosis code 33 is set> : Refer to diagnosis code 33: Second solenoid valve YES <diagnosis code 34 is set> : Refer to diagnosis code 34: Overdrive solenoid valve NO : Go to Step 3. STEP 3. Hydraulic pressure test Each hydraulic pressure of the elements below, • diagnosis code 41: Underdrive clutch, low-reverse brake • diagnosis code 42: Underdrive clutch, second brake • diagnosis code 43: Underdrive clutch, overdrive clutch • diagnosis code 44: Overdrive clutch, second brake • diagnosis code 46: Reverse clutch, low-reverse brake OK: Refer to Hydraulic Pressure Test Q: Is the check result normal? YES : Go to Step 6. NO <some hydraulic pressures are abnormal> : Go to Step 5. NO <all hydraulic pressure are abnormal> : Go to Step 4. STEP 4. Adjust the line pressure and recheck the (1) Adjust the line pressure (Refer to (2) Test drive the vehicle. Q: Is the diagnosis code set? YES : Go to Step 5. NO : The inspection is complete. STEP 5. Disassemble, clean and assemble the O-ring, solenoid valve and valve body for (2) Test drive the vehicle. Q: Is the diagnosis code set? YES : Go to Step 7. NO : The inspection is complete. STEP 6. Replace the engine-A/T-ECU and then Q: Is the diagnosis code set? YES : Go to Step 7. NO : The inspection is complete. STEP 7. Check the A/T internal clutch and brake, to the output diagnosis codes, replace if |