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Unread 07-12-2013, 02:46 PM   #1
mipstien
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1991 YJ Wrangler 
 
Join Date: Jul 2012
Location: Walland/Knoxville, Tennessee
Posts: 57
yj distance sensor

My speedometer is working but I have been reading and I noticed if you don't have both plugged in you could get lowered mpg or other things. Now my problem is I don't see the electrical plug to connect to the sensor. Only the mechanical plug is connected. Anyone know of a diagram of the electrical for this sensor.

91 4 cyl yj ax5

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Unread 07-12-2013, 02:53 PM   #2
SeanB95YJ
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1995 YJ Wrangler 
 
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Location: Schenectady, New York
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been a LONG time since I've had a mechanical (cable driven) speedometer, but I believe your electronic VSS (that sends signal to the computer) is up behind the dash (possibly connected to the back of your speedo)
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Unread 07-12-2013, 03:48 PM   #3
mipstien
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It doesn't seem to be affecting anything really. I wouldn't really know because I've never seen it the other way.
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Unread 07-12-2013, 04:15 PM   #4
pete1991YJ
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1991 YJ Wrangler 
 
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Location: Niagara Falls, NY
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Quote:
Originally Posted by SeanB95YJ View Post
been a LONG time since I've had a mechanical (cable driven) speedometer, but I believe your electronic VSS (that sends signal to the computer) is up behind the dash (possibly connected to the back of your speedo)
Actually this is not true. On my 1991 YJ 4-cylinder, the VSS is on the rear housing of the T-case, it has both a speedo cable and an electrical connector. The electrical connector eventually goes to the computer up on the firewall.

If yours does not have this kind of VSS then somebody definitely installed the wrong thing. The 1991 was the only year that had the VSS built into the speedo sender housing.

Unfortunately my Haynes manual doesn't show anything specifically for the 2.5, only the 4.0. It does show a VSS for the 1997 and later, but thats the purely electronic speedo (after 1992 IIRC)
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Unread 07-12-2013, 04:33 PM   #5
mipstien
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1991 YJ Wrangler 
 
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Location: Walland/Knoxville, Tennessee
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I think the cable might be cut. I'm just trying to trace it to fix it possibly.
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Unread 07-12-2013, 06:50 PM   #6
pete1991YJ
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1991 YJ Wrangler 
 
Join Date: Mar 2012
Location: Niagara Falls, NY
Posts: 1,636
Haynes shows white/org wire, violet/org wire, and br/yl wire for the sensor. Dunno for sure if its correct for the 2.5 tho, but its all I got so far. Some where around here I have the pinout diagram for the ECU, that would show it for sure but I gotta find it. It was posted here years Ago.
EDIT found it here ya go, the only diff betwen the 2.5 and the 4.0 ECU is the extra injectors wiring, otherwise the pinouts are the same... The VSS should get a =5 volt supply on pin 1 at the sensor, 2 is ground and 3 is the signal that goes in this diagram...
ecupinout.jpg

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Last edited by pete1991YJ; 07-12-2013 at 06:58 PM.. Reason: details for pic
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