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99 s70 died on highway : multiple codes 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

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amblerman
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Re: 99 s70 died on highway : multiple codes  Topic is solved

Post by amblerman » Sun Jul 21, 2019 5:44 pm

btw. for my 1999 s70, I am using this serpentine belt routing. I lost my l diagram I drew when I first took it off to do my AC shim fix but I believe it's correct. Can someone confirm with more experience than I?

A lot of "s70 serpentine belt " searches show my the 850 and pre-99 routing and that's different.

Below is what I am using.

I have already taken my alt out again so I can't fire it up and watch the direction of spin but I believe this routing will spin my alternator counter clockwise. I verified that is correct with the arrow on my alternator.

And yes, I'm doing all this in my driveway with this wonderful 100 degree (38C ) heatwave we're having here in the eastern US so I almost can't even think straight right now.

-A
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Re: 99 s70 died on highway : multiple codes

Post by abscate » Mon Jul 22, 2019 3:12 am

Yes. If you don’t have a tool use a strong cord and put the belt onto the ps pulley last, the bigger the pulley, the easier it is to slip a belt on it.

Or

Catch me on the drive by Tuesday with my AKN tool in the car.

:)
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Re: 99 s70 died on highway : multiple codes

Post by amblerman » Tue Jul 23, 2019 4:31 pm

I do have a nice serpentine belt tool now. I battled with using my breaker bar and actually ground down my torx socket because using the breaker bar with the socket was really too long.

When I did my AC shim fix job, I cursed enough times that I went and bought a proper thin serpentine belt tool. Makes a world of difference.
However, I had to buy a new T60 because now my ground down T60 was really too short now. Figures.

But the thin serpentine belt tool works so much better than my breaker bar did. The breaker bar was just too short (oddly enough) and too thick for the narrow clearances.

-A

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Re: 99 s70 died on highway : multiple codes

Post by amblerman » Mon Aug 05, 2019 12:00 pm

Here a quick update on this issue.
Car is back on the road. Here's what I did.
1) replaced all + battery cables. Did not resolve issue. I didn't think it was going to.. I replaced these because of so many people recommending doing this on a 20 year old volvo. I also realized that my positive battery terminal had already been replaced and I didn't like the style.

2) took alternator out and verified what I could. ie: diodes worked, no shorts, and slip rings* all passed tests.

3) got new voltage regulator.

That seemed to do the job. battery now reads 13.9 V while at idle so the alternator is putting out some juice.

The slip rings were less than ideal. At least one was.
brushslant.png
brushslant.png (117.32 KiB) Viewed 83 times
I posted this picture in another thread. As you can see, the brushes are of different length. However, the surprise was with the brush that is worn at an angle. I had noticed that when I took the regulator out but I didn't understand the full implications until I took apart my alternator.

it actually cut a sloped gouge into on of the slip rings. I don't like that. I have a new set of slip rings on order and will replace those in a couple of weeks. I'm getting good at taking the alternator out and apart.

Right now it works. The slip rings passed their continuity and resistance tests but they are definitely damaged.

I'll create a write up on that job.

But for me, what failed was my old voltage regulator/brush length.
-A

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Re: 99 s70 died on highway : multiple codes

Post by dj_v70 » Mon Aug 05, 2019 1:17 pm

I had a similar problem with a 240 Volvo about 20 years ago. I had popped a diode somehow jumping a friends car (I even heard the loud pop as it blew). Alternator still seemed ok but I eventually ended up with slip ring wear like yours which someone told me was related. So, I replaced the diode and left the slip rings like that, just need to replace the regulator more often;)

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Re: 99 s70 died on highway : multiple codes

Post by abscate » Mon Aug 05, 2019 2:12 pm

I'm getting good at taking the alternator out and apart.
You are hereby proclaimed Alternator TETRIS MASTER
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Re: 99 s70 died on highway : multiple codes

Post by Philosopat » Fri Jan 03, 2020 12:24 pm

:lol:

Okay...

So i had this same issue and it was terrifying/frustrating. Left the car overnight luckily only a couple miles from home. Had to walk when I'm already sore and tired from some hiking and working out.

It was sundown in Northern Colorado in January too so luckily i was wearing a coat!

Anyway i started researching through these amazing forums and had to join.

*ISSUE SOLVED*

Know what it was for me?

(drumroll please)

Traced a low voltage P0562 code to the alternator... The small red wire that plugs in on the right top side of the alternator had wiggled itself loose! The actual plug clip is broken. I used some electrical tape to keep that connector in place and the car is now running and driving fine.

Kinda hard to drive without a functional alternator huh?

This had me so worried as i was getting the following codes when it occurred:

p0562, p0341, p0336 + pd, p0339 + pd

While driving, the car was sputtering, lights all acting up, wouldn't start, triggered the p1670 immobilizer code also so i locked and unlocked the door manually 5 times and reset the codes.

Now i have 0 codes and can start focusing on general upkeep and repair.

This car only has 131k on it, practically new!

I have a feeling the previous owner was having shorting issues with this exact same wire!

I'll eventually replace the cable as electrical tape is no permanent solution.

I recently also had to replace the fuel pump relay also under the fuse box on driver side under hood.

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Re: 99 s70 died on highway : multiple codes

Post by amblerman » Fri Jan 03, 2020 6:23 pm

Your post made me realize I never wrote up a follow up to my adventures.
Here's a short summary.

1) I replaced all the wires associated with my battery: battery ground, battery to fuse box, batter to starter, and starter to alternator. This did not solve any issue but I no can no longer measure any voltage drop in system so that's good. Prior to this there were slight drops.

2) I had my car running ok with new voltage regulator for a while but as noted above, my slip rings were damaged so I planned on replacing those.

3) Since I was going to be in there replacing the slip rings, I figured I'd replace the alternator bearings as well.

4) Slip ring job: easy.... bearing on slip ring side: easy... bearing on pulley side: difficult...
5) rebuilt alternator: lasted approximately 3 seconds after hooking it all back up. I damaged or broke something while rebuilding it.
6) new alternator from FCP... working great since September when I got the alternator.

What annoys me the most is I don't know what I did wrong or what I broke. Oh well.

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