Omega Owners Forum
Omega Help Area => Omega General Help => Topic started by: SIR Philbutt on 07 June 2015, 22:01:23
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Apologies for this being a bit long but looking for suggestions that I have not already done
As above - have been getting this error when spanner light comes on, although light not on permanently, it resets with ignition off/restart.
P1555 Throttle Position Sensor (TPS) Load Signal not Plausible with Engine Load
Happens when cold and hot, town and motorway, petrol and LPG.
The only occasion I can make it happen consistently is when parked up and holding the revs between 1500 - 2500, occurs almost instantly.
The car drives normally, at all times.
Revs do not fluctuate when idling.
Fuel consumption seems usual
When started cold the revs are 1100ish and come down to 800ish after a couple of minutes
Have researched on here and t'internet and consensus is clean throttle body & unblock hole and breather pipes - did this, no fix
Other suggestions include,
replace throttle body & gasket - done that
replace cam sensor - done that
replace lamba's - done that
have also,
replaced MAF and air filter.
EGR blanked and un-blanked
I am getting desperate and trying anything
Some history, in done order, to fix numerous other problems
New Silencer - padding blown out
New CAT flexi - blowing
New CAT back boxes - rusted
New EGR gasket - leaking
New exhaust manifold - cracked
Cannot recall when code first appeared but was definitely there when I was investigating the EGR gasket problem
Did suspect throttle, but discounted it when discovered the error occurred when using cruise control
Also have considered ECU, but assumed I would be getting other problems as well
Completely stuck now can anyone suggest where to look now ???????
TIA
Phil
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forgot to mention
The EML (engine light) has been on once, for a couple of days, and the spanner light did not come on during this time ???????
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Did you change tps when you changed throttle body?
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Did you change tps when you changed throttle body?
It's part of the TB :y
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Did you change tps when you changed throttle body?
It's part of the TB :y
Another TPS above accelerator pedal ;)
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Did you change tps when you changed throttle body?
It's part of the TB :y
Another TPS above accelerator pedal ;)
Does it happening when using cruise only exclude the accelerator (stop, reset, set off, engage cruise, short dist - error, repeat, error again)
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Does it happening when using cruise only exclude the accelerator
Nope. When using cruise, accelerator is still "in play"
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Does it happening when using cruise only exclude the accelerator
Nope. When using cruise, accelerator is still "in play"
how? The 2.2 is fly by wire :-\
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how? The 2.2 is fly by wire
Still uses the pedal to accelerate (hence 2nd TPS at top of pedal), doesn`t go faster by magic Andy :P :)
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Without live data, we're pissing in the wind. And the random part swapping may cloud it futher.
But I'd be looking for air leaks, or comparing MAF values with known good
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how? The 2.2 is fly by wire
Still uses the pedal to accelerate (hence 2nd TPS at top of pedal), doesn`t go faster by magic Andy :P :)
I'd have thought that the magical engine ECU would accelerate without the pedal ..... :-\
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how? The 2.2 is fly by wire
Still uses the pedal to accelerate (hence 2nd TPS at top of pedal), doesn`t go faster by magic Andy :P :)
I'd have thought that the magical engine ECU would accelerate without the pedal ..... :-\
As long as it gets a signal from TPS which is attached to the pedal via a double-ended balljoint linkage. The TPS when receiving said signal actuates the throttle pedal
(http://shop.euroimpex.lt/product_images/00007813_1901448406.jpg?big=1)
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Sounds about right when you think about it, otherwise the pedal would return to 'zero' when you selected cruise & you removed your foot from the throttle. :y
Funny that you should have a picture ::) ;)
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Sounds about right when you think about it, otherwise the pedal would return to 'zero' when you selected cruise & you removed your foot from the throttle. :y
Funny that you should have a picture ::) ;)
What a surprise :P ;D ;D
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how? The 2.2 is fly by wire
Still uses the pedal to accelerate (hence 2nd TPS at top of pedal), doesn`t go faster by magic Andy :P :)
I'd have thought that the magical engine ECU would accelerate without the pedal ..... :-\
As long as it gets a signal from TPS which is attached to the pedal via a double-ended balljoint linkage. The TPS when receiving said signal actuates the throttle pedal
So first suggestion is the throttle pedal - I did suspect this but made the wrong assumption about cruise - thanks Rob/Andy
Without live data, we're pissing in the wind. And the random part swapping may cloud it futher.
But I'd be looking for air leaks, or comparing MAF values with known good
Not exactly "random" TB, just a progression of the most suggested solutions, gleamed from here, to the more obscure as not getting any resolution.
Been all over it, like a car bonnet, looking for leaks, originally when I had the EGR gasket leak and again with this. Not found any. Wouldn't a leak be causing some other "symptoms"? If you can suggest a leak source that can cause just a P1555 error and nothing else then I would gladly test it, got used to the different flavours you get when sucking and blowing an Omega. Cue STMO ::)
Difficult to use a known good MAF, no one seems to have a spare. I have purchased a GM one to at least have some confidence in it's operation and it made no difference. So either they both have the same fault or the fault is somewhere else.
Is there somewhere on here a set of known good live data that i could compare with, if Mr Beanz is finished with his Autel and kindly lets me borrow it again.
Oh and used to P1555ing in the wind for weeks now ;) ;D
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Oh and used to P1555ing in the wind for weeks now ;) ;D
Now that did make me chuckle :y
I've been through the TIS procedure for this code, and its wishy washy, and points to a few things, including ECU. Typical dealer type repair then ;D
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.... if Mr Beanz is finished with his Autel and kindly lets me borrow it again.
...
No problem :y
The Shitroen showed no faults! ??? ???
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how? The 2.2 is fly by wire
Still uses the pedal to accelerate (hence 2nd TPS at top of pedal), doesn`t go faster by magic Andy :P :)
I'd have thought that the magical engine ECU would accelerate without the pedal ..... :-\
As long as it gets a signal from TPS which is attached to the pedal via a double-ended balljoint linkage. The TPS when receiving said signal actuates the throttle pedal
So first suggestion is the throttle pedal - I did suspect this but made the wrong assumption about cruise - thanks Rob/Andy
Without live data, we're pissing in the wind. And the random part swapping may cloud it futher.
But I'd be looking for air leaks, or comparing MAF values with known good
Not exactly "random" TB, just a progression of the most suggested solutions, gleamed from here, to the more obscure as not getting any resolution.
Been all over it, like a car bonnet, looking for leaks, originally when I had the EGR gasket leak and again with this. Not found any. Wouldn't a leak be causing some other "symptoms"? If you can suggest a leak source that can cause just a P1555 error and nothing else then I would gladly test it, got used to the different flavours you get when sucking and blowing an Omega. Cue STMO ::)
Difficult to use a known good MAF, no one seems to have a spare. I have purchased a GM one to at least have some confidence in it's operation and it made no difference. So either they both have the same fault or the fault is somewhere else.
Is there somewhere on here a set of known good live data that i could compare with, if Mr Beanz is finished with his Autel and kindly lets me borrow it again.
Oh and used to P1555ing in the wind for weeks now ;) ;D
Yes :y Hot engine..30 secs on tickover
https://dl.dropboxusercontent.com/u/70807181/Livedata_2002%20%282%29_Omega-B_Engine__Z%2022%20XE_201411171302.csv
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how? The 2.2 is fly by wire
Still uses the pedal to accelerate (hence 2nd TPS at top of pedal), doesn`t go faster by magic Andy :P :)
I'd have thought that the magical engine ECU would accelerate without the pedal ..... :-\
As long as it gets a signal from TPS which is attached to the pedal via a double-ended balljoint linkage. The TPS when receiving said signal actuates the throttle pedal
So first suggestion is the throttle pedal - I did suspect this but made the wrong assumption about cruise - thanks Rob/Andy
Without live data, we're pissing in the wind. And the random part swapping may cloud it futher.
But I'd be looking for air leaks, or comparing MAF values with known good
Not exactly "random" TB, just a progression of the most suggested solutions, gleamed from here, to the more obscure as not getting any resolution.
Been all over it, like a car bonnet, looking for leaks, originally when I had the EGR gasket leak and again with this. Not found any. Wouldn't a leak be causing some other "symptoms"? If you can suggest a leak source that can cause just a P1555 error and nothing else then I would gladly test it, got used to the different flavours you get when sucking and blowing an Omega. Cue STMO ::)
Difficult to use a known good MAF, no one seems to have a spare. I have purchased a GM one to at least have some confidence in it's operation and it made no difference. So either they both have the same fault or the fault is somewhere else.
Is there somewhere on here a set of known good live data that i could compare with, if Mr Beanz is finished with his Autel and kindly lets me borrow it again.
Oh and used to P1555ing in the wind for weeks now ;) ;D
Yes :y Hot engine..30 secs on tickover
https://dl.dropboxusercontent.com/u/70807181/Livedata_2002%20%282%29_Omega-B_Engine__Z%2022%20XE_201411171302.csv
WOW thanks for that Bigtime :y. What did you use to gather all that, if your allowed to say :-X
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Oh and used to P1555ing in the wind for weeks now ;) ;D
Now that did make me chuckle :y
I've been through the TIS procedure for this code, and its wishy washy, and points to a few things, including ECU. Typical dealer type repair then ;D
Every time I typed it, it looked just like pisss so you gave me the opportunity ;D
On some of the other forums I found while searching the error I read a lot of 'dealer said it was the ECU Throttle Body etc' followed by 'it cost me £xxx and still not resolved. Then I cleaned the breathers and it was fixed '. Not so in my case, typical ::)
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.... if Mr Beanz is finished with his Autel and kindly lets me borrow it again.
...
No problem :y
The Shitroen showed no faults! ??? ???
:y :y :y :y :y 8)
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how? The 2.2 is fly by wire
Still uses the pedal to accelerate (hence 2nd TPS at top of pedal), doesn`t go faster by magic Andy :P :)
I'd have thought that the magical engine ECU would accelerate without the pedal ..... :-\
As long as it gets a signal from TPS which is attached to the pedal via a double-ended balljoint linkage. The TPS when receiving said signal actuates the throttle pedal
So first suggestion is the throttle pedal - I did suspect this but made the wrong assumption about cruise - thanks Rob/Andy
Without live data, we're pissing in the wind. And the random part swapping may cloud it futher.
But I'd be looking for air leaks, or comparing MAF values with known good
Not exactly "random" TB, just a progression of the most suggested solutions, gleamed from here, to the more obscure as not getting any resolution.
Been all over it, like a car bonnet, looking for leaks, originally when I had the EGR gasket leak and again with this. Not found any. Wouldn't a leak be causing some other "symptoms"? If you can suggest a leak source that can cause just a P1555 error and nothing else then I would gladly test it, got used to the different flavours you get when sucking and blowing an Omega. Cue STMO ::)
Difficult to use a known good MAF, no one seems to have a spare. I have purchased a GM one to at least have some confidence in it's operation and it made no difference. So either they both have the same fault or the fault is somewhere else.
Is there somewhere on here a set of known good live data that i could compare with, if Mr Beanz is finished with his Autel and kindly lets me borrow it again.
Oh and used to P1555ing in the wind for weeks now ;) ;D
Yes :y Hot engine..30 secs on tickover
https://dl.dropboxusercontent.com/u/70807181/Livedata_2002%20%282%29_Omega-B_Engine__Z%2022%20XE_201411171302.csv
WOW thanks for that Bigtime :y. What did you use to gather all that, if your allowed to say :-X
One of them A1 code Killer/readers & live data Only Things :-X :-X
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Further to this I have read about "Throttle Adaptation" after working on or replacing throttle body or disconnecting the battery
Admittedly seems to be mostly with VAG and done with software, but also referenced to newer Corsa's and Vectra's and some kind of pedal trick
Is there such a thing on the Omega?
TIA Phil
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Further to this I have read about "Throttle Adaptation" after working on or replacing throttle body or disconnecting the battery
Admittedly seems to be mostly with VAG and done with software, but also referenced to newer Corsa's and Vectra's and some kind of pedal trick
Is there such a thing on the Omega?
TIA Phil
Nope
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Further to this I have read about "Throttle Adaptation" after working on or replacing throttle body or disconnecting the battery
Admittedly seems to be mostly with VAG and done with software, but also referenced to newer Corsa's and Vectra's and some kind of pedal trick
Is there such a thing on the Omega?
TIA Phil
Nope
S.A.S Ta :)
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Further to this I have read about "Throttle Adaptation" after working on or replacing throttle body or disconnecting the battery
Admittedly seems to be mostly with VAG and done with software, but also referenced to newer Corsa's and Vectra's and some kind of pedal trick
Is there such a thing on the Omega?
TIA Phil
Nope
Yep, according to TIS if pedal position sensor is/has been unplugged removed
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Further to this I have read about "Throttle Adaptation" after working on or replacing throttle body or disconnecting the battery
Admittedly seems to be mostly with VAG and done with software, but also referenced to newer Corsa's and Vectra's and some kind of pedal trick
Is there such a thing on the Omega?
TIA Phil
Nope
Yep, according to TIS if pedal position sensor is/has been unplugged removed
What about if battery disconnected or throttle body is replaced ?
And how ?
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So you've sorted it then ....... :y http://www.omegaowners.com/forum/index.php?topic=130958.msg1677417#new
The simplest/cheapest fixes are the best :y :y
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So you've sorted it then ....... :y http://www.omegaowners.com/forum/index.php?topic=130958.msg1677417#new
The simplest/cheapest fixes are the best :y :y
Dont think so Yet Andy :-\
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So you've sorted it then ....... :y http://www.omegaowners.com/forum/index.php?topic=130958.msg1677417#new
The simplest/cheapest fixes are the best :y :y
Big time is right - No - waiting for a TPS from Joff now
That post was about last years difficult to find little prob ::) http://www.omegaowners.com/forum/index.php?topic=126804.msg1617741#msg1617741 (http://www.omegaowners.com/forum/index.php?topic=126804.msg1617741#msg1617741)
Decided to just get a TPS and put it in.
Logically I have looked at everything else and this actually fits into why there are no other symptoms apart from the error code
Wish me luck - you can hold onto our Autel for now ;) ;D
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Update - HELLLLP
Have now replaced accelerator position sensor (thanks Joff) and no change
Borrowed Mr Beanz Autel Maxiscan (thanks) and although a limited number of live data items to look at there are two significant (to me)
Fuel Sys 1 reading from cold start (on petrol only) is showing CL (closed loop?)
when I short rev the eng it changes to OL_DRIVE
when I force the error (hold at 1500 rpm, spanner on) it stays on OL_DRIVE for about 10s then goes to OL_FAULT
To me this looks like normal operation until spanner light and then the error makes this change to OL_Fault
short trim come on an off with CL (expected) but is running at 10ish which might be high but engine cold
long trim is at 11.7
The other thing, and just discovered, is that while holding at 1500rpm on petrol and switching on LPG the revs go up to 2000, then back to petrol and drops back to 1500, That confuses me so going to see the LPG man as all this might be LPG system related, I don't know ???
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Further info
At idle, at normal temp
Fuel sys 1 at Closed Loop
RPM between 750 to 760
MAF g/h is varying up and down within same range all the time
Short Trim is varying around 0, but also going -ve for a short time
02 sensor 1 is constantly varying between .2v to .8v, didn't see it change but cant watch short trim at same time
Long trim is staying at 11.7 all the time. Would expect it to change as ST goes -ve so is this the prob ?
Is there a way of resetting the long trim, eg disconnect battery for X hrs, unplug ECU ? ? ?
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Silly question, cam sensor was GM?
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Silly question, cam sensor was GM?
Oh yes of course ::)
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Silly question, cam sensor was GM?
Oh yes of course ::)
Thought it was just checking.
Very odd. Have your tried disabling LPG to see if it remains? Pull fuse for LPG ECU?
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Silly question, cam sensor was GM?
Oh yes of course ::)
Thought it was just checking.
Very odd. Have your tried disabling LPG to see if it remains? Pull fuse for LPG ECU?
Had it to the LPG man today, had a quick look everything seemed OK, BUT, going back next week for more in depth look and to look at why LPG mix is so far out as to cause rev change.
But thanks for suggestion might try that over the weekend
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Update - bit involved, but this is
ANY comments would be appreciated (except STMO saying get rid and get an Astra ;D)
Had a long, 3hr, session with the LPG guy and his Autel DS708 reader on the car with his LPG software monitoring as well
Came to a couple of conclusions with what we found
Car stationary, Engine at full temp and only looked at data after fan had gone off, running on LPG and Petrol
this error, P1555 (throttle implausible signal), is a complete red herring >:( probably the only error the ECU can give with the data it is getting
the ecu is erroring ONLY under medium load (~2000rpm), tickover and full load appears to be giving normal readings and no OL
@2000rpm FUELSYS1 (O2 loop) initially goes OL_FAULT (no spanner) and if you immediately read pending codes there is a P0170 (Fuel trim)
@2000rpm P1555 seems to replace ??? P0170 as a pending code only after OL_FAULT is on for longer and SHRTFT1 holding at -25%
The spanner light does not always come on even when either code is stored - probably because it's pending and needs to persist
Used the Autel's test process and only reported A/C fault (no gas) and stereo (different one)
So its a fuel trim error, not really a surprise, but its NOT the throttle
LTRMFT1 has varied from 5.5% to 7.7% over the week on petrol only. Was at 11.7% before that. Stayed At 7.0% during the tests
SHRTFT1 between -6.5% and 0.6% at tickover
@2000rpm SHRTFT1 rises to 8% and starts to fall until FUELSYS1 goes OL_FAULT and then falls to 0.0% (0.6 to -0.6)
B1S1 has been changed and appears to be operating correctly @2000rpm (0.095v to 0.855v) when CL
MAF changed back to original (GM) and appears to be ok (2.9 to 3.1 g/s @tickover) and IAT changing as expected (24 - 49c)
@2000rpm B1S2 holding at RICH all the time (0.525v to 0.625v)
B1S2 changes to LEAN (~0.300v) when revs taken off but reverts back to RICH (0.625v) almost immediately and stays there during tickover
Previous test have confirmed no vac leaks to atmosphere
Clamping pipes from cam cover (air after MAF) causes immediate change in SHRTFT1 (-25%), so not them ?
Coil pack changed - just because I can - no change
So @ 2000rpm assuming no additional air at inlet but over fueling at exhaust
Cracked exhaust manifold ? replaced no change
Cat blocked or knackered ? - cataclean put through in march for MOT which passed emissions - but still suspect
B1S2 not operating correctly even though seems ok ? Have changed this (off old MIG) but tempted to replace with original or new
Do not suspect the plugs but will be changing them soon
Had wild thoughts such as high sump pressure feeding back through cam cover(rings) or bad valve stem seal doing same
#ConfusedofRochdale