Difference between revisions of "ECU Pinouts"

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=Jetronic=
 
=Jetronic=
 +
 +
[[Jetronic]]'s primitive management system only controlled [[Fuel|fuelling]], so the ECU is little more than an injection control unit. The control model uses a 25-pin plug, with Pin 1 at the cable end.
  
 
{| class=wikitable
 
{| class=wikitable
Line 127: Line 129:
  
 
=Motronic 1.1=
 
=Motronic 1.1=
 +
 +
Motronic 1.1 uses a much chunkier plug, fitting 55 pins into three rows. Unlike Jetronic and Motronic 1.0, pin 1 is now at the end furthest from the cable.
  
 
{| class=wikitable
 
{| class=wikitable
Line 133: Line 137:
 
|-
 
|-
 
!1
 
!1
−
|
+
|Timing Control - to [[Ignition#Coil|coil]] and [[Intake#Lambda|O2 sensor]]
 
!20
 
!20
 
|
 
|
Line 141: Line 145:
 
|-
 
|-
 
!2
 
!2
 +
|Ground
 +
!21
 +
|
 +
!39
 +
|Programming voltage - [[Diagnostic_Plug|Diagnostic Plug]]
 +
|-
 +
!3
 +
|[[Fuel#Fuel_Pump|Fuel pump]] relay control
 +
!22
 +
|[[Intake#ICV|Idle speed]] control
 +
!40
 +
|[[Aircon|A/C]] on input
 +
|-
 +
!4
 +
|Idle speed control
 +
!23
 +
|[[Intake#Lambda|O2 sensor]] heater
 +
!41
 +
|
 +
|-
 +
!5
 +
|[[Fuel#Carbon_Canister|Evaporative purge]] valve
 +
!24
 +
|Ground
 +
!42
 +
|Park/ neutral input (auto only)
 +
|-
 +
!6
 +
|[[Instruments#Tachometer|Engine Speed output]]- to instrument cluster
 +
!25
 +
|
 +
!43
 +
|
 +
|-
 +
!7
 +
|[[Intake#AFM|AFM]] input - pin 2
 +
!26
 +
|[[Intake#AFM|AFM]] common- ground pin 4
 +
!44
 +
|[[Intake#AFM|AFM]] air inlet temp- pin 1
 +
|-
 +
!8
 +
|[[CID|Cylinder ID sensor]] input
 +
!27
 +
|Start input- to ignition switch and [[Ignition#Coil|coil]]
 +
!45
 +
|[[Blue_Temp_Sensor|Coolant Temp input]]
 +
|-
 +
!9
 +
|
 +
!28
 +
|[[Intake#Lambda|O2]] input
 +
!46
 +
|
 +
|-
 +
!10
 +
|[[Intake#Lambda|O2 sensor]] input
 +
!29
 +
|
 +
!47
 +
|[[Crank_Position_Sensor|Engine speed]] input
 +
|-
 +
!11
 +
|
 +
!30
 +
|
 +
!48
 +
|[[Crank_Position_Sensor|Engine speed]] input
 +
|-
 +
!12
 +
|[[Intake#AFM|AFM]] reference output- pin 3
 +
!31
 +
|[[CID|Cylinder ID sensor]] input
 +
!49
 +
|
 +
|-
 +
!13
 +
|RXO - [[Diagnostic_Plug|diagnostic plug]]
 +
!32
 +
|Fuel rate output- to instrument cluster
 +
!50
 +
|
 +
|-
 +
!14
 +
|Ground
 +
!33
 +
|
 +
!51
 +
|
 +
|-
 +
!15
 +
|[[Instruments#Check_Light|Check engine light]] - to cluster
 +
!34
 +
|
 +
!52
 +
|Closed throttle input - pin 1
 +
|-
 +
!16
 +
|[[Fuel#Injectors|Injectors]] 1,3,5
 +
!35
 +
|
 +
!53
 +
|[[Intake#Throttle_Position_Switch|WOT input]] - pin 3
 +
Note: TPS pin 2 is ground
 +
|-
 +
!17
 +
|[[Fuel#Injectors|Injectors]] 2,4,6
 +
!36
 +
|[[DME|Main relay]]
 +
!54
 +
|
 +
|-
 +
!18
 +
|Power input [[DME|main relay]]
 +
!37
 +
|Power input - to [[DME|main relay]]
 +
!55
 +
|TXD - [[Diagnostic_Plug|diagnostic plug]]
 +
|-
 +
!19
 +
|Ground
 +
!
 +
|
 +
!
 +
|
 
|}
 
|}
−
 
−
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=
 
=Motronic 1.3=

Revision as of 12:20, 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

Jetronic's primitive management system only controlled fuelling, so the ECU is little more than an injection control unit. The control model uses a 25-pin plug, with Pin 1 at the cable end.

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

Motronic 1.1 uses a much chunkier plug, fitting 55 pins into three rows. Unlike Jetronic and Motronic 1.0, pin 1 is now at the end furthest from the cable.

Pin Function Pin Function Pin Function Image
1 Timing Control - to coil and O2 sensor 20 38 Motronic1 3Pins.jpg
2 Ground 21 39 Programming voltage - Diagnostic Plug
3 Fuel pump relay control 22 Idle speed control 40 A/C on input
4 Idle speed control 23 O2 sensor heater 41
5 Evaporative purge valve 24 Ground 42 Park/ neutral input (auto only)
6 Engine Speed output- to instrument cluster 25 43
7 AFM input - pin 2 26 AFM common- ground pin 4 44 AFM air inlet temp- pin 1
8 Cylinder ID sensor input 27 Start input- to ignition switch and coil 45 Coolant Temp input
9 28 O2 input 46
10 O2 sensor input 29 47 Engine speed input
11 30 48 Engine speed input
12 AFM reference output- pin 3 31 Cylinder ID sensor input 49
13 RXO - diagnostic plug 32 Fuel rate output- to instrument cluster 50
14 Ground 33 51
15 Check engine light - to cluster 34 52 Closed throttle input - pin 1
16 Injectors 1,3,5 35 53 WOT input - pin 3

Note: TPS pin 2 is ground

17 Injectors 2,4,6 36 Main relay 54
18 Power input main relay 37 Power input - to main relay 55 TXD - diagnostic plug
19 Ground

Motronic 1.3

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