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post #11 of 19 (permalink) Old 12-22-2018, 10:27 AM Thread Starter
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So got me a code reader and I have code P1108. Haynes manual says Ambient air pressure sensor circuit high voltage.
Now in English please someone?

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post #12 of 19 (permalink) Old 12-22-2018, 01:08 PM
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Find the barometric pressure sensor, it's under the seat like this, top right of photo:





Inspect the wiring for breaks or damage, plug and unplug from its connector a couple of times in case the contacts are dirty or corroded and unbolt from the frame to check that the air pressure sensing pipe stub is not blocked by either a spider's nest or other debris, including a bent bracket or rear fender mods that bring the open end of the stub too close to them:





If something like that is what is causing the fault code, remove cause and use the OBD code reader to cancel the MIL light.
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Last edited by Forchetto; 12-22-2018 at 01:13 PM.
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post #13 of 19 (permalink) Old 12-22-2018, 04:00 PM Thread Starter
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Just seen how much they are to replace - ****! 😳

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post #14 of 19 (permalink) Old 12-22-2018, 09:48 PM
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Originally Posted by Beardychops View Post
Just seen how much they are to replace - ****! 😳

How do you test this type of component?. no real idea, but thinking laterally, if you blow or suck on the hose stub port something must change as you're varying the pressure the component senses.

The sensor is fed with +5 volts from the ECM that go into terminal 3 (pink wire). Terminal 2 (Pink/black wire) is connected to ground or negative. The remaining terminal 1 (Pink/purple) is the output signal to the ECM.

At sea level, where I live, 4 volts are seen there. If you monitor this voltage and blow down the port with your mouth, that voltage rises to 4.5 volts. Stop blowing and it returns to 4.0 volts. Now suck on it with all your might and the voltage at terminal 1 drops to around 3.45 volts.

I realise this is not very scientific or factory approved procedure, but it's as good as any to ascertain if this component is working. Don't go looking in the factory manual for help either. There's none worth reading.


As the connections are impossible to reach to be able to do the voltage measurements outlined above, the thing to do is to either use some of those multimeter probes that end in a needle-sharp point which is intended to pierce the cables or stick some pins into the insulation until they touch the copper wire and attach the meter probes to the pins with croc clips.


Attach a length of hose to the stub and place the end in your mouth to provide the blow and suck part of the test (ensure there are no spider's nest inside the component, we've had those blocking the stub before ).


The multimeter negative probe is connected to a good ground or directly to the pink/black wire, the positive probe to the pink/purple. Note the voltage and blow or suck on the hose and observe if the meter display. changes
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Last edited by Forchetto; 12-22-2018 at 09:52 PM.
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post #15 of 19 (permalink) Old 12-22-2018, 10:13 PM
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if you have the Tune program and an OBD cable you can see what the sensor is reading. used it the other day when I had a problem to check the pressure and temp sensors were working. They were in my case.
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post #16 of 19 (permalink) Old 12-23-2018, 03:40 AM Thread Starter
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Think I’m going to have to replace the laptop in the new year and get tune ecu - be nice to see what the bikes doing without just guessing!
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post #17 of 19 (permalink) Old 12-23-2018, 05:12 AM
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Think I’m going to have to replace the laptop in the new year and get tune ecu - be nice to see what the bikes doing without just guessing!
If the code reader that you've bought is one of those low-cost Bluetooth plug-in units, then you can download TuneEcu for android phones for 10 or so. That would enable you to see the sensor working as @plodalong suggests.

The reading you'll see on the screen should be exactly the same as the current weather reports, so many mbs. For example where you are in Surrey it should read 1015mb at the moment rising to 1018 towards the end of the day (and you'll get some rain). The sensor is really acting like a mini weather station!.

http://www.tuneecu.com/TuneECU_En/android.html

Air pressure readings to be expected from sites like these:

https://www.netweather.tv/weather-fo...nham,%20Surrey

Have you done the basic checks as suggested in my posts 14 and 17? there's no feedback or acknowledgement of the posts. To me this means I'm wasting my time and at my age I'm close to my dead-by-date and can't afford to hang around here for nothing...
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Last edited by Forchetto; 12-23-2018 at 05:38 AM.
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post #18 of 19 (permalink) Old 12-23-2018, 12:34 PM Thread Starter
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Time never wasted on here!
I’ve tried clearing out said part - no apparent spider nests or any other bug life. OBD was a plug in part not a blue tooth option, so until new year when the new lap top arrives the more technical stuff will have to wait. I do have a multimeter in the workshop, so could test resistance if I can figure out what to do?
But for now the Christmas ales have been unleashed, and it’s pi**ing with rain, so Merry Christmas one and all, technical duties will resume soon.
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post #19 of 19 (permalink) Old 01-04-2019, 12:41 PM Thread Starter
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Code deleted, ran engine 5mins no code. Road test to come...

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