g60 breakdown (electrical) help please!

[mimjed 0]

well car started and was happy on tickover then cut out.

 

thought it was coil intitally but never known one to go like that. all tested, weak but working.

 

seems to come down to the green wire which feeds to it.

 

is there an ignition amplifier? if so where? alternativly is there a switch that feeds it? if so again where?

 

finally what i fear it may be, two pins were getting hot from the ecu and the volts adjust with ignition cranking so i assume this is part of the circuit. ecu dead?

 

help please, asap.

[DanVW 0]

Have you replaced the ECU relay since you have owned the car? Mine started doing the same just after I got it but after replacing the ignition switch and relay it was fine.

 

Cheers

 

Dan

[mimjed 0]

Will give it a go on monday boss, if it doesnt work i have to drive a 106. Bad times

[mimjed 0]

well im driving a 106 :nono: christ there horrible.

 

changed ignition switch, and went with the assumption 67 relay has now been replaced with 167 relay for the ecu.

 

still no spark :(

 

so anybody have any idea whether the green cable to the coil has a switch on it? or is the ecu dead?

 

cheers jim

[DanVW 0]

Sorry chief having a hard time picturing the cable you mean, pics may help also I guess you have checked the dizzy make sure its nothing obvious like the arm being in bits? Is the timing all ok do all the marks line up with the dizzy at TDC?

[mimjed 0]

no spark to the king lead so dizzy isnt the problem. the cable sits in a sort of h braket on the furthest away side from the front of the car. on the other side of the coil you have the black cable.

 

err pic, its the green wire behind the king lead http://forums.vwvortex.com/showthread.php?4758227

 

followed the wire back and it goes straight to the ecu. with no sign of an ignition amplifier i guess it is the ecu thats at fault

[dirtytorque 0]

do you measure 12 volts on this and indeed the black wire on the other side of the coil when the ignition is on?

[mimjed 0]

black cable is fine. cant get an earth reading on the green cable at all.

 

where the hell is the ignition module then? have been told to follow back the wires to it from the coil but green striaght to ecu, black back towards fuse box...am i missing a cable?

[Rob_B 0]

The green wire is for the rev counter. The coil should be energised all the time and the dizzy should distribute the spark. Is there power across the 2 pins on the coil?

There is no ignition module on a g60

[dirtytorque 0]

the green wire isn't for the rev counter.it is the signal from the ecu to fire the coil.It goes to pin 25 on the ecu plug connector.

It should be at 12 volts.To fire the coil it is pulled low to ground by the ecu for a few milliseconds.You'd need a good multimeter to see this or an oscilloscope.

You shouldn't get an earth reading on the coil. :?

 

G60 do not use an ignition module.

rob_b yes some g60 do indeed get its signal directly from the coil(Not mine) although i believe that this wire is red/black.

[mimjed 0]

i didnt think there was an ignition module, but you can buy them off egay?

 

had a barny on the phone with an auto electrician today, he was adamant there was one and wouldnt test the ecu unless it was tested.

 

i didnt do any of the testing, broke down in a pub car park so sunk a few pints to cheers myself up. he wasnt looking for an earth on the coil, rac man said that you should be able to find an earth reading on the green cable itself. but there was nothing at all, ignition on or off and cranking.

 

he was certain the problem is steming from the green cable, and that it would be a switch or an ignition amplifier as the most likely cause. at a push may be a broken wire.

 

as far as im aware the coil is not getting power, so sending no spark.

[dirtytorque 0]

As I have already said the ecu switches the green cable to earth when the engine is running to fire the coil.While the engine is not running you will not see an earth on the green cable.If the green cable was held to earth too long it would over charge the coil and damage it.

Was he cranking the engine over while looking for this earth signal?if he was and he had the right test gear then he could of checked for the earth pulses.

Other than that you have just come across an mechanic that wasn't familiar with the system.

Maybe take it to Vw or a Vw specialist.

There is no ignition module on a g60.

He is confusing it with a valver.

Good luck.

[mimjed 0]

as far is i know he was checking for pulsing, he asked me to crank it while he was testing it.

 

ive been given the number of a chap who is supoosed to be on the ball with g60's so going to get him out on thursday :(

 

well gutted, hate paying people to fix things for me.

[Rob_B 0]

My mistake, thanks for correcting me.

Unless you had an analogue meter or oscilloscope then you wouldn't see an earth pulse from the ecu

[mimjed 0]

he had a fair amount of kit out to be honest.

 

should have asked more questions really but just wanted to go home after a 12 hour shift, beers and then an hour and a half wait for them to turn up.

 

fingers firmly crossed for thursday.

[mimjed 0]

well thursday has been and gone. sadly im not any further with this.

 

after a bit more investigating.... digifant 1 4.0 25 pin has no ignition module. digifant 1 4.3 40 pin has ignition module.

 

mine is a 4.0 as i thought.

 

seemingly no power reaching certain circuits of the ecu, so finger is pointing at meta m36t2 immobiliser. still unsure of damage to ecu.

 

really have no clue on it so plan on removing the immob tomorrow, really dont want to do it but needs must.

[mimjed 0]

well immob is out and still no good. no power to ecu.

 

im stuck :(

[dirtytorque 0]

ignition switch or ecu relay

[weetos 0]

Hall sender?

[dirtytorque 0]

No,as said if you have no power to your ecu pls try the ecu relay or ignition switch.

Thnks.

[mimjed 0]

hall sender working hooked it up to a scope to double check.

 

first thing i did was ignition switch and ecu relay. no joy.

 

starting to think the fuseboard itself may be the problem but got fed up with looking at it this morning so towed it to an electrical specialist :(

 

not looking forward to the bill.

[mimjed 0]

well it turns out there was nothing wrong with it. the chap did his fault finding on the wire, fault near to ecu.

 

had a look at the loom nothing wrong, cracked open ecu, nothing wrong. plugged it back in. tried the key and it started.

 

bloody car :(

[DanVW 0]

Glad its running again dude :) some times it just goes like that, I called the AA out once when the alt light came on in my mk2 GTi all he did was undo one cable sand the crap off it and put it back on... Cost me over £100

[dirtytorque 0]

it's just testing you lol.

:)

[mimjed 0]

yeah im so glad its running again. gave it a good telling off against an audi a5 :lol: