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ECU Pinout and Electrical tests E30

October 27, 2012
By

Where and how to access ECU: I have tried to illustrate where and how to access the ECU, it is in the glove box compartment. To access it open your glove box and undo the two screws holding the plastic cover that is at the “ceiling” of the glove box compartment, under there you will find the ECU and the Connector.

Interesting fact: The 153 Motronic 1.1 ECU is directly swappable (without any modification or otherwise) with all motronic 1.3 ECU’s. The Grey label 173 is the most popular of the 1.3 ecu’s, mainly because of its availability. Generally speaking there is no advantages to running one 1.3 ECU over another. The differences between the 1.1 and 1.3 apart from software updates is that the 1.3 uses only 1 board within the ECU whereas the 1.1 uses two boards. Having less boards means less failure points. Some people have claimed to have better idle with the 1.3 ECU’s although I haven’t noticed such improvements. As I have covered in another article the main benefit to the 1.3 ECU’s is that they are able to store engine fault codes and you do not need a scanner to access them, all you need to do is preform a stomp test. Click “this” to access the stomp test page.


The Motronic 1.0 ECU (325, 325e)

Pin Function Pin Function Image
1 Ignition coil output 19 Ground
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 (325i, 325is, 325ix) Green label 153 ECU.

Pin Function Pin Function Pin Function Image
1 Timing Control – to coil and O2 sensor 20 38
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 Econometer 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 3Note: 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 (325i, 325is, 325ix) later model 173 grey label ECU and others (351, 380, 382, 524, 525, 526)

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
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 Tachometer 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 frominstrument 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 Econometer 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 3Note: 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 fromBattery 37 RD/BU Switched power from main relay 55 WT/VI TXD – diagnostic plug
19 BR/OR Main Ground

 

ECU electrical tests (at the connector)

35 pin (325, 325e)

 

55pin (325i, 325is, 325ix)

List of 6 cylinder E30 ECU’s

325i/is/iX
E30
M20/B25 (170hp)
87-91
0 261 200 153
Bosch Motronic M1.1

325i/is/iX
E30
M20/B25 (170hp)
87-91
0 261 200 173
Bosch Motronic M1.3

325i/is/iX
E30
M20/B25 (170hp)
87-91
0 261 200 351
Bosch Motronic M1.3

325i/is/iX
E30
M20/B25 (170hp)
87-91
0 261 200 380
Bosch Motronic M1.3

325i/is/iX
E30
M20/B25 (170hp)
87-91
0 261 200 382
Bosch Motronic M1.3

325i/is/iX
E30
M20/B25 (170hp)
87-91
0 261 200 524
Bosch Motronic M1.3

325i/is/iX
E30
M20/B25 (170hp)
87-91
0 261 200 525
Bosch Motronic M1.3

325i/is/iX
E30
M20/B25 (170hp)
87-91
0 261 200 526
Bosch Motronic M1.3

325e/es
E30
M20/B27 (122hp)
9/84-12/86
0 261 200 027
Bosch Motronic Basic M1.0

325e/es
E30
M20/B27 (127hp)
1/87-9/87
0 261 200 154
Bosch Motronic M1.1


7 Responses to ECU Pinout and Electrical tests E30

  1. […] the connector) component circuit—–test terminals——test conditions——-correct test value ECU Pinout and Electrical tests E30 | RTS – Your Total BMW Enthusiast SHOGUN'S TRICKS AND TIPS FOR THE SEVEN SERIES Reply With […]

  2. Elektrik ECU Pin Identifizierung + Techn. Daten on April 27, 2013 at 11:58 pm

    […] fuer die M3.3 beim E32 M60 hab ich noch nichts gefunden, aber M3.3 fuer den S50B30 mit Vanos  EndTuning – BMW Pinouts sollte helfen auch fuer den M60 Bosch Motronic M1.1 und 1.3  ECU Pinout and Electrical tests E30 | RTS – Your Total BMW Enthusiast […]

  3. afl on August 8, 2013 at 9:25 am

    Hi, I have a #173 ECU and I think the last owner may have modified the chip. Is there a way that I can bench test my ECU to find out the chip modifications.

    Thanks
    F

  4. admin on November 10, 2013 at 9:33 pm

    The best way to check is to open the casing and look at the chip itself, it will be labeled as an aftermarket chip by the maker.

  5. Motorelektronik klemmen M30 on January 22, 2014 at 3:15 am

    […] hat (siehe mein Kommentar im E34 Forum). Aber hier noch mal das Pinout the M1.1 und M1.3  ECU Pinout and Electrical tests E30 | RTS – Your Total BMW Enthusiast __________________ Gruss/Erich  7er Reparaturhilfen  Unser Hilfsprojekt […]

  6. normmoore1 on December 21, 2014 at 5:23 am

    please could you supply me pin out for connector for e34 525 m50 motor19 92 that I have fitted to a e34 525 1989 m20 motor which had single cam motor in I have both cars complete would really appreciate your help let me know how much

  7. hector 320i on April 14, 2017 at 3:41 pm

    Hola, me presento soy hector y tengo un e30 1987 316, y le hice un swap de motor de m10 a m20b20 1989, y la ecu es una bosch motronic 1.3 0 261 200 172
    la pregunta es: puedo ver los códigos de la misma manera?

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