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4 Wheel Drive/SUVs/94 Wrangler Seirra Edition

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Expert: - 1/10/2006


Question
My jeep will crank over (starter engages) but is getting intermittent electrical signal to the coil.  I have changed the coil, cleaned all ground connections, checked the coil wires (leads) for shorts, and replaced cap, rotor and wires.  Running a self diagnostic I get a 11(ignition) and 12 code.  My Haynes manual does not show a 12 code for a 94 model wrangler but for a 97 and later models a 12 code is "Battery Power to PCM was disconnected".  Could this be the same code for a 94 model or do you know what a 12 code is?  Do you have any idea of what else could be the problem?  Additional info...when the jeep starts, it runs greats and has never stalled out while driving.  I am at a loss, can you help?

Answer
Darren,

According to my book, an error code 12 states "Problem with the battery connection.  Direct battery input to controller disconnected within the last 50 ignition key-ons."

Check all battery connections, and (especially) all ground wires and connections.

Without working on it myself, these are the best suggestions that I can give you at this time.

If this doesn't work, you may have to take the Jeep to a reputable shop, and have them run a diagnostic analysis.

Carl

4 Wheel Drive/SUVs

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Carl Brandt

Expertise

Will discuss suspensions, lifts, lockers along with tire suggestions. Trail ratings and possible requirements needed for specific type of trails. Safety equipment and what you should carry with you. Certified off-road instructor. I am not a mechanic, and 4-Wheeling is a hobby, so if I can't answer a technical question it is due to my mechanical knowledge being related to vehicles that I have owned, or have worked on. I do not have manuals on all vehicles.

Experience

40 plus years of 4 wheeling in a variety of vehicles. At the present time, my major off-road rig is a 94 Jeep Wrangler with a spring over and a 1 1/2" suspension lift. This gives me a total lift of 7" or so. I have lockers front and rear. I have removed the track bars, and sway bar for maximum articulation. I am running a stock 2.5 ltr 4 cylinder with a Jacobs ignition along with a cold air high flow filter. It has 4.56:1 gears with a Dodge NV4500 transmission along with a 3.8:1 Atlas II transfer case. This gives me a final ratio of 105:1 in low gear/low range. Other vehicles I own, are a 96 Ford F-250 with a 6" lift, posi rear end, 36" Hummer tires, 5 speed with a fuel injected 460 ci engine, an 87 Samurai with an 8" lift, Ford 9" rear end with a spool, Chevy Dana 44 front end with an electric locker, 5.88 gears, 16% reduction in high range and a 6.5:1 low range with 35" Baja Claws, and a stock 2003 Grand Cherokee Overland. Trails I have run are the Rubicon (10 times), Dusey Ershim, Fordyce Creek trail, McGrew trail, several trails in Moab, Utah along with local monthly runs.

Organizations
Lost Coast 4x4's Cal 4-Wheel Corva UFWDA Blue Ribbon Coalition

Education/Credentials
Certified off-road instructor - Certificates in engineering/electronics

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