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TROUBLESHOOTING <A/T> AUTOMATIC TRANSMISSION (FF) 23A-63 • 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 low-reverse POSSIBLE CAUSES • Malfunction of low-reverse 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 36 set? YES : Go to Step 9. NO : Go to Step 2. STEP 2. MUT-III actuator test Item 01: Low-reverse 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 low-reverse solenoid valve and STEP 5. Measure the voltage at engine-A/T-ECU connector B-109. (2) Turn the ignition switch to the ON position. (3) Measure the voltage between engine-A/T-ECU connector C-114 terminal No.128 and earth. OK: System voltage Q: Is the check result normal? AC303628 B-109 (GR) Harness side AG Connector: B-109 AC303628AF B-109 (GR) Connector: B-109 Sensor side AC311284 AI Connector: C-114 <LHD> Connector: C-114 <RHD> Engine-A/T-ECU C-114 (GR) C-114 (GR) Engine-A/T-ECU Harness side 124 123 130 131 132 133 129 128 127126 135 121 144 122 |