Description Template

DATA TROUBLE CODE: 41 / 47

SYSTEM: Throttle Position Sensor(s) Circuit

CIRCUIT DESCRIPTION

Throttle Position Sensor, Sub-Throttle Position Sensor And Sub-Throttle Actuator Circuit:

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 closed (ON), so the voltage at the terminal IDL of the ECM is 0.0 volts. At this time, a voltage of approximately 0.7 volts is applied to the terminal VTA of the ECM.

When the throttle valve is opened, the IDL contacts open (OFF) and thus the power source voltage of approximately 12.0 volts in the ECM is applied to the terminal IDL of the ECM. The voltage applied to the terminal VTA of the ECM 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 ECM uses the signals input from the terminals VTA and IDL to judge the vehicle driving conditions, which is one of the conditions used in calculating the air/fuel ratio correction, power increase correction, 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 (TRAC). 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.

DIAGNOSTIC TROUBLE CODE DETECTING CONDITION
DTC 41
- Open or short in throttle position sensor circuit for 0.5 seconds or more.
DTC 47
- Open or short in sub-throttle position sensor circuit for 0.5 seconds or more.

TROUBLE AREA
DTC 41
* Open or short in throttle position sensor circuit.
* Throttle position sensor.
* ECM
DTC 47
* Open or short in sub-throttle position sensor circuit.
* Sub-throttle position sensor.
* ECM

HINTS:
* 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.

WIRING DIAGRAM