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This fuse has nothing to do with the battery .
PCM BATT Fuse 10A Powertrain Control Module (PCM), Theft Deterrent Module. That just means it's B+ voltage feed for the PCM an theft module . IT actually supply's B+ voltage too two different feed's for the PCM . Connector 1 terminals 20 & 21 . You have a dead short to ground on one of those feeds or your PCM or theft control module is shorted . If you don't know automotive electrical , I suggest very strongly you take to someone who is !
Cadillac Northstar owners to those whose vehicle is overheating .My 99 Deville was overheating turns out it was Catalytic Converter.Dont rely on PCM for code.If the Cat converter gets plugged up the heat will not get past converter it will back up into engine block causing overheating.My deville ran at between 190 & 201 degrees this morning.If you have a misfire the unburnt fuel goes into Converter and causes damage to converter (blockage).Alot of people overlook converter when overheating happens.
PCM is the Powertrain Control Module. If you use the fan down button it will scroll through the different systems ACP ICP TCS etc. The PCM is the one you want to worry about though. Pushing the fan up button will select the pcm. Then it will give you options from there. The PCM controls ignition, shifting points, and a whole bunch of other related things.
Turn the key on. Hold off and warmer on the climate control until all the lights light up. It will now read out all the codes in all the computers. Let it go until it reads (PCM?). Now push up on the blower speed. It will read PCM DATA. Now push down (I think 3 times) until it reads CLEAR CODES. Now push up on the blower speed. It should read PCM CODES CLEARED. Now turn the key off.
random misfire does the engine have lack of power or a miss... sounds like maybe bad coil pack......wire.....or plug do good tune up see what happens let me know if more help needed
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