Question about 1993 Jeep Grand Cherokee

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Engine stalls when driving on highway or in town . Disconnected battery terminals to reset computer . turn the key three times and read the engine check light flashes a two digit code 12 - 11 - 55 I know that code 12 means that the battery has been disconnected more than 50 time and code 55 means end of engine code transmission but... have not been able to under stand " no signal detected from the distributor then it states check the wire or connection between the PCM and distributor .... what is the PCM ? and what does it stand for ?????

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Pulse count modulator, there is a half circle of steel in the distributor, when the steel half circle passes a hall effect sensor ( pcm ) it tells the engine to fire on cylender number one. and the other half of the steel circle exits the hall effect sensor it tells it how fast it was turning. so all the other spark plugs fire at the correct time. The other part is that the pcm cystem is part of a coil that is wound around plates of steel if the plates of steel get wet (over time they tend to rust ) the rust swells the steel and the coil gets broken by the expanding rusty steel. so replace the coil portion of the distributor. just follow the singel wire to the block of steel ( coil is encased in rubber or molded plastic. ) but the coil is breaking or getting stretched and bearly touching and when it gets hot the metal expands too. and it fails. just follow the singel wire inside thedistributor to its coil : replace that and your good to go.

Posted on Feb 21, 2009

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Step 2. Insure ignition switch is OFF. Reconnect the battery 12v positive cable (red wire) to battery terminal (+).

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Hello. Welcome to FixYa. Please allow me to assist you.

What you have is this: Disconnecting the battery caused your car's computer to lose its 'base idle' parameters. This info is kept in the computer, but, removing power to the computer allows the info to be erased, so to speak.

This is, unfortunatly, a normal condition, and, easily rectified.

What you need to do: Get in the car, start it up, and drive it; simulating stop/start city traffic, and then take it out on the highway, hit passing gear a few times, pull off, and let it idle 30 seconds and repeat highway speed, and passing gear a few more times, then simulate city traffic again. You might need to apply a slight bit of gas during the idle periods of the drive. If you do it right, you can reset the base idle parameter under10 minutes.

If you have any questions, please feel free to get back to me via reposting.

Thanks for choosing FixYa for assistance today.

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Hi there biggryder 12!

The best way to reset the maintenence light after you have resolved the problem is to disconnect the battery.
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  2. Let the disconnected battery sit for at least 15 minutes
  3. After 15 minutes reconnect the negative cable
The reason to leave it disconnected for 15 minutes is to give the capasitors time to fully discharge their charge. If after doing this procedure and your light comes back on you need to check if there is any maintenence procedure that may have been missed or have the codes read.

I hope this was of assistance to you.

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