Throttle/Pedal Position Sensor/Switch "D"/"E" Voltage Correlation

Possible causes

• CommonFailed throttle or pedal position sensor
• CommonCorroded or damaged connector
• CommonWiring damage, particularly at the pedal where feet catch the harness
• CommonLoss of the 5 volt reference or the sensor earth
• PossibleCarbon on the throttle plate affecting the reported position
• PossibleSensor not calibrated after replacement

What you might notice

• Reduced power mode
• Hesitation or surging
• Engine not responding to the pedal
• Rough or unstable idle
• Warning light for reduced engine power

What to check, in order

1. Watch both sensors of the pair together through the full pedal travel. The one that does not track the other is the fault.
2. Check the shared reference voltage and earth first - a marginal reference makes two healthy sensors disagree.
3. Watch all the pedal and throttle position readings together on the live data screen while pressing the pedal slowly through its full travel. The one that jumps, sticks or does not follow the others is the fault.
4. Check the reference voltage and earth at the sensor. Several sensors usually share these, so a lost reference produces a scatter of codes from healthy sensors.
5. Inspect the connector for corrosion and water, and the harness at the pedal for damage.
6. Look for other codes sharing the same reference circuit before condemning this sensor.
7. On most vehicles the pedal sensors are part of the pedal assembly and are not supplied separately - establish that before ordering.