306 GTI-6 TPS (Throttle Position Sensor) Testing With A Multimeter

The TPS on a Peugeot 306 GTi-6 is located under the throttle body and can be easily accessed by removing the air feed from the airbox. If it is faulty and you need to replace it you will need to remove the throttle body from the vehicle. It is highly advisable to purchase a throttle body gasket (Peugeot part number 1635 C3) before removing the throttle body.

Throttle Position Sensor on right side of throttle body in this photo
Symptoms of a faulty TPS
Many of the symptoms of a faulty TPS are similar to issues with other sensors such as MAP (click here to read another one of our posts which specifically deals with diagnosing a faulty MAP sensor), Lambda or CTS. It is therefore vital to test the suspected faulty sensor rather than assuming it is the cause of issues based on symptoms or what internet forums say. These sensors aren't cheap and you don't want to be replacing them unnecessarily.
  • Stalling
  • Hesitation
  • Jerky throttle response
  • Surging
  • Flat spots in acceleration
  • Poor MPG
  • Abnormal idle (click here to read our post on cleaning and replacing the ICV (idle control valve) which is an extremely common problem.

How to test a TPS using a multimeter

1. Supply voltage
To check the supply voltage:

1. Turn ignition off
2. Remove multiplug
3. Turn ignition on
4. Set multimeter to volts and measure between terminals 1 and 2.
5. Correct voltage is 5v.

2. Operating voltage
To check throttle position sensor is operating correctly:

1. Turn ignition off
2. Remove multiplug
3. Connect terminals using wire harness
4. Connect multimeter to wire harness and set to volts
5. Measure voltage between terminals 1 and 3.
6. Correct voltage for closed throttle is 0.2v, fully open is 5v. Slowly open the throttle and monitor voltage. Transition between closed and open voltage should be smooth with no flat spots or drops.

Simple male and female connectors
In position with multiplug removed to access terminals

Peugeot 306 Throttle Position Testing Video

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