got the engine turning over, but no sign of a spark and certainly no noise coming from the fuel pump when the ignition is turned on. The ECU relay is getting the correct voltage but i don't know where else to look. Fuel pump runs when bridged out.
I would look at the fuel pump wiring No really, I guess this is a modified loom, Standard ECU? What number fuel pump relay do you have, Working ok? Do you have VCDS? Would be a way to check the ECU is powering on.
modded loom by rubjonny, using the mk1/20v loom, checked the fuel pump relay, works ok off the car, don't know how you test it on the car. it s the standard 62 relay.( think its 62, what ever is stock on the mk1 GTI. Stock ECU.
how do jon! you need to replace the old k-jet pump relay with a 67, 80 or 167 from mk2 digi/16v or any mk3 petrol, plus most other 90s vw and seat. the stock one relies ona rev counter signal to work, which would be why its not working if your adaptor isnt fitted yet or isnt working for some reason. you can rule out all fuel pump control issues by fitting a #17 or 18 relay in the fuel pump socket temporarily, this will make pumps come on with the ignition. the 17/18 is the x-over relay which powers wipers etc, so car will run without it while you test tci is long gone
another forum another answer from RJ will give it a bash tomorrow night, rev counter adapter is now in, though from a previous forum post i'm yet to find out if it is indeed getting the ignition live supply. that will be tested tomorrow to
right fuel pump runs on relay 17 got myself 167 but no fuel pump running, try the other two or are they all the same?
67, 80 and 167 are all the same, could be your 167 is bust? if another one still no worky then that suggests ecu isnt powering up or the earth trigger wire from ecu to D/13 is damaged. does the car run with the 17 relay fitted? if so then suggests ecu is happy and its a wire problem, if not then something else isnt right with the wiring
Will have another check over the wiring, not tried the car with the 17 fitted, as i found whilst testing that out, that the fuel lines/pump needed attention as they were p*ssing fuel out.
D/13 is a purple/white wire, can't see where it goes back to in the ECU loom harness to check its continuity. On ignition live should you get continuity to earth on that wire? to check its all ok. Is there any other way of indicating that the ECU is powering up?
d/13 should earth for a few seconds on the first turn of the key, then go to earth when cranking. this runs to ecu pin 65 if you want to test for continuity. if you could get the diagnostics going that would tell you if the ecu is powering up check the ecu pins: 1 - earth 2 - earth 3 - ign live 62 - permanent live 121 - ign live coilpacks should have ign live to pin 1, and earth to pins 2 and 4. 3 i think is a pulsed live from ecu? if you disconnect the ecu plugs and look at the front you can see a purple tap, if you slide that out you can pull the wire holders out the back for better access to test the wires. also the pi9n numbers are written on the wire holders which can somtimes be easier to read than the numbers inside the back of the socket?
All ok bar the ECU pulse on the coil packs as i need another set of hands to test that one out. Next step is to take all the wiring out and start again with connecting it up and see if I have missed something out.
just from the info I have, checking the coil pack Coil Pack 1 Battery Voltage (12V) from Relay 428 2 Earth 3 Pulse 12V or Earth to trigger Coil pack 4 Earth from relay 428 - Dins 30 Fused Battery Voltage (12V) 87 Feeds Coil Pack Voltage (table above) 85 Earthed trigger from ECU 86 Fused Battery Voltage (12V)
where is relay 428 then? The info from Chris is similar to yours, which checks out ok bar me not being able to test the coil 3 on my own, unless i've missed a trick in doing that? Is there an upper and lower limit that the ECU needs in terms of voltage?
428 is the factory mk4 relay, so dont worry about that. your ecu relay is the #53 at the top of the fusebox the ecu wants as close to battery voltage as possible, the ecu relay takes care of the ecu and coil power and so it should see good voltage
readings taken with ignition on relay 53 30 12.12v 87 12.12v 85 no voltage but showed earth when tested 86 12v Coil 1 12v 2 earth 3 Can't test 4 earth Thanks for the help so far, when you turn ignition to on you can hear the 53 relay click open.
