For safety reasons, the APP sensor is designed as a breakerless double sensor.
1 PCM
2 Gateway (GEM)
3 APP sensor
In this system, the signal from APP sensor 1 is transmitted directly as a Pulse Width Modulation signal to the PCM.
The APP sensor 2 signal is transmitted as an analog signal to the GEM.
In the GEM the APP 2 signal is digitized, then put onto the CAN data bus and transferred to the PCM.
Effects of faults
If APP sensor 2 fails, the engine runs with decreased acceleration. However, it is still possible to achieve top speed.
If APP sensor 1 or the entire APP sensor system fails, the engine is regulated to an increased idling speed after the BPP switch and the stoplamp switch have been actuated once and a plausibility check has been carried out. It is possible to continue driving but with greatly reduced power output.