The camshaft position (CMP) sensor is located in the distributor on the 1992-1997 3.9L V6 Dodge Dakota. And testing it is not hard.
In this tutorial, I'm gonna' show you how to test it using a multimeter. With your test results you'll be able to easily find out if it's defective or not.
NOTE: The camshaft position sensor is also known as the distributor pickup coil.
Contents of this tutorial:
- Symptoms Of A Bad Camshaft Position (CMP) Sensor.
- Circuit Descriptions Of The Camshaft Position Sensor.
- Where To Buy The Camshaft Position Sensor.
- TEST 1: Testing The Camshaft Position Signal.
- TEST 2: Making Sure The CMP Sensor Has Power.
- TEST 3: Making Sure The CMP Sensor Has Ground.
- More 3.9L Dodge Dakota Tutorials.
APPLIES TO: This tutorial applies to the following vehicles since they use the exact same camshaft position (CMP) sensor:
- 3.9L V6 Dodge Dakota: 1992, 1993, 1994, 1995, 1996, 1997.
IGNITION COIL TEST: The following tutorial will help you test the ignition coil: How To Test The Ignition System (1992-1997 3.9L Dodge Dakota).
WIRING DIAGRAM: You can find the ignition system wiring diagrams here:
- Ignition System Circuit Diagram (1992-1993 3.9L Dodge Dakota).
- Ignition System Circuit Diagram (1994-1995 3.9L Dodge Dakota).
- Ignition System Circuit Diagram (1996 3.9L Dodge Dakota).
- Ignition System Circuit Diagram (1997-1999 3.9L Dodge Dakota).
Symptoms Of A Bad Camshaft Position (CMP) Sensor
The fuel injection computer, on your 1992-1997 3.9L Dodge Dakota uses the camshaft position (CMP) sensor signal in combination with the crankshaft position (CKP) sensor signal to start injecting fuel.
The fuel injection computer also needs the CMP signal to start activating the ignition coil. So when the camshaft position sensor fails, the engine is not gonna' start due to a lack of spark and a lack of fuel injection.
In most cases, when the camshaft position sensor fails, the fuel injection computer will set a trouble code. If it does, you'll see a:
- Code 54: No Camshaft Sync Signal At PCM (1994-1995 OBD I system).
- P0340: No Camshaft Signal At PCM (1996-1997 OBD II system).
If you have a code reader or a scan tool, check for codes. To test the actual camshaft position sensor, a scan tool is not required.
Circuit Descriptions Of The Camshaft Position Sensor
The camshaft position sensor has 3 wires coming out of its electrical connector. One wire supplies power. One wire supplies Ground. And the other wire carries the CMP signal to the fuel injection computer.
In the tables below you'll find a short description of each of the 3 wires:
| 1992-1995 Camshaft Position Sensor Connector | ||
|---|---|---|
| Pin | Wire Color | Description |
| 1 | Orange (ORG) | Power (8 Volts DC) |
| 2 | Black with light blue stripe (BLK/LT BLU) | Sensor Ground |
| 3 | Gray with black stripe (GRY/BLK) | CMP Signal |
| 1996-1997 Camshaft Position Sensor Connector | ||
|---|---|---|
| Pin | Wire Color | Description |
| 1 | Violet with white stripe (VIO/WHT) | Power (5 Volts DC) |
| 2 | Black with light blue stripe (BLK/LT BLU) | Sensor Ground |
| 3 | Tan with yellow stripe (TAN/YEL) | CMP Signal |
The following ignition system wiring diagrams will further help you identify the camshaft position sensor circuits:
- Ignition System Circuit Diagram (1992-1993 3.9L Dodge Dakota).
- Ignition System Circuit Diagram (1994-1995 3.9L Dodge Dakota).
- Ignition System Circuit Diagram (1996 3.9L Dodge Dakota).
- Ignition System Circuit Diagram (1997-1999 3.9L Dodge Dakota).
Where To Buy The Camshaft Position Sensor
Checkout the following links and comparison shop the camshaft position sensor for your 1992, 1993, 1994, 1995, 1996, 1997 Dodge Dakota:
TEST 1: Testing The Camshaft Position Signal
To start off our camshaft position (CMP) sensor diagnostic, we're gonna' verify that the CMP sensor is creating an ON/OFF voltage signal as we crank the engine.
ON is when the CMP signal reads 5 Volts DC and OFF is when it reads 0 Volts DC (on the multimeter).
If the camshaft position sensor is working correctly, you're gonna' see the multimeter switching between 5 Volt and 0 Volts as you crank the engine.
If the camshaft position sensor is bad, it's gonna' stay stuck producing a single voltage value (usually 0 Volts) as you crank the engine.
We'll accomplish this by connecting our multimeter to the tan with yellow stripe (TAN/YEL) wire of the CMP sensor's engine wiring harness connector. In the photo above, the TAN/YEL wire is identified with the number 3.
Before we start let me tell you that your 3.9L Dodge Dakota comes equipped with a camshaft position sensor and a crankshaft position sensor. The camshaft position sensor is located in the distributor and the crankshaft position sensor is bolted onto the transmission bell housing. Both of the connectors are in the same location so take care to test the correct connector.
IMPORTANT: The camshaft position (CMP) sensor must be connected to its engine harness connector for this test to work. You'll need to connect your multimeter test lead to a back probe or a wire piercing probe to read the CMP signal. You can see an example of a wire piercing probe here: Wire Piercing Probe Review (Power Probe PWPPPPP01).
NOTE: Don't have a multimeter or need to upgrade yours? Check out my recommendation: Buying A Digital Multimeter For Automotive Diagnostic Testing.
These are the test steps:
- 1
Place your multimeter in Volts DC mode.
- 2
Disconnect the ignition coil from its electrical connector. This is an important safety precaution!
NOTE: Don't remove the distributor cap from the distributor. The distributor cap must be in place to hold down the camshaft position sensor. - 3
With the red multimeter test lead, probe the tan with yellow stripe (TAN/YEL) wire of the cam sensor connector.
NOTE: The camshaft position sensor must remain connected to its engine wiring harness connector to be able to read its signal. - 4
Connect the black multimeter test lead directly on the battery negative (-) terminal.
- 5
Have your helper crank the engine for a few seconds once the multimeter test lead connections are set up.
- 6
Your multimeter should see the voltage switch between 5 Volts and 0 Volts DC as the engine is cranking.
Let's examine your CMP signal test result:
CASE 1: The multimeter read the indicated ON/OFF DC voltage. This is the correct and expected test result and tells you that the camshaft position sensor is functioning correctly.
Since the camshaft position sensor IS NOT defective, something else is causing your 3.9L V6 Dakota to not start.
CASE 2: The multimeter DID NOT read the indicated ON/OFF DC voltage. This test result usually means that the camshaft position sensor is defective.
Before you replace it, make sure it's getting power and Ground. For the next test go to: TEST 2: Making Sure The CMP Sensor Has Power.
