Difference between revisions of "ECU Pinouts"

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|-
 
|-
 
!10
 
!10
−
|[[Intake#Lambda|O2 sensor]] input
+
|[[Intake#Lambda|O2 sensor]] ground
 
!29
 
!29
 
|
 
|
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=Motronic 1.3=
 
=Motronic 1.3=
 +
 +
[[Motronic_1.3|Motronic 1.3]] uses the same [[Engine_Loom|engine loom]] as Motronic 1.1, and therefore the 55-pin plug remains the same. However, the small differences that crept into production during the lifetime of Motronic 1.3 mean that a few extra wires are in place, to control features such as [[ABS]].
 +
 +
{| class=wikitable
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|-
 +
!Pin!!Colour!!Function!!Pin!!Colour!!Function!!Pin!!Colour!!Function!!Image
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|-
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!1
 +
|BK
 +
|Timing Control - to [[Ignition#Coil|coil]] and [[Intake#Lambda|O2 sensor]]
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!20
 +
|
 +
|
 +
!38
 +
|
 +
|[[ABS]] and [[On-board_Computer|OBC]] cutoff for [[Fuel#Injectors|Injectors]]
 +
|rowspan=19|[[Image:Motronic1_3Pins.jpg]]
 +
|-
 +
!2
 +
|BR
 +
|Ground
 +
!21
 +
|
 +
|
 +
!39
 +
|GN/BU
 +
|Programming voltage - [[Diagnostic_Plug|Diagnostic Plug]]
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|-
 +
!3
 +
|BR/GN
 +
|[[Fuel#Fuel_Pump|Fuel pump]] relay control
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!22
 +
|WT/GN
 +
|[[Intake#ICV|Idle speed]] Close control
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!40
 +
|BK/GY
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|[[Aircon|A/C]] low pressure cutoff
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|-
 +
!4
 +
|WT/YL
 +
|Idle speed control
 +
!23
 +
|BR/GR
 +
|[[Intake#Lambda|O2 sensor]] heater
 +
!41
 +
|VI/GY
 +
|[[Aircon|A/C]] On input
 +
|-
 +
!5
 +
|BR
 +
|[[Fuel#Carbon_Canister|Evaporative purge]] valve
 +
!24
 +
|BR
 +
|Ground
 +
!42
 +
|RD/BU
 +
|Park/ neutral input (auto only)
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|-
 +
!6
 +
|BK
 +
|[[Instruments#Tachometer|Engine Speed output]]- to instrument cluster
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!25
 +
|
 +
|
 +
!43
 +
|
 +
|
 +
|-
 +
!7
 +
|GY/YL
 +
|[[Intake#AFM|AFM]] input - pin 2
 +
!26
 +
|GY/BU
 +
|[[Intake#AFM|AFM]] common- ground pin 4
 +
!44
 +
|GY/VI
 +
|[[Intake#AFM|AFM]] air inlet temp- pin 1
 +
|-
 +
!8
 +
|BL
 +
|[[CID|Cylinder ID sensor]] input
 +
!27
 +
|GN
 +
|Start input- to ignition switch and [[Ignition#Coil|coil]] from [[On-board_Computer|OBC]]
 +
!45
 +
|BR/RD
 +
|[[Blue_Temp_Sensor|Coolant Temp input]]
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|-
 +
!9
 +
|
 +
|
 +
!28
 +
|BK
 +
|[[Intake#Lambda|O2]] input
 +
!46
 +
|
 +
|
 +
|-
 +
!10
 +
|YL
 +
|[[Intake#Lambda|O2 sensor]] ground
 +
!29
 +
|BK/WT
 +
|Vehicle Speed input from [[Instruments#Dash_Cluster|instrument cluster]]
 +
!47
 +
|BL
 +
|[[Crank_Position_Sensor|Engine speed]] input
 +
|-
 +
!11
 +
|
 +
|
 +
!30
 +
|
 +
|
 +
!48
 +
|YL
 +
|[[Crank_Position_Sensor|Engine speed]] input
 +
|-
 +
!12
 +
|GY/WT
 +
|[[Intake#AFM|AFM]] reference output- pin 3
 +
!31
 +
|YL
 +
|[[CID|Cylinder ID sensor]] input
 +
!49
 +
|
 +
|
 +
|-
 +
!13
 +
|WT/YL
 +
|RXO - [[Diagnostic_Plug|diagnostic plug]]
 +
!32
 +
|WT/BL
 +
|Fuel rate output- to instrument cluster
 +
!50
 +
|
 +
|[[ABS]] Deceleration Fuel Cut-Off Overide
 +
|-
 +
!14
 +
|BR
 +
|[[Fuel#Injectors|Injector]] Ground
 +
!33
 +
|
 +
|
 +
!51
 +
|
 +
|Auto Kick-Down Switch input
 +
|-
 +
!15
 +
|GY
 +
|[[Instruments#Check_Light|Check engine light]] - to cluster
 +
!34
 +
|
 +
|
 +
!52
 +
|BR/BL
 +
|Closed throttle input - pin 1
 +
|-
 +
!16
 +
|BR/WT
 +
|[[Fuel#Injectors|Injectors]] 1,3,5
 +
!35
 +
|
 +
|
 +
!53
 +
|BR/BL
 +
|[[Intake#Throttle_Position_Switch|WOT input]] - pin 3
 +
Note: TPS pin 2 is ground
 +
|-
 +
!17
 +
|BR/YL
 +
|[[Fuel#Injectors|Injectors]] 2,4,6
 +
!36
 +
|BR
 +
|[[DME|Main relay]] output
 +
!54
 +
|
 +
|Automatic Transmission Torque Converter Lock-up Switch
 +
|-
 +
!18
 +
|RD
 +
|Constant 12V from [[Battery]]
 +
!37
 +
|RD/BU
 +
|Switched power from [[DME|main relay]]
 +
!55
 +
|WT/VI
 +
|TXD - [[Diagnostic_Plug|diagnostic plug]]
 +
|-
 +
!19
 +
|BR/OR
 +
|Main Ground
 +
!
 +
|
 +
|
 +
!
 +
|
 +
|
 +
|}

Revision as of 13:13, 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 ground 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

Motronic 1.3 uses the same engine loom as Motronic 1.1, and therefore the 55-pin plug remains the same. However, the small differences that crept into production during the lifetime of Motronic 1.3 mean that a few extra wires are in place, to control features such as ABS.

Pin Colour Function Pin Colour Function Pin Colour Function Image
1 BK Timing Control - to coil and O2 sensor 20 38 ABS and OBC cutoff for Injectors Motronic1 3Pins.jpg
2 BR Ground 21 39 GN/BU Programming voltage - Diagnostic Plug
3 BR/GN Fuel pump relay control 22 WT/GN Idle speed Close control 40 BK/GY A/C low pressure cutoff
4 WT/YL Idle speed control 23 BR/GR O2 sensor heater 41 VI/GY A/C On input
5 BR Evaporative purge valve 24 BR Ground 42 RD/BU Park/ neutral input (auto only)
6 BK Engine Speed output- to instrument cluster 25 43
7 GY/YL AFM input - pin 2 26 GY/BU AFM common- ground pin 4 44 GY/VI AFM air inlet temp- pin 1
8 BL Cylinder ID sensor input 27 GN Start input- to ignition switch and coil from OBC 45 BR/RD Coolant Temp input
9 28 BK O2 input 46
10 YL O2 sensor ground 29 BK/WT Vehicle Speed input from instrument cluster 47 BL Engine speed input
11 30 48 YL Engine speed input
12 GY/WT AFM reference output- pin 3 31 YL Cylinder ID sensor input 49
13 WT/YL RXO - diagnostic plug 32 WT/BL Fuel rate output- to instrument cluster 50 ABS Deceleration Fuel Cut-Off Overide
14 BR Injector Ground 33 51 Auto Kick-Down Switch input
15 GY Check engine light - to cluster 34 52 BR/BL Closed throttle input - pin 1
16 BR/WT Injectors 1,3,5 35 53 BR/BL WOT input - pin 3

Note: TPS pin 2 is ground

17 BR/YL Injectors 2,4,6 36 BR Main relay output 54 Automatic Transmission Torque Converter Lock-up Switch
18 RD Constant 12V from Battery 37 RD/BU Switched power from main relay 55 WT/VI TXD - diagnostic plug
19 BR/OR Main Ground
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