Hummer 19418807 SENSOR ASM,MAP

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Various engine sensors and components have checking procedures,the engine coolant temperature (ECT) sensor is a thermistor that changes resistance with temperature, and a failure in the circuit can cause trouble codes. The resistance should be measured when cold and warm while ensuring reference voltage from PCM is around 5.0 volts for the verification. Manifold Absolute Pressure (MAP) Sensor monitors changes in intake manifold pressure then varies its voltage output accordingly. Look at the reference voltage and signal voltage with the ignition on and engine off, and observe voltage changes as the engine's vacuum changes. Intake Air Temperature (IAT) Sensor acts as a thermistor where you can measure its resistance at different temperatures to make sure it changes as expected. Also, use a scan tool to monitor the IAT sensor for performance. The oxygen sensor in exhaust detects oxygen content which you can check its millivolt signal while warming up your engine. Check whether the oxygen sensor heater has correct voltage or not. Vehicle Speed Sensor (VSS) provides speed data to PCM which can be checked for reference voltage. Depending on the type of engine, Camshaft Sensor and Crankshaft Sensor should be checked for resistance and proper signal output. Finally, Knock Sensors detect engine knock which should be checked for reference voltage and resistance. If any component fails these checks, replacement may be necessary.

The Manifold Absolute Pressure (MAP) sensor is a device for monitoring the pressure variations in the intake manifold that occur due to changes in engine load and speed and then converting this into voltage. The PCM gets its information as a varied voltage signal from closed throttle (high vacuum) to wide open throttle (low vacuum). The PCM utilizes the MAP sensor in controlling fuel delivery as well as ignition timing. To swap the MAP sensor, start by disconnecting its electrical connector. This can be achieved by unplugging the electrical connector of map sensor, squeezing together the retainer tabs and removing it, then pulling up on the sensor until it comes out vertically from its mounting flange on top of intake manifold. Thereafter, inwardly squeeze retainer tabs of the sensor so as to detach it from manifold's mounting flange. At last, raise straightaway sensor for detaching it away. Finally, put everything back where you found it during removal.

To remove the 2.4L MAP sensor, begin by removing the engine cover and disconnecting the air cleaner outlet duct from the throttle body. Disconnect the connector from the sensor and unscrew the mounting bolt and the sensor.

Start by turning the ignition key to the OFF position.

To install, reverse the removal steps and remember to use a new o-ring and tighten the hold-down bolt securely.

The sensor is located on the right side of the charge air cooler cover.

Remove the oil filler cap, then remove the right-side engine cover. Disconnect the electrical connector from the MAP sensor. Pull the MAP sensor out of the intake manifold.

Start by disconnecting the MAP sensor electrical connector located on top of the intake manifold above the throttle body.

The MAP sensor on V8 models is located on the intake manifold, right behind the throttle body.

The intake air temperature (IAT) sensor acts as a thermistor. To check it, you can measure its resistance at different temperatures to ensure it changes as expected. Additionally, you should monitor the IAT sensor using a scan tool to verify its performance.

The intake air temperature (IAT) sensor acts as a thermistor. To check it, you can measure its resistance at different temperatures to ensure it changes as expected. Additionally, you should monitor the IAT sensor using a scan tool to verify its performance.

Installation is the reverse of removal.

The MAP sensor on V8 models is located on the intake manifold, right behind the throttle body.

Check the condition of the grommet and replace if necessary for 2004 and earlier models. Replace the sensor if the seal is damaged for 2005 and later models. Installation is the reverse of removal.

The knock sensors detect engine knock. To check them, you should check for reference voltage and resistance.