Ford F4SZ-9B989-AA Engine Throttle Potentiometer

The Throttle Position Sensor (TPS) is located on the end of the throttle shaft on the throttle body. By monitoring the output voltage from the TPS, the PCM can determine fuel delivery based on throttle valve angle (driver demand). A broken or loose TPS can cause intermittent bursts of fuel from the injectors and an unstable idle because the PCM thinks the throttle is moving. A problem with the TPS circuits will set a diagnostic trouble code. Ensure the ignition key is in the OFF position. 2005 AND EARLIER MODELS: Remove the air filter housing duct at the throttle body. On 2005 models with 5.4L engines, the entire air cleaner must be removed. Remove the accelerator shield if it interferes. Disconnect the electrical connector from the TPS. Remove the screws that retain the TPS to the throttle body and remove the TPS. Installation is the reverse of removal. Tighten the TPS mounting screws securely. 2006 AND LATER MODELS: Disconnect the crankcase vent tube from the air cleaner. Remove the air cleaner. Remove the four bolts and the pedestal that locates the air cleaner outlet pipe over the throttle body. Disconnect the connector at the TPS. The TPS on these models is attached to the throttle body with adhesive on the screws. Use a heat gun (no more than 1,100 watts) for three minutes at a distance of 1 inch from the sensor. If you have access to a hand-held infrared temperature reader, stop using the heat gun when the screw area reaches 130 degrees F. Use hand tools to remove the screws. On later models with adhesive screws, the TPS and the screws cannot be reused. They must be replaced. Align the plastic tab on the new TPS with the notch or hole at the throttle body, then install the screws to 27 in-lbs. The remainder of the installation is the reverse of removal.

When 2001 and newer models give driveability trouble, a working sensor that tests fine means you need to look for breaks or short circuits in the wiring harness between the sensor and PCM. If you cannot find any problems, talk to your dealership's service department or a qualified repair store. The Throttle Position Sensor (TPS) works like a variable-wire potentiometer on the throttle body, sending voltage signals to the PCM (powertrain control module) to tell how far and how fast the throttle moves. If the PCM gets incorrect throttle movement information from the TPS, it causes your car to act up by suddenly accelerating, stopping, and engaging the engine in aggravating idles. Start testing the TPS by disconnecting its electrical connection, and measure its reference voltage. It must be 5.0 volts plus or minus 0.1 volts with the engine turned on. Touch the sensor to the shifter again, then check that the port gives 0.5 to 1.5 volts when the throttle is closed and 4.0 to 5.0 volts when it opens completely. When the ignition is on, the TPS electric signal changes from under 1.5 volts all the way to about 5.0 volts during throttle movements. Contact a professional to look into the sensor if these tests show the problem is still there. Some voltage drops may not show up when you check with a voltmeter. You can't adjust the TPS; to replace it on 2001 and newer Ford Explorers, first undo all the bolts around the snow shield. Disconnect the wiring, and carefully unscrew 2 more bolts to fully detach the TPS from the throttle body. Reconnect everything after fitting in the new sensor properly into the throttle shaft.

Start by relieving fuel pressure, disconnecting the battery cable, and removing the air intake plenum assembly on 5.0L engines or the air intake assembly on 4.6L engines. Use a special spring lock coupling tool to disconnect the fuel feed and return lines from the fuel rail assembly. Remove the four fuel rail assembly retaining bolts and carefully disengage the fuel rail from the fuel injectors. The installation process is the reverse of removal.

The engine coolant temperature sensor is a thermistor that varies its voltage output based on temperature changes. Resistance values decrease as the sensor temperature increases and vice versa.

Begin by detaching the negative battery cable and disconnecting the throttle position sensor and throttle air bypass valve electrical connectors. Disconnect the accelerator cable, Throttle Valve (TV) cable (if equipped), and the PCV vent closure hose (if present). Remove the four throttle body mounting nuts, and on 5.0L engines, carefully separate the throttle body from the EGR spacer, discarding the gasket for 5.0L engines.

THIS IS THE SAME PART WHICH IS AVILABLE