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Problem ongoing for about a year and ½ and only after heavy rain. Not throwing codes, all dash lights and security check work like they are supposed to. Covering the hood during rain seems to prevent the problem.(I have some minor front end damage that may be allowing rain to enter where it shouldn't). One of my low beam headlights doesn't work, so I've been just using the high beams...Hi-Def bulbs are $$$ and that is what the shop recommended). The only other light that's out is the right side license plate light.
Tired of shops wanting to throw parts at it when they can't figure it out, nor can I afford to, so picked up a test light, a DMM, signed up for Alldatadiy, and started keeping good notes and have been researching this myself. Trying to keep this short, but have a lot of info that I could share if needed. I have replaced the battery and the cap and rotor recently, but problem continues.
I''ve focused on checking fuses when this happens, but most sites aren't clear/specific on what the readings mean & I haven't focused on relays yet.
The next time it wouldn't st art after rain I checked fuses in the engine fuse block with the test light to negative on battery and noticed these didn't lite it, until it dried out & started....then they did light it..
TRL TRN, TRR TRN, TRL B/U, VEH B/U, ECM1, ENG1, B/U LP, OXYSEN, and IGN E (not sure about BTSI fuse – missed that).
(It began starting again before I could check the Body fuse block in side of dash...Did check those when it was starting and all were fine).
The only fuse I've ever had to change was the one for the cigarette lighter/Obd2 port, but that hasn't gone out since replaced about 4 mths ago.
I notice that the schematic on Alldata shows the ECM1, ENG1, B/U LP and IGNE all in the bottom row on the "IGN RUN & Start BUS BAR Schematic. These fuses all show nothing on my DMM when it won't start, but battery voltage when it drys and starts. From what I've read, these will prevent spark at the coil, and I think the fuel pump too. Is there something I could check that would affect all of these fuses? I don't think it's the security, since the light on dash does as it should.
Thanks for any help I can get!
