Mercury F8AZ-7F293-AA Sensor - Man. Lever Position - Mlps

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The Transmission Range (TR) sensor informs the PCM about gear positions and activates the back-up lights. If the engine starts in any gear other than Park or Neutral, the TR sensor might be faulty. To test, raise the vehicle, switch the ignition to On, and shift into Reverse. If back-up lights don't come on, detach the shift cable, adjust the sensor until lights illuminate, then reattach the cable. If lights still don't come on, check the circuit and back-up lights. To replace the sensor, raise the vehicle, unplug the sensor's electrical connector, detach the shift cable, and remove the sensor. Install a new sensor, ensure correct adjustment, tighten the screws, then lower the vehicle.

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.

For 1988 through 1991 models and 1992 models with AOD transmission, to check the operation of the neutral start switch, apply the parking brake and attempt to start the engine in each position of the selector lever; the engine should only start in Park and Neutral. If it starts in any other position, adjust the shift linkage and retest. If the engine still starts in any position other than Park or Neutral, replace the switch. To replace the switch, disconnect the cable from the negative battery terminal, place the shift lever in Low, and apply the parking brake. Raise the vehicle and secure it on jackstands, then unplug the electrical connector from the neutral start switch. Carefully remove the switch and O-ring, install the new switch and O-ring, and tighten it. Reinstall the electrical connector and reconnect the negative battery cable. Verify that the engine starts only when in Park or Neutral. For 1992 models with AODE transmission and all 1993 and later models, note that the AODE and 4R70W transmissions do not have a neutral switch; this function is incorporated into an information sensor known as the Manual Lever Position (MLP) sensor or, for 1995 and later models, the Transmission Range (TR) sensor. For adjustment details, consult the relevant information.

For 1988 through 1991 models and 1992 models with AOD transmission, to check the operation of the neutral start switch, apply the parking brake and attempt to start the engine in each position of the selector lever; the engine should only start in Park and Neutral. If it starts in any other position, adjust the shift linkage and retest. If the engine still starts in any position other than Park or Neutral, replace the switch. To replace the switch, disconnect the cable from the negative battery terminal, place the shift lever in Low, and apply the parking brake. Raise the vehicle and secure it on jackstands, then unplug the electrical connector from the neutral start switch. Carefully remove the switch and O-ring, install the new switch and O-ring, and tighten it. Reinstall the electrical connector and reconnect the negative battery cable. Verify that the engine starts only when in Park or Neutral. For 1992 models with AODE transmission and all 1993 and later models, note that the AODE and 4R70W transmissions do not have a neutral switch; this function is incorporated into an information sensor known as the Manual Lever Position (MLP) sensor or, for 1995 and later models, the Transmission Range (TR) sensor. For adjustment details, consult the relevant information.

Verify that the engine starts only when the selector is in the Neutral and Park positions.

Deactivate the air suspension system by turning off the air suspension switch, which is located on the right kick panel.

1. Raise the vehicle and support it securely on jackstands. 2. Turn the ignition switch to On, put the shift lever in Reverse, and verify that the back-up lights come on. 3. If the back-up lights come on but the engine can't be started in Park or Neutral, or it can be started in any gear other than Park or Neutral, the sensor is probably defective. 4. If the back-up lights don't come on, detach the shift cable from the manual lever, loosen the sensor retaining bolts, move the sensor slightly until the back-up lights come on, then tighten the sensor retaining bolts and reattach the shift cable. 5. If you can't get the back-up lights to come on by moving the sensor slightly, verify that the back-up lights and the back-up light circuit are okay. If the back-up lights and circuit are okay, the sensor is probably bad.