Ford E1AZ-12A648-A Sender Assembly

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The coolant temperature indicator system consists of a gauge in the instrument panel and a sending unit on the engine. Check coolant level and wiring if overheating indication occurs. Gauge should start at Cold and move to Normal when engine is started. Disconnect wire from sending unit and gauge should be at Cold mark. Ground sending unit wire and gauge should move to Hot mark. If not, problem may be in gauge or wiring. If it does, sending unit is defective. Wrap new sending unit threads with Teflon tape. Remove radiator cap, replace sending unit quickly to minimize coolant loss. Tighten sending unit, attach wire, and check coolant level.

The coolant temperature indicator system consists of a gauge in the instrument panel and a sending unit on the engine. Check coolant level and wiring if overheating indication occurs. Gauge should start at Cold and move to Normal when engine is started. Disconnect wire from sending unit and gauge should be at Cold mark. Ground sending unit wire and gauge should move to Hot mark. If not, problem may be in gauge or wiring. If it does, sending unit is defective. Wrap new sending unit threads with Teflon tape. Remove radiator cap, replace sending unit quickly to minimize coolant loss. Tighten sending unit, attach wire, and check coolant level.

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 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.

This process pertains to standard analog instruments. Begin by examining the fuses if the coolant temperature gauge or light doesn't function. For an excessively high temperature indication, consider troubleshooting procedures. If the temperature gauge or light signals "Hot" soon after the engine starts, disconnect the wire at the coolant temperature sensor. Replace the sending unit if the gauge reading falls or the light turns off. High readings might indicate a shorted wire or a malfunctioning gauge. If the coolant temperature gauge doesn't register post engine warming, turn off the engine and disconnect the wire at the sending unit. Use a jumper wire to connect it to a clean engine ground. If the gauge now displays "Hot", replace the sending unit. If the gauge remains unresponsive, an open circuit or a defective gauge might be the cause. For replacement, initiate by removing the radiator cap to relieve pressure. Disconnect the electrical connector from the sending unit, and wrap Teflon tape around the threads of the new sending unit. Swiftly replace the old sending unit with the new one to avoid coolant loss. Securely tighten the sending unit and reconnect the wiring harness. Refill the cooling system and monitor for leaks and accurate gauge operation.

This process pertains to standard analog instruments. Begin by examining the fuses if the coolant temperature gauge or light doesn't function. For an excessively high temperature indication, consider troubleshooting procedures. If the temperature gauge or light signals "Hot" soon after the engine starts, disconnect the wire at the coolant temperature sensor. Replace the sending unit if the gauge reading falls or the light turns off. High readings might indicate a shorted wire or a malfunctioning gauge. If the coolant temperature gauge doesn't register post engine warming, turn off the engine and disconnect the wire at the sending unit. Use a jumper wire to connect it to a clean engine ground. If the gauge now displays "Hot", replace the sending unit. If the gauge remains unresponsive, an open circuit or a defective gauge might be the cause. For replacement, initiate by removing the radiator cap to relieve pressure. Disconnect the electrical connector from the sending unit, and wrap Teflon tape around the threads of the new sending unit. Swiftly replace the old sending unit with the new one to avoid coolant loss. Securely tighten the sending unit and reconnect the wiring harness. Refill the cooling system and monitor for leaks and accurate gauge operation.

The IAT sensor acts as a resistor changing value with air temperature. Test it by checking reference voltage and measuring resistance across the sensor terminals at different temperatures.

If an overheating indication occurs, the coolant level in the system should be checked. Additionally, the wiring between the light or gauge and the sending unit should be ensured secure, and all fuses should be intact.

The KS detects engine detonation. Test it by checking reference voltage, simulating operating conditions, and observing timing response.

The MLP sensor, now called the Transmission Range (TR) sensor, indicates transmission gear.

The coolant temperature indicator system consists of a light or temperature gauge mounted in the dash and a coolant temperature sending unit mounted on the engine.