Need wiring help with ECU starting circuit? PIN #1

[G60 Carat]

edit: To answer my own question and in case anybody lands here on search.

Pin #1 on the ECU is power when cranking only.


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I need a quick answer to this one. Should Pin #1 (+12v during starting) keep receiving power after the car has started? or is this strictly to tell the ECU it's cranking now? I may have had it wired wrong for a very long time.....



1 Start (50) red/green
2 OXS purple
3 Fuel pump relay red/green or yellow/blue
4 Knock sensor white
5 CO Adjustment blue
6 Ground (Sensors)
throttle switches
OXS
Hall sensor
Coolant temp.
CO pot/Air temp. --- brown/white

7 Knock sensor brown or yellow in shielded black cable
8 Hall sensor red/black
9 Air temp sensor blue/white
10 Coolant temp sensor brown/green
11 Idle Switch red/blue
12 Injectors red
13* Ground ECU brown
14 Power main / Idle stab. valve black/white
15 Full Throttle Switch blue/black
16 not used
17 Not used
18 Hall sensor green/white
19 Ground brown
20 MIL yellow - Yes This is the wire the bling bling blinks the fault codes off your eprom! You did know that your ecu stores sensor fault codes?
21 Not used
22 Idle stab. valve black/yellow
23 Not used
24 Not used
25 Ignition coil green

[weejunGL]

okay, this is an extremly old post! just to have said it, i've read the date on the post


however...


i'm about to redo my harness (due to age and brittle/cracked) wires etc

i've got the DF1 plug from a G60 here, but a few of the wires don't match either color or placement as seen on the pic in the post above ..

so. do we KNOW that the info in this post is good s-hit?




Dan

[G60 Carat]

The pin out is 100% correct. (it's showing as if looking at the Harness, not the ECU)

Now the colour could be different in Europe, or even different Corrado to Passat to Golf/Jetta.

Do you have the whole wiring or just the pigtail? (meaning the ECU plug with some lengths of wire?) you could have a CIS-E ECU plug, it's the same as DF1 (ECU main plugs were the same but actual wiring couldn't have more different if they tried)

I only know that because I was looking for a spare G60 harness and found what I thought was it because I test plugged it into a Digi1 ECU. But then after I pulled it out of the box and looked at it for second I realized it was a CIS-E harness.

I can't find the bigger version of this one, but it's very good.

[weejunGL]

The pin out is 100% correct. (it's showing as if looking at the Harness, not the ECU)

Now the colour could be different in Europe, or even different Corrado to Passat to Golf/Jetta.

Do you have the whole wiring or just the pigtail? (meaning the ECU plug with some lengths of wire?) you could have a CIS-E ECU plug, it's the same as DF1 (ECU main plugs were the same but actual wiring couldn't have more different if they tried)

I only know that because I was looking for a spare G60 harness and found what I thought was it because I test plugged it into a Digi1 ECU. But then after I pulled it out of the box and looked at it for second I realized it was a CIS-E harness.

I can't find the bigger version of this one, but it's very good.

the harness is with pigtails, and comes from a 1990 Passat g60 which had a fire in the enginebay.

reason why i was wondering was because i've got (different colors, yes) but also a few wires where this information says i should have none.. give me a few minuts, and i'll write down color and placement

[weejunGL]

Okay, heres my plug


Pin - Color

1 - red/green
2 - purple
3 - red/yellow
4 - white (knocksensor wire)
5 - blue
6 - brown/white
7 - brown (knocksensor ground+shield)
8 - red/black
9 - blue/white
10 - brown/green
11 - red/blue
12 - brown/yellow (heavy gauge)
13 - brown (heavy gauge)
14 - black/yellow (heavy gauge)
15 - blue/black
16 - empty
17 - empty
18 - green/white
19 - brown/black (heavy gauge)
20 - empty
21 - empty
22 - white
23 - black/white
24 - empty
25 - green (heavy gauge)

[Roger@Silvern16vT]

Old post but I try

I Have the same question like the tread starter...

Does the pin-out 1 have to have 50-power? Power under start?
Why? does the ECU need to know it's crankin?

This wire haven't got any power on mye car (digi 1 in 1986 golf gti, with 16vT)
Looked at the pin-out 1 on ECU, and the wire is red.

---Wire-Harness from Passat G60 Syncro (euro version)---

[G60 Carat]

pin 1 is power only when cranking. it must do something with the starting circuit, maybe adds more fuel and opens the isv to try and speed up starting, im not sure what. But that is how it should be wired.

[Roger@Silvern16vT]

Okey, the wire is not connected on mye car....but it works.
Maybe my lambda problem is here ? (the wire is not connected to anything)
It's take very long time before the lambda starts regulating (new bosch O2 sensor last week)

Maybe the ECU needs info from the 50 wire? hmmmm...can try it out and connect it to 50.

[weejunGL]

Okey, the wire is not connected on mye car....but it works.
Maybe my lambda problem is here ? (the wire is not connected to anything)
It's take very long time before the lambda starts regulating (new bosch O2 sensor last week)

Maybe the ECU needs info from the 50 wire? hmmmm...can try it out and connect it to 50.

it takes the LC-1 about 30 seconds to heat up during that time i does not output anything to the ecu


anyhow, the ecu does not see the sensors until its warmed up anyway. but if you start the car after its warmed up, it will try to read the lambda, even tho it does not give any info to the ecu until the sensor is fully warm

[G60 Carat]

Old post but I try

I Have the same question like the tread starter...

Does the pin-out 1 have to have 50-power? Power under start?
Why? does the ECU need to know it's crankin?

This wire haven't got any power on mye car (digi 1 in 1986 golf gti, with 16vT)
Looked at the pin-out 1 on ECU, and the wire is red.

---Wire-Harness from Passat G60 Syncro (euro version)---

Not sure what the function is, it might open the ISV valve and pump some extra fuel to speed up starting. It might be for if you ever flood engine to be able to to tell the ECU ypu are WOT and cranking at the same time, so don't add more fuel. All just guesses, but there is lots of reasons why the ECU might need to know when the engine is being cranked over.

[chc-rado]

Not sure what the function is, it might open the ISV valve and pump some extra fuel to speed up starting. It might be for if you ever flood engine to be able to to tell the ECU ypu are WOT and cranking at the same time, so don't add more fuel. All just guesses, but there is lots of reasons why the ECU might need to know when the engine is being cranked over.

I'm really sure terminal 50 is there so 12v is not loss when cranking. It's like additional 12v signal. ECM are happy when there 12v and grounds at any giving time. Including when your cranking the engine. That just my thoughts on it.

If want see what happen without terminal 50, de pin it, and see the difference, if there any difference. Just saying.

[G60 Carat]

I ran without it for 6 years, didnt really notice any difference after putting it right. But cant hurt do it correctly right.