My 2015 scrambler icon just had a new rear speed/abs sensor due to ABS error and speed showing zero. After installing the new sensor, its still showing an error, although onstead of Zero, it shows --- on the dash, still having ABS ERROR. Plugged into doagnostics, came up woth DTC P1637-60 and no other codes, but no explanation! Anybody knows what that is??
An internet search comes up with various possibilities; Understanding Check Engine Light Codes This information should work for any vehicle built from 1996 to today (there will be exceptions though). Example P0340 (Camshaft sensor code) 1st Digit: B is for Body, C is for Chassis, P is for Powertrain, U is for Network 2nd Digit: 0 is for SAE aka generic, 1 is for mfg (Manufacturer Specific Codes) 3rd Digit= * 1 Fuel and Air Metering * 2 Fuel and Air Metering Injector Circuit * 3 Ignition System (Including Misfires) * 4 Auxiliary Emissions Controls * 5 Vehicle Speed Controls And Idle Control System * 6 Computer Output Circuit * 7 Transmission * 8 TransmissionSo; P = Power train, i.e engine 1 = Manufacturer specific 6 = Computer output circuit I haven't found anything definite beyond that, but of the various possibilities this turns up frequently. P1637 Can Link ECM/ABSCM Circuit / Network Malfunction It would suggest that there may be a CAN line communication problem between the ABS electronic module and the ECU.
Thanks for that Would a specific Ducati diagnostic tool shed some more light on that? I went over and cleaned connections numerous times to no avail
I'm sure that a Ducati diagnostic tool would help but unfortunately you're going to have to go to a dealer for that.
yip, its a communication issue. what all needs info from the speed sensor? do bikes have a Body computer/BSI? is its possibly in the dash?, what else?, pump, engine ECU. at that age its unlikely going to be a damaged/chaffed wire but never say never. more likely a connection issue. disconnect your battery. remove the connectors from each unit look inside and check for any signs of contamination. rusty or greenish looking pins on Each ECU and its connector. spray with contact cleaner and retry.
There is no BBS on the Scrambler. Both speed sensors connect to the ABS control module which is connected to the ECU and the dash by CAN Hi (grey/black wire) and CAN Lo (grey/green wire). There is nothing else in between. So the connectors to look at would be those to the sensor, the ABS module, the ECU and the dash. The ECU connector is easily accessed below the seat. The ABS unit is also below the seat and should accessible once the battery and USB socket panel have been removed. The dash connector is underneath the instrument which may need to be removed for access.
Thanks! I couldnt get to the abs connection, but i will. With regards to the dash, does it connect just under the back cover? Would the connection to the dash produce such faults? I thought it just screens ECU info
Yes, the connector is under the back cover. If the dash doesn't get the both CAN line connections it wont register the speed but it most probably wouldn't register the air temperature either since that info is also supplied via the CANbus. If it's a connection problem it's most likely to be at the ABS module.
Simple physical layer check on abs /engine can .... Find the ‘twisted pair ‘wires .... with ignition on ,dip into can high you should have around 2.8 volts , dip can low wire you should have around 2.5 volts ..... if this is good network not being pulled down or cross fed in any way and next test would be on scope to look at batch data packets , without a scope obviously you cannot do this . Question.... the rear abs sensor ... is it digital or ac generator ... is it 2 or 3 wire . You need to do checks at the plug to the abs sensor ...live , earth and ecm bias signal checks
Good tips there. More info on what to look for in data packets would be useful. The speed sensors are 2 wire and I believe they are hall-effect not variable reluctance.
maybe eaiser using a basic multimeter set to ohms of the CAN system. with the battery disconected. i think i have got this the right way round, its been a while. they have a resistance of 70?ohms if all connections are good. if one goes down its 140 ohms. leave all conections on all ECU.s find the twisted wires. probe carefully there.
