 What does this switch do on my Motronic Unit?, Not even the po knows |
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| Thunderchief |
 Jan 22 2026, 04:23 PM
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#1
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Member  Group: Members Posts: 197 Joined: 12-August 19 From: Pasadena, CA. Member No.: 23,365 Region Association: Southern California  |
This switch on the side of the Motonic Unit for my 3.6 swap has 3 positions but not sure why or what it does. Thanks.
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Replies(1 - 9)
| burton73 |
Jan 22 2026, 06:41 PM
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#2
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Senior member, and old dude Group: Members Posts: 3,977 Joined: 2-January 07 From: Los Angeles Member No.: 7,414 Region Association: Southern California 
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Not stock
Best Bob B |
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| tomeric914 |
Jan 22 2026, 07:17 PM
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#3
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One Lap of America in a 914! Group: Members Posts: 1,319 Joined: 25-May 08 From: Syracuse, NY Member No.: 9,101 Region Association: North East States
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Maybe a way to disable the car as a theft deterrent? Only real way to find out is to pull the cover.
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| Steve |
Jan 23 2026, 08:46 AM
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#4
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914 Guru Group: Members Posts: 6,025 Joined: 14-June 03 From: Laguna Niguel, CA Member No.: 822 Region Association: Southern California
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Not stock…. You will need to open it up and see what it’s connected to. Could be the immobilizer or ? Since my Motor was from a tiptronic, I had to cut a wire to tell it my car is a manual.
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| Thunderchief |
Jan 25 2026, 11:11 AM
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#5
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Member Group: Members Posts: 197 Joined: 12-August 19 From: Pasadena, CA. Member No.: 23,365 Region Association: Southern California |
Here is is from the inside. Again its a 3 position switch so I'm wondering what the positions are for. Thanks everyone!
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| Superhawk996 |
Jan 25 2026, 11:42 AM
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#6
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914 Guru Group: Members Posts: 7,734 Joined: 25-August 18 From: Woods of N. Idaho Member No.: 22,428 Region Association: Galt's Gulch
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Flick it - what happens?
3 position irrelevant - only two wires so it’s acting as on/off. |
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| mepstein |
Jan 25 2026, 11:57 AM
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#7
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914-6 GT in waiting Group: Members Posts: 20,534 Joined: 19-September 09 From: Landenberg, PA/Wilmington, DE Member No.: 10,825 Region Association: MidAtlantic Region
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Send a pic to pcarsba@gmail.com
Ingo Schmidt repairs motronic ecu’s and knows them inside out. Super nice guy. I’ve had about 10 ecu repaired by him. Some that steve Wong told me were toast. |
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| Thunderchief |
Jan 25 2026, 11:59 AM
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#8
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Member Group: Members Posts: 197 Joined: 12-August 19 From: Pasadena, CA. Member No.: 23,365 Region Association: Southern California |
Thanks. It does have an aftermarket chip if that makes a difference
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| Cairo94507 |
Jan 26 2026, 10:11 AM
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#9
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Michael Group: Members Posts: 10,590 Joined: 1-November 08 From: Auburn, CA Member No.: 9,712 Region Association: Northern California
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I agree with Tomeric914; likely a kill switch. (IMG:style_emoticons/default/beerchug.gif)
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| ClayPerrine |
Jan 26 2026, 02:03 PM
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#10
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Life's been good to me so far..... Group: Admin Posts: 16,542 Joined: 11-September 03 From: Hurst, TX. Member No.: 1,143 Region Association: NineFourteenerVille
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I know the 964 had a jumper to change fuel map when you are forced to run cheap gas. That may be wired up to change the fuel map.
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