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Auto Repair » Engine » The Right Way to Clean the MAP Sensor

CHECK DIY - PRO

THE RIGHT WAY TO CLEAN THE MAP SENSOR

Reviewed by

Richard McCuistian, ASE Certified Master Automobile Technician

Technical Reviewer at CarParts.com

Written by CarParts.com Research Team - Updated on June 12th, 2024

Reading Time: 6 minutes
Summary
* The powertrain control module uses the MAP sensor to sense engine load on
speed-density-type fuel injection systems.
* MAP sensor cleaning is a fairly straightforward process that requires simple
items like a MAP sensor cleaner, soft rag, and brush.
* A failing or dirty MAP sensor can cause your vehicle to exhibit symptoms like
misfiring, stalling, and rough running.

Contents hide
1. MAP Sensor Basics
2. Can a MAP Sensor Be Cleaned?
3. Deciding Whether the MAP Sensor Needs Cleaning
4. How to Remove the MAP Sensor
5. How to Clean the MAP Sensor
6. Tech Tips When Cleaning the MAP Sensor
7. Testing the MAP Sensor
7.1. Using a Digital Multimeter or Scope
7.2. Using a Scan Tool
8. Bad MAP Sensor Symptoms
9. MAP Sensor Replacement Cost

Vehicle maintenance is more than a car wash, tire change, or an oil change. For
dedicated drivers, maintenance means dealing with the nitty-gritty, including
popping the hood and cleaning every dirty part they can find.

The MAP sensor is often overlooked during regular maintenance checks, but it’s a
part that often gets contaminated with dirt, which is why you need to clean it
regularly.

Here’s a simple guide on how you can clean it the right way.

MAP SENSOR BASICS

Diving into the basic functions of the manifold absolute pressure (MAP) sensor
will help you understand why it’s important to clean it regularly and replace it
when needed.

The powertrain control module uses the MAP sensor to sense engine load on
speed-density-type fuel injection systems.

Pro Tips are nuggets of information direct from ASE-certified automobile
technicians working with CarParts.com, which may include unique, personal
insights based on their years of experience working in the automotive industry.
These can help you make more informed decisions about your car.

Pro Tip: Low vacuum means more load on the engine. With a vacuum gauge connected
to the engine you can watch the reading change and compare it to the MAP
readings on your scan tool datastream to see if the actual gauge reading agrees
with the MAP sensor. Vacuum is measured in inches of mercury, (Hg) and you can’t
have more than 30 inches of vacuum no matter what you do.

Determining the engine load is crucial to determining the right amount of fuel
the engine needs. The MAP sensor is also used as a backup sensor to the mass air
flow (MAF) sensor on some engines and is also the input some systems use for EGR
flow feedback. Chryslers and Jeeps used MAP sensors and stayed away from MAF
sensor systems for many years.

The MAP sensor also doubles as a BARO sensor when the key is first switched on,
determining the altitude to adjust fuel delivery and spark timing accordingly.

It also plays a crucial role in diagnosing issues related to the exhaust gas
recirculation (EGR) system. If the MAP sensor doesn’t react to the specified
drop in the manifold vacuum, an EGR flow rate trouble code may be set.

CAN A MAP SENSOR BE CLEANED?

Absolutely. MAP sensor cleaning is a fairly straightforward process, and it only
takes a few items to get the job done, including the following:

* Electric parts cleaner (preferably a manufacturer-recommended MAP sensor
cleaner)
* Soft rag or paper towel
* Brush

Experts recommend cleaning the MAP sensor every 30,000 to 50,000 miles as part
of your vehicle’s regular maintenance.

DECIDING WHETHER THE MAP SENSOR NEEDS CLEANING

If your vehicle accelerates poorly and your fuel mileage is poor, and you notice
slow response to MAP pressure readings when changing throttle angle and watching
the sensor using a scan tool data stream display or when using a meter (while
driving), there could be base engine issues. But before you pursue more
expensive diagnostic paths, it might pay to start with the simple and easy.

First, inspect the MAP sensor’s electrical contacts. You might not see anything,
but use some electrical contact cleaner anyway and retest.

If there is no change, remove the sensor from the manifold or disconnect the
hose and check to make sure there is no PCV sludge clogging the port where the
MAP sensor reads manifold pressure. If there is, carefully clean it out and
retest.

If there is still no change in the results, substitute a known good MAP sensor.
Once you’ve eliminated the MAP sensor and its circuit, your problem may be
somewhere else.

> If your vehicle accelerates poorly and your fuel mileage is poor, and you
> notice slow response to MAP pressure readings when changing throttle angle and
> watching the sensor using a scan tool data stream display or when using a
> meter (while driving), there could be base engine issues.
>
> – Richard McCuistian, ASE Certified Master Automobile Technician

HOW TO REMOVE THE MAP SENSOR

Removing the MAP sensor properly is crucial when you’re attempting to clean the
sensor thoroughly.

First things first, turn off the ignition and disconnect the battery to avoid
electrical issues from popping up during the process.

In most cases, the MAP sensor can be found on or near the intake manifold, which
is on the right side of the engine. The sensor should be behind the throttle
body and attached to an electrical connector.

For some vehicles, the MAP sensor might be hidden behind the vacuum hose, which
you’ll need to remove to get a better view of the sensor.

Unhook the vacuum line from the MAP sensor, and unscrew the bolts or screws that
are mounting the sensor to your vehicle. Unhook the electrical connector, and
you should be able to pry out the MAP sensor from its place.

HOW TO CLEAN THE MAP SENSOR

When cleaning the MAP sensor, it’s important to hold it face down to prevent
debris from contaminating the area.

Only use a manufacturer-recommended MAP sensor cleaner when cleaning the inside
and outside parts of the sensor.

Use a soft rag or paper towel to wipe the housing, and proceed with spraying the
cleaner into the sensor port. Shake out the excess cleaning solution, and let
the MAP sensor dry.

You can also use the same cleaner with a brush to clean the vacuum hose and
intake manifold port.

TECH TIPS WHEN CLEANING THE MAP SENSOR

Cleaning the MAP sensor might seem like a simple task, but it’s extremely
important to exercise caution when doing so. Make sure to wear durable gloves
and safety glasses to protect your skin and eyes.

It’s also best to avoid physically touching the sensor and using compressed air,
as it can be too harsh on the chip.

Stick to recommended cleaners for the MAP sensor. Avoid using carburetor and
brake cleaners, as these can leave residue inside the sensor, compromising its
operation.

TESTING THE MAP SENSOR

Reinstalling the clean MAP sensor doesn’t mean it’ll work like it’s as good as
new. Once you’ve returned the MAP sensor to its proper place, the next step is
to test it out.

There are a couple of ways to test a MAP sensor: using a digital multimeter
(DMM), scope, or scan tool.

USING A DIGITAL MULTIMETER OR SCOPE

To test the MAP sensor using a DMM or scope, use jumper wires, T-pins, or a
breakout box to access the sensor’s wiring.

Turn the ignition off, and measure the voltage or frequency of the sensor
output. Then, use a hand-operated vacuum pump to apply vacuum to the sensor.

You’ll know that the MAP sensor is working as it should when it changes voltage
or frequency in relation to the applied vacuum.

A stagnant signal or out-of-range values could mean that the sensor needs to be
replaced.

USING A SCAN TOOL

A scan tool can help you determine the condition of the MAP sensor by monitoring
the injector pulse width when vacuum is applied to the sensor.

Apply about 20 in. Hg of vacuum to the MAP sensor and start the engine. Observe
the injector pulse width. If the engine is warm enough, the readings should
range from 1.5 to 3.5 ms.

Slowly reduce the vacuum to the MAP sensor. The injector pulse width should
increase because the low vacuum puts additional load on the engine.

BAD MAP SENSOR SYMPTOMS

A functioning MAP sensor can optimize your engine’s performance and fuel
economy. Meanwhile, a failing one can cause your vehicle to exhibit symptoms
like misfiring, stalling, and rough running.

Nobody wants to deal with a poor-performing vehicle. Aside from consuming too
much fuel, you also risk damaging other parts if you continue to drive it
around.

Heat and excessive vibrations can cause the MAP sensor to wear out faster than
its intended service life. Contaminants like dirt and engine oil can affect the
sensor as well.

MAP SENSOR REPLACEMENT COST

Cleaning a dirty MAP sensor can only do so much. If the sensor is too far gone,
there’s no other solution but to replace it with a new one.

You can expect to pay anywhere between $110 and $130 for a new MAP sensor. Labor
fees for the installation process can cost around $38 to $48.

SHARE THIS STORY

About The Authors
Reviewed By
Richard McCuistian
Technical Reviewer at CarParts.com

Richard McCuistian has worked for nearly 50 years in the automotive field as a
professional technician, an instructor, and a freelance automotive writer for
Motor Age, ACtion magazine, Power Stroke Registry, and others. Richard is ASE
certified for more than 30 years in 10 categories, including L1 Advanced Engine
Performance and Light Vehicle Diesel.

Written By
CarParts.com Research Team
Automotive and Tech Writers

The CarParts.com Research Team is composed of experienced automotive and tech
writers working with (ASE)-certified automobile technicians and automotive
journalists to bring up-to-date, helpful information to car owners in the US.
Guided by CarParts.com's thorough editorial process, our team strives to produce
guides and resources DIYers and casual car owners can trust.

Any information provided on this Website is for informational purposes only and
is not intended to replace consultation with a professional mechanic. The
accuracy and timeliness of the information may change from the time of
publication. Read our full disclaimer here.

KEEP READING: RELATED POSTS

* Bad MAP Sensor Symptoms
* How to Check if Your MAP Sensor is Bad
* P0109 Code: MAP / BARO Sensor Circuit Intermittent
* The Top 5 Bad Crankshaft Position Sensor Symptoms
* P0107 Code: Manifold Absolute Pressure Sensor / Barometric Sensor Low
* P0198 Code: Engine Oil Temperature Sensor Circuit High

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John

2 months ago

An interesting and thorough article about how MAP Sensors work, the importance
of their correct input to a properly running engine, how to clean and maintain
the MAP sensor, and methods to diagnose and test if a sensor is good, bad or
starting to fail and if it needs to be replaced.

Another good article reviewed by Richard McCuistian.

Now, I want to buy some MAP Cleaner and clean my car’s sensor for preventative
maintenance and will continue to do so in the future. It’s certainly an
inexpensive procedure and easy enough for a week-end mechanic. Thanks for the
informative article.

0
Reply

John

2 months ago

Notes to the writer(s):

Using a Digital Multimeter or Scope

“To test the MAP sensor using a DMM or scope, use jumper wires, T-pins, or a
breakout box to access the sensor’s wiring.”

If the term “scope” if referring to an Oscilloscope, it would be helpful to
clarify that, since there is also an Endo-“Scope” often used in diagnosing car
problems. Endoscopes are relatively inexpensive and many DIYers may own
one. Oscilloscopes, on the other hand are expensive and require training to use.
Professional mechanics may own one, but I doubt many DIYers own or even know how
to use one. That method of testing is best left for a professional mechanic –
not a DIYer.

“Turn the ignition off, and measure the voltage or frequency of the sensor
output.”

Question: If the engine is turned OFF. Why would there be any voltage or
frequency generated by a non-running engine? Shouldn’t there be no power to the
sensor?

Last edited 2 months ago by John
0
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