pcm wiring discrepancy - JeepForum.com
 
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post #1 of 4 Old 07-05-2006, 04:48 PM Thread Starter
impossiblethat
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pcm wiring discrepancy

1996 grand cherokee laredo, 4.0 motor, turns over, no spark or fuel. after much probing of injectors, sensors and noticing check engine light no longer comes on (substituted known good bulb already) am leaning toward faulty pcm. using mitchell on demand to check pcm grounds and volt supply, noticed mitchell says terminal A14 (black connector) should have 12volts from 40amp fuse #15. said fuse is good but terminal A14 on pcm harness is blank, obviously that way from factory. question is is mitchell wrong about the terminal at pcm that receives voltage from fuse 15, or are terminals A2 and A22 the only sources of voltage? here's hoping someoneelse has a different brand of wiring diagrams or maybe a jeep chassis manual with wiring info.

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post #2 of 4 Old 07-05-2006, 06:56 PM
greasefingers
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Sorry about your issue. I checked my 1994 FSM but I can tell that it must be completely different. The reason probably is because that yours is OBD II and mine is OBD I. Good luck in your quest.

Cheers Steve

94 Black Laredo 4-Liter with QuadraTrac (42RE trans & NP249 TC) 200,000 + miles purchased new

88 Cherokee 2-door with 5speed manual 139K miles(deceased) purchased new
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post #3 of 4 Old 07-05-2006, 07:22 PM
jeep946
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Hope this helps

i just went through my FSM and found two power wires for the pcm. a-2 and a-22 .
a-2 is fuse 20 in the PDC and a-22 is fuse 18 in the PDC. also i see that a-22 will have power all the time and a-2 is only 12 volts with the key in the run and start positions. hope that helps some.
Barry

94 Grand Cherokee, 4.6 stroker, 7 inch custom long arm kit, 33x12.50x15 Firestone destinations m/ts, flow-master 40 series, magnaflow high flow cat, locked front and rear, super axle kits front and rear, pioneer head unit, CB on channel 10, and a B&M built transmission, switched from a 231 to a 242, 2000 Grand Cherokee steering and knuckles and brakes, no abs, wildwood adjustable proportioning valve, and lots more
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post #4 of 4 Old 07-06-2006, 07:10 AM Thread Starter
impossiblethat
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thanks to both responders. from barry's fsm i deduce that mitchell is wrong about a14 and that a2 and a22 are only voltage sources for pcm.
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