ECU to gauge connections

[suzyj]

Hi guys,

Just wondering what the Body 9 and body 13 pins on the ECU do.  They're connected to pins 18 and 8 of the gauges, but otherwise go nowhere else...

Cheers,

Suzy

[J5]

the wiring diagram for my s4 says

Body9 tach out
Body13 warn lamp

maybe thats the ecu fault light ?

i remember seeing in the past when researching gauge clusters that someone changed their gauges and they had a pinout diagram of the gauge connector

there will prob be some more info on the subject if you have a search around

[suzyj]

Thanks for that.  It confirms my suspicions that there's nothing magical about the comms between the ECU and gauges - all you need to do is give the gauges a tach signal, and they're happy.  I guess the CEL light drive is optional.

Here's what I have so far, from scouring the wiring diagrams of the 695, S2R 800, S2R 1000, 999, & 998.

Although each connector has 38 pins, only 20 from each are actually used (at least on those ducs that I checked).  This is cool, because it means that the ultra-weird connectors used for the ECU can be replaced with much more manageable ones.  My preference at the moment is 2 x 23 pin Ampseal connectors.

Alas there's more to be driven and sensed than pins available on a standard microsquirt.

The wiring colous are from the 695 diagram - I didn't check whether the wiring colours for other models are the same.

Code Select Expand


Body Colour Function

1 R/Bk Solenoid drive - active low.

4 R/B +12V from fuse 4 - 5A ECU power.

6 Bn/Bk Injector relay coil - active low.

7 O/B Keylock - to pin 15 of gauges.

8 Gr/Bk Headlight relay coil - active low.

9 G Tach out - to pin 18 of gauges

11 Bk/B O2 sensor - pin 4 - heat

13 B/Y Warning lamp out - to pin 8 of gauges

14 G/Bk Fan drive - fan on when grounded (999 only)

16 O/W Diagnostic connector pin 3

17 R/G Keysense - Switched +12V - on when keyswitch is in on position

20 R/W MPXCAN+ (999 only)

22 Lb O2 sensor pin 1

24 Gr/G Hall speed sensor pin 2, Gauges pin 17

27 W/B Engine stop switch - +12V when ign is on and stop switch is on.

28 R/O Starter button - pulled to ground when button pressed

29 R/Bk MPXCAN- (999)

32 G/B O2 sensor pin 2

33 B/W Clutch switch - pulls to ground

38 W/R Side stand switch pin 2 - pulls to ground



Engine Colour Function

3 O TPS pot pin C - drive

5 W Oil temp sensor pin 1

9 W Idle stepper C

10 Gr/G Vertical coil drive

13 Gr/Bk Air temp/pres sensor pin 4

14 Gr/R Air temp/pres sensor pin 2

17 LB Idle stepper A

18 Gr Idle stepper D

19 V Idle stepper B

20 Bk/G TPS pot pin A - sensor ground

22 Bn/R Air temp/pres sensor pin 3 - sensor supply

23 Y/G Neutral switch - pulls to ground

25 sc.1B Crank sensor

28 P/Y Horizontal injector - active low

29 Bk/V Sensor Ground - output from ECU

32 Bn/G TPS pot pin B - wiper

34 field Crank sensor shield

35 sc.1A Crank sensor

37 G/Y Vertical injector - active low

38 Gr/B Horizontal coil drive


[caperix]

Is microsquirt fuel only or does it do fuel  ignition like the MS2 board?  Im guessing your looking to run the bike on a microsquirt ECU?  I would not worry to much about the pin outs of the factory ECU compaired to what the MS board has available as they use different methods for determining fuel demand.  I think there was someone who ran a 907ie on megasquirt on the msruns board awhile back.  Other than the crank sensor setup & the maps everything else should be the same for the install.