Question about 1999 Cadillac DeVille
I read that you can access diagnostics mode in this vehicle by depressing the off and warmer buttons on the heater control panel! Supposedly if you wait for the self checks to run the "pcm?" funtion comes up and you can select it with the high button and then scroll through data,override and clear codes. When I select the pcm? with the high button it goes streight to clear codes, I dont get data or override to show up. Am I doing something wrong or is there a problem with the pcm diagnostics?
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Posted on Jan 02, 2017
This is defenetly the BCM, I had a 1990 with all of the same problems. Buy a rebuilt and install it behind the clove box. Remember that you must install you memory prom into the new unit as they don't come with any in them (it is what is memorizing your miles driven.) You will get off pretty easy on this one as they are available and not too expensive.
Posted on Jan 29, 2009
PO135 is oxygen sensor Bank1 sensor1. PO404 is EGR.
personally, I'd pull EGR off, clean pintle good with throttle body cleaner or carb cleaner, re-install, erase codes & try it for a while & see if it code(s) come back.
Posted on May 07, 2009
When the car has the crank/no start, at that point see which is missing. Test for fuel and spark. I think it has to do with fuel, a tired fuel pump or relay. But remember to check the oil sending unit. If it fails it will shut down the fuel system.
Posted on Jun 18, 2009
On the inside trim, you can remove screws that are by the door handle, arm rest, under door and side of door and then gently pull back on the panel as there will also be retaining clips attached and you don't want to break them. You'll need to lift the door panel upwards in order to get it off the window ledge. Then you'll need to manipulate the panel and disconnect the door handle linkage from the door handle and disconnect the wiring for your controls. Then pull back the weather seal...
Posted on Oct 21, 2009
Anytime I get a too lean DTC I first change the fuel filter if it hasn't been changed in awhile. You'd be surprised how many times this has helped.
Good Luck with it.
Posted on Oct 22, 2009
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