Below limit
Above limit
1 Check wiring from DME control module, pin IV/13, to pedal sensor, pin 2, for short circuit to ground.
1. Connect special tool 9637 to wiring harness (DME control module connector).
2. Connect ohmmeter to special tool, pin IV/13, and ground.
Display: infinity ohms
If 0 - 5 ohms is displayed, check wiring for chafing and pinching damage.
2 Check wiring from DME control module, pin IV/13, to pedal sensor, pin 2, for short circuit to B+.
1. Connect special tool 9637 to wiring harness (DME control module connector).
2. Connect voltmeter to special tool, pin IV/13, and ground.
3. Switch on the ignition.
Display: 0 V
If battery voltage is displayed, check wiring harness for chafing and pinching damage.
Accelerator Pedal Potentiometer 2 - Below Limit
P1578
Accelerator Pedal Potentiometer 2 - Below Limit
Function
The angle (position) of the accelerator pedal is calculated from the potentiometer voltage of the pedal sensor. The pedal sensor features two
potentiometers which each have an independent 5-volt supply from the DME control module.
The second potentiometer is equipped with a series resistor the size of the bulk resistance, so that its characteristic only has half the inclination of
potentiometer 1. Various plausibility tests (voltage range, constant velocity, etc.) ensure that a single error cannot cause the angle of the accelerator
pedal to take on a higher value than the actual pedal position.
Diagnosis conditions
- Ignition on (approx. 30 sec.)
- Battery voltage > 7 V