How to test the MAP sensor ( 1999-2006 V8 Chevy )?
How to test the MAP sensor ( 1999-2006 V8 Chevy )?
The manifold absolute pressure (MAP) sensor, on the 1999-2006 V8 Chevrolet Silverado (Suburban, Tahoe) and GMC Sierra (Yukon, Yukon XL) can be easily tested with a simple multimeter. In this tutorial I’ll explain how to do it in a step-by-step way.
How does a MAP sensor work on a car?
What Does a Map Sensor Do? Basically, a MAP sensor reads the amount of air pressure in relation to vacuum inside the intake manifold, either directly or using a vacuum hose. Then, it translates this pressure into a voltage signal that the sensor feeds to the power control module (PCM), your car’s computer.
Can a bad MAP sensor cause engine failure?
MAP sensor on footwell inside engine compartment. A bad manifold absolute pressure (MAP) sensor can upset fuel delivery and ignition timing. Depending on your vehicle model, your engine might experience one or more of these performance problems: However, these symptoms are not exclusively symptoms of a failed MAP sensor.
How to test the voltage of the MAP sensor?
NOTE: The MAP sensor must remain connected to its electrical connector to test the MAP signal voltage. Ground the black multimeter test lead on the battery negative (-) terminal. Have your helper turn the key On but don’t start the engine. You should see a voltage around 4.5 Volts DC registering on your multimeter.
Where is the MAP sensor located?
The Manifold Absolute Pressure (MAP) sensor is located on the front of the throttle body. An L-shaped rubber fitting is used to connect the MAP sensor to throttle body.
Where is the MAP sensor located on the engine?
MAP Sensor Location The MAP sensor is usually located in a few key places around the upper engine bay area. Intake manifold. Under or near the throttle body; this is perhaps the most common place. Inner fender.
Where does the MAP sensor get its vacuum?
The PCM supplies voltage the MAP, in the form of 5 Volts on the wire labeled with the number 1. The PCM supplies Ground to the MAP on the wire labeled with the number 3. As the engine starts and the pistons start to create vacuum. This vacuum is supplied to the MAP sensor thru’ a plastic vacuum line.
What does a Chevy MAP sensor do?
The MAP sensor has two specific jobs. The first is to provide the fuel injection computer with a barometric pressure reading when you turn the key on but before you start the engine. The other, is to inform the fuel injection computer the intake manifold’s vacuum pressure when the engine is running (to determine engine load).
What should the pressure be on a MAP sensor?
At 20 “Hg, the MAP sensor will indicate about 5 psi. This is because the MAP sensor measures “absolute” pressure, based on a perfect vacuum, rather than atmospheric pressure. A failed MAP sensor has serious implications on fuel control, vehicle tailpipe emissions and fuel economy.
What does the Check Engine light on a MAP sensor mean?
Sometimes, a malfunction in the MAP sensor or its circuit will trigger the check engine light (CEL). Scanning the computer, you may find a P010X series of codes stored in memory. Here is a brief description of these codes: P0105: MAP sensor circuit malfunction.
The manifold absolute pressure (MAP) sensor, on the 1999-2006 V8 Chevrolet Silverado (Suburban, Tahoe) and GMC Sierra (Yukon, Yukon XL) can be easily tested with a simple multimeter. In this tutorial I’ll explain how to do it in a step-by-step way.
How does MAP sensor work on GM 4.3L?
Ground the black multimeter test lead directly on the battery negative terminal. Turn the key on but don’t start the engine. This will enable the manifold absolute pressure (MAP) sensor to get power in the form of 5 Volts and Ground from the PCM (Powertrain Control Module= Fuel Injection Computer).
MAP sensor on footwell inside engine compartment. A bad manifold absolute pressure (MAP) sensor can upset fuel delivery and ignition timing. Depending on your vehicle model, your engine might experience one or more of these performance problems: However, these symptoms are not exclusively symptoms of a failed MAP sensor.
At 20 “Hg, the MAP sensor will indicate about 5 psi. This is because the MAP sensor measures “absolute” pressure, based on a perfect vacuum, rather than atmospheric pressure. A failed MAP sensor has serious implications on fuel control, vehicle tailpipe emissions and fuel economy.
What should the voltage be on the MAP sensor?
Normal idle should be steady with no more than a 50 RPM variation. This was the first clue. The MAP voltage readings should range between 0.9 to 1.5 volts. This vehicle is high at times, indicating pressure pulses in the intake.
What should the vacuum be on a Silverado MAP sensor?
Increase the vacuum to 10 in. Hg and at this reading you should have between 3.0 and 2.8 volts. If your Silverado MAP Sensor does not respond with this range of voltage, it’s time for a pressure sensor replacement. Have any questions about our How To test a Silverado MAP Sensor guide?
What should the voltage be on a MAP sensor?
Your voltage reading should be between 4.6 and 5 volts. Apply 5 in-Hg of vacuum to the sensor. The readout should be about 3.75 volts. Now apply 20 in-Hg of vacuum to the sensor. The voltage should be about 1 volts. Your readings may vary slightly, depending on altitude and current weather conditions.
Where is the pressure sensor on a Chevy Silverado?
The pressure sensor in your Chevy Silverado is mounted to the intake manifold. This sensor is also known as the Silverado MAP Sensor, or manifold absolute pressure sensor. This unit is meant to read the barometric pressure of the air entering your engine.
