EG–552 ENGINE – 2JZ–GTE ENGINE TROUBLESHOOTING DTC 41 47 Throttle Position Sensor(s) Circuit CIRCUIT DESCRIPTION The throttle position sensor is mounted in the throttle body and detects the the throttle valve opening angle. When the throttle valve is fully closed, the IDL contacts in the throttle position sensor are on, so the voltage at the terminal IDL of the ECM becomes 0 V. At this time, a voltage of approximately 0.7 V is applied to the terminal VTA of the ECM. When the throttle valve is opened, the IDL contacts go off and thus the power source voltage of approximately 12 V in the ECM is applied to the terminal IDL of the ECM. The voltage applied to the terminal VTA of the ECM increases in the proportion to the opening angle of the throttle valve and becomes approximately 3.2 – 4.9 V when the throttle valve is fully opened. The ECM judges the vehicle driving conditions from these signals input from the terminals VTA and IDL, and uses them as one of the conditions for deciding the air–fuel ratio correction, power increase corrections and fuel–cut control etc. The sub–throttle position sensor is built and operates in the same way as the main throttle position sensor. This sensor is used for traction control. The sub–throttle valve is opened and closed by the sub–throttle actuator according to signals from the TRAC ECU to control the engine output. Throttle Position Sensor Engine Control Module 5 V VCC B+ VTA IDL E2 F16480 DTC No. | Diagnostic Trobule Code Detecting Condition | Trouble Area 41 | Open or short in throttle position sensor circuit for 0.5 sec. or more | • Open or short in throttle position sensor circuit • Throttle position sensor • ECM 47 | Open or short in sub–throttle position sensor circuit for 0.5 sec. or more | • Open or short in sub–throttle position sensor circuit • Sub–throttle position sensor • ECM HINT: Diagnostic trouble code 41 is for the throttle position sensor circuit. Diagnostic trouble code 47 is for the sub–throttle position sensor circuit. • When the connector for the throttle position sensor(s) is disconnected, diagnostic trouble code 41 or 47 is not displayed. Diagnostic trouble code 41 or 47 is displayed only when there is an open or short in the VTA signal circuit of the throttle position sensor(s). • Signals from the throttle position sensor(s) are also input to the TRAC ECU, so when a malfunction occurs on the TRAC side, code 41 or 47 may be displayed.