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TROUBLESHOOTING <A/T> AUTOMATIC TRANSMISSION (FF) 23A-75 OPERATION • Solenoid valve closes or opens according to the signals from the engine-A/T-ECU. • The engine-A/T-ECU energises or deenergises solenoid valve, based on input signals such as DIAGNOSIS CODE SET CONDITIONS If the drive terminal voltage of the torque converter POSSIBLE CAUSES • Malfunction of damper clutch solenoid valve • Damaged harness wires and connectors • Malfunction of the engine-A/T-ECU DIAGNOSIS STEP 1. MUT-III diagnosis code Q: Is diagnosis code 31 set? YES : Go to Step 9. NO : Go to Step 2. STEP 2. MUT-III actuator test Item 06: Damper clutch solenoid valve OK: Operating sound can be heard. Q: Is the check result normal? YES : Intermittent malfunction (Refer to GROUP 00 − How to Cope with Intermittent NO : Go to Step 3. STEP 3. Connector check: B-109 A/T control Check for the contact with terminals. Q: Is the check result normal? YES : Go to Step 4. NO : Repair the defective connector. STEP 4. Measure the resistance at A/T control Disconnect the connector, and measure the OK: 2.7 − 3.4 Ω (A/T fluid temperature 20°C) Q: Is the check result normal? YES : Go to Step 5. NO : Check the damper clutch solenoid valve and STEP 5. Measure the voltage at engine-A/T-ECU connector B-109. AC303628 B-109 (GR) Harness side AG Connector: B-109 AC303628AF B-109 (GR) Connector: B-109 Sensor side |