Wednesday, June 8, 2011

how to test crankshaft sensor with meter on chevrolet car?

  • Check the crankshaft sensor for an out-of-range or irregular signal by connecting the computer scanner to the electrical plug on the sensor. Place the scanner in the right mode by inserting the year, make and engine size into the computer. Rotate the knob down to "Crankshaft sensor." Press "OK." Underline the signal integrity graph test and press "OK." There are three wires in the connector. One of the outside terminals is the battery voltage, the center terminal is the PCM, and the opposite side is the sensor signal. Place the red lead on the sensor signal and the black lead to a good ground.

  • Start the engine and watch the graph. There should be squared-off spikes shaped like buildings. They should all be equal heights and evenly spaced. Look for intermittent irregularities or drop-outs indicative of a failing sensor. Rotate the computer knob until it underlines frequency and press "OK." Watch the average frequency and duty cycle. Compare it with the displayed data at the bottom of the screen. The data shows the correct and usable amount of deviation. If the real-time parameters are other than indicated as usable, a failure is imminent.

  • Check the crankshaft sensor for a no-signal situation with the scanner or the volt/ohmmeter. Pull the electrical connector off the sensor. Turn the ignition switch on and test the connector for battery voltage. If no voltage is present, the problem is wiring. If the voltage is present, reconnect the plug. With the key still on, check the center wire with the engine off. The reading on the voltmeter should be less than 100mv. If it reads other than this, replace the sensor.

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  • disconnect the ignition coil module turn key on and check for what voltage you have at terminal A PINK wire and terminal D WHITE/BLACK wire.

    make sure with the key on you have voltage at the pink wire at the CRANK sensor

    yes disconnect and with the key on probe the pink wire at the crank sensor and see if you have voltage. it is a DC test on the pink wire

    you should have 12 volts DC at that pink wire
    the crankshaft sensor is 3 wire. 1 the pink wire on the connector reads 12 volts the other 2 wires

    the 1 outside wire and terminal is 12 v DC. with key on

    the other outside reads 0-3.5 volts AC it cycles as we crank

    plug that back in and go back up to the module on the bracket.put your meter on AC voltage put the black lead to ground and the red lead to WHITE wire crank it and see if you have AC voltage jumping from 1 to 4 volts when cranking it over.

    And test the sensor.if there is no voltage at pink wire with key on.Then its faulty sensor and has to be replace.

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