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97 855 GLT EEC Trouble code help Topic is solved

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Chuck W
Posts: 27
Joined: Wed Dec 24, 2014 10:45 am
Year and Model: 97 854 T5
Location: Indianapolis, IN
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Re: 97 855 GLT EEC Trouble code help

Post by Chuck W » Fri Jun 09, 2017 12:47 pm

AKJeeper wrote:
Fri Jun 09, 2017 12:11 pm

I'm going to make another one on how to get the system to relearn the damper motor positions at some point in the near future...
That would be a useful one.

Chuck W
Posts: 27
Joined: Wed Dec 24, 2014 10:45 am
Year and Model: 97 854 T5
Location: Indianapolis, IN
United States of America

Re: 97 855 GLT EEC Trouble code help

Post by Chuck W » Sun Jun 11, 2017 12:01 pm

AKJeeper wrote:
Fri Jun 09, 2017 12:11 pm
abscate wrote:
Thu Jun 08, 2017 3:07 pm
Software, high end scanner, or Volvo Dealer - it won't reset with a battery disconnect
I've got a video on how to read and clear the codes with a home made tool.

https://youtu.be/LpoyZsaPVqc

I'm going to make another one on how to get the system to relearn the damper motor positions at some point in the near future...
Do you happen to have this info handy? Even if not on a video yet?

Chuck W
Posts: 27
Joined: Wed Dec 24, 2014 10:45 am
Year and Model: 97 854 T5
Location: Indianapolis, IN
United States of America

Re: 97 855 GLT EEC Trouble code help

Post by Chuck W » Sun Jun 11, 2017 12:05 pm

I cleaned out the fans on the interior temp sensors and reset the codes.

Was left with 2-3-1 - Ventilation Dmpr Motr Position Sensor Circuit Open or shorted to power.

Chuck W
Posts: 27
Joined: Wed Dec 24, 2014 10:45 am
Year and Model: 97 854 T5
Location: Indianapolis, IN
United States of America

Re: 97 855 GLT EEC Trouble code help

Post by Chuck W » Sun Jun 11, 2017 4:39 pm

OK, well today's 4 hour odyssey involved trying to fix this nonsense.

The first thing was to clean out the sensor fans.

After that and the DTC from above (2-3-1) I just went ahead and pulled out both temp damper motors, the ventilation damper motor and the floor defrost damper motor. Cleaned off the position tracks (all had some grease on them) and reinstalled them.

After that, I wanted to to do the 9-9-9 damper motor position relearn thing. Looking at the manual, I figured out how to perform it, but I can't get it to take.
Self-Adjustment Of Damper Motor Limit Positions
1) Turn ignition on. Place fan (blower motor) lever in manual mode. Turn function selector to AUT (automatic). Ensure system is in TEST MODE 4.

2) Enter control code 9-9-9 by pressing button on diagnostic unit 9 times in quick succession. Enter each of the 9 series 3 times, with a short pause in-between to allow LED to come on again. ECC control module is now ready to adjust damper motor limit positions automatically.

3) Wait about 10 seconds for fan to start. Turn ignition off to exit TEST MODE 4. Turn ignition on. AC OFF and REC indicator on A/C control panel should flash. Drive car for a few minutes at speeds greater than 20 MPH.

4) Stop car and turn engine off, but leave ignition on for at least 2 minutes to enable ECC control module to store all values.

Start TEST MODE 1 and record DTCs. If DTC 1-1-1 appears, selfadjustment is complete. If DTC 5-1-1 appears, self-adjustment is not complete.


I did it twice, but still get the 5-1-1 DTC. The first time I shut the ignition off instead of leaving it on. It's kind of hard to turn engine off and leave the ignition on (In POS II). So maybe that's my issue.

After checking and erasing codes a couple times, I've wound up with these DTCs.

2-3-3 - Floor/Defrost Damper Motor Position Sensor Circuit Open Or Short To Power
3-2-4 - Floor/Defrost Damper Motor Active Too Long
5-1-1 - Self-Adjustment Of Damper Motor Limit Positions Not Carried Out

Right now that damper is in full floor mode, and won't switch to defrost. I've had it apart and cleaned it and tested its operation with a 9V battery, so it's not stuck.

Chuck W
Posts: 27
Joined: Wed Dec 24, 2014 10:45 am
Year and Model: 97 854 T5
Location: Indianapolis, IN
United States of America

Re: 97 855 GLT EEC Trouble code help

Post by Chuck W » Wed Jun 14, 2017 7:36 pm

So, we're going to try and score another damper motor at the PnP this weekend.

A bad damper could also be what's keeping the system from self-adjusting the damper limits, I assume?

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jreed
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Re: 97 855 GLT EEC Trouble code help

Post by jreed » Thu Jun 15, 2017 5:12 am

I had good luck with two of my original dampers -- cleaning the carbon tracks restored normal operation. I tried cleaning the third one but it wouldn't work correctly. I had to replace it with a spare, which has been working fine for a couple years so far.
1997 855 GLT (Light Pressure Turbo) still going strong. Previous: 1986 240 GL rusted out in '06, 1985 Saab 900T rusted out in '95, 1975 Saab 99 rusted out in '95, 1973 Saab 99 rusted out in '94

Chuck W
Posts: 27
Joined: Wed Dec 24, 2014 10:45 am
Year and Model: 97 854 T5
Location: Indianapolis, IN
United States of America

Re: 97 855 GLT EEC Trouble code help

Post by Chuck W » Thu Jun 15, 2017 7:49 am

jreed wrote:
Thu Jun 15, 2017 5:12 am
I had good luck with two of my original dampers -- cleaning the carbon tracks restored normal operation. I tried cleaning the third one but it wouldn't work correctly. I had to replace it with a spare, which has been working fine for a couple years so far.
This one has been apart and cleaned a couple times, so I think it's toast. All of the ones I took apart were pretty covered in grease. There are 2 850's in the yard right by us, so we should be able to score a couple extras to keep on hand.

Chuck W
Posts: 27
Joined: Wed Dec 24, 2014 10:45 am
Year and Model: 97 854 T5
Location: Indianapolis, IN
United States of America

Re: 97 855 GLT EEC Trouble code help

Post by Chuck W » Sun Jun 18, 2017 4:07 pm

So, had a chance to spend more time on this over the weekend. Grabbed a couple spare damper motors from an 850 at the PnP down the road.

Pulled the Floor/Def motor out and installed a "new" cleaned, tested one.
After that, I tried to self-adjust the motor positions with the "9-9-9". Took it for a drive, as instructed.

Came back and STILL get the "5-1-1" code, indicating that the self-adjustment didn't work.

Additionally, the old DTCs were gone and now I'm stuck with a "3-2-3" which is "Ventilation Damper Motor Active Too Long". I grabbed the spare I pulled from the yard and cleaned the position tracks. Then wrestled it into place, trying to keep the two gears lined up properly. Royal pain in the butt, really.

Pull it all back together and STILL have the "3-2-3" and "5-1-1" codes. Even after a couple attempts of erasing codes and self-aligning...

What am I missing here?

Chuck W
Posts: 27
Joined: Wed Dec 24, 2014 10:45 am
Year and Model: 97 854 T5
Location: Indianapolis, IN
United States of America

Re: 97 855 GLT EEC Trouble code help

Post by Chuck W » Mon Jun 19, 2017 5:40 am

Thinking about something with the Vent Damper Motor.

Should the big internal gear be more in the middle of its adjustment range when trying to get it aligned and installed with the gear on the flapper? There is the larger tab/slot in each of the two gears, which is probably the alignment index. They weren't engaged when I removed the first one (previous owner had been there, evidently) and there are no references in the manual about the alignment.

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jreed
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Year and Model: '97 Volvo 855 GLT
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Re: 97 855 GLT EEC Trouble code help  Topic is solved

Post by jreed » Tue Jun 20, 2017 5:03 am

I'm not sure about the Ventilation Damper. For the driver's side damper motor, the gear angle was about at the middle of it's range. Photo here:
viewtopic.php?t=50525
1997 855 GLT (Light Pressure Turbo) still going strong. Previous: 1986 240 GL rusted out in '06, 1985 Saab 900T rusted out in '95, 1975 Saab 99 rusted out in '95, 1973 Saab 99 rusted out in '94

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