TEST 2: Making Sure The TPS Is Getting Power

Making Sure The TPS Is Getting Power. How To Test The Throttle Position Sensor (TPS) -3.0L Chrysler

In this test step we're gonna' check that the violet with white stripe (VIO/WHT) wire of the TP sensor's harness wire has power with a simple multimeter voltage test.

If the TP sensor is getting power, then your next (and last) test step is to confirm that the TPS is also getting Ground.

NOTE: It's not a good idea to probe the front of the TPS harness connector to test for this voltage since you could permanently damage the female metal terminal. Instead, you should back-probe the connector with the appropriate tool or use a wire-piercing probe.

OK, to get this test started, place your multimeter in Volts DC and:

  1. 1

    Connect the red multimeter test lead to the VIO/WHT wire of the TPS harness connector

    This is the wire that connects to the terminal labeled with the number 1

    NOTE: Depending on your specific vehicle, this wire may be a VIO/WHT wire or a VIO wire.

  2. 2

    Ground the black multimeter test lead directly on the battery's negative terminal.

  3. 3

    Have a helper turn the key to the On position, but don't crank or start the engine after the multimeter test leads have been set up.

  4. 4

    Your multimeter should register 4.5 to 5 Volts DC if the VIO/WHT wire is feeding the throttle position sensor (TPS) with power.

Let's take a look at what your test results mean:

CASE 1: The multimeter registered 4.5 to 5 Volts DC. This is the correct and expected test result and tells you that the throttle position sensor (TPS) is getting power.

Your next step is to make sure that the TPS is getting Ground on the BLK/LT BLU (black w/ light blue) wire. For this test, go to: TEST 3: Making Sure The TPS Is Getting Ground.

CASE 2: The multimeter DID NOT register 4.5 to 5 Volts DC. Re-check your multimeter test lead connections and re-test.

If the multimeter still indicates the TPS is not getting power, then you've found the reason why the TPS did not create a voltage signal in TEST 1.

Although it's beyond the scope of this tutorial to find the reason why these 5 Volts are missing, you'll need to get yourself a wiring diagram (for your particular Chrysler car or mini-van) and check the continuity of this wire between the TPS and the PCM.

TEST 3: Making Sure The TPS Is Getting Ground

Making Sure The TPS Is Getting Ground. How To Test The Throttle Position Sensor (TPS) -3.0L Chrysler

So far, you have checked and confirmed that your Chrysler car or mini-van's throttle position sensor is:

One: Not creating an increasing/decreasing throttle plate voltage signal on the ORG/DK BLU wire (TEST 1).

Two: Is getting power on the VIO/WHT wire of the TPS harness connector (TEST 2).

The last test is to make sure that the black with light blue stripe (BLK/LT BLU) wire is feeding the TPS with Ground.

NOTE: Be careful and do not short this wire to battery voltage, or you'll fry your Chrysler's PCM.

These are the test steps:

  1. 1

    Connect the black multimeter test lead to the BLK/LT BLU wire of the TPS harness connector

    This is the wire that connects to the terminal labeled with the number 3.

  2. 2

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

  3. 3

    Have a helper turn the key to the On position, but don't crank or start the engine after the multimeter test leads have been set up.

  4. 4

    Your multimeter should register 12 Volts DC if the BLK/LT BLU wire is feeding the throttle position sensor (TPS) with Ground.

Let's examine your multimeter test results:

CASE 1: The multimeter registered 12 Volts DC. This test result confirms that the TPS is getting Ground. Now, since you have:

  1. Confirmed that the TPS is not creating a throttle plate angle voltage signal (TEST 1).
  2. Confirmed that it is getting power (TEST 2).

And in this test step you have confirmed that the throttle position sensor is getting Ground, then you can conclude that the reason its not creating a throttle plate angle signal is because it is defective and needs to be replaced.

CASE 2: The multimeter DID NOT register 12 Volts DC. Re-check all of your test connections and repeat the test.

If the multimeter still does not show the indicated voltage, then you've found the reason why the TPS did not create a voltage signal in TEST 1.

Although it's beyond the scope of this tutorial to find the reason why this Ground is missing, you'll need to get yourself a wiring diagram (for your particular Chrysler) and check the continuity of this wire between the TPS and the PCM.



Chrysler Vehicles:

  • LeBaron 3.0L
    • 1991, 1992, 1993, 1994, 1995

Dodge Vehicles:

  • Caravan 3.0L
    • 1991, 1992, 1993, 1994, 1995
  • Daytona 3.0L
    • 1991, 1992, 1993
  • Dynasty 3.0L
    • 1991, 1992, 1993

Dodge Vehicles:

  • Grand Caravan 3.0L
    • 1992, 1993, 1994, 1995
  • Monaco 3.0L
    • 1991, 1992
  • Shadow 3.0L
    • 1992, 1993, 1994
  • Spirit 3.0L
    • 1993, 1994, 1995

Plymouth Vehicles:

  • Acclaim 3.0L
    • 1993, 1994, 1995
  • Grand Voyager 3.0L
    • 1992, 1993, 1994, 1995
  • Sundance 3.0L
    • 1993, 1994
  • Voyager 3.0L
    • 1991, 1992, 1993, 1994, 1995