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Thread: How to test Vr T5 Speed Sensor / Speedo on instrument cluster after manual conversion

  1. #1
    BE39ER's Avatar
    BE39ER is offline More Torque Less Traction
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    94 VR Commodore Berlina just converted to manual

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    Default How to test Vr T5 Speed Sensor / Speedo on instrument cluster after manual conversion

    Hey guys, I recently converted my Vr auto to a T5 manual and cant get my speedo working. I purchased a Manual ECU with a performance chip and all the wiring and very detailed info and pics to get the speedo / reverse lights working. Ive hooked it all up and still no speedo. The colours of the wires coming off my speed sensor on the gearbox have faded very badly and I cant really tell what colours they were origionaly. I am not sure if there could be a problem with the speedo on the cluster (prolly not as it worked as an auto) or a problem with the speed sensor on the T5. Which brings me to my first question. Would anyone out there possibly have a pic of the sensor that clearly shows the colours of the wires coming out of the head of the sensor? And also, is there a way to individually test the speed sensor and the speedo on the cluster? I have a multimeter but not sure how to approach it. I was thinkin of rigging up the sensor to a battery, and wrapping a small peice of cloth around the spline and gently attatching it to a cordless drill and giving it a whirl. But as I said I am not sure ifI have the colous on the sensor mixed up and dont want to short anything out. I have a bald spot from scratching my head so much and I have rego at the end of January. Someone please throw me a bone Cheers guys

  2. #2
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    im pretty sure u can setup an OHM metre on the speedo terminals and spin it up with ur hands to see if the speedo drive is working ok, as for wiring, look for a wiring diagram and go from there :>

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    is there a way to individually test the speed sensor and the speedo on the cluster
    Yes:

    White/blue.......... Earth
    Pink/blue.............12 volt accessories
    Purple/white......to speedo side of ECU

    With the sensor disconnected from the car harness at the plug, battery voltage connected to the P/B wire and the W/B connected to earth on the sensor pigtail, a test light between battery voltage and the P/W wire should switch between on and off (earthed and not earthed) as the sensor is rotated - by hand will do.


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