Mercury F4SZ-9B989-A Potentiometer - Engine Throttle

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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. Failure in the coolant sensor circuit triggers codes 21, 51, or 61 (two-digit) or 116, 117, 118 (three-digit). Resistance values should be checked while cold (58,750 to 40,500 ohms) and at operating temperature (3,600 to 1,840 ohms). Signal voltage to the sensor from the PCM should be around 5.0 volts. During replacement, wait for the engine to cool, use Teflon tape on threads, and handle the sensor with care.The Manifold Absolute Pressure (MAP) sensor monitors intake manifold pressure changes, converting them into a voltage output. A failure triggers codes 22 or 72 (two-digit) or 126, 128, 129 (three-digit). Check reference voltage (4.0 to 6.0 volts), backprobe the MAP/BP Signal wire, and apply vacuum to observe tachometer readings. Incorrect results indicate MAP sensor replacement.Oxygen sensors monitor exhaust oxygen content, adjusting air/fuel mixture. Check for a steady signal voltage between 0.35 and 0.55 volts at normal operating temperature. Codes 41, 42, 91, 92 (two-digit) or 136, 137, 139, 144, 171-178 (three-digit) indicate issues. Ensure the oxygen sensor heater receives battery voltage. Special care during service is essential.The Throttle Position Sensor (TPS) monitors throttle angle. Check for proper signal voltage (0.50 to 1.0 volts at idle, 4.0 to 5.0 volts at full throttle) and reference voltage (approximately 5.0 volts). Check potentiometer resistance (0.8 to 1.0 K ohms at closed throttle, 3.0 to 4.0 K ohms at full throttle). Replace if readings are incorrect.The Mass Air Flow (MAF) sensor, for 4.6L engines, measures air entering the engine. Check for power, signal voltage (0.2 to 1.5 volts at idle, increasing to about 2.0 volts at 60 mph), and use an ohmmeter for resistance checks. Replacement involves disconnecting the electrical connector, removing the air cleaner assembly, and uninstalling the MAF sensor.The Manual Lever Position (MLP) sensor, now Transmission Range (TR) sensor, indicates transmission gear. Check terminal connectors for attachment, verify power, and adjust if necessary. Diagnostics require special tools.The air conditioning clutch control involves PCM control of the compressor clutch. If the air conditioning does not function, check relays and switches. To test, remove the relay and bridge the battery feed and compressor clutch terminals. The Vehicle Speed Sensor (VSS) monitors speed, usually setting Code 24 if faulty. Check for signal voltage (10 volts or more). Replacement involves disconnecting the electrical connector, removing the retaining bolt, and lifting the VSS from the transmission. The Intake Manifold Temperature Sensor measures air temperature entering the engine. Check for correct reference voltage (5 volts) and resistance changes with temperature. Code 54 indicates issues.The power steering pressure switch affects idle quality. Problems may set Code 52. Check for open or closed circuits affecting engine timing.The crankshaft position sensor defines engine position for the PCM, and any issues require professional diagnosis. Replacement involves removing the electrical connector and retaining bolt.The camshaft position sensor is triggered by the camshaft sprocket's high point. Diagnostic work should be done by professionals.The Brake Light Switch informs the PCM when brakes are applied. Ensure proper voltage and continuity, and replace if needed. Brake light circuit and bulb conditions can impact idle quality.

Before deciding that sensor failure has occurred, it is necessary to inspect wiring problems when troubleshooting the Throttle Position Sensor (TPS). The TPS is a potentiometer on the throttle body that sends throttle position to the PCM through a voltage signal. Surging or stalling may result from a faulty TPS. To test the TPS, disconnect the sensor and check the reference voltage, which should be around 5.0 volts with the ignition On and the engine off. Reconnect the sensor and measure the signal voltage, which should be 0.5 to 1.5 volts at closed throttle and increase steadily to 4.0 to 5.0 volts at wide-open throttle. Ensure that when closed, the meter reads less than 1.5 volts, and when fully open it gives about 5.0 volts reading on the multimeter display. There can be a need for advanced tests if those issues continue happening in your car engine system or have some effect on vehicle performance. Remove the snow shield (on 2001 and later models) to replace the non-adjustable TPS. Then, disconnect the electrical connector before firmly attaching the new sensor on the throttle body.

The Brake On/Off switch or Brake Pedal Position (BPP) Sensor information states its role in indicating brake application and its location on the brake pedal assembly.

During installation, ensure the gasket is in place and position new gasket(s) onto the lower intake mounting face. Secure the air intake plenum and throttle body assembly with the six upper intake manifold retaining bolts, tightening them to the specified torque.

Start by disconnecting the negative battery cable. Following that, unplug electrical connectors at the air bypass valve, throttle position sensor, and EGR position sensor. Detach the accelerator cable and transmission linkage from the throttle body assembly, remove the accelerator cable/Throttle Valve (TV) cable bracket from the intake manifold, and label and detach vacuum lines from the upper intake manifold vacuum tree, EGR valve, and fuel pressure regulator.

Installation is the reverse of removal. Use new sensor mounting screws and tighten them securely, ensuring that the screws are installed with a hand tool only, not a power driver.

The F4SZ.9B989.A is replaced by the F4SZ.9B989.AA

No, this part does not come with new bolts