Difference between revisions of "ECU Pinouts"

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1- timing control - to coil and O2 sensor
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20- unused
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39- Programing voltage- diagnostic conector
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2- Ground
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21- unused
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40- A/C on input
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 +
3- Fuel pump relay control
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22- idle speed control
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41-unused
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4- Idle speed control
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23- O2 sensor heater
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42- Park/ neutral input (auto only)
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5- Evaporative purge valve
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24-Ground
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6- engine speed output- to instrument cluster
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25- unused
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43- unused
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7-AFM input - pin 2
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26- AFM common- ground pin 4
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44- AFM air inlet temp- pin 1
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8- cyl. ID sensor input
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27- Start input- to ignition switch and coil
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45- coolant temp input
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9- unused
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28- O2 input
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46- unused
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10- O2 sensor input
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29- unused
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47- Engine speed input
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11- unused
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30- unused
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48-Engine speed input
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12- AFM- reference output- pin 3
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31- Cyl. ID sensor input
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49-unused
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13- RXO- diagnostic connector
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32- Fuel rate output- to instrument cluster
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50- unused
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14- Ground
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33- unused
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51- unused
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15- Check engine light - to cluster
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34- unsued
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52- Closed throttle input - pin 1
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16- injectors- 1,3,5
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35- unused
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53- WOT input - pin 3 Note- TPS pin 2 is ground
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17- injectors- 2,4,6
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36- Main relay
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54- unused
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18- Power input main relay
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37- Power input - to main relay
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55- TXD- diagnostic Connector
 +
 +
19- Ground
 +
 +
38- unused
 +
 +
=Motronic 1.3=

Revision as of 09:39, 17 February 2012

The ECU is the very heart of your engine management system. Almost everything under the bonnet, and a lot of the stuff inside the car, connects to it in some way.

When things start going wrong, it's essential to check that signals are getting to or coming from the ECU, and that means testing the wiring. To help you identify what goes where, here are the pinouts for each generation of E30 ECU.

Jetronic

Pin Function Pin Function Image
1 14 JetronicPins.jpg

Motronic 1.0

The Motronic 1.0 ECU employs a 35-pin plug to connect to all the engine bay components.

Pin Function Pin Function Image
1 Ignition coil output 19 Ground Motronic1 0Pins.jpg
2 Idle switch 20 Main relay
3 WOT switch 21 Tachometer
4 Cranking signal 22 AFM Temp sensor
5 Ground/Crank PosS Gnd 23 Inlet Air Temp/Crank SpS Gnd
6 AFM ground 24 O2 sensor signal *
7 AFM signal 25 Crank position sensor 1
8 Crank speed sensor 1 26 Crank position sensor 2
9 AFM supply 27 Crank speed sensor 2
10 Auto only special 28 Water Pressure switch
11 Fuel consumption gauge 29 A/C switch (if installed)
12 30 +Inlet Air Temp
13 Water Temp 31
14 Injector output cyl 3&4 32
15 Injector output cyl 1&2 33 ICV pulse
16 Ground 34 ICV pulse
17 Ground 35 Injector ground
18

Motronic 1.1

Pin Function Pin Function Pin Function Image
1 20 38 Motronic1 3Pins.jpg
2

1- timing control - to coil and O2 sensor

20- unused

39- Programing voltage- diagnostic conector

2- Ground

21- unused

40- A/C on input

3- Fuel pump relay control

22- idle speed control

41-unused

4- Idle speed control

23- O2 sensor heater

42- Park/ neutral input (auto only)

5- Evaporative purge valve

24-Ground

6- engine speed output- to instrument cluster

25- unused


43- unused

7-AFM input - pin 2

26- AFM common- ground pin 4

44- AFM air inlet temp- pin 1

8- cyl. ID sensor input

27- Start input- to ignition switch and coil

45- coolant temp input

9- unused

28- O2 input

46- unused

10- O2 sensor input

29- unused

47- Engine speed input

11- unused

30- unused

48-Engine speed input

12- AFM- reference output- pin 3

31- Cyl. ID sensor input

49-unused

13- RXO- diagnostic connector

32- Fuel rate output- to instrument cluster

50- unused

14- Ground

33- unused

51- unused

15- Check engine light - to cluster

34- unsued

52- Closed throttle input - pin 1

16- injectors- 1,3,5

35- unused

53- WOT input - pin 3 Note- TPS pin 2 is ground

17- injectors- 2,4,6

36- Main relay

54- unused

18- Power input main relay

37- Power input - to main relay 55- TXD- diagnostic Connector

19- Ground

38- unused

Motronic 1.3

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