Need info on 91+ XJ electronic speedo sensor...

Vetteboy · 07-02-2004, 03:50 PM

Last weekend's wheelin trip, my speedo cut out halfway through the day. Driving home that night I got that stupid red 'check engine light' which threw a code for a missing/malfunctioning speedo sensor. Not surprising since it still wasn't working.

So yesterday I pull it apart, look at it, go hmmm...then put it back together again, same notches and everything. Worked fine for the day. For some reason now, it still indicates speed, but will jump higher at times. This obviously isn't a mechanical failure because this would mean the speedo gear was spinning faster than the output shaft = not possible.

So does anyone know what the pin configuration would be? My guess right now is that it works off a sort of frequency counter (a binary signal sent to the computer, which counts it and turns it into a speed reading) and something is grounding out and causing it to get a bad signal.

[img]graemlins/iono.gif[/img]

Anyone else have an idea? The junkyard by me currently has no XJ's with an electric speedo, so I'm beat as far as just pulling a new sensor.

XJ Fanatic · 07-03-2004, 08:07 AM

lol, you are a fawkin dork. so i think oba maybe done by the end of the week, it will be just straight for tires till i get more money to buy a tank [img]icon_smile_wink.gif[/img]

Vetteboy · 07-03-2004, 10:33 AM

Get a surplus oxygen tank off Ebay for like 15 bux. They're real cheap because they're older than the rated lifespan so they won't certify the pressure rating anymore - but they're also rated for like 1500 psi. You can put 120 psi in them with no problem at all.

No help on the speedo sensor? Anyone? [img]sad_anim.gif[/img]

07-02-2004, 03:50 PM	#1
Vetteboy glamour turquoise Join Date: May 2003 Location: Red Bank, NJ Posts: 16,704	Last weekend's wheelin trip, my speedo cut out halfway through the day. Driving home that night I got that stupid red 'check engine light' which threw a code for a missing/malfunctioning speedo sensor. Not surprising since it still wasn't working. So yesterday I pull it apart, look at it, go hmmm...then put it back together again, same notches and everything. Worked fine for the day. For some reason now, it still indicates speed, but will jump higher at times. This obviously isn't a mechanical failure because this would mean the speedo gear was spinning faster than the output shaft = not possible. So does anyone know what the pin configuration would be? My guess right now is that it works off a sort of frequency counter (a binary signal sent to the computer, which counts it and turns it into a speed reading) and something is grounding out and causing it to get a bad signal. [img]graemlins/iono.gif[/img] Anyone else have an idea? The junkyard by me currently has no XJ's with an electric speedo, so I'm beat as far as just pulling a new sensor. __________________ trail rig: '94 XJ, 14FF, D60, Nv4500, D300, NP231 doubler box, 38.5 Creepies, chopped, caged, MJ'd. Wheeling. DD/tow: '05 Dodge 2500 CTD 6-speed. Wheelin '09...time to have fun. Hammers: x Rausch Creek: xxxxxxxx Uhwarrie 4x4cross: x Line Mountain Miler: x Big Dogs: x RCRocs race: x (= dead xj) Wheelin '10...time to go faster.

07-03-2004, 08:07 AM	#2
XJ Fanatic I wear a thong Join Date: Aug 2002 Location: Fort Irwin, CA Posts: 16,827	lol, you are a fawkin dork. so i think oba maybe done by the end of the week, it will be just straight for tires till i get more money to buy a tank [img]icon_smile_wink.gif[/img] __________________ 2002 WJ Overland, 4.7ho, quadradrive, all terrains, all 4 options available 31's The rubicon of the grands... Project Liquid Courage: 94 XJuggy, 44/8.8, 4.10 gears, minispooled f/r, hydro assist, 36" iroks, oba, leaves on all corners, aw4, 231sye'd, 4.0l... stroker and d300 in the works Proud to Serve, Proud to Defend, Proud to be an American Soldier

07-03-2004, 10:33 AM	#3
Vetteboy glamour turquoise Join Date: May 2003 Location: Red Bank, NJ Posts: 16,704	Get a surplus oxygen tank off Ebay for like 15 bux. They're real cheap because they're older than the rated lifespan so they won't certify the pressure rating anymore - but they're also rated for like 1500 psi. You can put 120 psi in them with no problem at all. No help on the speedo sensor? Anyone? [img]sad_anim.gif[/img] __________________ trail rig: '94 XJ, 14FF, D60, Nv4500, D300, NP231 doubler box, 38.5 Creepies, chopped, caged, MJ'd. Wheeling. DD/tow: '05 Dodge 2500 CTD 6-speed. Wheelin '09...time to have fun. Hammers: x Rausch Creek: xxxxxxxx Uhwarrie 4x4cross: x Line Mountain Miler: x Big Dogs: x RCRocs race: x (= dead xj) Wheelin '10...time to go faster.