Aygo 107 c1 2010 not start

[Fredfr78]

Hi everybody
107 mk2 2010 1.0 only 16000km donÂ’t start.
I try various manipulations but car donÂ’t start.
Motor compression about 14bar per cylinder.
I have the 2 original Keys of this vehicle.
I donÂ’t have dtc fault in any ecu. (Ecu motor, immo, abs, airbag). With Diagbox all immo parameters are ok in immo.
I check all wire harness motor, All is ok.
I read a lot of problems on communication between Immo and Motor ecu but in my case wires are 100% ok.
I check with an other motor ecu but problem is the same car donÂ’t start.
I try sync by diagbox. I try also by pin 4 and 13.
Car donÂ’t want to start!!!!
I don't have a spark in the candles.
I think my immobox is dead but no fault in this ecu and his parameters are all ok.

Any ideas ?

Thank you

[esse]

Hi,
may be can help you...........

[Fredfr78]

Thank you for your answer. I will check and I will come back to you.

[key4man]

You have a short wire between the immo box and the car ecu,the fault code B2799
The two shortening wires are purple / white and green / white,
Cut the two wires, and put new , and start the car

[Fredfr78]

No its not my problem. I have already cut and passed new wires between immo and ecu. Purple and green.
as I explained I have no fault code in Motor ecu. B2799 not present.
Thanks

[Fredfr78]

Today I test all parameters of keys. All is ok. Thank you to Esse for description of tests.
Always no fault code in motor ecu and immobox. I don’t understand.
Any idea?

[rob h]

No spark. That is not immo related.
It will always ignite the fuel, to protect the cat.
Immo will cut off injection, after few seconds.


Remove backseat.
ign off, close car.
open car, turn ign on.
Listen if you hear the fuel pump prime.
Then start car.
If it starts, and then stalls, it is immo.

No priming off fuel, or no spark.
Replace the ecu.
No need to program, just check spark and priming first.
If improvemend is made.
Then Program a replacement ecu.

If changing ecu, does not improve. check wiring

[Fredfr78]

Fuel pump is ok, when Ignition on I ear the pump.
fuel hose has good flow to the engine.
Yes I havenÂ’t spark. I have already tried with another ecu (exactly same reference) but no spark too. Are you sure that an other no programmed ecu give spark? Or itÂ’s necessary to program to have spark? Because when I tried with replacement ecu b2799 appears. Try sync with diagbox, donÂ’t work. B2799 still appears. With my original ecu b2799 disappears. next week I will try to program the replacement ecu to see if B2799 disappears With this ecu.
I have already checked all wires of harness.
12v of ignition coil is ok.
Camshaft sensor ok.
Crankshaft sensor ok.
When I try learning throttle body with diagbox, opération failed. All diagbox parameters are ok.
I think I'm missing a signal to send the command to the candles. But camshaft and crankshaft ok.