IPD sale XeMODeX - Experts in Volvo Electronics Free shipping all USA - Experts in Brakes
Did you know? 🤔
Logged in users can get email notification of topic replies Log in or register (free).
Amazon Link Buy your stuff using this and it helps MVS!

Ob2 port won't read codes, personal reader and store reader - 99 s70 na Topic is solved

Help, Advice and DIY Tutorials on Volvo's extremely popular car line -- Volvo's 1990s "bread and butter" cars -- powered by the ubiquitous and durable Volvo inline 5-cylinder engine.

1992 - 1997 850, 850 R, 850 T5-R, 850 T5, 850 GLT
1997 - 2000 S70, S70 AWD
1997 - 2000 V70, V70 AWD
1997 - 2000 V70-XC
1997 - 2004 C70

User avatar
smacknab
Posts: 129
Joined: Wed Sep 25, 2019 4:23 pm
Year and Model: 99 s70 NA Manual
Location: Boston
Has thanked: 37 times
Been thanked: 4 times
United States of America
smacknab

Ob2 port won't read codes, personal reader and store reader - 99 s70 na

Post by smacknab » Sat Dec 28, 2019 5:07 pm

I noticed recently that my obd2 wasn't scanning codes on my $20 dollar reader, but I figured my scanner was broken.

Today a Check Engine Light came up while driving and I pulled into an Advance to have them read the code and they said they weren't getting anything from the obd2 port. We tried a couple times and nothing was working so I figured nothing I can do right now.

Funny enough, when I started the car to drive home, the CEL was no longer on. So im not too sure how much I should worry about it.

Looking on the rest of the forums, I haven't seen anyone 'solve' this problem, other than suggestions to blow dust out of the obd2 port or check fuses. I also read that on a 97 s70, the obd2 is on the same fuse as the interior lights, but my lights are working. I suppose I'll check the fuses and blow some dust tomorrow, but if anyone else has a tip I'll look into that too!

Thanks!

Matty Moo
Posts: 1778
Joined: Sun Oct 12, 2008 9:38 pm
Year and Model: 850, 1996
Location: Ann Arbor, MI
Has thanked: 0
Been thanked: 12 times
United States of America
Matty Moo

Re: Ob2 port won't read codes, personal reader and store reader - 99 s70 na

Post by Matty Moo » Sun Dec 29, 2019 1:32 pm

From what I remember the cig lighter fuse powers the obd port.
Image
http://www.midwest-abs.com
Simplycleanpowerwash.com

1996 850 Platinum Wagon. ARD Green Tune, OBX.-Gone
1998 s70 ARD tune, EST exhaust, SE/R interior.
1999 s70 Plain Jane.
2000 s70 GLT
2014 Ram
2012 Jeep Wrangler Unlimited

User avatar
RickHaleParker
Posts: 3577
Joined: Mon May 25, 2015 2:30 pm
Year and Model: See Signature below.
Location: Kansas
Has thanked: 3 times
Been thanked: 434 times
United States of America
RickHaleParker

Re: Ob2 port won't read codes, personal reader and store reader - 99 s70 na

Post by RickHaleParker » Sun Dec 29, 2019 2:36 pm

Look for power on pin #16.
Pin #16 Fuses: 11C/5 & 11A/6.

Image
Platform: P80 1998 C70, B5234T3, 16T, AW50-42, Bosch Motronic 4.4, Special Edition package, Plant: Uddevalla Sweden.

Platform: X40 (Nedcar) 2003 S40, B4204T3, 14T twin scroll AW55-50/51SN, Siemens EMS 2000. Plant: Born Netherlands.

Platform P2 2005 XC90 T6 Executive, B6294T, 4T65 AWD, Bosch Motronic 7.0,
Plant Torslanda Sweden.
----------------------------------------------------------------
1997 S90, B6304S, AW30-42, Bosch Motronic 4.4 - Sold

User avatar
smacknab
Posts: 129
Joined: Wed Sep 25, 2019 4:23 pm
Year and Model: 99 s70 NA Manual
Location: Boston
Has thanked: 37 times
Been thanked: 4 times
United States of America
smacknab

Re: Ob2 port won't read codes, personal reader and store reader - 99 s70 na

Post by smacknab » Sun Dec 29, 2019 2:51 pm

RickHaleParker wrote:
Sun Dec 29, 2019 2:36 pm
Look for power on pin #16.
Pin #16 Fuses: 11C/5 & 11A/6.

Image
Checked my cig lighter fuse and it's good. Powered from rear cig lighter, front has never hade power (It looks pretty clogged with junk).

Checked for power from 4/5 to 16 and nothing. Only seemed to find power there with a couple other ones. Maybe there's a ground I forgot to hook back up?

Also the cel came back on, and now has turned off again..

User avatar
RickHaleParker
Posts: 3577
Joined: Mon May 25, 2015 2:30 pm
Year and Model: See Signature below.
Location: Kansas
Has thanked: 3 times
Been thanked: 434 times
United States of America
RickHaleParker

Re: Ob2 port won't read codes, personal reader and store reader - 99 s70 na

Post by RickHaleParker » Sun Dec 29, 2019 3:24 pm

Fuses 11A/X are the large fuses under the hood.
Fuses 11B/X are the small fuses under the hood.
Fuses 11C/X are on the CEM under the driver's side of the dash.
Platform: P80 1998 C70, B5234T3, 16T, AW50-42, Bosch Motronic 4.4, Special Edition package, Plant: Uddevalla Sweden.

Platform: X40 (Nedcar) 2003 S40, B4204T3, 14T twin scroll AW55-50/51SN, Siemens EMS 2000. Plant: Born Netherlands.

Platform P2 2005 XC90 T6 Executive, B6294T, 4T65 AWD, Bosch Motronic 7.0,
Plant Torslanda Sweden.
----------------------------------------------------------------
1997 S90, B6304S, AW30-42, Bosch Motronic 4.4 - Sold

User avatar
smacknab
Posts: 129
Joined: Wed Sep 25, 2019 4:23 pm
Year and Model: 99 s70 NA Manual
Location: Boston
Has thanked: 37 times
Been thanked: 4 times
United States of America
smacknab

Re: Ob2 port won't read codes, personal reader and store reader - 99 s70 na

Post by smacknab » Sun Dec 29, 2019 4:56 pm

RickHaleParker wrote:
Sun Dec 29, 2019 3:24 pm
Fuses 11A/X are the large fuses under the hood.
Fuses 11B/X are the small fuses under the hood.
Fuses 11C/X are on the CEM under the driver's side of the dash.
Ah ok I'll take a look for those!

User avatar
wizechatmgr
Posts: 1310
Joined: Thu Jan 12, 2017 1:07 pm
Year and Model: 1999 V70 XC AWD 2.4T
Location: Albany, NY area
Has thanked: 22 times
Been thanked: 53 times
Contact:
United States of America
wizechatmgr

Re: Ob2 port won't read codes, personal reader and store reader - 99 s70 na

Post by wizechatmgr » Sun Dec 29, 2019 5:51 pm

Probably won't be the large ones. Others should blow first (in theory)
Wisdom requires knowledge as a prerequisite, but knowledge can be developed due to a lack of wisdom.
In order to learn how to fix something, you must first learn how to break it.
1999 V70 XC AWD - ~187k miles

jimmy57
Posts: 6514
Joined: Fri Nov 12, 2010 9:25 am
Year and Model: 2004 V70R GT, et al
Location: Ponder Texas
Has thanked: 3 times
Been thanked: 216 times
jimmy57

Re: Ob2 port won't read codes, personal reader and store reader - 99 s70 na

Post by jimmy57 » Sun Dec 29, 2019 8:00 pm

The Immobilizer module is in the obdII line to ECM, they use the wire for diag and for immo communication. I don't have a wiring diagram handy but you unplug immo box and jumper the pin in from diag port and the one out to ECM and then try diagnostics with ECM.

User avatar
abscate
MVS Moderator
Posts: 19999
Joined: Sun Feb 17, 2013 5:54 pm
Year and Model: 99T5 ,99S70,2005V70
Location: NYC, ALBANY NY
Has thanked: 272 times
Been thanked: 849 times
Trinidad & Tobago
abscate

Re: Ob2 port won't read codes, personal reader and store reader - 99 s70 na

Post by abscate » Sun Dec 29, 2019 8:59 pm

Check the voltage from 16 to a chassis ground to see if pin 16 has battery voltage
Empty Nester
A Captain in a Sea of Estrogen
1999-V70-T5M56 2005-V70-M56 1999-S70 VW T4 BMW
Link to Maintenance record thread
Link To Volvo Glossary

User avatar
misha
Posts: 4144
Joined: Sun Dec 07, 2008 4:09 pm
Year and Model: '97 850 2.5 20v
Location: Serbia
Has thanked: 49 times
Been thanked: 112 times
Serbia
misha

Re: Ob2 port won't read codes, personal reader and store reader - 99 s70 na

Post by misha » Mon Dec 30, 2019 3:07 am

jimmy57 wrote:
Sun Dec 29, 2019 8:00 pm
The Immobilizer module is in the obdII line to ECM, they use the wire for diag and for immo communication. I don't have a wiring diagram handy but you unplug immo box and jumper the pin in from diag port and the one out to ECM and then try diagnostics with ECM.
That's correct for '96-'98 cars,jimmy57,which use K-line for communiction.

But '99 use CAN protocol,so that may be different on these '99 & '00 cars since modules are "married" to the car....at least on EU market cars.
I don't know if this still apply for U.S market cars.
'97 850 2.5 20v / fully equipped / Motronic 4.4 from the factory / upgraded with S,V,C,XC70 instrument cluster / polar white wagon
'91 Citroen XM 2.0 SI /fully equipped/mandarine red metallic
History of Volvos in the family:
'71 144 S
'73 144 De Luxe
'78 244 DL
'78 244 DL
'79 244 GLE
'85 340 GLS

Post Reply
  • Similar Topics
    Replies
    Views
    Last post