1999 S70 Damper motors won't calibrate 9142629

Post by **VCA** » 20 Mar 2014, 18:07

I recently replaced a broken passenger side damper motor. The installation of the new replacement went OK and the damper motor moves (albeit incorrectly), but I am unable to get the ECC to calibrate. I requested a calibration through VIDA, the A/C ON LED flashes, but it never runs through calibration (I have no movement at all in the dash). I tried swapping the ECC unit with a known good one and it won't calibrate either -- same problem. I've verified the D+ signal and that power is on the correct pins.

The unit had DTCs CCM-322 (Air distribution damper, active too long), CCM-314 (Damper motor temperature passenger, active too long), and CCM-316 (Recirculation damper motor, active too long)

I don't know what to check next. Suggestions would be greatly appreciated, thanks!

Post by **jimmy57** » 20 Mar 2014, 20:32

All three of those codes were there before you replaced the damper motor? Which one on RH side did you replace?
One of the motors (it has been a LONG time since I replaced any of those) can be fitted wrong. IT can come out of the box in a position that allows you to move the door and bolt up the motor. The ECC will, in the moment key comes on, attempt to position that door to the position it wants it with old calibration and it stalls and stops the possibility of calibration before you can get calibration started with VIDA. IF this is it then you have to figure out if it is fitted with that door almost CW stopped or CCW stopped. Then you can snap apart the new motor and clock the drive spindle to where it is most of the way CW or CCW as you found the door and clocked where the motor will fit the door.

Used damper motor or new? If new where sourced?

DO not calibrate with dampers not on box. That puts end stops in that will cause this same issue. The fix then is to put the fouled ECC module in another car and calibrate it there and then back into the other car and calibrate again. Nightmarish. Digital motor tracking is SO much better.

Post by **VCA** » 20 Mar 2014, 21:08

jimmy57 to the rescue! [Thank you!]

All three codes were present prior to repair. The pax temp damper motor (the one lower and further back on the pax side that requires removing the floor duct to get to easily) was replaced due to no movement at all when changing the temp on that side. The replacement damper was new (Volvo of Dallas), part 9142629, and I did follow the procedure in "Setting damper motors, damper for self-adjustment" (key in II, blower on, ran the motor to full hot and watched it move, then physically turned the damper to full hot and verified hot air blowing, and installed the damper motor).

...and yes, I wish these were just LIN motors like in my S80 (though the blower replacement is a darn sight easier on this car than on the S80

)

Post by **jimmy57** » 20 Mar 2014, 21:13

A new motor is supposed to be centered and then it can't be wrong. They are not always centered and then the motor can be off towards hot and the shaft can be turned towards cold (or vice versa) and it will fit. Now the motor can't get to where the ECC module wants it.

Post by **VCA** » 20 Mar 2014, 21:28

Ok, thanks for the insight into how the system works, I appreciate it. I'll check that tomorrow. Since I hear/feel no damper movement at all with the calibration, I'm wondering if one of the other damper motors has an issue; do you know what order the ECC runs the calibration? Thanks!

Post by **abscate** » 21 Mar 2014, 03:40

My Alldata reports you should turn the key to position I or II and push the RECIRC button three times within 3 seconds of turning key to ON.

It might be worth trying that.

Post by **VCA** » 21 Mar 2014, 16:58

abscate wrote:My Alldata reports you should turn the key to position I or II and push the RECIRC button three times within 3 seconds of turning key to ON.

It might be worth trying that.

Thanks for the tip, but it did nothing on my ECC. I've got two ECCs, both blinking at me and refusing the calibrate. What is the best starting place for this problem? The dampers that threw the codes?

EDIT: I pulled the motor and inspected the pax side damper (it turns, no splits in the shaft) and the recirc damper motor (runs fwd and back, variable resistances are noted between appropriate terminals, and yes, I marked the position before I moved it). No calibration happens with either ECC (engine running, all controls to Auto, moving faster than 30 km/hr). Tomorrow, when I have light, I'll go back and check the air distribution damper.

Post by **VCA** » 02 Aug 2014, 09:43

I realize I never followed up. The air distribution damper had failed...and since it's the first one to go through calibration, the system never got past it to calibrate. Once I'd replaced it, turned the key, the system calibrated and the flashing A/C light turned off.

Post by **abscate** » 30 Apr 2020, 08:53

I just stripped off one of the recirculated fresh air motors 9142629 for a fellow MVS project and never realized that it is designed to be removed with dash in

The motor bayonets into a plastic bracket that is not easily removed but one T15 accessible from the rear of car allows it to slip out.

Well done, Volvo