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Old 02-19-2007, 07:01 PM   #1
cdmbrennan
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Default OBD reader can't/won't read codes?

Hey all,

CEL is on- I plugged in the OBDII reader but it won't even power up. I know it's not the OBD reader, so--- what could it be? Is there a fuse that powers the "reader" outlet? I didn't see as much in the manual.

Thanks!
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Old 02-19-2007, 07:18 PM   #2
lordkenyon
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Default Re: OBD reader can't/won't read codes?

Any of the pins bent? Wouldn't hurt to check all the fuses I suppose. Sorry can't be more help.
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Old 02-19-2007, 07:24 PM   #3
cdmbrennan
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Default Re: OBD reader can't/won't read codes?

None of the pins bent...I'll double check all the fuses and see if one isn't working.

Anyone else encountered this?
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Old 02-19-2007, 07:40 PM   #4
onefishman
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Default Re: OBD reader can't/won't read codes?

Yep.....got the same problem on a late 1996 D1.
Spent hours checking the OBD2 connector and traced out every single wire back from the connector. Checked for continuity, checked all connectors in between.
Gave up in the end, have been able to connect an OBD2 scanner.
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Old 02-19-2007, 07:50 PM   #5
lordkenyon
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Default Re: OBD reader can't/won't read codes?

It may take some digging (or it might be in RAVE Electrical diagrams), but the pin layout for the OBDII port is around here somewhere. If I recall there's a constant power port (mine powers on when no key present/OFF) and check if it's getting power (btw, this has to be fused somewhere).
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Old 02-20-2007, 12:31 AM   #6
lunchbox
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Default Re: OBD reader can't/won't read codes?

I had the same problem a while back. Ended up bypassing the power on the plug. I have the electrical diagram if you need it. Mine has worked fine since...odd? Shoot me an email, and I will see if I can shoot the diagram back to you.

Chad
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Old 02-20-2007, 09:35 AM   #7
Dan Erickson
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Default Re: OBD reader can't/won't read codes?

Is this on a D1 or D2?

I know on my D2, there are at least 4 different systems. Engine, gearbox, body control and ABS/SLS.

I am not so sure a normal OBD2 reader is going to read the faults with all these systems (some codes are Rover specific). For example, I have had the MIL light up for a gearbox fault. Using the Rovacom (I bought the 4 different modules listed above), I was not able to clear it with the Engine Management module (it would not read the fault). It was not until I scanned it with the Gearbox module, that I found it.

It may be that it is somthing that has to be scanned at the dealer with Testbook, or by someone with a rovacom or something like that.

Peace,

Dan
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Old 02-20-2007, 10:10 AM   #8
cdmbrennan
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Default Re: OBD reader can't/won't read codes?

Nah, no testbook necessary- just your all-standard check engine light. The OBD outlet is obviously not getting power as the reader won't even boot up, nevermind read/erase codes.

Of course, in true LR fashion my CEL went out last night (engine prob misfired a week ago and it just reset) but I'm sure the power issue is still there.

Chad- if you've got the diagram on how you bypassed the power I'd like to see it...cdmbrennan at yahoo. if it's not readily at hand no prob, not a huge issue right now.

Thanks all!!
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Old 02-20-2007, 10:21 AM   #9
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Default Re: OBD reader can't/won't read codes?

OOOps...missed the part about not even powering up.

Need to get my eyes checked or stop trying to speed read.

Sorry...
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Old 02-20-2007, 12:27 PM   #10
mspeters
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Default Re: OBD reader can't/won't read codes?

I have same problem on '97. Finally got my first ever CEL illumination.

An Auto X-ray unit shows a "connected" status, but is unable to read codes. It appears it is not seeing power when the ignition is turned-on based on teh error message. Problem is not the scanner. I have checked the connections at the socket-end.

Two questions:
1) Should I do the power bypass to the ODB socket ?
2) where does ODBII socket power originate from? computer or ignition switch or an infamous colored relays?
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Old 02-21-2007, 02:15 AM   #11
onefishman
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Default Re: OBD reader can't/won't read codes?

Pin 16 on the OBD2 connector carries voltage, wire colour is RW, wire goes to Satellite Fuse box B2, fuse F3, battery voltage is carried constantly.

Hope this helps
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Old 02-21-2007, 02:19 AM   #12
onefishman
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Default Re: OBD reader can't/won't read codes?

Fogot to say I have the circuit digram of the OBD2 connector, in PDF format, if anyone wants it.

Steve
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Old 02-21-2007, 12:11 PM   #13
cdmbrennan
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Thumbs up Re: OBD reader can't/won't read codes?

Quote:
Originally Posted by onefishman
Pin 16 on the OBD2 connector carries voltage, wire colour is RW, wire goes to Satellite Fuse box B2, fuse F3, battery voltage is carried constantly.

Hope this helps
That's helpful for sure- thanks!
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Old 02-21-2007, 06:35 PM   #14
Lutzgaterr
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Default Re: OBD reader can't/won't read codes?

Great idea about new power source. Mine has been dead for over a year but then again, I did not trace each wire very carefully. Hell, she runs fine regardless of that damn CEL illuminated. I do however need to resolve this since other issues will arise.
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Old 08-26-2013, 02:40 AM   #15
mogindo
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Default Re: OBD reader can't/won't read codes?

I have my powered up, but its stock on SCANNING and nothing happens after that.
Any clues?
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Old 08-26-2013, 02:28 PM   #16
neil30076
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Default Re: OBD reader can't/won't read codes?

If you pull the fuses ( or they are blown) to disable the ABS on a D1 the OBDII connector does not get voltage!
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Old 08-26-2013, 11:44 PM   #17
mogindo
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Default Re: OBD reader can't/won't read codes?

There is no reason for me to pull the fuses of disable the ABS, its my daily commuter.
But does Scanning imply that there is no power going to the scanner? Is it the same fuse as the ABS? My ABS is fine (tested it latelly.
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