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98 S70 Strange Transmission issues 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

yanga001
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98 S70 Strange Transmission issues  Topic is solved

Post by yanga001 » Sun May 03, 2020 1:20 pm

Hi Everyone,

So i picked up a 98 s70 N/A a while back for parts and it seemed that the only issue with it was a bad transmission. After taking a look and doing a drain and fill i seem to be getting a P0748 and the flashing up arrow of death. Well, we checked the PNP and it seemed fine. There was no indication of damage or chips after doing the drain and fill, and it seemed to have all the pickup when going in reverse.

After leaving it for a bit i found some more time due to the pandemic and tried to take it out down the property to see if it felt dead. I had no pickup in drive as was expected, however dropping it into L & 3 resulted in the car operating and shifting normally through those gears. There were no lurches or any indication that the transmission was dead.

Given all this my best course of action seems to be to pop out the transmission and take a look at the S1 shift solenoid.

If the shift solenoid was bad, would the car still be able to shift normally in L and 3 gears? Reverse also works fine. An unrelated issue also include hard hot starts to the extent that the car will run normally and not start after when it is hot. Letting it sit for a while seems to do the trick. Im pretty sure its a fuel pressure related issue and not related to the transmission.

Thanks!
1998 V70 N/A Auto
1998 V70 N/A Auto (Workhorse) (Tree to driver B pillar :( )
1999 S70 T5 Auto(Project)

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RickHaleParker
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Re: 98 S70 Strange Transmission issues

Post by RickHaleParker » Sun May 03, 2020 2:15 pm

There still hope for that transmission.

P0748 does not translate to a 1998 S70. I think you OBD scanner has poor translations. Not uncommon for generic scanners. I suggest you get a ELM327 interface version 1.4 or higher (or a good quality clone) and scan it with 850 OBD-II.

P0748 is a generic code for Pressure Control Solenoid. Could be as simple as dirty connectors or wiring defects.
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yanga001
--------
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.
Platform P2 2004 S60R, B2524T4, AW50/51 AWD, Bosch Motronic 7.0, BorgWarner K24 turbocharger, Plant Ghent Belgium.

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Ocelot
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Re: 98 S70 Strange Transmission issues

Post by Ocelot » Wed May 06, 2020 4:53 am

RickHaleParker wrote: ↑
Sun May 03, 2020 2:15 pm
There still hope for that transmission.

P0748 does not translate to a 1998 S70. I think you OBD scanner has poor translations. Not uncommon for generic scanners. I suggest you get a ELM327 interface version 1.4 or higher (or a good quality clone) and scan it with 850 OBD-II.

P0748 is a generic code for Pressure Control Solenoid. Could be as simple as dirty connectors or wiring defects.
Does this scanner in combination with the mentioned app also work on my Volvo S70 with the Feniks 5.2 motormanagement?
'Hij die zonder zonde is, werpe de eerste steen. Ik buk wel'. Simon Carmiggelt

Recent car
'98 Volvo S70 2.5 10V Europa edition (Freya)
Previous owned Volvo's
'96 Volvo 440 Si 1.8
'87 Volvo 340 GL 1.7
'85 Volvo 340 DL 1.4

yanga001
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Re: 98 S70 Strange Transmission issues

Post by yanga001 » Wed May 06, 2020 12:46 pm

Update: I seemed to have lost my cheap vag/com cable for Volvo-FCR so cant scan it with that till i find another one. I have a good ELM327 but its usb so ill need to find an otg cable for the App. I know VolFCR covers Feniks 5.2 but you need the correct Vag/Com cable with the ft232 FTDI from what i heard. You might be able to use the CH340 if you can port it as a serial port and then import that into a virtual machine although i have not tested it and would just buy the correct cable.

Ill take a look at the cables this weekend.
1998 V70 N/A Auto
1998 V70 N/A Auto (Workhorse) (Tree to driver B pillar :( )
1999 S70 T5 Auto(Project)

yanga001
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Re: 98 S70 Strange Transmission issues

Post by yanga001 » Mon May 18, 2020 3:07 pm

Update & Conclusion:

So going off the fact that the OBD2 code was wrong i had decided to try a few more random solutions for the car. I popped open the TCM and ECU housing and found that the car was running a Jetronic 4.2 (serial number 5?) and the normal Aisin TCM. I swapped the TCM & ECU with a working one from the wrecked v70 and the flashing arrow of death is now gone!! I was quite surprised by this as i was so sure there was something wrong with the transmission given that its done 300,000km + and was a bargain price at $300. The car still has a rough idle which i am pretty sure is due to a bad fuel pump and some old plugs.

Anyways, the Transmission issue was resolved by replacing the TCM with a known working one. The ECU swap was just for fun.
1998 V70 N/A Auto
1998 V70 N/A Auto (Workhorse) (Tree to driver B pillar :( )
1999 S70 T5 Auto(Project)

scot850
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Re: 98 S70 Strange Transmission issues

Post by scot850 » Mon May 18, 2020 3:26 pm

Well that was a great bit of luck! Hopefully the rest is down to a good tune up, new gasoline and a good run to blow the cobwebs out!

Neil.
2000 V70 R - still being an endless PITA
2006 XC70
2003 Toyota 4Runner V8 Limited
2015 Kia Sportage EX-L
1993 850 GLT -Sold
1998 V70 XC - Sold
1997 Volvo 850 SE NA - Went to niece in California - Sold
2000 V70 SE NA - New project and test bed - Sold

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Re: 98 S70 Strange Transmission issues

Post by RickHaleParker » Tue May 19, 2020 4:15 pm

yanga001 wrote: ↑
Mon May 18, 2020 3:07 pm
Anyways, the Transmission issue was resolved by replacing the TCM with a known working one. The ECU swap was just for fun.
Was the connector dirty ? Keep telling people that you got to maintain the electrical wiring and connectors on the microcomputer controlled cars. Probably sound like a parrot to some. One cannot let the electrical wiring and connectors go like one could on the old electrical/mechanical controlled cars.

Last week my S40 was misfiring. Cleaning the connector to the MAF was all it took to make it fly right. It is a first generation on the X40 platform. It has a waste spark ignition system.
--------
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.
Platform P2 2004 S60R, B2524T4, AW50/51 AWD, Bosch Motronic 7.0, BorgWarner K24 turbocharger, Plant Ghent Belgium.

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misha
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Re: 98 S70 Strange Transmission issues

Post by misha » Wed May 20, 2020 1:17 pm

All '97 & 98 20v cars B5254S have Motronic 4.4 management...not Jetronic and certainly not Jetronic 4.2.
LH 3.2 Jetronic is used in early 850 with separate ecu(s) for engine and ignition.
Jetronic 4.2 doesn't exist in these cars.
Last edited by misha on Wed May 20, 2020 1:44 pm, edited 1 time in total.
'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

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misha
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Re: 98 S70 Strange Transmission issues

Post by misha » Wed May 20, 2020 1:41 pm

yanga001 wrote: ↑
Wed May 06, 2020 12:46 pm
...I know VolFCR covers Feniks 5.2 but you need the correct Vag/Com cable with the ft232 FTDI from what i heard...
Vol-Fcr doesn't cover Fenix 5.2 and M4.3. since they are OBDI and still produce flash codes.
It covers just M4.4 management which is fully OBDII.
'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

yanga001
Posts: 34
Joined: Sun Mar 24, 2019 3:25 pm
Year and Model: 1998 v70 N/A
Location: Ontario
Has thanked: 11 times
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yanga001

Re: 98 S70 Strange Transmission issues

Post by yanga001 » Thu May 21, 2020 1:42 pm

misha wrote: ↑
Wed May 20, 2020 1:41 pm
yanga001 wrote: ↑
Wed May 06, 2020 12:46 pm
...I know VolFCR covers Feniks 5.2 but you need the correct Vag/Com cable with the ft232 FTDI from what i heard...
Vol-Fcr doesn't cover Fenix 5.2 and M4.3. since they are OBDI and still produce flash codes.
It covers just M4.4 management which is fully OBDII.
My bad, thanks for the corection.
1998 V70 N/A Auto
1998 V70 N/A Auto (Workhorse) (Tree to driver B pillar :( )
1999 S70 T5 Auto(Project)

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