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Old 08-21-2011, 09:11 AM   #1
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PCM/Ignition fuse

I have a 94 Z28, LT1, for awhile it was blowing PCM/Ignition fuse then it would just stop and car would start. I haven't driven the car any distance yet because tow bills aren't cheap, car ran in my drive way for awhile without blowing the fuse. I also have another issue now, the ses light comes on with the cooling fans and the fans will not shut off. Can someone please help me I want my car back on the street!
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Old 08-21-2011, 09:29 AM   #2
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Re: PCM/Ignition fuse

You have to look at all the devices that are connected to the "PCM IGN" fuse. One of them (or the wiring to it) has a short. According to my 94 Owner's Manual, Fuse 5 "PCM IGN" connects to the PCM, the fuel pump relay and the PASS-Key module. Check you Owner's Manual, but it should be the same for the Camaro and Firebird. If you don't have an Owner's Manual, Shoebox has a link to copies on line:


There are several codes that, when set, cause the PCM to run the fans full-time. You have to scan it for codes and correct the problem to turn the SES light and the fans off. The most common problem is DTC 29 for a blown fuse for the AIR pump. Check fuse 7 in the under hood box. If it's not that, get it scanned.

94 Formula A3+1: 381ci all-forged stroker - Callies Stealth, Oliver 5.85 billet rods, BME nitrous pistons / CNC LT4 heads / Comp Cams custom solid roller / TH400 + GearVendors OD / Strange 12-bolt - 4.11's / 300-shot N2O / Spohn suspension / 6-pt roll bar with integrated SFC's / AutoMeter instrumentation / MoTeC M48Pro engine management system / a few other odds 'n ends. 800HP/800LB-FT at the flywheel.
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Old 08-21-2011, 03:17 PM   #3
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Re: PCM/Ignition fuse

Thanks I will check those things out, my problem is finding a obd1 scan tool...
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Old 08-21-2011, 03:17 PM
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