Throttle Position Sensor

The Throttle Position Sensor is a potentiometer attached to the Throttle Body which notifies the ECU about the position of the throttle. Among other things it helps the engine maintain a stable idle speed.

Replacement

It's often sold and replaced as part of the throttle body itself however can be replaced separately.

Common Faults

The Throttle Position Sensor (TPS) is sensitive to heat, moisture and vibration leading to the failure of some units. The sensor is a sealed unit and cannot be repaired only replaced. A TPS may fail gradually leading to a number of symptoms which can include one or more of the following:

- Poor idle control: The TPS is used by the ECU to determine if the throttle is closed and the car should be using the Idle Air Control Valve exclusively for idle control. A fault TPS sensor can confuse the ECU causing the idle to be erratic or "hunting".

- High Idle Speed: The TPS may report faulty values causing the engine idle speed to be increased above normal. This is normally found in conjunction with a slow engine return to idle speed symptom.

- Slow engine return to idle: A failing TPS can report the minimum throttle position values incorrectly which can stop the engine entering idle mode when the throttle is closed. Normally when the throttle is closed the engine fuel injectors will be deactivated until a defined engine RPM speed is reached and the engine brought smoothly to idle speed. When failing a TPS will not report the throttle closed and fueling will continue causing the engine to return to idle very slowly.

- Engine Hesitation on Throttle Application: The TPS is also used by the ECU to determine if the driver has applied the throttle quicker than the Manifold Air Pressure sensor can read. The fueling is adjusted acordingly to cope with the sudden increase in air volume, however a faulty sensor can cause the ECU to ignore this data and the engine will "hesitate" when applying the throttle. In extreme cases with the engine at idle, a sudden application of full throttle can stall the engine.

- Engine Misfire: A fault TPS can report values outside the deined acceptable range causing the ECU to incorrectly fuel the engine. This is noticable as a slight misfire and can trigger the misfire detection software and/or Malfunction Indicator Lamp (MIL) light on the dashboard. Extreme cases can cause excessing misfires resulting in one or more cylinders being shut down to prevent engine and catalytic converter damage.

Manual Recalibration

In all cases a manual recalibration of the TPS may resolve the issues at least on a temporary basis. To recalibrate the TPS:

1) With the engine off, insert the key and turn the ignition to position 2 (On) without starting the engine

2) Slowy press and release the accelerator pedal a few times (recommend at least 4-5) from fully closed to full wide open throttle. This will teach the ECU the minimum and maximum voltage values the TPS will report at idle and full throttle. The ECU will linearly extrapolate appropratie values for all other throttle settings.

3) Turn the ignition off and remove the key.

4) Start car as normal.

--Ads green 14:33, 17 January 2007 (GMT)