TEST 1: Verifying The Crank Sensor Is Getting Power

Verifying The Crank Sensor Is Getting Power. How To Test The Crankshaft Position Sensor (1994-2004 3.0L V6 Mitsubishi Montero)

The first thing we want to do to find out if the crankshaft position sensor is bad (or not) is to make sure it's getting power.

This power is in the form of battery voltage (12 Volts DC) and is supplied by the RED wire that connects to connector terminal labeled with the number 3 in the illustration above.

NOTE: Avoid probing the front of the female terminal (of the connector) with the multimeter's test lead (or you run the risk of damaging the female terminal). My suggestion to you is to use a back-probe or a wire-piercing probe to test for this voltage.

Here are the test steps:

  1. 1

    Place your multimeter in Volts DC mode.

  2. 2

    Disconnect the crankshaft position sensor from the engine wiring harness connector.

    IMPORTANT: This test is done on the engine wiring harness crank sensor connector and NOT on the sensor's connector. You can further identify the engine wiring harness connector by the fact that it has female terminals.

  3. 3

    Connect the red multimeter test lead to the RED wire of the crank sensor's engine wiring harness connector using an appropriate tool.

    The RED wire connects to the terminal labeled with the #3 in the illustration above.

  4. 4

    Connect the black multimeter test lead to the battery's negative terminal.

  5. 5

    Have your assistant turn the key to the On position but without cranking the engine.

  6. 6

    Your multimeter should register 10 to 12 Volts if the RED wire is feeding the crankshaft position sensor with power.

Let's interpret your test results:

CASE 1: The multimeter showed 10 to 12 Volts. This is the correct test result and lets you know all is good in this circuit and the CKP sensor is getting power.

The next step is to make sure its Ground circuit is OK too, go to: TEST 2: Verifying The Crank Sensor Is Getting Ground.

CASE 2: The multimeter DID NOT show 10 to 12 Volts. This indicates that the CKP sensor is not getting power. Without 10 to 12 Volts, the CKP sensor will not work and your Mitsubishi vehicle will ‘crank but not start’.

Although it's beyond the scope of this tutorial, your next step is to find out why this voltage is missing and restore it to solve your Montero's no start condition.

TEST 2: Verifying The Crank Sensor Is Getting Ground

Verifying The Crank Sensor Is Getting Ground. How To Test The Crankshaft Position Sensor (1994-2004 3.0L V6 Mitsubishi Montero)

So far, you've confirmed that the crankshaft position sensor is getting power (TEST 1). Now we need to make sure that it's getting Ground.

The wire that feeds this Ground to the crank sensor is the black (BLK) wire of the engine wiring harness crank sensor connector. This wire connects to the terminal labeled with the number 1 in the illustration above.

NOTE: Avoid probing the front of the female terminal (of the connector) with the multimeter's test lead (or you run the risk of damaging the female terminal). My suggestion to you is to use a back-probe or a wire-piercing probe to test for the presence of Ground in the wire.

This is what you need to do:

  1. 1

    Place your multimeter in Volts DC mode.

  2. 2

    Disconnect the crankshaft position sensor from the engine wiring harness connector.

    IMPORTANT: This test is done on the engine wiring harness crank sensor connector and NOT on the sensor's connector. You can further identify the engine wiring harness connector by the fact that it has female terminals.

  3. 3

    Connect the black multimeter test lead to the BLK wire of the crank sensor connector. This is the wire that connects to the female terminal identified with the number 1 in the illustration above.

  4. 4

    Connect the red multimeter test lead directly on the battery's positive (+) terminal.

  5. 5

    Your multimeter should register 12 Volts with or without the Key in the On position (if the BLK wire is feeding the crank sensor with Ground).

Let's interpret your test results:

CASE 1: The multimeter showed 10 to 12 Volts. This is the correct test result and confirms all is good in this circuit and the CKP sensor is getting Ground.

The next step is check that the crank sensor is creating a crankshaft position signal, go to: TEST 3: Verifying The Crank Sensor Is Creating A Crankshaft Position Signal.

CASE 2: The multimeter DID NOT show 10 to 12 Volts. This indicates that the CKP sensor is not getting Ground. Without Ground, the CKP sensor will not work and your Mitsubishi Montero will ‘crank but not start’.

Altho' it's beyond the scope of this tutorial, your next step is to find out why this Ground is missing and restore it. Repairing the cause of this missing Ground should solve your vehicle's no start problem.

Mitsubishi Vehicles:

  • Montero Sport 3.0L
    • 1997,
      1998,
      1999,
      2000,
      2001,
      2002,
      2003,
      2004