Mercury F1SZ-10884-A Sender Assembly - Temperature

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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.

There are two engine coolant temperature senders. One drives the temperature gauge or warning light on the instrument panel; this is generally referred to as the sending unit. The other is used by the computer to determine engine coolant temperature and adjust fuel/air mixture accordingly; this is generally referred to as a sensor. The two are easily distinguished since the sending unit for the temperature gauge has only one wire going to it, while the unit that provides information to the computer has two or three wires. On SOHC four-cylinder engines, the sending unit for the gauge or light is threaded into the driver's side of the engine block, at the rear, just below the cylinder head. On 2001 and later 2.3L engines, the sending unit is located at the rear of the engine mounted into the coolant outlet pipe. Do not mistake the temperature sending unit for the oil pressure sending unit, which is just above the coolant temperature sending unit, threaded into the cylinder head. On V6 engines, the sending unit for the gauge is located on the front lower part of the intake manifold, near the thermostat housing. Allow the cooling system to completely cool down, then open the cooling system pressure cap to relieve any pressure in the cooling system. Install the cap. This will minimize coolant loss during this procedure. Disconnect the electrical connector from the sending unit. Wrap the threads of the new sending unit with Teflon tape. Remove the old sending unit from the engine. Place your finger over the hole in the engine to minimize coolant loss. Immediately install the new sending unit and tighten it securely. Connect the sending unit electrical connector. Check coolant level and top up if necessary. Start the engine and check for leaks.

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.

The coolant temperature indicator system has a dashboard light and engine-mounted sending unit. If overheating is indicated, check the coolant level, wiring, and fuses. The indicator light should glow when the ignition is on and the starter motor is running. If it doesn't, the bulb may be burned out, the ignition switch faulty, or the circuit open. Grounding the wire to the sending unit can help diagnose the problem. If the light doesn't go out after the engine starts, it could be due to a grounded wire, defective sending unit, or faulty ignition switch. Check the coolant type and mixture. If replacing the sending unit, disconnect the connector, unscrew the sensor, and use sealant on the threads. Ensure the engine is cool before removal and be ready for coolant loss. Check the coolant level after replacement.

The coolant temperature sender is located in the left, rear side of the engine, below the cylinder head for a 2.3L engine and on the top, left front of the engine, on the intake manifold for a 2.9L and 4.0L engine. Before removing the sender from the engine block and testing it, perform the tests to ensure that it is the sender malfunctioning, and not another part of the circuit. Remove the coolant temperature sender from the engine block. Attach an ohmmeter to the sender unit by attaching one lead to the metal body of the sender unit (near the sender unit's threads) and the other lead to the sender unit's wiring harness connector terminal. With the leads still attached, place the sender unit in a pot of cold water so that neither of the leads is immersed in the water. The portion of the sender unit which normally makes contact with the engine coolant should be submerged. Measure and note the resistance. Slowly heat the pot up (on the stove) to 19D-210 degrees Fahrenheit(88-99 degrees Celsius) and observe the resistance of the sender unit. The resistance should evenly and steadily decrease as the water temperature increases. The resistance should not jump drastically or decrease erratically. If the sender unit did not function as described, replace the sender unit with a new one. Ensure that the engine is cold prior to opening the cooling system or removing the sender from the engine. The cooling system on a hot engine is under high pressure, and released hot coolant or steam can cause severe burns. Disconnect the negative battery cable. Remove the radiator cap to relieve any system pressure. Disconnect the wiring at the sender. Remove the coolant temperature sender from the engine. Coat the threads on the sender with tape or electrically conductive sealer, then install the sender. Tighten the sender to 107-143 inch lbs. (12-16 Nm). Attach the wiring to the sender and connect the negative battery cable. If necessary, add antifreeze to replace any lost coolant, then install the radiator cap.

The engine coolant temperature sensor measures the temperature of the coolant and provides a signal to the PCM. When testing, disengage the wiring harness from this component and use an ohmmeter to measure its resistance. Enumerate readings obtained at both cold and hot states of the coolant on a graph. Replace it if they do not correlate with it. To remove or reinstall this part, first drain the coolant, then disconnect the battery and take off the sensor before reinstalling it again. Check for leakages after refilling it, add back water and start your car.

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.

Before removing the old sending unit, remove the radiator cap to relieve any residual pressure, then reinstall the cap.

To replace the Oxygen sensor, disconnect the battery, raise the vehicle, remove the sensor using the appropriate tool, apply anti-seize compound to new threads, and secure the installation.

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.

If an excessively high temperature indication is observed, consider troubleshooting procedures.

On V6 engines, the sending unit for the gauge is located on the front lower part of the intake manifold, near the thermostat housing.

The coolant should be checked to ensure it is of the proper type and mixture.

To replace the sending unit, you should disconnect the electrical connector and unscrew the sensor from the engine. Take caution not to crack the fragile unit and use sealant on the threads. Ensure the engine is cool before removing the defective sending unit and be prepared for coolant loss.

If an excessively high temperature indication is observed, consider troubleshooting procedures.

Start by removing the cap from the radiator to release any pressure, then replace the cap. Disconnect the electrical connector from the sending unit. Apply electrically conductive sealant to the threads of the new sending unit. Unscrew the old sending unit from the engine and quickly install the new one to prevent coolant loss. Tighten the sending unit securely and reconnect the electrical connector. Refill the cooling system, run the engine, and check for leaks and proper gauge operation.

Vehicles equipped with TFI-IV electronic ignition systems are also equipped with the Electronic Engine Control (EEC-IV) system.

The coolant temperature indicator system consists of a temperature gauge mounted in the instrument panel and a coolant temperature sending unit mounted on the engine. Some vehicles may have multiple sending units, but only one is used for the indicator system.

As soon as the engine starts, the indicator light should go out and remain out unless the engine overheats.

Install the new sending unit and tighten it securely.

Disconnect the ECT sensor and use an ohmmeter to measure resistance values. At 65 degrees F, the resistance should be approximately 40,500 ohms, and it should have lower resistance at operating temperature.