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Twin Thumper, IYKWIM
 
Join Date: Mar 2016
Location: San Francisco, CA
Posts: 43
Garage
Home brew diagnostic reader: Motronic and ABS

Funny thing happens when you’re mid-project and have a bunch of time on your hands. I did all the research, figured out how to read the trouble codes from the ABS unit, and the same for the ECU, via blinking LED. In general, it’s kind of a pain in the butt.

But if you’re gonna have the Tupperware and gas tank off for some other purpose, and you’re a shadetree mechanic who doesn’t want to/can’t spare the dough for a GS-911 tool, you might as well run your own diagnostic wires for ABS and Motronic. It’s certainly nice to have, when it’s needed.

Pin 20* in the ABS plug: the diagnostic “blink” circuit (brown/blue wire)
Pin 21* in the ABS plug: the “reset” terminal (vacant from the factory)
Pin 18 in the Motronic plug: the diagnostic “blink” circuit (vacant from the factory)

Optional, if you’d rather not use a Powerlet dongle for power and ground:
Pin 15* in the ABS plug: switched 12v+
Pin 1* in the ABS plug: ground
* for bikes with ABS-2 with the 25-pin connector

You’ll need some standard female spade terminals that’ll fit the ABS/Motronic connectors. I raided the local junkyard, pulled the headlight switch from a B5 Passat, and got about a dozen of them for a few bucks. The rest of the components are less than $20 at Fry’s. I already had wire crimpers and de-pinning tools, but those are also cheap on Amazon.

When the switch is flipped to ABS, trouble codes begin to blink as soon as the ignition is on. To reset the ABS system (once you’ve resolved the issue, obviously), flip the “Reset” switch on the side to ON, then turn on the ignition, then press the button for 8 seconds; both ABS lights on your dash will illuminate solid (success) when you release the button. When it’s flipped to Motronic, press the button for 5 seconds to begin the first code, and then again to prompt for every subsequent code, until it finally returns 0000 — no more faults.

All credit goes to the fine folks who collected the relevant information on advrider.com, and to Anton Largiader. Lemme know if you see any problems with my wiring diagram, as this is kind of a new thing for me.

ECU trouble code reference:
1111 — CO Potentiometer
1133 — Hall signal 2
1122 — Hall Signal 1
1215 — Throttle Butterfly Angle Sensor
1223 — Engine Temperature Sensor
1224 — Air Temperature Sensor
2341 — O2 Sensor At Limit
2342 — O2 Sensor signal invalid
2343 — Mixture setting at limit
2344 — O2 sensor shorted to ground
2345 — O2 sensor shorted to 12V
0000 — No further fault stored
4444 — No Fault Stored

ABS trouble code reference:
1. front pressure modulator
2. rear pressure modulator
3. front wheel speed sensor
4. rear wheel speed sensor
5. battery voltage too low
6. ABS relay
7. ABS control unit
8. sensor gap front or rear, or other outside influence
9. «unknown, but seems to exist»
16. Failed plunger test, persistent



Last edited by punkassjim; 05-21-2018 at 10:42 AM..
Old 05-12-2018, 12:37 AM
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Registered User
 
Join Date: Oct 2010
Location: Central NJ
Posts: 320
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Would it be safe to say, that if you just wanted to read the ECU ( Motronic's) by itself, you can just tap into the ECU ,without needing to tap into the ABS ,and get a reading ?

And also vice versa ?
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2004 R1100S
Old 05-12-2018, 08:04 AM
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Twin Thumper, IYKWIM
 
Join Date: Mar 2016
Location: San Francisco, CA
Posts: 43
Garage
Quote:
Originally Posted by Groceryrun View Post
Would it be safe to say, that if you just wanted to read the ECU ( Motronic's) by itself, you can just tap into the ECU ,without needing to tap into the ABS ,and get a reading ?

And also vice versa ?
Yep. I provided links to each procedure above. GS Addict even provided his wiring diagram for his Motronic shop tester.

But, if your bike has ABS, and you’re gonna go to the trouble of running one wire, why not run three while you’re in there? Hell, you could run all five (including switched 12v+ and ground), and not bother with the separate Powerlet connector, making your diagnostic box even more pocketable.

Last edited by punkassjim; 05-21-2018 at 10:40 AM..
Old 05-12-2018, 10:46 AM
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