Hyundai Elantra CN7 Quiz

Diagnostic Trouble Code Troubleshooting Procedures - DTCs P0743, P0740

In this manual: Diagnostic Trouble Code Troubleshooting Procedures - DTCs P0743, P0740
Repair and Maintenance Manual for Hyundai Elantra — 0General Information — 0Engine - Mechanical (DOHC 1.8L/2.0L) — 0Engine - Mechanical (DOHC 1.6L) — 0Engine Electrical Equipment — 0Emission Control System — 0Fuel system — 0Clutch — 0Transmission — 0Wheel Drive Shaft and Axle — 0Suspension — 0Steering — 0
~1min read
DTC P0743, P0740: Torque Converter Clutch Solenoid Valve and Circuit Possible Cause
If the resistance of the torque converter clutch solenoid valve is outside the specified range (too low or too high), a short or open circuit in the solenoid valve circuit is likely to have occurred, and DTC P0743 is stored in the ECU memory.

If the duty ratio of the torque converter clutch solenoid valve is 100% for 4 seconds or longer, the torque converter clutch control system is considered to be malfunctioning, and DTC P0740 is stored in the ECU memory. When DTC P0743 occurs, the transaxle enters fail-safe mode (shift control disabled) and is fixed in 3rd gear.

If the torque converter clutch remains engaged for 10 seconds when the automatic transaxle ECU attempts to disengage it, the torque converter clutch is considered to be stuck, and DTC P0740 is stored in the ECU memory.

 Torque converter clutch solenoid valve malfunction Poor contact in connector Automatic transaxle control module (ECU) malfunction
Процедуры проверки по диагностическим кодам неисправностей - Код Р0731

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