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Re: Throttle switch wires Posted by Gary Stottler [Email] (#1463) [Profile/Gallery] (more from Gary Stottler) on Sun, 8 Jun 2014 07:55:20 In Reply to: Re: Throttle switch wires, don wollum, Sun, 8 Jun 2014 03:47:08 Members do not see ads below this line. - Help Keep This Site Online - Signup |
Justin,
I think that the 3rd terminal Don is referring two was a "piggy back" terminal that would add another male terminal to an existing connection. I am not sure what that was for. My car at this point has only two terminals (and two wires - the wiring diagram in the manual only shows 2), which is consistent with the simple "normally open" switch. The switch is actuated by a "cam" on the end of the throttle shaft. The switch is open (not activated)up to about 3/4 throttle and then it is closed (activated) from there up to wide open. If I did it right, you can see a picture here of the switch in the open position, you can also follow this link at see it in the closed position:
http://s974.photobucket.com/user/stottler/media/Saabs/Saab%2099%20Turbo%20Engine%20rebuild/LambdaThrottleswitchclosed.jpg.html?sort=3&o=0
There are two wires - the red one goes to the terminal on the side of the switch (towards the back of the car) and they brown one to the terminal on the bottom of the switch. The brown (circuit 359) goes to ground and the red (circuit 355) goes to the Lambda control module under the passenger seat. Don is correct, an ohmmeter should show the switch open when not actuated, and closed (0 ohms) when actuated. At the system level, with the fuel and lambda system running with the engine off (jumper wire across the fuel pump relay socket), you should see the pulse relation at 50% with the switch open and it should jump to 80% when the switch is closed. This is your assurance that you are getting the proper enrichment at high throttle/boost conditions.
Hope that helps!
Gary
_______________________________________ Gary Stottler
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