P0705 - what happened?

[pribus]

Hi!

Yesterday I was happy for the new brake rotors, today not so happy. 

Went out for a pleasure ride. After about 3 minutes there is a slight "jerk" and the MIL and TC warning lights lights up. I stop and turn back home. I notice that the gear indicator is stuck on "1".

Back home I cycle the ignition and restart. The MIL is still lit, but the TC light is off. I found the excellent guide for fault codes, followed the procedure and found just one code, "P0705" which indicates "Gear position sensor malfunction".

Started the bike again. MIL still lit, TC not lit and gear position indicator working again. 


Now, a lot of questions:
What happened? Can a gear posision sensor fault cause the TC to light up? Do I have multiple faults?

I suppose I can't clear the code myself (without dealertool), to see if it returns?

Is the MIL still lit because there is a fault code stored?

Is it safe to ride to a workshop?

[Coconut]

If you refer back to my document - where you found the explanation for P0705
you will see that it also lists "3 / 40 / Y", which means that the MIL ( Malfunction Indicator Light )
will extinguish after "3" No Fault starts, and the DTC will be erased from Memory after "40" No Fault starts.

( The "Y" is an indication that this DTC does illuminate the MIL when the fault is logged ).

In the Service Manual, none of the Pinpoint Tests for checking this fault make any reference
to the Traction Control system / light, and are only concerned with checking wiring integrity etc,
however I would not be surprised at the Traction Control system becoming disabled if,
for example, the ECM "sees" 1st Gear being selected and the bike travelling at 70 MPH !

The wiring checks and tests for this Fault Code are :

Checking the integrity of connections at the Main ECM - Pins B23 and B44,
and for any Short circuit between those Pins,
Checking for Continuity - between ECM Pin B23 and Gear Position Sensor Pin 1,
"Ground" and Gear Position Sensor Pin 2,
and ECM Pin B44 to Gear Position Sensor Pin 3.

After rectifying any faults found with the wiring in the above tests,
if the Fault is still present or recurs, it is recommended to replace the Gear Position Sensor.

The Gear Position Sensor is fairly easy to access - located behind the left Control Plate
and adjacent to the Gear Change input shaft :



I haven't had the need to take mine out, to see whether the internal components
might be serviceable, or could be cleaned etc.

The Gear Position Sensor is Part Number T1290660 and costs around £65.00.

"Is it safe to ride to a workshop ?" - No-one can definitively answer that question,
but after carrying out any of the above checks that you are able to,
I would certainly recommend a Dealer looking at it to check.

Hope this helps.

[pribus]

Thank you Coconut!

Good advice there, to read ALL important info before panicking.

I guess the last question should have been "Does the lighted MIL mean some kind of forced limp-home mode or restriction?". It should probably restrict performance for some faults, but not trivial ones I guess.

[Coconut]

Page 25 of the Owners Handbook contains information about the
Engine Management System Malfunction Indicator Light ( MIL )
as shown below, followed by the usual "Warning" message.

Provided you take into account the reduced performance when riding,
you should be able to ride safely to a Dealer to have the fault rectified.

Cheers 

[Stoney]

Pribus, I once had the same symptoms you have.  While riding at highway speeds, I noticed both the MIL and TC lights would come on, then saw that the instrument panel indicated that I was in 1st gear at 65 mph.  This occurred about 3 times in just under a year, but there were no other related problems causing any issues while I was riding, other than the warning lights.  The cause ended up being oil invading the switch's electronics.  New switch, problem solved!

[pribus]

Thank you Stoney!

Yes, it sounds like the exact same symptoms. I will have the dealer look into it ASAP.

[pribus]

So, it went in to the dealer on limited warranty last week. The changed the sensor and cables (apparantly a newer version of hardware with more electrical connections than the early version mounted on my 2013).

No problems since then. 

I found another issue, though. There should be an icon for the heated grips on the display, but there isn't. The heating is working in both high and low settings, but there is no visual indication on the display (the instruction manual say it should). Is this common, or do I have gremlins in the electronics?

[Coconut]

Some Trophies have a “Shorting Plug” on part of the wiring Loom
underneath the Glove Box, where the plug - provided with the Heated Grips kit
is inserted to the socket to enable the Instrument Panel Icons.

Other Trophies without that plug, and I believe even some that do,
need to be enabled in the Dealer Setup menu.

The After Market DealerTool device can also accomplish this task. 

Cheers,