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[TheBoy]

Saw TD's 2.2 with LPG earlier today.

Quite a strange little problem, thats got my brain cells thinking.

To clarify, symptoms are:

Both engine and gearbox go into limp if engine warm, and turned on after 15mins of being switched off.
If in limp, switching off and restarting will cause it to run normally.

Engine DTCs are Cam sensor fault and a SVS CAN request

Gearbox DTCs are a pair of CAN receive errors


Engine ECU and g/box ECU are running latest software as of Oct 2005.  No option to update ABS ECU.

My suggestion is, contact LPG installer, to see if they have picked up a signal off cam sensor, and if so, can they disconnect to test.

Then replace the cam sensor.


Thoughts?

[Auto Addict]

Seem's like exactly the same fault as mine had, except no LPG.

[TheBoy]

Seem's like exactly the same fault as mine had, except no LPG.

AA - did your gearbox go into limp as well?

[CaptainZok]

Could it be a component thats getting hot from the heat under the bonnet when the engines stopped causing the fault? Starting engine dissipates heat thus switch off and restart clears fault.
But what do I know.

[Auto Addict]

Seem's like exactly the same fault as mine had, except no LPG.

AA - did your gearbox go into limp as well?

Yes.

[TheBoy]

AA - thats good to know, coz it does seem to be cam sensor, but couldn't work out why knocking g/box into limp as well.


I have spoken to Marks_DTM and he has theories as to why g/box is flagging codes.

[Auto Addict]

Crank sensor? Or do you mean cam sensor?

By the way, it didn't go into limp mode all the time, but it did happen more frequently as time went on (nearly 2 years), before the cam sensor was changed.

[TheBoy]

Crank sensor? Or do you mean cam sensor?

yes CAM sensor, modified my post now...

[Taxi_Driver]

Thanks again Jaime for spending the afternoon looking at it  

I'll check with lpg installer tomorrow if they have taken a feed off the cam sensor wiring.

If they havent i'll get the cam sensor changed and then go from there.

Cheers  

[TheBoy]

Thanks again Jaime for spending the afternoon looking at it  

I'll check with lpg installer tomorrow if they have taken a feed off the cam sensor wiring.

If they havent i'll get the cam sensor changed and then go from there.

Cheers  

I spoke to Marks_DTM about it, and he thinks unlikely they have taken feed from cam sensor, as it would be 2 pulses per rpm. But worth checking with then, just in case.

Then change cam sensor. Marks_DTM reckons a '10 minute job'

[Taxi_Driver]

Thanks again Jaime for spending the afternoon looking at it  

I'll check with lpg installer tomorrow if they have taken a feed off the cam sensor wiring.

If they havent i'll get the cam sensor changed and then go from there.

Cheers  

I spoke to Marks_DTM about it, and he thinks unlikely they have taken feed from cam sensor, as it would be 2 pulses per rpm. But worth checking with then, just in case.

Then change cam sensor. Marks_DTM reckons a '10 minute job'

LOL '10 minute job' , well maybe for Mark, not for me.....i think your Haynes said about removing aux belt and cambelt cover.....it only takes me 10 minutes to decide its a garage job! lol....somethings i i can do.....like disconnect the crank sensor to show you a 2.2 will start with it disconnected  

[TheBoy]

Yeah, I agree, it definately starts (albeit sluggishly) without a crank sensor. Actually, it starts as well as when its complaining about cam sensor....   ...maybe on FBWs, one sensor can help replace the other (failed crank sensor on non FBWs is a tow home job)

[Marks DTM Calib]

My theory is that when going into the limp home routine the CAN bus protocols get ignored and hence the gearbox thinks the engine ECU is ignoring it so flags a fault and drops into limp home mode (it would not be able to retard the timing on changes if the CAN bus link was down and hence it protects it self).

Cam sensor only gives 0.5 x RPM signal so would be of little use to the LPG install.

The disapointing thing is that I though the dealer had said that they had changed the cam sensor.....

[Taxi_Driver]

My theory is that when going into the limp home routine the CAN bus protocols get ignored and hence the gearbox thinks the engine ECU is ignoring it so flags a fault and drops into limp home mode (it would not be able to retard the timing on changes if the CAN bus link was down and hence it protects it self).

Cam sensor only gives 0.5 x RPM signal so would be of little use to the LPG install.

The disapointing thing is that I though the dealer had said that they had changed the cam sensor.....

Sounds good to me (but then i believe anything   )  

Dealer did tell me they changed the cam sensor......but when Jaime had a look at the cam sensor connectors he said they looked as tho the connector had been off and a few times (quite a few marks on the pins)  Plus imo the plastic on the connector didnt look as new as the crank one that i had changed a couple of weeks ago.

[Taxi_Driver]

Saw 2 of the guys that work at the lpg install place i had the omega converted at....and no they dont touch any of the wiring for the cam sensor......so i'll get the cam sensor changed.

Hope it does fix it, as im quite looking forward to visiting the vx dealer and calling the service manager a lying b*stard   Hopefully with a showroom of customers!