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Discussion Starter #1
Hi guys!
Hope you can help.....
I’ve jammed a Z20let into a Corsa C I think I’ve got all the wiring correctly connected but I can’t get the engine to start.

One concern I have is pin 2 on connector A on the ECU. Where do I connect that to on the Body harness?
 

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A photo would be good.
Is the 2 pin plug on body or engine side of ECU? There should be a 6 pin plug on body side and a 3 pin on engine side.
6 pin is for power to ECU and some sensors to body. 3 pin is for one of the map sensors usually mounted near the ECU.
 

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Take a photo of the plug you do not know where it goes and where it is on the loom.
In the UK the plugs all have X numbers on schematics.
 

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Discussion Starter #5
Ok, let me try explain this again.
(The connectors on the old ECU Z17DTH did not fit on the Z20LET so I hacked them off.)
On the ‘A’ connector (body side loom) of the ECU, pin 2 is an input/output from the immobilizer.
What do I wire this to?
 

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This is for Z18XE to Z20LET but should help you. It is for the pin locations body side of Z20LET ECU.
There is 2 wires for the Immobiliser.
z18xe z20let wires.jpg
 
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