Description
DATA TROUBLE CODE: 47SYSTEM: Sub Throttle Position Sensor Circuit
CIRCUIT DESCRIPTION
The Throttle Position Sensor is mounted in the throttle body and detects 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 Engine Control Module become 0.0 volts. At this time, a voltage of approximately 0.7 volts is applied to the terminal VTA of the Engine Control Module. When the throttle valve is opened, the IDL contacts go off and thus the power source voltage of approximately 12 volts in the Engine Control Module is applied to the terminal IDL of the Engine Control Module. The voltage applied to the terminal VTA of the Engine Control Module increases in proportion to the opening angle of the throttle valve and becomes approximately 3.2 - 4.9 volts when the throttle valve is fully opened. The Engine Control Module 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 correction 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 Electronic Control Unit to control the engine output.
DIAGNOSTIC TROUBLE CODE DETECTING CONDITION
- Open or short in Throttle Position Sensor circuit (VTA1) for 0.5 seconds or more.
OR
- IDL1 contact is ON and VTA1 output exceeds 1.5 volts for 0.5 seconds or more.
TROUBLE AREA
- Open or short in Throttle Position Sensor circuit.
OR
- Throttle Position Sensor.
- Engine Control Module.
NOTE: 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 Electronic Control Unit, So when a malfunction occurs on the TRAC side, code 41 or 47 may be displayed.
Malfunction Indicator Lamp
Normal Mode Off
Test Mode On