A2 VR6 FAQ

[bonesaw]

What position are 94 and 79?

[Moment Of Truth]

Ya iknow what u mean but the car cranks over fine just no check engine light witch means I have no power to the ECu, correct?

[Moment Of Truth]

What position are 94 and 79?

It's one of the top ones gotta look again

[bonesaw]

Check your grounds.

[Deezy]

Ya iknow what u mean but the car cranks over fine just no check engine light witch means I have no power to the ECu, correct?

Oh sorry.
The cel should turn on with key in ignition on to show that the lights works and the system is functional.
Do you have a multimeter?

[Moment Of Truth]

Oh sorry.
The cel should turn on with key in ignition on to show that the lights works and the system is functional.
Do you have a multimeter?

Ya I got one

[Moment Of Truth]

Also have a wire the splits in to 2 wires not sure if it supposed to be grounded or powered it comes from below the wiring harness hole in the firewall in the bay

[Deezy]

Color??

[Moment Of Truth]

Black

[Moment Of Truth]

I have them ground to the negative connector

[Moment Of Truth]

Also have these grounded to the back of the head

[Deezy]

Also have these grounded to the back of the head

Those are supposed to go onto the body. This could be the problem. Those bolt down next to the battery.

[Moment Of Truth]

Those are supposed to go onto the body. This could be the problem. Those bolt down next to the battery.

I thought it dosent matter as long as its a ground? Also can't put them in that spot because I grinded the stub thing off

what should I check for power for the ecu 1, 5 54,55,56 pins , Fuse 15 , ? What else

[bonesaw]

Do you have a good body ground?

[Moment Of Truth]

Do you have a good body ground?

Na I don't have anywhere to ground except back of head negitve connector to the batterty an tranny ground

Also checked my ecu pins 56 has 12.6 volts ?

[Moment Of Truth]

Do you have a good body ground?

Those are supposed to go onto the body. This could be the problem. Those bolt down next to the battery.

Just made a body ground no difference

[bonesaw]

do you have a ground from body to battery? and then battery to trans?

[Moment Of Truth]

do you have a ground from body to battery? and then battery to trans?

Yes

[Moment Of Truth]

Figured out half my problem put these black single prong wires in there and check engine light lite up now my problem is the the key is on the time and miles fade away

[Deezy]

Doesn't that plug go to the alarm Module? My swap doesn't have that relay.

[bonesaw]

you have a grounding issue.

[Moment Of Truth]

you have a grounding issue.

I have every thing grounded Don't think that's my problem. Missing some type of connection under the dash i think I'm pretty sure I've checked my grounds hundreds of times already also used my multimeter to even check them it's not my grounds

[Deezy]

I have every thing grounded Don't think that's my problem. Missing some type of connection under the dash i think I'm pretty sure I've checked my grounds hundreds of times already also used my multimeter to even check them it's not my grounds

Whatever the issue is. Your losing power when u turn the key on?
You can unplug the ignition switch and see if you cannot make a little temp jumper for acc and than arc the starter wire. That would tell you if it's ignition related. Seems like a short in the ignition system to me. Hard to tell.

A2resource has the wire colors for the ignition switch. Red is hot. Black and black/yellow are key on and red/black is starter. Don't quote me that's off the top of my head.

[bonesaw]

What exactly is happening?

[bonesaw]

ok check with meter.
put red on pin 54 and black on pin 1.
if you get nothing put red on + of battery. and black on pin 1. This confirms the ground is good.
Then put red on 54 and black on battery - to see if that is the problem
Then turn the key on. put red on 23 and black on pin 1.
while ignition is on confirm 54 still has power.

If there was a bad ground to ECU it may have blown the ECU.

[Moment Of Truth]

ok check with meter.
put red on pin 54 and black on pin 1.
if you get nothing put red on + of battery. and black on pin 1. This confirms the ground is good.
Then put red on 54 and black on battery - to see if that is the problem
Then turn the key on. put red on 23 and black on pin 1.
while ignition is on confirm 54 still has power.

If there was a bad ground to ECU it may have blown the ECU.

54 to 1 12.36 volts
+ to 1 12.35 volts
So guessing ur right I have a bad ground how else can I ground these wires ??

[Moment Of Truth]

Meter is supposed to be on this right ?

[Deezy]

Meter is supposed to be on this right ?

What did it read when you turned the key on?

[bonesaw]

54 to 1 12.36 volts
+ to 1 12.35 volts
So guessing ur right I have a bad ground how else can I ground these wires ??

How did you reach that conclusion? Lol. Where are the rest of the tests? So far this tells us the ecu is getting proper power and ground. What about switched ignition?

[Moment Of Truth]

How did you reach that conclusion? Lol. Where are the rest of the tests? So far this tells us the ecu is getting proper power and ground. What about switched ignition?

I was just guessing because the volts were coming up ? but I got tired last night about to do the rest now I'll post in a sec

[Moment Of Truth]

23 to 1. 10.5volts
54 to 1 10.4 volts

[bonesaw]

what is battery voltage? looks like your battery is going low. do you have another ECU to try? is it obd1 or 2? does the throttle adapt if obd2? have you tried scanning for codes?

[Moment Of Truth]

what is battery voltage? looks like your battery is going low. do you have another ECU to try? is it obd1 or 2? does the throttle adapt if obd2? have you tried scanning for codes?

Battery 12.6 volts and no don't have another ecu also it's obd2 jettA and no have not tried to scan for codes yet

[Deezy]

Try a different battery.

[krantzmonkey]

well folks its been a year and a half in the making but as of about 24 hours ago another mk2 vr6 was born! fired up second time around... right after i figure out power to the proper places makes all the difference. still much to do but shes coming right along... more updates to come. a HUGE thank you to all the gurus... you know who you are! i d say if we ever get a chance to meet i d buy you all beers but reading over the last 151 pages i think you guys might still be drunk! anyway a lousy cell pic for now... again thanks all!