How To Test The CKP Sensor -P0320, P0335, P0339 (2002-2010 4.7L V8 Dodge Ram Pickup)

TEST 2: Making Sure The CKP Sensor Is Getting 5 Volts

If you didn't see the correct ON/OFF voltage in the last test, the next step is to make sure the PCM is actually supplying 5 Volts to the crankshaft position (CKP) sensor.

If this 5V power is missing, the sensor can't produce a signal —which will cause P0320, P0335, or P0339 codes and leave you with an engine no-start problem to boot.

On the 4.7L V8 Ram pickup, the 5 Volt supply comes in through terminal 1 of the CKP sensor connector. Specifically:

• 2002–2003: orange (ORG) wire.
• 2004–2010: pink with yellow stripe (PNK/YEL) wire.

Here's how to check it:

1. 1

   Disconnect the CKP sensor connector.

2. 2

   Set your multimeter to DC Volts.

3. 3

   Connect the black multimeter lead to the battery negative (-) post.

4. 4

   Turn the ignition key to ON (engine OFF).

5. 5

   Probe female terminal 1 on the connector with your red multimeter lead.
   
   NOTE: Double-check that terminal 1 actually connects to the PNK/YEL (or ORG) wire.

6. 6

   Your multimeter should register 4.5 to 5.0 Volts.

Alright, let's find out what it all means:

CASE 1: 4.5 to 5 Volts present. Perfect. This confirms that the PCM is sending power to the CKP sensor.

Next, move on to TEST 3: Making Sure The CKP Sensor Is Getting Ground.

CASE 2: 0 Volts. Recheck your test setup and repeat the test.

If you still have 0V, there could be an open-circuit or break in the PNK/YEL (or ORG) wire between the PCM and sensor.

That wiring fault will need to be located and repaired —without power, the sensor cannot function and will continue to trigger P0320, P0335, or P0339.

TEST 3: Making Sure The CKP Sensor Is Getting Ground

So far, here's what you've already checked:

• TEST 1: No ON/OFF switching signal from the CKP sensor.
• TEST 2: PCM is providing 5 Volt power to the sensor.

The final piece of the puzzle is to confirm that the crankshaft position sensor has a proper Ground —without a good Ground, the sensor can't function and the PCM will set P0320, P0335, or P0339 codes.

This Ground is provided straight from the PCM through terminal 2 of the sensor connector. Specifically:

• 2002-2003: black with light blue stripe (BLK/LT BLU) wire.
• 2004-2010: dark blue with dark green stripe (DK BLU/DK GRN) wire.

IMPORTANT: Never apply voltage to this wire —doing so can instantly fry the PCM. We're gonna confirm the presence of Ground in the wire by doing a safe and simple multimeter voltage test.

Here's how to check the Ground circuit:

1. 1

   Disconnect the CKP sensor connector.

2. 2

   Set your multimeter to DC Volts mode.

3. 3

   Connect the red multimeter lead to the battery positive (+) terminal.

4. 4

   Turn the ignition key to ON (engine OFF).

5. 5

   Touch the black multimeter lead to terminal 2.
   
   NOTE: Double-check that terminal 2 connects to the DK BLU/DK GRN (or BLK/LT BLU) wire.

6. 6

   You should see 10 to 12 Volts on the multimeter.

Let's interpret your test result:

CASE 1: 10 to 12 Volts displayed. This is the correct test result.

This means the PCM Ground path is good. If power and Ground are both confirmed (TEST 2 and this one) but no CKP signal is present (TEST 1), then the sensor has failed internally and needs to be replaced.

Replacing the CKP sensor should get the engine back up and running and clear those P0320, P0335, or P0339 codes.

CASE 2: No voltage (0V). Double-check your multimeter setup and connections and retest.

If you still see no voltage, you may have an open or damaged Ground wire between the PCM and the CKP sensor. This wiring fault must be repaired before the sensor can function properly.

More 4.7L V8 Dodge Ram Pickup Tutorials

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• 4.7L V8 Dodge Ram Pickup Index Of Articles.