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Q: Can the pcm fuse keep the jeep from starting? on 1998 Jeep Cherokee

The horn stopped working, checked the fuse box, seen one fuse that was blown and replaced it. Now I had no owner's manual or any reference to go by for checking the fuses. So I just pulled one out at a time and checked them. After not fixing the one problem I had, a second problem came up. The jeep will not start. I tried too many times to get it to start. You can turn the key and all it will do is crank. I took it to a garage over 2 months ago. The mechanic sent me a pic of the fuse box and showed me what he thought was the issue. I know nothing about jeeps other then keeping gas in it and doing regular oil changes. If it is not clear by now I am a female.
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PCM= powertrain control module-- it powers the computer that allows it to run, so , yes would be the likely answer.
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