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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
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1997 - 2000 V70, V70 AWD
1997 - 2000 V70-XC
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smacknab
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Re: Ob2 port won't read codes, personal reader and store reader - 99 s70 na

Post by smacknab » Mon Dec 30, 2019 8:35 am

abscate wrote:
Sun Dec 29, 2019 8:59 pm
Check the voltage from 16 to a chassis ground to see if pin 16 has battery voltage
Pin 16 to the frame near the driver's side door hinge read about 2 mV

I'll check the under dash fuses when it stops hailing, but thanks to everyone for chiming in. To be honest it's a little over my head at the moment but I'll check the fuses soon and report back what I find

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

Post by abscate » Mon Dec 30, 2019 9:08 am

If I plug an OBD READERinto a 1999 am I reading on the K line or CAN BUS?

Will it depend on the protocol of the scanner, perhaps?
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Re: Ob2 port won't read codes, personal reader and store reader - 99 s70 na

Post by smacknab » Mon Dec 30, 2019 11:08 am

Someone suggested I check that it's plugged in, looks good to me.

Still waiting for dry weather to check the lower fuses
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Re: Ob2 port won't read codes, personal reader and store reader - 99 s70 na

Post by jimmy57 » Mon Dec 30, 2019 11:17 am

K line is what Generic readers use. K line is used by VIDA (and some others I suppose) to tell the CDM (inst cluster) to open the gateway and connect high speed CAN wires.
If the scan tool came on, display was on, but wouldn't communicate then K line issue is likely. If the tool did not come on then the pin 16 wire or ground is suspect.

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

Post by smacknab » Mon Dec 30, 2019 11:38 am

jimmy57 wrote:
Mon Dec 30, 2019 11:17 am
K line is what Generic readers use. K line is used by VIDA (and some others I suppose) to tell the CDM (inst cluster) to open the gateway and connect high speed CAN wires.
If the scan tool came on, display was on, but wouldn't communicate then K line issue is likely. If the tool did not come on then the pin 16 wire or ground is suspect.
No display came on. I'm going to get some contact spray and try that. When you say ground, does that mean any ground in the car? I did just take the head off and reassemble the car, so possibly i missed a ground wire in the engine bay on reassembly?

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

Post by abscate » Mon Dec 30, 2019 11:50 am

You’ve got no voltage on pin 16 on the OBD

Start tracing backwards from that pin to see where you lose the 12 volts

That’s the systematic approach
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Re: Ob2 port won't read codes, personal reader and store reader - 99 s70 na  Topic is solved

Post by RickHaleParker » Mon Dec 30, 2019 12:12 pm

11A/6 & 11C/5 fuses under hood.

24/2A Connector Green 12-pin (male- female)
Engine compartment cable harness - Firewall cable harness

24/7B Connector Natural10-pin (male- female)
Firewall cable harness- Tunnel cable harness
EM2.png
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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

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

Post by smacknab » Mon Dec 30, 2019 12:40 pm

Found it! Fuse 11c/5 was blown. Ob2 is scanning again. Thanks everyone for the hand holding, I didn't know that the fuses had different designations based on their location!

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

Post by abscate » Mon Dec 30, 2019 12:47 pm

Excellent. There is one weakness with the incredibly well-done Volvo wiring diagrams

Sometimes, you want to know everything that is on a circuit so you can figure out what is making the fuse blow.

1 You can famously RTFM and read the fuse systems in the manual (Volvo manuals are all online for free)

2 You can look at the back of the fuse and color/mechanically trace the wire

3 You can hunt through all the wiring diagrams and look for references to the (example above 11C/5) fuse designation.

SM - for the 11C/5 I think this circuit feeds:

Engine cooling fan
ECC climate control
MCC climate control
Diagnostics

so if it blows again, that's the list of things to check
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Re: Ob2 port won't read codes, personal reader and store reader - 99 s70 na

Post by RickHaleParker » Mon Dec 30, 2019 12:56 pm

11C/5
  • Engine cooling fan (FC)
    Diagnostics (OBD pin #16)
    Standard heater
    Manual climate control (MCC)
    Electronic climate control (ECC)
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

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