It was the logic ground circuit!!!!

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Jan 22, 2011 | 04:34 PM

troop1

Thread Starter

Newbie

Joined: Jan 2010

Posts: 6

Likes: 0

From: Pleasant Hill ca.

Year: 1991

Model: Cherokee

Engine: 4.0l

It was the logic ground circuit!!!!

I had a speedo, tach and fuel gauge go out all at once. It turned out to be a open in the logic ground circuit. a quick jump to ground and I'm back on the road.

thanks to those who tried to help.

Jan 22, 2011 | 04:59 PM

freegdr

CF Veteran

Joined: Mar 2010

Posts: 47,923

Likes: 38

From: Broward County Fl.

Year: 1989 xj sport 2dr

Model: Cherokee

Engine: 12 hole bosch Injectors

where was that there are other people with the same prob

Jan 22, 2011 | 07:10 PM

greengoblin

Senior Member

Joined: Dec 2009

Posts: 538

Likes: 3

From: zeeland mi

Year: 1997

Model: Cherokee

Engine: 4.0

yes please where was it

Jan 23, 2011 | 03:37 PM

troop1

Thread Starter

Newbie

Joined: Jan 2010

Posts: 6

Likes: 0

From: Pleasant Hill ca.

Year: 1991

Model: Cherokee

Engine: 4.0l

Logic circuit

the logic ground circuit provides a ground for the speedo, tach and fuel gauge. Its the green and black wire found in the B2 slot of the black/blue connector at the back of the I/P cluster. I spliced into the green and black wire and grounded it at the fuse block under the dash.

This is a temp repair but will work until I can find out if the ECM is responsible for the circuit or not.