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Help us help you. By posting the year, make, model and engine near the beginning of your help request, followed by the symptoms (no start, high idle, misfire etc.) Along with any prevalent Diagnostic Trouble Codes, aka DTCs, other forum members will be able to help you get to a solution more quickly and easily!

00 Mazda 626 2.5

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4 years 1 month ago #50812 by Wburke1
00 Mazda 626 2.5 was created by Wburke1
00 Mazda 626. 2.5 L P1633 code. Any tips related to this issue. Tested alternator. Came out good. Wiring all looks ok. 

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4 years 1 month ago #50814 by jreardon
Replied by jreardon on topic 00 Mazda 626 2.5
imgur.com/a/2TvlHsa

Check the ROOM fuse (hot at all times) in the Joint Box under the driver's side of instrument panel. Load test it with a headlight bulb. If it's bright there, then check it at the computer (Blue with Red tracer). The key can be off, you can back probe or front probe it, and make sure the terminals look good and tight.

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4 years 1 month ago - 4 years 1 month ago #50815 by jreardon
Replied by jreardon on topic 00 Mazda 626 2.5
Maybe I'm looking at the wrong DTC. Why are you checking the alternator?

Ohhh nevermind, you're chasing low voltage so duh, that makes sense. Sorry.
Last edit: 4 years 1 month ago by jreardon.

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4 years 1 month ago #50940 by Wburke1
Replied by Wburke1 on topic 00 Mazda 626 2.5
Joint box-Fuse panel? Pic of a room fuse?

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4 years 1 month ago #50946 by Wburke1
Replied by Wburke1 on topic 00 Mazda 626 2.5
I found the room fuse. Will load test the wires. Let you know what is found. I removed the Computer in the meantime. Found what looks like corrosion inside. But I will continue testing before ruling out computer. I have a test computer to try in it also.

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