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.How To Test The MAF Sensor (1996-1998 1.5L Mazda Protege).MAF Sensor Circuit Wiring Diagram (1996-1998 1.5L Mazda Protege).Ignition System Wiring Diagram (1995 1.5L Mazda Protege).Here's a small sample of the tutorials you'll find in the index: You can find a complete list of 1.5L Mazda Protege tutorials in this index: This missing Ground is usually caused by an open-circuit problem in the BLK wire between the throttle position sensor's connector and the fuel injection computer's connector. Without Ground the TPS will not function. Confirmed, in this test section, that the TPS is getting Ground.ĬASE 2: The BLK/RED wire IS NOT feeding Ground to the TPS.Confirmed that the TPS is getting 5 Volts (TEST 2).Confirmed that the TPS voltage signal does not increase/decrease as you opened/closed the throttle plate (TEST 1).You can correctly conclude that the TPS is defective if you have: Your multimeter should read 10 to 12 Volts DC.ĬASE 1: The BLK/RED wire is feeding Ground to the TPS. The multimeter voltage test I'm suggesting below is a safe way to test for the presence of Ground in the wire. Be careful and don't connect this wire to battery 12 Volts or you'll fry the fuel injection computer. NOTE: Ground is provided by the fuel injection computer of your 1.5L Mazda Protege. To test for the presence of Ground in the BLK/RED wire, we're gonna' to do a simple multimeter voltage test. In the photo above, the BLK/RED wire connects to the female terminal labeled with the no. The wire that supplies Ground do the TPS, is the black with red stripe ( BLK/RED) wire of the sensor's 3-wire connector. The TPS is getting 5 Volts on the LT GRN/RED wire (TEST 2).įor our third and last test, we're gonna' make sure that the throttle position sensor is receiving Ground from the fuel injection computer.The TPS is not producing a voltage signal that increases/decreases as you open/close the throttle plate (TEST 1).If you've reached this point, your TPS diagnostic test results have confirmed that: ![]() These missing 5 Volts are usually the result of an open-circuit problem in the LT GRN/RED wire between the TPS sensor's connector and the fuel injection computer's connector. Without these 5 Volts the TPS, on your 1.5L Mazda Protege, will not function. Go to: TEST 3: Making Sure The TPS Has Ground.ĬASE 2: The LT GRN/RED wire IS NOT feeding the TPS with 5 Volts. Now that you have confirmed that your 1.5L Mazda Protege's TPS is getting 5 Volts, the next step is to make sure it's getting Ground. Your multimeter should read 4.5 to 5 Volts DC.ĬASE 1: The LT GRN/RED wire is feeding the TPS with 5 Volts.
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