How to Test the Crank Sensor -No Spark
No Start Tests (Chrysler 3.0L, 3.3L, 3.8L)

CKP TEST 2: Verifying Power (5 or 8 Volts)

In this test step, you're gonna' verify that the crank sensor is getting power.

As mentioned earlier... this power can come in the form of either 8 Volts or 5 Volts (depending on what year your specific vehicle is). Don't worry about what specific voltage your specific vehicle should output... since it will be either one or the other.

IMPORTANT: Take care no to short this wire to power (12 volts) or you'll fry the PCM, since it's the PCM that provides this ground internally.

  1. 1

    With your multimeter still in Volts DC mode, probe the wire identified with the number 3 in the image viewer, with red multimeter lead. Do not probe the front of the crank sensor connector to verify this voltage. Pierce the wire with an appropriate tool.

  2. 2

    Ground the Black lead of the multimeter to a good ground point on the engine.

  3. 3

    When everything is set up, have you helper turn the key to the On position.

  4. 4

    If all is good with this circuit, your multimeter should register 5 or 8 Volts.

OK, let's interpret the multimeter test results you just obtained. Choose from the CASES below that best match your specific results:

CASE 1: The multimeter registered 5 or 8 Volts DC when the key was turned On. This let's you know that the CKP sensor is being fed with power (8 Volts) from the PCM. There is still one more test to do, before we can condemn the crank sensor as BAD, and that is to test the ground circuit. Go to CKP TEST 3

CASE 2: The multimeter DID NOT register 5 or 8 Volts DC when the key was turned On, recheck your connections and try the test again...

If the multimeter still does not register 8 Volts, then this result let's you know that the reason there was no On/Off 5 Volt signal, registered in TEST 1, is because the crankshaft position (CKP) sensor is not getting power. You have now eliminated the crank sensor as the cause of the No Start Condition.

Solving the issue that is causing these missing 5 or 8 Volts will solve the No Start Condition of your 3.0L, 3.3L, 3.8L Chrysler equipped car or mini-van.

CKP TEST 3: Verifying Ground

The crank sensor also needs a ground to function and create a crank signal...

...So, in this test step, you're going to verify that the crankshaft position sensor is getting ground. As mentioned earlier, the ground path is completed inside the PCM.

IMPORTANT: You got to be very careful not to short this wire, since you run the risk of damaging the PCM. Also, do not use a test light to verify this voltage... use a multimeter.

OK, this is what you need to do:

  1. 1

    With your multimeter still in Volts DC mode, probe the wire identified with the number 2 in the image viewer, with black multimeter lead. Do not probe the front of the crank sensor connector to check this ground. Pierce the wire with an appropriate tool.

  2. 2

    Connect the Red lead of your multimeter to the battery positive terminal.

  3. 3

    When everything is set up, have you helper turn the key to the On position.

  4. 4

    If all is good with this circuit, your multimeter should register battery voltage (12+ Volts).

Choose from the CASES below that best match your specific results:

CASE 1: The multimeter registered 12 Volts DC when the key was turned On. Then the CKP sensor is getting a good ground. This results confirms that the crankshaft position (CKP) sensor is BAD. Replace the CKP sensor.

Here's why: A good working CKP sensor, when it receives power and ground and the engine is cranking... will generate an On/Off 5 Volt signal. Now, in your particular case, in TEST 1 you verified the CKP sensor is not creating it's On/Off 5 Volt signal. In TEST 2 you confirmed that it's being fed with power (5 or 8 Volts) and in this test step, you have verified that it's getting a good ground... therefore the CKP sensor is BAD. Replace the CKP sensor.

CASE 2: The multimeter DID NOT register 12 Volts DC when the key was turned On, recheck your connections and try the test again...

If the multimeter still does not register 12 Volts, then this result let's you know that the CKP does not have a good sensor ground. You have now eliminated the crank sensor as the cause of the No Start Condition, since without this ground, the CKP sensor will not work.



Chrysler Vehicles:

  • Town and Country 3.3L, 3.8L
    • 1998, 1999, 2000

Dodge Vehicles:

  • Caravan 3.0L, 3.3L, 3.8L
    • 1998, 1999, 2000
  • Grand Caravan 3.0L, 3.3L, 3.8L
    • 1998, 1999, 2000

Plymouth Vehicles:

  • Grand Voyager 3.0L, 3.3L, 3.8L
    • 1998, 1999, 2000
  • Voyager 3.0L, 3.3L, 3.8L
    • 1998, 1999, 2000

“Don’t worry about avoiding temptation. As you grow older, it’ll avoid you.”
Joey Adams

MORE TUTORIALS: