You can see an example of this tool here: Wire Piercing Probe ( ). To be able to access the voltage inside the signal wire, you'll need to use either a back probe or a wire piercing probe. IMPORTANT: The throttle position sensor (TPS) must remain connected to its electrical connector for this test to function properly. If the throttle position sensor is bad, you'll see that the TPS voltage signal stays stuck in one value as you open/close the throttle plate. In the photo above, I have labeled the BLU/YEL wire with the number 2. The BLU/YEL wire is one that carries the TPS voltage signal to your Mazda Protege's fuel injection computer. We're going to connect multimeter to the blue with yellow stripe ( BLU/YEL) wire of the sensor's 3-wire connector. TEST 1: Testing The TPS Voltage Signalįor our very first test, we're gonna' make sure that the throttle position sensor is creating a voltage signal that increases/decreases as you open/close the throttle plate. NOTE: The above throttle position sensor (TPS) fits the following vehicles: 1995, 1996, 1997, 1998 1.5L Mazda Protege. The following links will help you to comparison shop for the throttle position sensor on your 1.5L Mazda Protege: Light Blue With Yellow Stripe (LT BLU/YEL) Throttle Position Sensor (TPS) Circuit Descriptionsīelow are the circuit descriptions of the 3 wires of the throttle position sensor's connector. Engine cranks a long time before starting.Lack of power, rough idle, or hesitation.You're also going to see one or more of the following symptoms: P0121 Throttle Position Sensor Performance Problem.You're going to see the following TPS diagnostic trouble code lighting up the check engine light: Since the throttle position sensor (TPS) is such an important component of the engine management system, when it fails you're gonna' definitely feel the engine resent it. In a nutshell, the throttle position sensor produces a voltage signal that increases as you step on the accelerator pedal and the throttle plate opens.Īs you step off the accelerator pedal, the throttle plate starts to close and the TPS voltage signal decreases back to its original base voltage.Īll of these throttle plate angle changes are constantly reported to the fuel injection computer on your 1.5L Mazda Protege. It's the throttle position sensor's job to measure the throttle plate angle as it opens or closes as you step on or off the accelerator pedal. Symptoms Of A Bad Throttle Position Sensor You can find this tutorial in Spanish here: Cómo Probar El Sensor TPS (1995-1998 1.5L Mazda Protege) (at: ).ĪPPLIES TO: This tutorial on testing the TPS applies to the following vehicles: TEST 3: Making Sure The TPS Has Ground.TEST 2: Making Sure The TPS Has 5 Volts.TEST 1: Testing The TPS Voltage Signal.Throttle Position Sensor (TPS) Circuit Descriptions.Symptoms Of A Bad Throttle Position Sensor.
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