ECU readout

[cbass]

I heard from some people on another site that Land Rover ECU's have a digital readout of the trouble codes that are stored in memory. Does anybody know if a 94 D90 has this on the ECU? The check engine light came on, and we really don't want to pay the "stealer" to fix it if we don't have to. ANy info is appreciated!

Also,
Is the ECU different from the Electronic Fuel Injection module that sits in the passenger side footwell (LHD)?

TIA!

[Mike Hippert]

YEP the 94s have it. It is to the right of the ECM or Electronic Fuel Injection module in the passenger side footwel .

[Doug]

The lead on my 110 was long enough, so I took the fault code read out box to the outside, and velcro'd it to the fuse box. Now I can see fault codes the minute one turns up. ;) Last one I had was an 88, giggled the wires a bit on the purge valve, and it went away on restart. Makes you want to go through every damn connnector in the engine bay....

DW

[rover4x4]

If its on a 95 and 97 its in the passenger side seat box

[cbass]

OK guys, wow those were some quick responses.

We have the A/C installed in there, and it was covering up the box. But, I still think I am missing something. I found the little black readout box, but there is no readout on it that I can see anywhere. Do you have to open it up? or what? I am sure it is the readout box because it says so on it. I just can't figure out how to get the dang thing opened.

TIA!

[Mike Hippert]

hmm, when my AC was in there was a little cover right next to the door that is held on by 2 screws, the box is tinted red.

[cbass]

Yeah, that sounds like the one, really dark red. Anyway, Let me give you guys the whole story.

So, about a week ago, the dealer cleared the check engine light and told us the problem was with the O2 sensor. The dealer wanted too much for the sensor, so we bought one ourselves and were going to replace it, then we realized we didn't know which side was the bad one. We couldn't check by trial and error because the check engine light is off now (and has stayed off...???). We don't want to buy another O2 sensor if we don't have to, but we don't know which side to put this one in.

Now, I just went out and checked the readout and nothing showed up. (I tried it with the car on/engine off, then I looked again with the engine on) Does it show up pretty bright on there when one does come up? When they cleared the check engine light, I assume they purged the ECU memory also, hence no DTC on the readout, am I right? Anyway, thanks for the help!! I have to say this is one of the best forums, you guys are quick!!

[Mike Hippert]

You can see it very clearly through the side of the box. There are 2 numbers and they show up red. If you can follow the cable back to the ECM, it should have a connector on it in line to the ECM, they may not have connected it back up all the way at the dealer when they reset the ECM. By the way, you can reset it by disconnecting the battery, or by the method in the FAQ section. Also you should be able to take it to Auto zone and they can hook up there reader to it and they will let you know whats wrong for free, and reset the ECM.

[cbass]

Ok, here's some pics of what I found.


So where do the numbers display? On pic #3 is the readout above the little white sticker?

Thanks! I'll do some checking on the leads to the ECU.

[Mike Hippert]

Yep thats it, and yes on pic #3 right above the sticker.

Some Fault code stuff

http://www.d-90.com/faq/Engine/EngFault.html#Codes

http://www.rangie.com/articles_topic.php?id=167&cat=6&subCat=26

[Doug]

If you disconnect the battery and then turn on ignition, you should be able to see a fault code '02', which just means the power was cut to the ecu recently. It'll go away on second restart. That's just if you want to 'see' the lit display...

[dante18]

CBass, have someone turn the ignition key as you are looking at the display. Sometimes the code comes on for a second as you turn the key, at least on mine anyway?

[cbass]

OK, thanks guys. I tried what Dante 18 said so far, and the screen flashed, so at least I know it's working and getting power. I guess all the codes were cleared by the dealer. I have yet to try what Doug suggested, maybe I will today. Anyway, for now I am just going to flip a coin and put the O2 sensor in one side for now, and if I see any codes, I'll buy another one. Thanks for all the help guys!!

[cbass]

If there are multiple codes in there, what happens?

It seems like I read somewhere that you have to clear the first one to be able to see subsequent ones, is that correct? If there are multiple ones, will it just cycle through all of them, one after another?

I'm getting a 45 right now which is a Right side O2 sensor. What I am wondering is if maybe the other o2 sensors are bad too and they just aren't showing up on the ECU readout, could that be? I would rather just make one order for the O2 sensors rather than have to make another order later.

TIA

[Mike Hippert]

http://www.d-90.com/faq/Engine/EngFault.html#Codes

Scroll down a little in this link :)

[cbass]

Perfect Mike! Once again, the D-90 guru has spoken... and solved another problem!!

Thanks!