e.c.m ground

[vrgsvette]

does anyone know where the e.c.m ground wire is located
in the engine compartment

 

[vigman]

Ohm...Ohm....Ohm

Ok, Ready...
Start chanting...
Ohmmmmmmmmm, Ohmmmmmmmmmmmm!

I'm assuming Coupe...

There are 3 grounds going to the ECM
( at this point)

All Black/white tracers ( crkt 450 )
on Pins
D3 & D10 ( on C1 )
And
A12 ( on C2 )
These are the 2 connectors on the ECM

ECM
C1 is the BIG connector (16 pin dual) Series "C&D"
C2 is the small connector (12 pin dual)Series "A&B"


These wires splice ( in the harness) at S 111
( for the Mass airflow sensor/Mass airflow relay/fuel pump relay/& tranny position sensor, assuming automatic)

The S111 splice is buried in the harness at the firewall feed thru behind the right hand cylinder head ( Not a pretty job)

Which ties to......
G-104 ( left side of engine by Oil temp sensor,
Big godzilla lug with other grounds on it)

In addition

The G 101/G-104 jump from the Engine Block ground Braid to the FRAME ground to the Battery Neg Small lead. The FRAME point is about under the Vac booster for brakes ( a little foward ) this ground point always gets rusted up!

Foot note
There is a TAN wire on Pin D-6 of the ECM connector ( C-1 ) which has a home run to the G-104 ground point.

There should be a total of 5 Big lugs on the LEFT side of the engine.

Braid to ground
Batt big Neg cable
& 3 wiring harness lugs
on the engine side (7 wires I think) on the G-104
(engine side ground point)



Hope this helps
Mike

( You can stop chanting now!)

 

[vrgsvette]

yeah i think that pretty much covers it. my vette is an 86 coupe.
hoping i have a grondig problem. not getting reading on my scan tool from the MAF,TPS, IAC, and the car is running in an constant open loop, thanx for the info vigman

 

[vigman]

Your Welcome

Wiring is always a pain....

but at least it's not like Lucas wiring.

Mike

Joke
Do you know why the Brit's drink warm beer?

Cause the fridges are wired by Lucas....



Oh well

 

[ironcity]

vigman,

Ohmmy that's a real gasser. :L

Sorry, I resisted but for only so long.

cheers

 

[Topless]

shocking , simply shocking.

But the theory is well grounded.

-MIke

 

[Rfranco5062]

Looking for fuel injector ground on
1987 Chevrolet Corvette