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ECC Damper Motor Adjustment

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

heat391
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heat391

ECC Damper Motor Adjustment

Post by heat391 » Sat Feb 20, 2010 4:31 pm

Hoping someone can help.......

I have a 94 855 Turbo w/ECC (recently aquired, first Volvo)

The driver side damper motor was not working, showing a code of motor active too long. Code returned after clearing all the codes. Got several motors from the JY, tried a couple.....Went through the process from Haynes for damper auto adjustment. Did this at least 4 times.....

Code shows 5-1-1 auto adjustment not completed, even though I followed the directions!! Argh!! Maybe I'm not reading something right, but I'm ready to pull out my hair!

To add insult to injury, when I check VADIS, there is a different procedure (tried that one too, with neg results)

HELP!!!!! :cry:

PS: I opened 2 of the motors and cleaned up the grease from the contact as shown in the post from last week......

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Ozark Lee

Re: ECC Damper Motor Adjustment

Post by Ozark Lee » Sat Feb 20, 2010 7:50 pm

How are the shafts on the dampers where the motors plug in? They will often crack. If you catch them soon enough you can repair them. There are several variations of the repair in the database. You can often wrap them like a fishing rod joint with small gauge solid copper wire or you can slide a bushing over the joint. I can't recall the caliber but one of our members sawed a pistol shell casing in half and it was a perfect fit to hold the joint back together.

...Lee
'94 850 N/A 5 speed
'96 Platinum Edition Turbo
Previous:
1999 V70XC - Nautic Blue - Totaled while parked.
1999 V70XC - RIP - Wrecked Parts Car.
1998 S70 T5
1996 850 N/A
1989 740 GLT
1986 740 GLT
1972 142 Grand Luxe

heat391
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heat391

Re: ECC Damper Motor Adjustment

Post by heat391 » Sat Feb 20, 2010 8:02 pm

Can't verify the condition of the shaft, it's the driver temp damper motor, and I can barely contort enough to unbolt it much less see the end of the shaft.

That being said, I think that the shaft is ok.... when I first replaced the motor, I had to rotate the shaft so that it would line up with the newish motor. The shaft rotates I'll guess about 70 degrees or so....

But, even if the shaft was at issue, wouldn't the the motor still "adjust" under the procedure?

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VCA

Re: ECC Damper Motor Adjustment

Post by VCA » Sun Feb 21, 2010 6:53 am

I'm not sure the Haynes manual is correct on the setup of the ECC panel before entering test mode 4, code 9-9-9.

Did you:
  • Ignition off.
  • Blower switch in Manual position, half power.
  • Recirculation on.
  • Left and right temperature controls set to 22°C or 72°F.
  • Air flow selector set between Ventilation/Defrost. (exactly between face vent and defrost, the selector is pointing approximately 335 degrees, if defrost is 0 degrees and the direction of rotation is CW)
  • Air conditioning (A/C) switch on AUTO.
Then:
  • Ignition on.
  • Activate DTM 4 for self-adjustment of damper limit positions.
  • Wait approx. 10 seconds to let heater fan start.
  • Ignition off to exit test mode 4.
  • Ignition on.
Finally:
  • Drive car for a few minutes at a speed over 30 km/h. The control unit will then carry out self-adjustment while driving. (Editor's Note: you should be able to feel this happening, if you don't, it isn't happening!)
  • Stop car but leave ignition on for at least two minutes to enable control unit to store all values.
If the control module doesn't carry out self adjustment this time, it's likely you need a new one (learned that lesson on my S70--had one that VADIS couldn't make adjust and always blew hot air)
2008 S80 T6 AWD
1999 S70 GLT

Responsible for the care of a '92 960 and an '07 S60R

heat391
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Re: ECC Damper Motor Adjustment

Post by heat391 » Mon Feb 22, 2010 4:59 pm

VCA.

Thanks for the info...... but, still no luck... argh!!

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VCA

Re: ECC Damper Motor Adjustment

Post by VCA » Mon Feb 22, 2010 5:06 pm

heat391 wrote:VCA.

Thanks for the info...... but, still no luck... argh!!
When you run 9-9-9, does the fan start after a few seconds? If not, it's likely a bad ECC unit.
2008 S80 T6 AWD
1999 S70 GLT

Responsible for the care of a '92 960 and an '07 S60R

heat391
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Re: ECC Damper Motor Adjustment

Post by heat391 » Mon Feb 22, 2010 7:49 pm

The fan does start up..... I let it run about 10-15 secs, then turn the ignition off, put the diag wire back in it's holder, and put the covers on. I back down the driveway, and am off.... I drive for a few mins over 20mph (during this time the speed does drop a couple times for turns), let the car idle for at least 2 min, shut off, go back to the diag module, wire B1, check, 5-1-1.....

I'm only having a prob with the d side damper motor for the heat/cool

Does anyone know, if you plug in a damper motor, without bolting it to the heater box, will it still try to adjust? I figure this way I can check the motors before going to the trouble of bolting them up.....

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VCA

Re: ECC Damper Motor Adjustment

Post by VCA » Mon Feb 22, 2010 7:55 pm

heat391 wrote:The fan does start up..... I let it run about 10-15 secs, then turn the ignition off, put the diag wire back in it's holder, and put the covers on. I back down the driveway, and am off.... I drive for a few mins over 20mph (during this time the speed does drop a couple times for turns), let the car idle for at least 2 min, shut off, go back to the diag module, wire B1, check, 5-1-1.....

I'm only having a prob with the d side damper motor for the heat/cool

Does anyone know, if you plug in a damper motor, without bolting it to the heater box, will it still try to adjust? I figure this way I can check the motors before going to the trouble of bolting them up.....
Yes, as long as it's plugged in to the harness, it should adjust, if the ECC is commanding it. The problem on my S70 is that the ECC wasn't commanding adjustment, even after being initialized...the fix was to replace it :cry: .
2008 S80 T6 AWD
1999 S70 GLT

Responsible for the care of a '92 960 and an '07 S60R

heat391
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Re: ECC Damper Motor Adjustment

Post by heat391 » Tue Feb 23, 2010 3:01 pm

Ahhhhhh......

Wasn't sure, that would save a bit of time trying to figure out which JY motor works (if any of them do).....

Do you know of another way of testing the motors other than trying to swap with a known working motor?

i.e., put 12v to a certain pin....

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JarVolv850

Re: ECC Damper Motor Adjustment

Post by JarVolv850 » Fri Jan 17, 2020 12:33 pm

To test motors you can put 9v to pins 1-2 for driver, 3-4, 5-6, 7-8, 9-10 (passenger, flor, vent, rec). you should hear the movement if not change the polarity. This will verify movement. in parallel you check resistance on connector A (30 pins) between 8 and 17, 18, 19, 20, 21 (driver, pass, flor, vent, rec). Hope it helps.

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