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2000 cherokee classic no bus p1694

Old 04-24-2019, 09:04 PM
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Default 2000 cherokee classic no bus p1694

new to the forum but have been reading here for awhile. i was going to start a build thread when I ran into this issue and started one here instead. just picked this jeep up a month ago. did the floor pans and a few other things. jeep ran great on my way out of town my oil pressure spiked to 80 on the cluster a few seconds and went back to just over 45 . I didn't notice any other gauges. ran fine until one morning I went to start. it ran maybe 5 seconds and stalled, would turn over but never start. then I got the no bus on dash and a p1694 code. i pulled the cluster to see cel light and other dash lights removed imagine that. jeep ran very good though cleaned cluster checked resistance on cps was good . checked ohms between pcm and tcm good. no power to fuel pump with key turned. I have to jump relay to work, also no power to 15amp fuse pcm or fuel injectors. anyone have any ideas? would appreciate it.

Last edited by richrm; 04-26-2019 at 06:48 AM.
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Old 04-24-2019, 11:55 PM
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Can't...... read..... run... on..... sentences......
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Old 04-25-2019, 05:04 AM
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Check the condition of the main power feed wire from the battery cable clamp to the PDC. Any corrosion inside the cable clamp with cause a voltage drop and the PCM doesn't like that.
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Old 04-25-2019, 08:46 AM
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thanks. I will check that today. I did take a test light to all the grounds and battery terminals but I will take them apart
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Old 04-25-2019, 08:57 AM
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sorry for the sentence structure. I was in a hurry last night. I will be careful with punctuations next time.
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Old 04-25-2019, 01:17 PM
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cleaned and check terminals and nothing has changed.
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Old 04-25-2019, 03:28 PM
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I checked pcm to cps and only getting .580 volts. would the pcm be bad or is there somewhere else to check first?
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Old 04-28-2019, 07:02 AM
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just an update if anyone has any suggestions . I have unplugged all 5v sensors. tested ignition and have 12v coming out, but 2 15 amp fuses 18 fuel rail and 21 pcm. checked powe at pdc I have 12 volts going to fuel pump and asds. the relays are good . the relays however do not click or open. check for volts going into pcm on the b positive pin and have 12v , but only have .6v coming out of 5v pin a17. in the jb I had a blown fuse number10. says starting system. I replaced it but im not sure what caused that fuse to short.
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