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Discussion Starter · #1 ·
Hi,

Just changed the engine in a Corsa C 1.2 Z12XE 2003 but it will not start. It is turning over but not firing... I have removed the coil pack and attached the spark plugs and there's no spark. Could it be a sensor or something else, or the coil pack itself?

Thanks,
Dan R
 

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Well yes, 1st make sure you have voltage to the coil, disconnect the coil and chack pin 2 of the plug to earth, with the ignition on you should read battery voltage. Unless the coilpack has been dropped and kicked around the floor I don't think checking the secondries will be needed. However you need to check the switching signal. I always use an LED bulb for this because it is easier. Reconnect the coil, but disconnect the injectors. Connect the anode of the LED to pin2 and the cathode to pins 3 or 4 or 5 or 6 Crank the engine and the LED should blink. (remember LED's are polarity conscious i.e they only work one way around)
 

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Discussion Starter · #5 ·
Hi,
Thanks for that i'll check with an LED tomorrow, i have already checked that there is battery voltage on pin2.
What do you mean by checking the secondries? Might be worth doing as i dont know the history of the pack.

Thanks
 

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Sorry I meant Primaries Disconnect the coilpack and measure resistance between pins 2 and 3, 2 and 4 etc etc you should measure about 0.5 ohm.
 

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Discussion Starter · #7 ·
Hi,

Ok I have battery voltage on pin 2.

To test the switching signals i used a 12v bulb circuit tester lead thing as i couldnt find a LED (dont know if this makes a difference) but the bulb did not flicker.

The resistance between 2 and 3, 2 and 4 etc all measured 0.7ohms

Does it matter that i tested the switching signals with a bulb not a LED, and if not any ideas what the problem might be?

Many thanks
 

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If you have zero switching I would look at the crank sensor or ECU power relay/fuse and wiring. As for the bulb I have never used one, always used an LED for coil switching as the voltage varies so much between systems. Try a multimeter, although I find these to be too slow for a decent reading. Another reason to use an LED lol.
 

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Discussion Starter · #9 ·
Still no joy, i have changed both the crank and cam sensors and still no switching signals. I tried both the bulb tester and a multimeter (still cant find an LED)

All fuses are ok, which relay is for the ECU?

Thank you
 

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Are you using your original ecu and also original inlet manifold and wiring loom on inlet?
 

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Only asking as have found differences before ie semi auto loom different from manual,have you done code check
 

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check pin 2 of the coil multiplug for 12V and check pin 1 for continuity with an earth. The EC power and fuel pump relays are side by side in the fuse box it should be numbered 7 or K46 Also if you cant find 12v at pin 2 of the coil plug check fuse number 30
 

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Discussion Starter · #14 ·
There is battery voltage on pin 2
There is continuity with earth on pin 1
I have tested relay no7 and it is working

:(
 
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