Throttle Position Sensor: Testing and Inspection

Required special tool:
- MB991348: Test Harness Set


1. Disconnect the throttle position sensor connector.




2. Measure resistance between the throttle position sensor side connector terminal 1 and terminal 4.

Standard value: 3.5 - 6.5 kOhm

Normal Condition:

3. Measure resistance between the throttle position sensor side connector terminal 1 and terminal 3.
4. If resistance is outside the standard value, or if it doesn't change smoothly, replace the throttle position sensor. NOTE After replacement, the throttle position sensor should be adjusted.





1. Disconnect the throttle position sensor connector and connect the test harness special tool (MB991348) in between. (All terminals should be connected.)
2. Connect the oscilloscope probe to the throttle position sensor side connector terminal 3.
3. Turn the ignition switch to the "ON" position.




4. Slowly move the throttle lever from the idle position to the full-throttle position and check then if the waveform is free from any noise.
5. If any noise is recognized, replace the throttle position sensor.

NOTE: After replacement, the throttle position sensor should be adjusted.