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Thread: ECU Identification / wiring diagram.

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    Default ECU Identification / wiring diagram.

    Hello guys, after a bit of help here. I have a 1.8 Petrol/LPG Vectra and it has an open circuit on injector no. 3 (Petrol injector) It is the wiring / ECU rather than a dodgy injector. So my first task is to try and identify which ECU is responsible for what. So a question for you 1.8 petrol guys, which ECU’s in these photos do you have on your cars? (Im assuming that I will have an extra ecu for the gas system, which i think is no.2 in my photos based on an educated guess about how these systems work) and what is each ECU responsible for?
    Cheers Gavin.






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    ecu number 3 is the engine ecu ... unit number 2 is the pug and play unit for the lgp system number 4 is the lpg ecu ....number 2 is the throtle body plug ?? ............first you need to return the car to "normal" .i mean take of the lpg system for a while to see if it is that that is faulty, number 2 is the conection between the lpg and petrol system ..all you do is unplug the lpg system the plug and play is a loop system ...the plug / wire with the white label is the original car loom on the pug and play (number 2)the other loom on the plug and play has to be removed from the engine ecu (number 3) and then the original loom fitting to its place ,take care not to break any pins in the plugs...if you feel you cannot do it try and get some one that knows how to do it to do it

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    Thanks Benny, that should be a great help. I will try that tomorrow evening.

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    OK just been out and tried that. With the lpg loom removed, and the original loom plugged into the engine ECU, the injectors are all working as they should.

    So next up is to check the wiring. Benny, would you know which pins on the original petrol loom are for which injectors? or even better, does anyone have a wiring diagram for the petrol and/or lpg injection system?

    Many thanks

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