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Author Topic: After Cruise control no throttle response  (Read 8311 times)

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mong00sehun

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After Cruise control no throttle response
« on: 19 April 2024, 15:01:05 »

Hi Guys!
Today i had a little wtf moment with my omega. B2 Sedan 2.6 V6 manual elegance. I had my cruise control at steady 70km/h, and i accelerated the car via the cruise control button. I held the button for around to get 85-90km/h and then i heard some noise from the back, then the TC icon appeared, and the rpm is dropped down around the idle revs but a little higher around 800rpm, and then i tried to accelerate but there was no response from the engine, i floored it but nothing happened. After that, i turned off the engine, and started, and its working just fine ever since. I tried to reconstruct the scenario but i couldnt, i will try again after work... Whats can be wrong with the car? Maybe the throttle body?
Thanks

ps: this is my first post, sry for broken english solutions xd
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DrAndyB

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Re: After Cruise control no throttle response
« Reply #1 on: 19 April 2024, 16:46:25 »

If its the 2.6 and Facelift I assume its Fly by wire (as opposed to older cable cruise control on my 2.5 pre-facelift).

Could have been a electrical gremlin switching it off ? or iffy brake pedal switch which also turns off cruise when brakes pressed ?

Just a thought.

Andy,
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mong00sehun

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Re: After Cruise control no throttle response
« Reply #2 on: 19 April 2024, 21:17:42 »

hi again
i reproducated the "error" successfully
so there are one more factor -> cold engine
after work i do the excact same thing: with cold engine from 70km/h i accelerated to 90km/h with the cruise control button (i holded, not pushed) and at 90km/h i heard some noise from rear i think it was the rear brake, then the TC icon appared and the accelerator pedal went full silent, but if i floored it, the "lifted" idle rpm (800 when this is happened) jumped up to around 1200. Then i tried reproducate again with operating temperature, then everything works just fine. I tried many gear - speed combination (eg.: at 4th 50-90, 60-90, 5th 80-90, 90-110) but everything is great when the engine is not cold. My car has chip tune (~196HP on dyno), maybe it has some "bug" with cold engine and specific butterfly valve position?
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Doctor Gollum

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Re: After Cruise control no throttle response
« Reply #3 on: 19 April 2024, 21:17:54 »

Any fault codes?

Could well be a tuning issue.
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mong00sehun

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Re: After Cruise control no throttle response
« Reply #4 on: 20 April 2024, 11:13:51 »

Yeah, P1600. hmmm...
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Doctor Gollum

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Re: After Cruise control no throttle response
« Reply #5 on: 20 April 2024, 12:00:40 »

There's your answer then.

You'll need the ECU, (2.6 or 3.2 will work fine, but it will need to be told it's not an auto), plus the chip from the key and the transponder ring. Ideally also the car pass from the donor car.
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dave the builder

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Re: After Cruise control no throttle response
« Reply #6 on: 20 April 2024, 17:30:26 »

A "P1600" doesn't confirm the ECU is dead or faulty
it could be a damaged loom, connector pin, blown fuse .poor earth ,trapped wire or similar
even a sensor plugged in the wrong part of the loom or moisture ingress 
proper inspection and methodical diagnostics are required  ;)
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mong00sehun

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Re: After Cruise control no throttle response
« Reply #7 on: 20 April 2024, 18:45:10 »

thanks all, fortunately i have a handsome mechanic who will look after this error
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Doctor Gollum

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Re: After Cruise control no throttle response
« Reply #8 on: 20 April 2024, 18:58:09 »

A "P1600" doesn't confirm the ECU is dead or faulty
it could be a damaged loom, connector pin, blown fuse .poor earth ,trapped wire or similar
even a sensor plugged in the wrong part of the loom or moisture ingress 
proper inspection and methodical diagnostics are required  ;)
But it has been chipped, so much more likely the issue  ;)
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TheBoy

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Re: After Cruise control no throttle response
« Reply #9 on: 23 April 2024, 08:45:40 »

P1600 is generic.  You also need to look in other modules on same CAN - which on Omega is ABS and TCM...   ...and this one is a manual, so that will possible give a clue...

The TC light is controlled by the ABS module, so that will definitely have a fault code stored as well.


Its unlikely to be an ECU failure, as these are rare on Omegas.  It could be bad programming, though.
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