The throttle position sensor provides a signal to the ECM that is related to the relative throttle plate position. As the throttle plate moves in relation to driving conditions, a signal is sent to the control unit which adjusts the injector pulse width and air/fuel ratio. As the throttle plate is opened further, more air is taken into the combustion chambers, and as a result the relative fuel demand of the engine changes. The throttle position sensor relays this information to the ECM which in alters the fuel amount.
Removal & Installation
2.5L SOHC Engine
- Disconnect the negative battery cable.
- Disconnect the sensor connector.
- Remove the sensor retaining screws. Remove the sensor from its mounting.
- Installation is the reverse of the removal procedure.
- Tighten the sensor to 1.7 ft. lbs.
- To adjust the sensor, turn the ignition switch OFF. Loosen the retaining screws.
- Using a voltage meter, take out the ECM. Turn the ignition switch ON.
- Adjust the TPS to the proper position to allow the voltage signal to the ECM to be within specification.
- Specification is 0.45-0.55 volt. Specification is measured at connector B135 and terminal 13.
- Tighten the retaining screws.
2.5L DOHC Engine
- Turn the ignition switch OFF.
- Disconnect the connector from the ECM.
- Measure the resistance between the ECM connectors (connector B136 terminal 18/connector B136 and terminal 16).
- If the measured value is more than 1 Mohm, replace the electric throttle.
- Visually inspect the throttle linkage and throttle for binding and sticking.
- Measure the resistance of the harness between the TPS connector and engine ground, (connector E13 terminal 3 and ground).
- If the measured value is more than 1 Mohm, replace the sensor.