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G65 wiring test

Discussion in 'Air Conditioning' started by whinfs, Jul 9, 2013.

  1. whinfs
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    whinfs Member

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    Evening
    ECON light permanently on. I went to have my a/c regassed at a local auto elec. he informed me there was a fault with the pressure sensor and i would have to return another day to leave the car to have the wiring to the sensor checked, new sensor fitted and regassed for £200. ouch.

    ive got a multimeter - can i unplug the sensor and see what voltages are present? if so should the engine be running and what voltages should be there?

    i really cant afford £200....

    cheers
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  2. Chillout
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    Chillout Member

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    Your sensor should just unscrew and the schrader valve core should hold the charge unless the core has been removed or leaks
    unscrew it very slowly you will get a little hiss but it should stop before it runs out of threads.
    Last edited: Jul 10, 2013
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  3. whinfs
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    whinfs Member

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    thanks for the reply. i plan on doing that but it was wondering can i test the electrical side i.e. the plug to make sure voltages are there
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  4. Chillout
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    Chillout Member

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    Yes it can be done terminal 1 is at the square end it is the ground/negative terminal 2 is in the middle and sends a square wave to the ecu that can be measured with a scope terminal 3 is the positive round end

    i would assume it is faulty if your system is not choked or overcharged hope this helps.
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