How To Test The CKP Sensor (2002-2004 4.2L Oldsmobile Bravada, 2004-2007 Buick Rainier)

TEST 2: Testing The CKP Sensor's Output With A Multimeter

Testing The CKP Sensor's Output With A Multimeter. How To Test The CKP Sensor (2002, 2003, 2004 4.2L Oldsmobile Bravada And 2004, 2005, 2006, 2007 Buick Rainier)

As you're probably already aware, the CKP sensor is a two wire magnetic pulse generator type of sensor.

So as the engine is cranking or running, it produces and AC voltage signal.

You and I can confirm that the CKP sensor is producing this AC voltage signal and I'll explain how in the test instructions.

As I've mentioned before, what complicates the CKP sensor's performance test is its location. I use a pigtail connector (like the one in the image above) to connect my multimeter test leads to the CKP sensor.

I'm going to recommend that you use a pigtail connector to performance-test the CKP sensor also. You can get a pigtail connector from your local junkyard, auto parts store or you can buy one online here: ACDelco GM Original Equipment PT2437 Pigtail (at:

IMPORTANT: The battery must be fully charged to get the most accurate result from this test.

These are the test steps:

  1. 1

    Disconnect the CKP sensor from its electrical connector.

    LOCATION: The CKP sensor's connector is located on the right side of the intake manifold (near fuel injector #1).

  2. 2

    Connect the pigtail connector to the CKP sensor (the one you bought online or at your local auto parts store).

  3. 3

    Place your multimeter in Volts AC mode.

  4. 4

    Connect one of the multimeter test leads to one of the pigtail connector's wires.

    It doesn't matter which multimeter test lead (red or black) you connect to this wire.

  5. 5

    Connect the other multimeter test lead to the other pigtail connector's wire.

  6. 6

    Have a helper crank the engine as you observe the multimeter.

    CAUTION: Be careful and stay alert as the engine is cranking.

  7. 7

    The multimeter should report an AC voltage that will oscillate somewhere around 0.4 to 1.2 Volts AC.

Let's interpret your test results:

CASE 1: The multimeter reported the indicated AC voltage. This test result confirms that the CKP sensor is functioning correctly.

CASE 2: The multimeter reported 0 AC voltage. This test result confirms that the crankshaft position sensor is bad and needs replacement.

More 4.2L Oldsmobile Bravada And Buick Rainier Tutorials

You can find a complete list of 4.2L Oldsmobile Bravada and Buick Rainier tutorials and wiring diagrams here:

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Buick Vehicles:

  • Rainier 4.2L
    • 2004, 2005, 2006, 2007

Oldsmobile Vehicles:

  • Bravada 4.2L
    • 2002, 2003, 2004