Linear Throttle Position Sensor Terminal Identification

Vcc

Voltage Constant Control

Regulated 5 volt reference

VTA

Voltage Throttle Angle

Analog signal voltage representing throttle angle

IDL

Idle Switch

Digital signal voltage representing closed throttle position

E2

Earth Ground

Sensor ground return path

The sensor and ECU are wired as shown in the diagram. As the throttle valve opens, the sensor VTA contact moves closer to the voltage source, causing a signal voltage increase.

At closed throttle, the IDL contact is held closed. This pulls the IDL signal circuit to ground. As the throttle opens, the IDL contact breaks, causing the digital IDL signal voltage to go from low to high. These signal characteristics are depicted in the accompanying graph.

Resistors R1 and R2 provide self diagnostic capabilities and allow for a fail-safe voltage at the ECU in the event of an open circuit. These two resistors have a very high resistance value and essentially have no electrical effect on the circuit under normal operating conditions. They will, however, affect the open circuit voltage measured on the VTA wire at the ECU.

Rechter Winkel Messen
Do It Yourself Car Diagnosis

Do It Yourself Car Diagnosis

Don't pay hundreds of dollars to find out what is wrong with your car. This book is dedicated to helping the do it yourself home and independent technician understand and use OBD-II technology to diagnose and repair their own vehicles.

Get My Free Ebook


Responses

  • valentina
    What is vc vta idl and e2?
    4 months ago

Post a comment