Mercury F5AZ-12A697-A Sensor Assembly

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When working with the PCM (some call it the EEC-V module) or its related harness, be careful not to touch directly any terminal on the electrical connector as static electricity could damage the PCM's delicate electronic components. It is recommended that you wear a static discharging wrist strap and do not work on electronics when relative humidity of less than 25% is experienced. There must be checks for general EEC-IV power relay and ground to avoid confusion or misdiagnosis. Battery powered fuel injection and electric fuel pump related components requiring 10.5 volts or above are provided by EEC relay and associated circuits. The PCM (EEC-IV) reduces input voltage to four-to-six volts for output to sensors requiring specific reference voltage (VREF). For checking fuel delivery component(s), verify proper electrical operation of the following: Dual tank models should have their fuel pumps relays, inertia switches, fuel pump(s), fuel injectors, and fuel tanks selector switch checked correctly during circuit checks for these components. Information sensors and output actuators include engine coolant temperature sensor which varies its voltage output based on temperature changes like a thermistor does. Resistances change with temperatures; coolant sensor circuit failures may set diagnostic code. For cold-started measurements of resistance values in order to establish if it is within correct ranges at operating temperature provide suitable data against which one can test the sensor's performance before confirming its current status too. Verify about 5 volts signal voltage from PCM to sensor. Always wrap new sensors' threads with Teflon sealing tape when installing them into exhaust manifolds .The Manifold Absolute Pressure (MAP) sensor senses intake manifold pressure variation then converts them into voltage output signals .Voltage varying type MAP sensors are also available as well as frequency varying types too. A failure in MAP sensor circuitry however might lead to diagnostic trouble code creation .Check reference voltage to MAP sensor after back probing wiring harness for determining type of sensor. Use a tachometer and a hand held vacuum pump to test the response of this device, verifying that it changes smoothly from one reading into another. Replace the MAP sensor if necessary results show malfunctioning. The heated oxygen sensor (HO2S) monitors the oxygen content of the exhaust gas stream, producing a voltage output that varies with air fuel ratio .Diagnostic codes indicate problems in the oxygen sensor system. Check their signal voltage stability between 0.35 and 0.55 volts at normal operating temperature. Sensor operation depends on electrical connections, outside air supply, operating temperature, and unleaded fuel use .Take special care during servicing sensors so as not to damage them. Prior replacing O2 sensors caution should be taken because they are located in exhaust manifold or pipe itself .Start and run engine briefly before removal to facilitate loosening. Make sure to disconnect battery, lift vehicle off ground , disconnect electrical connector, unscrew sensor from its position , apply anti-seize compound on threads of new sensor then install it , reconnect electrical connector.The Throttle Position Sensor (TPS) located on throttle body measures angle of throttle valve which affect how much fuel is delivered.Problems in TPS or circuitry may result in diagnostic trouble code being set To check the TPS measure signal voltage at idle and full-open throttle positions Verify reference voltage for TPS and resistance across potentiometer within it Adjust TPS when required.The Intake Manifold Temperature Sensor also known as Air Charge Temperature (ACT) sensor is a resistor changing value with air temperature placed inside intake manifold .Intake Manifold Temperature Sensor malfunction may produce diagnostic trouble code.Check reference voltage and measure resistance across terminals at different temperatures.Power steering pressure switch issues may cause timing to retard at idle or engine stalling under heavy power steering use A pressure switch that fails to open or close may impact engine performance.Verify battery voltage for power steering pressure switch along with continuity to brake light bulbs. The Brake Light Switch indicates brake application to the PCM. Issues with the Brake Light Switch or circuit may affect idle quality. Check battery voltage for Brake Light Switch and continuity to brake light bulbs.The EGR Valve Position (EVP) sensor attached to the EGR valve produces a signal indicating the EGR valve's position. Check reference voltage and resistance of EVP sensor Apply vacuum and check resistance change Replace EVP sensor if necessary .The Knock Sensor (KS) detects engine detonation, sending a voltage signal to the PCM to retard spark timing.Check reference voltage for knock sensor and simulate operating conditions for timing response Replace KS if it does not respond.Idle Air Control (IAC) or Bypass Air Idle Speed Control (BPA-ISC) solenoid controls idle speed by regulating air bypassing throttle body.Check PCM signal voltage, inspect pintle for carbon deposits, measure solenoid resistance Clean IAC valve housing during installation and install new O-ring.Mass Airflow (MAF) sensor measures air entering the engine using a hot wire sensing element .Check power supply to MAF sensor and voltage signals at idle as well as increased engine speed.Disconnect MAF sensor then test its resistance.Replace MAF sensor where necessary.The Manual Lever Position (MLP) sensor on transmission indicates gear position being sent out through PCM Let each signal wire get power before having switch adjusted Further diagnostics require specialized equipment.

To replace Engine Coolant Temperature (ECT) sensor for 2011 models, drain the cooling system, wrap new sensor's threads with Teflon sealing tape, unplug the electrical connector and remove the sensor by thermostat housing. For 2001 and newer 2.3L models a Cylinder Head Temperature (CHT) sensor is used; disconnect battery, expose electrical connector, unscrew and remove CHT sensor. The Oxygen Sensor replacement involves disconnecting the battery, raising the vehicle and removing the O2 sensor using proper tool, apply anti-seize compound to new threads and tighten it into place. Throttle Position Sensor (TPS) replacement requires disconnecting of battery, removal of throttle body cover, unfastening of TPS and ensure proper alignment during installation. Replacing Mass Airflow Sensor (MAF) means; firstly you need to disconnect battery from its terminal, then undo electrical connection between MAF sensor's plug-in connectors followed by taking off MAF sensor itself lastly install new one with a fresh gasket on 2011 models. To control air conditioning clutch relay PCM controls this while checking fuses for any malfunctioning Air conditioning clutch control means that PCM operates this clutch relay as you verify fuses for defects which may be interfering with idle speed quality in your vehicle at all times Vehicle Speed Sensor (VSS) change applies to those vehicles made before 1997; therefore when replacing it you are supposed to detach an electric connector from a particular component installed in a car under consideration while removing retaining bolt also do not forget about reversing above mentioned process Intake Manifold Temperature Sensor replacement includes disconnecting the battery, unplugging the intake manifold temperature sensor connector, removing the IMTS from intake manifold Idle Air Control (IAC) valve replacement requires disconnection of battery power supply followed by taking IAC valve cover out where electronic wires should be disconnected only after unscrewing screws Power steering pressure switch inspection comprises of checking fuses as well as circuits that might be affecting idle quality in your automobile Camshaft Position (CMP) sensor replacement varies with model, which may include but not limited to separating the battery, loosening electrical connector, removing sensor then fitting the new one properly. Crankshaft Position (CKP) sensor replacement includes disconnecting battery, removal of things like accessory drive belt or alternator, unscrewing of the sensor and installing new one with specific alignment procedures for different models Brake Light Switch or Brake Pedal Position (BPP) Sensor information informs about its purpose that is to show whether brakes are applied or not and it is located on brake pedal assembly.

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.