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02 Grand Cherokee 4.7 engine with no comm and antitheft light on

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6 years 5 months ago #15564 by chris.arriazola
02 Grand Cherokee 4.7 engine with no comm and antitheft light on was created by chris.arriazola
Hello I’m having trouble understanding how this system works. I have a crank but no start on this 2002 grand Cherokee with 4.7 engine noticed the antitheft light is on and I have a no comm on PCM. I’m trying to understand if I need to attack the PCM problem first because it might have something to do with the theft system. I have already checked both my 5v reference circuits and they seem to be fine. My ASD relay is not being commanded to give power to my coils. Would like a little help if possible

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6 years 5 months ago #15572 by Ben
Replied by Ben on topic Re:02 Grand Cherokee 4.7 engine with no comm and antitheft light on
Can you communicate with other modules? Do the 12v power points/cigar lighters work?

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6 years 5 months ago #15574 by chris.arriazola
Replied by chris.arriazola on topic Re:02 Grand Cherokee 4.7 engine with no comm and antitheft light on
Yes I have communication with everything else but the PCM

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6 years 5 months ago #15575 by chris.arriazola
Replied by chris.arriazola on topic Re:02 Grand Cherokee 4.7 engine with no comm and antitheft light on
Yes I have power supply and communication with everything else

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6 years 5 months ago #15579 by Chad
Replied by Chad on topic Re:02 Grand Cherokee 4.7 engine with no comm and antitheft light on
With the key on, do you have battery voltage on FUSE 12 (10 amp) -Junction Block behind left side of dash ?

AND

Fuse 6 (30 amp) -Power Distribution Center At right, front corner of eng compartment, next to battery?
"Knowledge is a weapon. Arm yourself, well, before going to do battle."
"Understanding a question is half an answer."
I have learned more by being wrong, than I have by being right. :-)

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6 years 5 months ago #15588 by chris.arriazola
Replied by chris.arriazola on topic Re:02 Grand Cherokee 4.7 engine with no comm and antitheft light on
Let me check on these fuses to make sure I’m not overlooking something

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