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Philipopo
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Joined: 20 Oct 2022, 19:32

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Post by Philipopo »

Does anyone knows the cause of this 2 fault marked here please. This is for Citroen C4 B7 with automated manual gearbox. I had replaced the engine, but has refused to start up.
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GiveMeABreak
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Re: Help

Post by GiveMeABreak »

The gearbox ECUs on these vehicles can also be paired to the engine ECU. If you have changed to a different engine ECU or the engine is not identical, then it can stop the car from starting as you can see from the diagnostic information - the engine ECU is not authorising the starting of the vehicle as it's getting the request from the gearbox ECU, but not the authorisation.
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xantia_v6
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Re: Help

Post by xantia_v6 »

I would expect that live data in the gearbox ECU will give the cause for it not authorising the engine start.