Engine light and pulling fuse

[4dmalamute]

I have tried to clear my check engine light twice over this past week and it wont clear. I know what the code is and how to fix it (bad ECU and O2 sensor, BUT I have the newer model ECU installed already ) Anyway, I just wanted to see if the light would go off, even for a minute, but nothing. Even when I pull the main EFI fuse, disconnect the battery, even pulled all the little ecu fuses........still, the light wont even turn off. I know its going to throw the code atleast till I get the new O2 sensors in (ordered them up today from CDan as he was walking out the door;p ) but the point is, I just want to find out why the light wont even turn off........any ideas?

 

[SOCALFJ]

Pull the bulb

 

[MLX450]

How long did you wait before putting the fuse/battery cable back on? Give it a minute or two before you put it back.

 

[Beowulf]

Your post is not clear to me.

If you have a "bad ECM" code (not sure what that is...) then it seems logical to me that no matter what you do, you will trigger the MIL because, by definition, you have a bad ECM and it MUST trip the light immediately upon deciding that it is bad during it's self-test.

Am I making sense?

If you put another ECM in it and the replacement is also tripping the "bad ECM" code then you have a wiring problem or the replacement is bad too. The code is both stored in the ECM and generated by the ECM.

HTH.

-B-

 

[informationjunky]

How long did you wait before putting the fuse/battery cable back on? Give it a minute or two before you put it back.

Yep, certain time for it to clear.

 

[4dmalamute]

Yep, certain time for it to clear.

The first time I waited 5 minutes. Then, the second time, I actually waited an hour due to getting side tracked! Still, the light never went off.

 

[4dmalamute]

Your post is not clear to me.

If you have a "bad ECM" code (not sure what that is...) then it seems logical to me that no matter what you do, you will trigger the MIL because, by definition, you have a bad ECM and it MUST trip the light immediately upon deciding that it is bad during it's self-test.

Am I making sense?

If you put another ECM in it and the replacement is also tripping the "bad ECM" code then you have a wiring problem or the replacement is bad too. The code is both stored in the ECM and generated by the ECM.

HTH.

-B-

Your making total sense. The issue is, with the early production 1993 FZJ80, there was an issue with the ECU. For some reason it would give a trip, thus creating a check engine light. The codes pulled say your ECU is crap basically. Here is my issue though, I have the newer (I forget the actually product number at this point) which is normally good. I havent heard of anyone yet getting the codes (82, 83, 84 or something like that ) with the newer style.

I know the check engine light will keep coming back, which is good. The thing is, no matter what I do, the light wont go off, not even for 2 seconds. Makes me wonder if there is another issue going on.............short???

 

[NorCalDoug]

odd.

battery or EFI main should do the trick.

if you want to meet me in Sacto (either Hwy 50 or I80 corridors), let me know -- I have a ODB II reader -- I should be able to clear the code with it...unless you have something malfunctioning with your ODB II system...

 

[Beowulf]

What codes are you getting right now with the replacement ECM? All of them please.

Doug... he has a 1993 which is pre-OBD-II. Paper clip for him.

-B-

 

[4dmalamute]

odd.

battery or EFI main should do the trick.

if you want to meet me in Sacto (either Hwy 50 or I80 corridors), let me know -- I have a ODB II reader -- I should be able to clear the code with it...unless you have something malfunctioning with your ODB II system...

Thanks Doug for the offer but my beast is a 1993........the old style, not ODBII.

 

[KliersLC]

odd.

battery or EFI main should do the trick.

if you want to meet me in Sacto (either Hwy 50 or I80 corridors), let me know -- I have a ODB II reader -- I should be able to clear the code with it...unless you have something malfunctioning with your ODB II system...

I think he has a 93......

Damn, beat by two people on the draw.....my kung fu is weak......

 

[4dmalamute]

What codes are you getting right now with the replacement ECM? All of them please.

Doug... he has a 1993 which is pre-OBD-II. Paper clip for him.

-B-

The codes I am getting from the check engine light are as follows;
28...which I have memorized...#2 O2
83
84
85

Gosh, this list doesnt even include the two I get from the ABS nor the one I am getting with the cruise control light. My poor beast is screaming for me to give it some love

 

[NorCalDoug]

What codes are you getting right now with the replacement ECM? All of them please.

Doug... he has a 1993 which is pre-OBD-II. Paper clip for him.

-B-

Thanks Doug for the offer but my beast is a 1993........the old style, not ODBII.

I think he has a 93......

Damn, beat by two people on the draw.....my kung fu is weak......

:whoops:

so much for my attention to detail skills today...








dude...yer rig is toast. time to get a new one...

 

[4dmalamute]

:whoops:

so much for my attention to detail skills today...








dude...yer rig is toast. time to get a new one...

Hmmmmmmmmmmm, I did want another auto. That TDI I was looking at could be in the workings then.


YA RIGHT!! My wife is anti any other car and my beast is a champ (even if she doesnt run, she looks cool!)

 

[Beowulf]

so much for my attention to detail skills today...

Shouldn't you be on your way to Cruise Moab by now?

-B-