Ford F1SZ-10884-A Sender Assembly - Temperature

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When working with the PCM (also known as the EEC-V module) or associated harness, exercise caution to avoid direct contact with the electrical connector terminals, as static electricity can damage delicate electronic components inside the PCM. It is recommended to wear a static discharging wrist strap and avoid working on electronics when relative humidity is under 25 percent. General EEC-IV power relay and ground checks are essential to prevent confusion and inaccurate diagnosis. The EEC relay and associated circuits provide battery power (VPWR) to fuel injection and electric fuel pump-related components requiring 10.5 volts or greater. The PCM (EEC-IV) reduces the input voltage to four-to-six volts for output to sensors requiring a specific reference voltage (VREF). For fuel delivery component and circuit checks, verify proper electrical operation of the fuel pump relay, inertia switch, fuel pump(s), fuel injectors, and fuel tank selector switch on dual tank models. Information sensors and output actuators include the engine coolant temperature sensor, which is a thermistor varying its voltage output based on temperature changes. Resistance values change with temperature, and failure in the coolant sensor circuit may set a diagnostic code. To check the sensor, measure its resistance values when cold and at operating temperature, ensuring correct values. Verify the signal voltage to the sensor from the PCM, which should be approximately 5.0 volts. Before installing a new sensor, wrap the threads with Teflon sealing tape. The Manifold Absolute Pressure (MAP) sensor monitors intake manifold pressure changes and converts them into a voltage output. There are voltage-varying and frequency-varying types of MAP sensors. A failure in the MAP sensor circuit may set a diagnostic code. Check the reference voltage to the MAP sensor and back probe the harness to determine the sensor type. Test the sensor response with a tachometer and a handheld vacuum pump, ensuring a smooth transition between readings. Replace the MAP sensor if test results are incorrect. The heated oxygen sensor (HO2S) monitors the oxygen content of the exhaust gas stream, producing a voltage output that varies with the air-to-fuel ratio. Diagnostic codes indicate problems in the oxygen sensor system. Check the sensor's steady signal voltage between 0.35 and 0.55 volts at normal operating temperature. The sensor's proper operation depends on electrical connections, outside air supply, operating temperature, and the use of unleaded fuel. Take special care during sensor service to avoid damage. When replacing the oxygen sensor, use caution due to the sensor's location in the exhaust manifold or pipe. Start and run the engine briefly before removal to facilitate loosening. Disconnect the battery, raise the vehicle, disconnect the electrical connector, unscrew the sensor, apply anti-seize compound to the threads, install the new sensor, and reconnect the electrical connector. The Throttle Position Sensor (TPS) is located on the throttle body and monitors throttle valve angle, affecting fuel delivery. Problems in the TPS or circuit may set a diagnostic code. To check the TPS, measure the signal voltage at idle and full-open throttle positions. Verify the TPS reference voltage and resistance of the potentiometer within the TPS. Adjust the TPS if necessary. The Intake Manifold Temperature Sensor, also known as the Air Charge Temperature (ACT) sensor, is located in the intake manifold and acts as a resistor changing value with air temperature. Problems with the IAT sensor may set a diagnostic code. Check the reference voltage and measure resistance across the sensor 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. Check for battery voltage to the power steering pressure switch and continuity to brake light bulbs. The Brake On/Off (BOO) switch indicates brake application to the PCM. Issues with the BOO switch or circuit may affect idle quality. Check for battery voltage to the BOO 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 for reference voltage and resistance of the EVP sensor. Apply vacuum and check resistance change. Replace the EVP sensor if necessary. The Knock Sensor (KS) detects engine detonation, sending a voltage signal to the PCM to retard spark timing. Check for reference voltage to the knock sensor and simulate operating conditions to observe timing response. Replace the knock sensor if it does not respond. The Idle Air Control (IAC) or Bypass Air Idle Speed Control (BPA-ISC) solenoid controls idle speed by regulating air bypassing the throttle body. Check for the PCM signal voltage, inspect the pintle for carbon deposits, and check the resistance of the solenoid. Clean the IAC valve housing and install a new O-ring during replacement. The Mass Airflow (MAF) sensor measures air entering the engine using a hot wire sensing element. Check for power to the MAF sensor and voltage signals at idle and increased engine speed. Disconnect the MAF sensor and check for resistance. Replace the MAF sensor if necessary. The Manual Lever Position (MLP) sensor on the transmission indicates the gear position to the PCM. Check for power to each signal wire and adjust the switch if necessary. Further diagnostics require specialized equipment.

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

The engine coolant temperature sensor resistance changes in response to engine coolant temperature, decreasing as the surrounding temperature increases. This provides a reference signal to the PCM, indicating engine coolant temperature. The ECT sensor is mounted on the lower intake manifold near the water outlet/thermostat housing, except on 2.3L engines where it is mounted on the water outlet/thermostat housing. To test the sensor, disengage the engine wiring harness connector from the ECT sensor and connect an ohmmeter between the ECT sensor terminals, setting the ohmmeter scale on 200,000 ohms. With the engine cold and the ignition switch in the OFF position, measure and note the ECT sensor resistance. Start the engine and allow it to warm up to normal operating temperature, then turn the engine OFF. Detach the engine wiring harness connector from the ECT sensor again and measure the ECT sensor resistance. Compare the cold and hot ECT sensor resistance measurements with the accompanying chart. If the readings do not approximate those in the chart, replace the ECT sensor. To remove and install the sensor, partially drain the engine cooling system until the coolant level is below the ECT sensor mounting hole. Disconnect the negative battery cable and detach the wiring harness connector from the ECT sensor. Remove the coolant temperature sensor from the intake manifold using an open-end wrench. To install, thread the sensor into the intake manifold by hand, then tighten it securely. Connect the negative battery cable, refill the engine cooling system, start the engine, check for coolant leaks and top off the cooling 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.

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°F(88-99°C) 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 Teflon® 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.

Install the new sending unit and tighten it securely.

When working with the PCM (also known as the EEC-V module) or associated harness, exercise caution to avoid direct contact with the electrical connector terminals, as static electricity can damage delicate electronic components inside the PCM. It is recommended to wear a static discharging wrist strap and avoid working on electronics when relative humidity is under 25 percent. General EEC-IV power relay and ground checks are essential to prevent confusion and inaccurate diagnosis. The EEC relay and associated circuits provide battery power (VPWR) to fuel injection and electric fuel pump-related components requiring 10.5 volts or greater. The PCM (EEC-IV) reduces the input voltage to four-to-six volts for output to sensors requiring a specific reference voltage (VREF). For fuel delivery component and circuit checks, verify proper electrical operation of the fuel pump relay, inertia switch, fuel pump(s), fuel injectors, and fuel tank selector switch on dual tank models. Information sensors and output actuators include the engine coolant temperature sensor, which is a thermistor varying its voltage output based on temperature changes. Resistance values change with temperature, and failure in the coolant sensor circuit may set a diagnostic code. To check the sensor, measure its resistance values when cold and at operating temperature, ensuring correct values. Verify the signal voltage to the sensor from the PCM, which should be approximately 5.0 volts. Before installing a new sensor, wrap the threads with Teflon sealing tape. The Manifold Absolute Pressure (MAP) sensor monitors intake manifold pressure changes and converts them into a voltage output. There are voltage-varying and frequency-varying types of MAP sensors. A failure in the MAP sensor circuit may set a diagnostic code. Check the reference voltage to the MAP sensor and back probe the harness to determine the sensor type. Test the sensor response with a tachometer and a handheld vacuum pump, ensuring a smooth transition between readings. Replace the MAP sensor if test results are incorrect. The heated oxygen sensor (HO2S) monitors the oxygen content of the exhaust gas stream, producing a voltage output that varies with the air-to-fuel ratio. Diagnostic codes indicate problems in the oxygen sensor system. Check the sensor's steady signal voltage between 0.35 and 0.55 volts at normal operating temperature. The sensor's proper operation depends on electrical connections, outside air supply, operating temperature, and the use of unleaded fuel. Take special care during sensor service to avoid damage. When replacing the oxygen sensor, use caution due to the sensor's location in the exhaust manifold or pipe. Start and run the engine briefly before removal to facilitate loosening. Disconnect the battery, raise the vehicle, disconnect the electrical connector, unscrew the sensor, apply anti-seize compound to the threads, install the new sensor, and reconnect the electrical connector. The Throttle Position Sensor (TPS) is located on the throttle body and monitors throttle valve angle, affecting fuel delivery. Problems in the TPS or circuit may set a diagnostic code. To check the TPS, measure the signal voltage at idle and full-open throttle positions. Verify the TPS reference voltage and resistance of the potentiometer within the TPS. Adjust the TPS if necessary. The Intake Manifold Temperature Sensor, also known as the Air Charge Temperature (ACT) sensor, is located in the intake manifold and acts as a resistor changing value with air temperature. Problems with the IAT sensor may set a diagnostic code. Check the reference voltage and measure resistance across the sensor 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. Check for battery voltage to the power steering pressure switch and continuity to brake light bulbs. The Brake On/Off (BOO) switch indicates brake application to the PCM. Issues with the BOO switch or circuit may affect idle quality. Check for battery voltage to the BOO 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 for reference voltage and resistance of the EVP sensor. Apply vacuum and check resistance change. Replace the EVP sensor if necessary. The Knock Sensor (KS) detects engine detonation, sending a voltage signal to the PCM to retard spark timing. Check for reference voltage to the knock sensor and simulate operating conditions to observe timing response. Replace the knock sensor if it does not respond. The Idle Air Control (IAC) or Bypass Air Idle Speed Control (BPA-ISC) solenoid controls idle speed by regulating air bypassing the throttle body. Check for the PCM signal voltage, inspect the pintle for carbon deposits, and check the resistance of the solenoid. Clean the IAC valve housing and install a new O-ring during replacement. The Mass Airflow (MAF) sensor measures air entering the engine using a hot wire sensing element. Check for power to the MAF sensor and voltage signals at idle and increased engine speed. Disconnect the MAF sensor and check for resistance. Replace the MAF sensor if necessary. The Manual Lever Position (MLP) sensor on the transmission indicates the gear position to the PCM. Check for power to each signal wire and adjust the switch if necessary. Further diagnostics require specialized equipment.

The coolant temperature indicator system consists of a light or temperature gauge on the dashboard and a coolant temperature sending unit on the engine. It is important to check the coolant level and ensure the wiring and fuses are intact if an overheating indication occurs. When the ignition switch is turned on and the starter motor is turning, the indicator light should glow. If the light is not on, it may be due to a burned-out bulb, faulty ignition switch, or open circuit. Testing the circuit by grounding the wire to the sending unit can help determine the issue. Once the engine starts, the light should go out unless the engine overheats. Failure of the light to go out may be caused by a grounded wire, defective sending unit, or faulty ignition switch. It is also important to check the coolant type and mixture. If the sending unit needs to be replaced, 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. Finally, check the coolant level after installing the replacement unit.

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

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.

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.

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.

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.

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

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.

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

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.

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

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

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.