How to Inspect the Electrical Circuit of Code P0743

How to Inspect the Electrical Circuit of Code P0743

Model : Sonata (FL)

Year Model: 2009

Fuel: Gasoline

2.4 DOHC  Transmission  Automatic Transaxle(A5GF1)  P0743 Torque Converter Clutch Circuit Electrical

Terminal and Connector Inspection 1. Many malfunctions in the electrical system are caused by poor harness and terminals. Faults can also be caused by interference from other electrical systems, and mechanical or chemical damage. 2. Thoroughly check connectors for looseness, poor connection, bending, corrosion, contamination, deterioration, or damage. 3. Has a problem been found? ▶ Repair as necessary and go to "Verification vehicle Repair" procedure ▶ Go to "Power Circuit Inspection" procedure Power Circuit Inspection 1. Disconnect "A/T SOLENOID VALVE" connector. 2. Measure voltage between teminal"6" of the sensor harness connector and chassis ground. 3. Turn ignition switch OFF → ON Specification: 12V is measured only for approx. 0.5sec 4. Is voltage within specifications? ▶ Go to "Signal Circuit Inspection" procedure ▶ Check that A/T-20A Fuse in engine room junction is installed or not blown. ▶ Check for open in harness. Repair as necessary and Go to "Verification Vehicle Repair" procedure Signal Circuit Inspection Check Signal Circuit Open Inspection 1. Ignition "OFF". 2. Disconnect "A/T SOLENOID VALVE" connector and "PCM/TCM" connector 3. Measure resistance between terminal "9" of the ATM SOLENOID VALVE harness connector and terminal "17" of the TCM harness connector Specification: Approx. 0 Ω 4. Is resistance within specifications? ▶ Go to "Check signal circuit short Inspection" procedure ▶ Check for open in harness. Repair as necessary and Go to "Verification Vehicle Repair" procedure Check Signal Circuit Short Inspection 1. Ignition "OFF"". 2. Disconnect "A/T SOLENOID VALVE" connector and "PCM/TCM" connector 3. Measure resistance between terminal "9" of the ATM SOLENOID VALVE harness and chassis ground. Study Guide and Specification: Infinite 4. Is resistance within specifications? ▶ Go to "Component Inspection" procedure ▶ Check for short to ground in harness. Repair as necessary and Go to "Verification Vehicle Repair" procedure Auto Repair , Study Guide , Auto Repair , Study Guide , Auto Repair , Study Guide , Auto Repair

2009  G 2.4 DOHC  Transmission  Automatic Transaxle(A5GF1)  P0743 Torque Converter Clutch Circuit Electrical

Auto Repair , Study Guide and Component Inspection ■ Check Solenoid Valve 1. Ignition "OFF". 2. Disconnect "A/T SOLENOID VALVE" connector 3. Measure resistance between terminal "6" and terminal "9" of the ATM SOLENOID VALVE harness connector Specification : Approximately 2.7~3.4 Ω (20°C) Auto Repair and Study Guide 4. Is resistance within specifications? ▶ Go to "CHECK PCM/TCM " as below ▶ Replace TCC SOLENOID VALVE as necessary and go to "Verification Vehicle Repair" procedure Auto Repair , Study Guide , Auto Repair , Study Guide , Auto Repair , Study Guide Check PCM/TCM 1. Connect scantool to data link connector(DLC) 2. Ignition "ON" & Engine "OFF". 3. Select A/T Solenoide valve Actuator test and Operate Actuator test. 4. Can you hear operating sound for TCC SOLENOID VALVE Actuator Testing Function? ▶ Go to "Verification Vehicle Repair" procedure ▶ Replace PCM/TCM as necessary and Go to "Verificaiton Vehicle Repair" procedure ACTUATOR TEST CONDITION 1. IG SWITCH ON 2. TRANSAXLE RANGE SWITCH is normal 3. P RANGE 4. Vehicle Speed 0km/h 5. Throttle position sensor< 1V 6. IDLE SWITCH ON 7. ENGINE RPM 0 Auto Repair , Study Guide , Auto Repair , Study Guide , Auto Repair , Study Guide

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