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02-21-2007, 12:17 PM | #1 |
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CEL Fix = No Illumination settings in the 04 STi ?
I recently had my 2004 STi tuned, and one of the things we did was remove the P420 CEL from appearing on the dash. 200 miles later, that seems to have worked as that code has still not reared it's ugly head. However, I cannot change the illumination settings in the dash (brightness/dimness). I'm guessing that's a side effect? I guess I should go the spark plug anti fouler route eh?
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02-21-2007, 12:29 PM | #2 |
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*TOTALLY* unrelated.
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02-21-2007, 02:03 PM | #3 |
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Really? Why do you say that? I only suspected the tuning change because that's the only thing that has changed on my car in the last week or so. A few weeks back I had a sound system installed, but I'm 95% certain I could change my illumination settings after that. The reason I noticed this issue is because the dash is now dimmer than I normally had it (I used to have it on the highest illumination). Thoughts?
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02-21-2007, 02:10 PM | #4 |
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Do you really think a denso ECU cares about your dash illumination controls? If so, grab the wiring diagram and show me the inputs and outputs to the ECU to change the lighting on the dash.
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02-21-2007, 03:17 PM | #5 | |
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02-21-2007, 08:13 PM | #6 | |
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Anyhew, since the CEL is lit by a bus message, it is certainly possible that a part of this message inhibits dimming and is not "blocked" by the CEL fix. If you really wanted to check, you could reset the ECU and see if dash light control comes back. Alternatively, just flash back to stock and see if dash control comes back... |
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02-21-2007, 08:16 PM | #7 |
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Of course, if I actually read your whole post, I'd have noticed that you're dash is now dimmer than before, which is the opposite condition to what we saw... In that case, (and because I've not heard of anyone else ever complaining of a similar problem) I'd say the interaction is unlikely...
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02-21-2007, 09:15 PM | #8 | |
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Now if the tuner did something to disable the CEL outside of the ECU.... Who the hell knows. Edit: Well, if the ECU is sending a trouble code command packet out onto the bus with some missing information, then that would be a bug in the cell fix itself. AFIK, the fixes are for specific trouble codes. That would lead me to believe that a packet is never sent out to trigger a trouble code CEL. One would think that if you disable a trouble code in the ECU rom, then the ecu would never invoke the function to turn on the CEL. Last edited by gabedude; 02-21-2007 at 10:09 PM. Reason: More thought |
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02-21-2007, 10:16 PM | #9 |
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Ahh, didn't realise the WRX still used old-school hardwired CEL. I think the last product i worked with that did that was like 1996 or so...
Newer (apparently non-subaru) crap that uses CAN or other bussed communications between the ECU and cluster can have the funky interactions of which I spoke. We basically ran two embedded bus messages, one for the CEL and one to inhibit cluster dimming, so I was thinking the CEL fix could inhibit one of the bussed messages but not the other. Siunce you're looking at a single hardwired input/output, it's either there or it's not (no interaction). In the end, my entire comments have no bearing on the OP's problem.. Whoops. gabedude's subaru knowledge > my subaru kowledge So yeah, OP probably has something bunged up on the dimmer wiring... |
02-22-2007, 10:07 AM | #10 |
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I really don't know if its just a pin or sent out on a bus signal (That was an ASSumption. I would have to look at the ECU pinout). What I do know is that the trouble code fixes are in the ECU rom. The ECU chip uses this table to invoke the CEL function. There is not a global inhibit CEL light fix. If there was, then what you said would make sense.
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02-22-2007, 02:59 PM | #11 |
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No need to be rude... never did I state that I unequivocally knew what the ECU did or did not control, hence the question. Thanks for being a jackass though.
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02-22-2007, 03:02 PM | #12 | |
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02-23-2007, 11:38 AM | #13 | |
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