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-   -   91 crx with no power to the ecu (https://www.askmehelpdesk.com/showthread.php?t=539980)

  • Jan 2, 2011, 07:08 PM
    shifty86
    91 crx with no power to the ecu
    I've tried 3 diff main relays is there a inline fuse on the harness for the main relay somewhere??
  • Jan 3, 2011, 08:16 AM
    TxGreaseMonkey

    . Clean the main ECM ground, located on the thermostat housing.

    . Test all under hood and under dash fuses with a test light or multimeter:

    https://www.askmehelpdesk.com/cars-t...tml#post252145
  • Jan 3, 2011, 10:04 AM
    shifty86
    Comment on TxGreaseMonkey's post
    The ground looks good and I tested under the dash and all seams to be good. I put a Test light on all the wires to the ecu and no power
  • Jan 3, 2011, 10:26 AM
    TxGreaseMonkey
    . Test all under hood fuses, too--particularly the Back-Up Fuse going to the ECM.

    . Perform the K-Test on the ECM.

    The K-Test: Remove the MAP Sensor connector and turn the ignition switch to ON (Position II). Using a multimeter, check for 5 volts going between the MAP Sensor connector's reference wire (+) and ground. As you look at the connector, this is the socket on the right. Really press the black test lead into a cleaned main ECM ground on the thermostat housing. If the voltage is low, it's probably indicating ECM failure. Most failed ECMs will record a fraction of a volt. To me, the K-Test is simple, elegant, and accurate. Many Hondas parked for several years are now back on the road. "The K-Test creates massive value, by providing a low cost solution where one did not previously exist."--TxGM

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