The throttle place sensor (TPS) can be tested using a an easy multimeter and also in this accuse I"ll show you just how in a step-by-step way.

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To check the TPS you don"t require a scan tool (although having actually one is major plus).

NOTE: back the straightforward testing ethics of this tutorial use to any Dodge TPS, the illustrations use only come 2000-2007 4.7L Durango, 4.7L Dakota, and also 4.7L ram 1500 pick Up. View the Applies To: box on the right pillar for an ext specifics.

friend can uncover this indict in Spanish here: Cómo Probar El Sensor TPS (2000-2007 4.7L evade V8) (at:

Symptoms that A bad Throttle position Sensor

The throttle place sensor"s project is come tell the PCM exactly how much the throttle plate opens/closes as you action on/off the accelerator.

The PCM then supplies this info to calculation fuel injection, advance/retard ignition timing, etc. So when the TPS fails, her 4.7L dodge engine is gonna" resent it.

Here are several of the symptoms her 4.7L Dodge will certainly experience when the throttle position sensor fails:

A TPS diagnostic trouble password (DTC) save on computer in the PCM"s memory:P0121: Throttle position (TP) Circuit power Problem.P0122: Throttle place (TP) Circuit short Input.P0123: Throttle position (TP) Circuit High Input.Your 4.7L Dodge stops working the smog check (state mandated emissions test).Bad gas mileage.Hard begin and/or expanded cranking time (after close up door off).Black smoke coming out of the tailpipe.Hesitation when accelerating your auto down the road.

As discussed at the beginning of this tutorial, the TPS have the right to be experiment without a scan tool and also in the next section we"ll begin with the very an initial test.

Where come Buy her TP Sensor and Save

The adhering to links will aid you come comparison shop for the throttle place sensor:

Not certain if the over TP sensor fits your details 4.7L equipped evade Durango (Dakota, ram 1500)? Don"t worry, as soon as you acquire to the site, they"ll make certain it fits by questioning you the particulars of your vehicle. If the doesn"t fit, they"ll uncover you the right one.

TEST 1: experimentation The Throttle place Sensor Voltage Signal

The an initial test we"re gonna" carry out is uncover out if the TPS is creating a accelerator plate edge voltage signal with a multimeter linked to its center wire.

In a nutshell, this is just how the TPS works:

The accelerator plate edge voltage signal boosts as the throttle plate opens. At wide-open-throttle (WOT), the TPS produces about 4.5 Volts DC.As the accelerator plate starts to close indigenous its WOT position, the voltage signal starts come decrease.

So, this increases/decreases are what our multimeter need to report together we check the TPS.

NOTE: The throttle position sensor has to remain bolted come the accelerator body and connected come its connector because that this test to occupational (this is where a cable piercing probe come in handy to acquire to the signal inside the wire. To view what one looks like, click here: cable Piercing Probe Tool.)

OK, let"s start:


Place your multimeter in Volts DC mode and with the red multimeter test command probe the center wire that the sensor"s connector. This is the wire that connects to TPS terminal #2 in the illustration above.


Ground the black color multimeter test lead on the battery negative terminal. Have actually your helper revolve the an essential On, yet don"t start the engine (this will certainly power up the TP sensor).


Your multimeter have to report a voltage in between 0.2 to 0.9 Volts DC. If your multimeter doesn"t, don"t worry around it simply yet, continue with the other steps.

Part 2


Now, slowly open the accelerator (by hand and also from the engine compartment) when you watch the readjust in voltage numbers on her multimeter.For this test result to be accurate, you should open the throttle by hand and also not from within the vehicle.


As the accelerator opens, the voltage numbers will increase. This rise in voltage should be smooth and without any kind of gaps or skips. Once the accelerator is vast open, your multimeter must read somewhere in between 3.5 come 4.5 Volts DC.


Now, progressively close the throttle. As the accelerator is closing, you must see the voltage decrease smoothly and also without any type of gaps or skips, to the exact same voltage you i found it in action 4.

Part 3


OK, currently you"ll need someone to assist you easy tap ~ above the throttle place sensor v the take care of of a screw-driver (or miscellaneous similar, and I want to emphasize the native ‘lightly tap’) as you progressively open and close the throttle and also observe the multimeter.If the TPS is bad, the tapping will reason the voltage number to skip or go blank. If the TPS is OK, the tapping will have no impact on the voltage numbers.


Repeat step 7 several times come make sure of her multimeter test results.

Let"s take a watch at her test results:

CASE 1: The accelerator angle voltage increased and also decreased as you opened and also closed the accelerator plate. This confirms the the throttle place sensor is OK and also not defective.

CASE 2: The throttle angle voltage go NOT increase (and/or decrease) as you opened and closed the accelerator plate. This tells you the the TPS is bad and also causing the TPS trouble code lighting increase the check engine light (CEL) on your 4.7L evade Durango (Dakota).

Before you run out and buy it, I"m gonna" imply that you carry out two more tests. One is to inspect that the TPS is getting power. The other is to check that it"s Ground. To examine that the TPS is obtaining power, walk to: test 2: Verifying Throttle place Sensor has actually Power.

CASE 3: The multimeter DID no register any voltage. This test result doesn"t guilty of the TP sensor as bad just yet. Why? Because...

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, the TP sensor may be absent either power or ground. For this reason the following step is to check that the TP sensor is getting power, walk to: test 2: Verifying Throttle place Sensor has Power.