Here is my Throttle Body:
Bosch 0280750074
I have fully pinned out the ECU and noted what each is for (along with some googling and pixelated diagrams online) I have all the data for each pin in the ecu
These are for the Throttle Pedal (PPS):
Connector "C"
22 Throttle Pedal Sensor Voltage Supply (4.75 -5.25 V)
23 Throttle Pedal Sensor Signal 1 (- 0.2 - 4.8 V)
24 Throttle Pedal Sensor Signal 1 (+ 0.2 - 4.8 V)
25 Throttle Pedal Sensor Signal 2 (- 0.1 - 2.5 V)
26 Throttle Pedal Sensor Signal 2 (+ 0.1 - 2.5 V)
-----------------------------------------------------------------------
And the Throttle Body:
Connector "E"
31 EA/CC/ISC (Throttle Body?) 4.0 - 4.6 V
32 EA/CC/ISC low (Throttle Body?) +5V
33 EA/CC/ISC high (Throttle Body?) +5V
34 EA/CC/ISC 0.3 - 0.9 V (Key on)
Connector "F"
1 EA/CC/ISC actuator motor control signal low (0.8 2.3 V)
2 EA/CC/ISC actuator motor control signal high (1.0 - 2.5V; ign off : 10 ohms)
The Throttle Body itself on the connector has 6 pins (corresponding to Connector "E" 31-34 & Connector "F" 1 & 2)
In regards to the PPS, This is what I found searching, from a mercedes Forum
link:
https://www.slkworld.com/threads/throttle-position-sensor.410345/
I did some research online while coming home on the train and I found out that the actual Throttle Pedal Position Sensor (TPS) is in fact two magnets that rotate when the accelerator is pressed and that this rotation is measured by two Hall-effect sensors on the body of the TPS. This means you can't test them by measuring their resistance - they don't work like that. Instead, you need to provide 5VDC and then you can measure their output voltage as you press the accelerator. I've attached a PDF workshop file from a CLK which shows a very similar configuration and also explains the inner workings of the TPS. I've also learnt that CTP stands for Closed Throttle Position and WOT stands for Wide Open Throttle. It's the two reference points that are used to test the TPS.
Pin 1 - Connects to N3/10 pin 29 - Should read +5V with ignition on to pin 37
Pin 2 - Not connected
Pin 3 - Connects to N3/10 pin 36 - This is the -ive point for the sensor
Pin 4 - Connects to N3/10 pin 26 - Ignition on, accelerator pedal: up (CTP) approx. 0.1-0.4 VDC to pin 36 / down (WOT) approx. 2.1-2.5 VDC to pin 36
Pin 5 - Connects to N3/10 pin 27 - Ignition on, accelerator pedal: up (CTP) approx. 0.2-0.5 VDC to pin 36 / down (WOT) approx. 4.3-4.8 VDC to pin 37
Pin 6 - Connects to N3/10 pin 37 - This is the -ive point for the sensor
This matches the values from the ECU inputs (5 pins on Connector "C") but........This has the sensor on the pedal itself, not in the engine bay like mine is. Ill be do more research to verify, but the sensor in my engine bay also is a 6 pin plug with only 5 pins used.
Hope this info helps