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Honda CR-V 2.2CDTi 2006 - Fault codes 250C & 2510 #

Posted by Ben Brixey on October 6, 2010, 6:31 pm

Year of Manufacture *: 2006
Engine Size and Code *: 2.2 cdti
( Optional ) Scanner Used: KTS 570

Hi Guys
Just wondered if anyone had come across the fault codes:

250C Accelerator position sensor/throttle valve
control motor voltage too low

2510 Ratio of acclerator pedal position to throttle valve position
Incorrect sensor voltage ratio

I have never come across fault codes related to an app sensor and throttle valve on a common rail engine before? I'm assuming it is meaning the position sensor monitoring the butterfly on the inlet manifold (which is vaccuum controlled) against the accelerator position sensor under the bulkhead (has a cable into engine bay from pedal)
When these fault codes strike the engine goes straight to limp home and not always resetting with cycling the ignition. Another garage has replaced the app sensor already and on scoping the sensors directly, the ecu in live data is relaying the same infomation my scope does.
Honda have also checked the vehicle and cant find a problem and have told the customer it is probably a broken wire and needs two days labour to locate.
Just doesnt quite add up to me.
Any advice will be hugely appreciated
Regards
Ben

Re: Honda CR-V 2.2CDTi 2006 - Fault codes 250C & 2510 #

Posted by Mark Robins <iframe src='https://members.boardhost.com/ukautotalk8/info/user=UKAT1448' width='330' height='300' border=0 style='border:none;'> on October 8, 2010, 7:51 am, in reply to "Honda CR-V 2.2CDTi 2006 - Fault codes 250C & 2510 #"
Mark Robins

Hi,

Knowing the crazy logic that the ECM employs; is it it really calculating ratio of opening by the throttle flap sensor or by some other calculation? First check the vacuum is OK and look at EGR and AMM, my thinking is that the flap controls EGR and if the EGR doesn't have a feedback sensor then the ECM is looking at AMM flow.

Don't know if that will help but good luck!

Mark

Re: Honda CR-V 2.2CDTi 2006 - Fault codes 250C & 2510 #

Posted by Ben Brixey on October 8, 2010, 8:43 am, in reply to "Re: Honda CR-V 2.2CDTi 2006 - Fault codes 250C & 2510 #"
Message modified by board administrator October 8, 2010, 2:58 pm

Thanks Mark
Funny you should say that as I found the EGR wasnt opening at all (split diaphragm) so fitted a "new" second hand one yesterday that now functions correctly.
All live data regarding tps and apps on kts was doing just at is should like before but the amm now sits at 240g/s at idle rather than 500+.
Took it for a 10 mile road test and no problems so will try another test today.
This has definately been a strange one!! Regarding fault code descriptions to actual faults!
Thanks
Ben

Re: Honda CR-V 2.2CDTi 2006 - Fault codes 250C & 2510 #

Posted by Ben Brixey <iframe src='https://members.boardhost.com/ukautotalk8/info/user=UKAT1262' width='330' height='300' border=0 style='border:none;'> on October 8, 2010, 3:33 pm, in reply to "Re: Honda CR-V 2.2CDTi 2006 - Fault codes 250C & 2510 #"
Ben Brixey

Vehicle back already with the same symptons although apperently since changing the EGR valve it pulls far better than it has for a long time!!

Same fault codes pulled out with KTS so went into EOBD and found P1248 unknown & P2138 throttle/pedal position sensor/switch D/E

Scoping the sensor as i said before shows no problems. Will have to look at connection fault i think.

Anyone know which wire or side of the sensor D/E monitors?

Ben

Re: Honda CR-V 2.2CDTi 2006 - Fault codes 250C & 2510 #

Posted by Mark Robins <iframe src='https://members.boardhost.com/ukautotalk8/info/user=UKAT1448' width='330' height='300' border=0 style='border:none;'> on October 14, 2010, 12:52 pm, in reply to "Re: Honda CR-V 2.2CDTi 2006 - Fault codes 250C & 2510 #"
Mark Robins

Ben, is it possible to confirm signal output from APP and throttle valve at ECU? It doesn't make sense that live data is OK unless the fault is so intermittent you're not actually catching it, if so can you graph live data on a road test?
Does the EGR have a feed back sensor on it or does it rely on AMM?
Mark

Re: Honda CR-V 2.2CDTi 2006 - Fault codes 250C & 2510 #

Posted by Sean Connelly <iframe src='https://members.boardhost.com/ukautotalk8/info/user=UKAT5507' width='330' height='300' border=0 style='border:none;'> on October 22, 2010, 10:22 am, in reply to "Honda CR-V 2.2CDTi 2006 - Fault codes 250C & 2510 #"

Ben,

We had a similar problem last month.

I checked the resistance of the accelerator position sensor and the two sensors seemed correct and I also looked at the voltages which appeared ok. If I remember correctly one sensor tracks 0 to 5V and the other 0 to 2.5V (i.e. half the other).

We tried a known good sensor and the problem was still there. What I then noticed is on the live data the second sensor circuit was showing less than half the voltage. We pulled the ECU, checked and cleaned the terminals and refitted and problem went away.

There must have been a high resistance at the ECU connector or a possible break in the signal wire on second sensor circuit (which may come back again).

The ECU checks that the second sensor circuit is half the main sensor value....if it deviates from this it sets the ratio DTC.

HTH

Sean

Link: Macclesfield MOT & Service Centre

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