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Thread: Simple Injector Signal Tester

  1. #1
    Alps Adventurer GlobalRider's Avatar
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    Simple Injector Signal Tester

    I made this very simple tester so that I could determine if my condenser fan and oil cooler fan was in either low or high speed mode in my car while I was driving. Actually, it can be used for just about any test.

    Having just read this month's Bench Wrenching article "Troubleshooting - The Art of Critical Thinking, Paul wasn't easily able to check if there was a signal going to the injectors.

    Well I just happened to check the injectors on a local's Porsche 911 the other week. The owner installed an Electromotive TecGT engine control system and it wasn't running right; injector #5 wasn't getting a signal at all and injector #3 was intermittent. The problem...the AMPSEAL connector...brand new and faulty right off the bat. The LED's flashed nicely on all other cylinders. And this simple tester avoided having to drag my oscilloscope over to his place.

    Anyway, this or better yet, a version of it, can be stashed away in your took kit. A simple LED, resistor, some short leads and two pins can be put into a 1"x 2" zip lock bag. The pins are used to slide down the injector connector to make contact with them. My unit has banana jack receptacles so that I can use my test leads with it.

    A bright LED should be chosen along with an appropriate series resistor.



  2. #2
    Benchwrenching PGlaves's Avatar
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    Radio Shack and other electrical supply places sell 12v LEDs with proper resistance built in. I used them for a tester I made to test Hall Effect Sensors (HES). Voni carries a 12v LED tester in her tool kit now.

    But the episode described in that Benchwrenching column happened at a time, and at a location that I had neither of these devices at my immediate disposal.
    Last edited by PGlaves; 08-01-2013 at 01:14 PM.
    Paul Glaves - "Big Bend", Texas U.S.A
    "The greatest challenge to any thinker is stating the problem in a way that will allow a solution." - Bertrand Russell
    http://www.bigbend.net/users/glaves

  3. #3
    Alps Adventurer GlobalRider's Avatar
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    Quote Originally Posted by PGlaves View Post
    Radio Shack and other electrical supply places sell 12v LEDs with proper resistance built in.
    Even easier! I made mine from stock I had in my shop. I'll get one of those ready-made LEDs for the one I'll keep in my toolkit.

    Quote Originally Posted by PGlaves View Post
    But the episode described in that Benchwrenching column happened at a time, and at a location that I had neither of these devices at my immediate disposal.
    Well that'll learn ya. I'll be putting one in my toolkit.

  4. #4
    2011 R1200RT ka5ysy's Avatar
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    Schematics ???
    Doug, 2011 R1200RT Polar Metallic
    MSF #127350 NAUI #36288

  5. #5
    Alps Adventurer GlobalRider's Avatar
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    Quote Originally Posted by ka5ysy View Post
    Schematics ???
    A simple LED in series with a resistor; in my case, a 2K ohm resistor for the LEDs that I had.

    Or you can go Paul's route and get the all-in-one-package 12V LEDs. That is easier.

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