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Post Info TOPIC: A/B Map feature


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A/B Map feature


One thing we've found is that the ECU has two complete sets of maps that are jumper selectable. Today I verified the A/B map feature works.

I flashed a zero map into the cylinder 1, A fuel map of a 21175-1065 ECU. This is a UK A1 model. I hooked it up to my bike emulator that allows me to bench run the ECUs. Without the jumper the ECU ran normally. I turned off the 'key' shorted the jumper to ground, turned on the 'bike' and ran it again. This time cylinder 1 injector ran dark (the emulator uses 12v bulbs instead of injectors)

The jumper wire is connected to ECU pin 64 on A1 models and pin 34 on A2/B1/B2 models. On both types the pin is connected to the white wire with black stripe of the 8 pin diagnostic connector located in the bikes tail under the seat. This same connector also has a ground wire, Brown w/ Black stripe, that you could use to jump to.

Actually the shop manual shows that these wires are shorted on some non-US models. If you could order the part with the jumper wire you would be able to wire in a switch with out hacking up your wire harness. So far every ECU I've looked at the A maps and B maps have exactly the same data. However every ECU I've looked at also is in the manual as not needing a jumper.

White w/ Black stripe wire open selects B Maps (normal operation)
White w/ Black stripe wire grounded selects A Maps

The Maps select jumper setting is only read when key is first turned on. Maps can NOT be switched on the fly while the bike is running.

While I have only physically verified this on an A1 model ECU I have seen the exact same, line for line, map select routine in each version of software. And am assuming it works on all versions.

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