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kickdown solenoid- auto trans

1984 928 S........... Does anyone know where the kickdown solenoid valve is located? can it be removed and tested?? what fuse supplies power to kickdown relay? My workshop manuals speak of the solenoid valve, but never show it, or tell where its located!
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1985 944
Old 03-25-2008, 04:54 PM
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No...the actual solenoid valve in the transmission that your pictured switch powers. thank you.. J
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Old 03-26-2008, 05:21 AM
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Do you have a picture of it for the transmission side?
Old 03-26-2008, 08:50 AM
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There is no fuse for this on your year - though there is on later cars. You can test that the relay has power - unplug it and test that you have 12v+ on the 30 terminal in the socket when the accelerator is in kickdown position. if you don't its likely a kick-down switch problem.

Also test the relay out of the car - do you have continuity between the 30 & 87a terminals - default should be that these are connected - if they aren't you have a relay problem (disables any kick-down)

The relay & switch are in series - the relay opening causes a transmission up-shift not the kick down. The switch alone activates the kick down - if kick-down stays active till the revs are close to the redline then the relay opens briefly to cause the high rpm up-shift.

You can test (very carefully) without the relay by jumping the 30 & 87a terminals. Verify only that the car will downshift from 2 to 1 with kickdown - do not hold kickdown in 1 until redline because the car won't up-shift properly (in kick-down mode) without the relay.

If this works the solenoid is OK and the relay is suspect. Its a special relay.

Alan
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Last edited by Alan in AZ; 03-26-2008 at 11:52 AM..
Old 03-26-2008, 11:48 AM
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I need to troubleshoot my KD. I have an 83 and was wondering what the Relay part number is?
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Old 03-30-2011, 01:09 PM
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Well found the part number for the Relay on 928 Specialists chart
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Old 03-30-2011, 04:34 PM
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Well found the part number from 928 Specialists posted charts

928.618.109.00

I need help troubleshooting and don't want to buy a $60 Relay if mine is good.

I wanted to make sure I got power to the switch (under pedal) and I got power when key is on, no power when key is not on.

Key "On" and depressing Switch, I am not hearing anything in the Relay or Kickdown Solenoid area (Tranny).

Can anyone help with further Troubleshooting?
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Old 03-30-2011, 04:37 PM
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Hi Leo,

Are you sure your trans uses a kickdown relay on the 83? I've been beating myself up over this issue also. According to my 1983 owners manual there is not a callout for a kickdown relay nor fuse. IIRC, the kickdowns started on model year 1984. Most shops group the model years 83 & 84 as the same.
I'm not sure if you have the manual so see below. PET 7.1 screenshot is the bottom picture which does call out a relay............your dilemma is also mine........




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Last edited by garylewa; 03-30-2011 at 11:00 PM..
Old 03-30-2011, 10:45 PM
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PET 7.1 SCREENSHOT: See red highlight band. IX was listed as not connected in the owners manual but clearly shows a relay here now. 1984 PET 7.1 shows the same thing as below.

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Old 03-30-2011, 11:01 PM
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Here's something else to digest Leo; attached are the relay and fuse panel layout screenshots from the 1984 owner's manual. I kept the "1984" in the upper left of both screenshots for reference. There is nothing called out for relay IX. These manuals may have been printed before the circuitry was finalized but I would think Porsche would've included it in '84 manual.........




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Old 03-30-2011, 11:22 PM
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Here are the current flow diagrams from the WSM's. The first diagram is from the fourth page and the bottom diagram was an additional current flow diagram which plainly calls out a relay in slot IX.........



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Old 03-30-2011, 11:35 PM
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This should help.
Gary, I don't know what else is out there on documentation, we seem to have found a lot.
Maybe WSM has more.

Introduced with 4spd automatic in 83, both 83 and 84 have the relay
The bridge is for manual.



Kickdown relay or kickdown speed relay, interrupts kickdown at high RPM. I've heard others say it doesn't prevent kickdown, just interrupts it to prevent overrevving, but am not sure.

Make sure your switch under the pedal works.
Make sure the solenoid fires under the back of the transmission (near cross member)
With key on, pressing gas pedal deep onto floor should activate the solenoid and you should hear a click in the back of the car.
If not, check the power to the switch and the power to the harness in the back of the car through the switch (break harness at solenoid, with voltmeter see if you have power with key on and somebody pressing pedal, after you know the switch itself works).
You can as a final check apply 12V directly to solenoid and listen for it to click.




The A28 transmission manual for the 928 has a simple procedure for checking kickdown function.









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Last edited by Landseer; 03-31-2011 at 03:08 AM..
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A28 manual info for kickdown for new 4 speed auto





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Old 03-31-2011, 03:01 AM
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Thanks for the charts Landseer; so my thinking is that Porsche mass produced the owners manuals before circuit finalization; would you agree? And by following the circuit in the schematics we all should be fine, correct?
During my resto I followed PET for my fuse panel "clean up" and there was not a relay in the IX spot; I put one in there though.
Since I've had this car I 've always wondered if a relay belongs in the IX spot; this helps. Thanks again.
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Old 03-31-2011, 09:06 AM
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I have a feeling my problem will lie in the Solenoid. Can't check this until I can crawl under the car.
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Old 03-31-2011, 09:13 AM
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Might be able to isolate which harness wires feed it and jumper them from the CE panel.

May not be any easier.
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Old 03-31-2011, 09:27 AM
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Quote:
Originally Posted by Alan in AZ View Post
There is no fuse for this on your year - though there is on later cars. You can test that the relay has power - unplug it and test that you have 12v+ on the 30 terminal in the socket when the accelerator is in kickdown position. if you don't its likely a kick-down switch problem.

Also test the relay out of the car - do you have continuity between the 30 & 87a terminals - default should be that these are connected - if they aren't you have a relay problem (disables any kick-down)

The relay & switch are in series - the relay opening causes a transmission up-shift not the kick down. The switch alone activates the kick down - if kick-down stays active till the revs are close to the redline then the relay opens briefly to cause the high rpm up-shift.

You can test (very carefully) without the relay by jumping the 30 & 87a terminals. Verify only that the car will downshift from 2 to 1 with kickdown - do not hold kickdown in 1 until redline because the car won't up-shift properly (in kick-down mode) without the relay.

If this works the solenoid is OK and the relay is suspect. Its a special relay.

Alan
These are good tests which I plan on doing at some point.
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Old 03-31-2011, 09:31 AM
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Old 03-31-2011, 09:31 AM
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