Throttle Position Sensor: Testing and Inspection

THROTTLE POSITION SENSOR CHECK

Required Special Tool:
- MB991348: Test Harness Set

Checking the Terminal Resistance
1. Disconnect the thrdttle position sensor connector.
2. Measure the resistance between throttle position sensor side connector terminals 1 and 4.
Standard value: 3.5 - 6.5 kOhms
3. Measure the resistance between throttle position sensor side connector terminals 1 and terminal 3.

Normal condition:
Throttle valve slowly open Changes smoothly in proportion to the
fully open from the idle opening angle of the throttle valve
position

4. If the 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.








Check using oscilloscope

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.