2009 dodge journey map sensor

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MAP Sensor - How It Works - Instructional Video

By Summer Solstice September 6, 2019 in Engine & Transmission

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Summer solstice.

I ran across this video. There are often questions from forum residents about the MAP sensor. This video goes into nice detail about how it works and how it is affected by various conditions. Pt1 and Pt.2 amounts to about 40 minutes. This is a general instructional video and is not Journey specific.

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• 4 months later...

I am not the SAME 'Asshat' as the one he refers to who corrected him on referring to the MAP as "Manifold AIR Pressure" and "He (Asshat #1)  obviously does NOT know what he's talking about."  Well, let me clear that up. I think Hat #1 is probably either an engineer OR he's smarter than the dude in this video, who actually IS very bright and DOES know his subject well. Unfortunately, like a lot of smart people, he won't let anyone be smarter than himself, which is the wring way to do life.

The key is in the middle word. Absolute vs Air. I agree with VideoMan here that the MAP is actually sensing AIR pressure, it can be no other way. But there are TWO ways of referring to the pressure of a gas. The first, and more familiar to the general public is called GAUGE pressure. You've seen "PSIG" all over the place, right? Well, that 'G' at the end stands for GAUGE. As in 'Pounds Per Square Inch GAUGE'. As an engineer, I usually use the term "PSIA" when speaking of the pressure of a gas. PSIA means 'Pounds Per Square Inch ABSOLUTE'. The difference is what we refer to as 'Atmospheric Pressure". At sea level, that is 14.7 pounds per square inch. It is the weight of a column of air ONE INCH SQUARE that extends from sea level to what we call the upper limit of the atmosphere. That is an "absolute" pressure, it has no REFERENCE point except that of NO pressure AT ALL.

GAUGE pressure, on the other hand refers to a gauge that has mechanisms in place that REMOVE the 14.7 psi from the reading FOR you. This is GAUGE pressure. But there are ABSOLUTE gauges out there. A good example is the gauges used in air conditions and refrigeration work. THEY are measuring the pressure inside a closed system that doe not in any way communicate with the outside, The pressure inside that system is ...wait for it....absolute. That pressure does not have to account for the weight of air, it is measuring only the pressure of the gas in the system.  back to the show...

The MAP sensor is actually measuring the ABSOLUTE pressure within the manifold, not the GAUGE pressure. The difference here may just be semantic to you, but to engineers, it denotes a vastly different type of fish. While the manifold does directly communicate with the outside air, the pressure inside the manifold is not created by the outside air directly, but rather by the sucking action of the pistons pulling air into the manifold. And in this sense, we are dealing with an ABSOLUTE pressure, not a GAUGE pressure. So the CORRECT term IS Manifold Absolute Pressure.

Thank you. We now return you to your regularly scheduled programming.

• OhareFred , jkeaton and detroitgrip

I would never argue with you!

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Dodge Journey P0108:  MAP Barometric Sensor → High Input 

P0108 is a generic OBD-II trouble code.  It indicates your Dodge Journey’s MAP (manifold absolute pressure) sensor’s voltage reading is outside of the normal operating range.  The voltage is too high.  It’s most commonly caused by a bad MAP sensor, wiring issue, or vacuum leak.

The MAP sensor measures the air pressure coming into your Journey’s engine and sends that signal to the ECM.  It does this by sending a voltage ranging from 1 to 5 volts.  1 volt would be idle speed.  The signal should be at 5 volts whenever the vehicle is at wide open throttle.   P0108 is triggered whenever the signal from this wire is MORE THAN 5 volts, which shouldn’t happen.

P0108 can also trigger if the ECM thinks the voltage coming from the MAP sensor is higher than it should be at any given time.

P0108 Quick Facts

• P0108 is caused when there’s too much voltage coming from the MAP sensor to the ECM.
• Most commonly caused by a bad MAP sensor.  Vacuum or wiring issue are the next most common causes.
• Usually results in a rough running vehicle.
• A voltage meter is required to diagnose the MAP sensor.

P0108 Symptoms:  Dodge Journey

P0108 is always going to do more than just trigger the check engine light .  The MAP sensor is vital to a well running vehicle.  If it’s gone bad, it’ll really affect drivability.

Here are the most common symptoms of P0108:

• Poor Gas Mileage
• Rough Running/Stalling Engine
• Motor Won’t Start at All
• Black Exhaust Smoke
• Check Engine Light

Dodge Journey P0108 Causes + Diagnosis

When diagnosing this code, if your Journey is running fine you should first reset the code and take the vehicle out and try to reproduce the problem.  It may have just been a one time thing.

The first thing that you should do is test the MAP sensor itself.  A good voltmeter is necessary for this step.  You can get them pretty cheap from any hardware store or Amazon.  The reading from the voltmeter should be around 1 to 1.5 volts at idle.  If it’s higher, you may need a new MAP sensor .

Here’s a pretty good YouTube video that shows exactly how you would go about testing the sensor:

Vacuum Leak

A vacuum leak is a very common reason that P0108 is triggered.  If there isn’t enough vacuum going to the MAP sensor it’ll give a higher voltage reading than the operating conditions suggest should be there.

The vacuum supply to the MAP sensor could have a leak, or there could be a vacuum leak around the engine as a whole.  Check all the vacuum lines on the engine.  Check to see if any of them appear to be brittle, melted or cracked.  If they are, replace them and see if that solves the problem.

Another place that vacuum can leak from the intake manifold.  Here’s a solid article from Popular Mechanics on how to track down a vacuum leak .

Wiring Issues

The easiest thing that you can do when P0108 is triggered is check your Journey’s wiring harness.  Is it plugged in to the MAP Sensor tightly?  Does it have any visible signs of damage?  Follow it as far as you can and make sure.  It’s going to have a ground wire.  Make sure that ground is plugged in tightly.  Here’s a good video on how to find a short in a vehicle.

While the three causes listed above are the most common reasons P0108 shows up, there are other reasons as well.  If your Journey’s motor is worn out and isn’t producing a good vacuum anymore, that’ll cause the MAP sensor to output a higher voltage at all times and throw the code.

It’s also possible that an engine that is misfiring or has low fuel pressure can trigger this code as well.  It would need to be a pretty noticeable misfire.  You should also get P0300 or P030X (X representing the cylinder number of the misfire) with P0108 if misfiring was the case.

Conclusion:  P0108 Journey

While it is most likely to be the MAP sensor itself that is causing P0108 in your Dodge Journey, properly identifying the problem can save you from purchasing and installing a sensor that you don’t need  If there is anything that you would like to add, please leave a comment below.  Good luck!

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10 Signs Of A Bad Or Failing MAP Sensor

• Updated: March 6, 2023

The manifold absolute pressure sensor, also known as the MAP sensor, is an important part of the car’s engine management system.

The MAP sensor is found in vehicles with fuel injection, and the primary function of the MAP sensor is to provide the Powertrain Control Module (PCM/ECM) with information about the pressure in the intake manifold.

Like every sensor in your vehicle, the MAP sensor will wear and tear over time and become damaged, which can lead to incorrect data being transmitted to the engine control module. So what happens when a MAP sensor fails? Here’s a quick overview of the signs to look for.

Symptoms Of A Bad MAP Sensor

The most common symptoms of a bad MAP sensor are bad fuel consumption and a check engine light on your dashboard. You may also notice signs like a misfiring or stalling engine. Rough idle or difficulty starting are also common.

Any problem with the manifold absolute pressure sensor (MAP) will result in improper combustion, damaging the engine and disrupting its performance.

Here is a more detailed list of the signs of a bad or failing MAP sensor you should look for:

1. Check Engine Light

The engine control unit constantly monitors all the sensors in your car engine while you drive the car. If one of these sensors’ values is out of the specified range, the check engine light will show up.

Therefore, if your MAP sensor sends wrong information to the engine control unit, the check engine light will appear on your dashboard.

2. Lean Air-fuel Mixture

The MAP sensor’s primary purpose is to measure the air pressure in the intake manifold to calculate the right air-fuel mixture for your engine. If the sensor is bad, it may cause your engine to get a too lean air-fuel mixture.

Lean fuel mixture can cause many strange symptoms in your engine, which you will find further down in this list.

3. Rich Air-fuel Mixture

The same thing applies the other way around as well. If the MAP sensor is bad, it can also send a faulty signal, which will cause the engine control unit to inject too much fuel into the car engine.

A rich air-fuel mixture will not only cause your fuel consumption to go up, but it will also cause performance problems.

4. Stalling or Rough Idle

If your air-fuel mixture is too rich or too lean, caused by a faulty MAP sensor, you may notice problems at the engine’s idle. When the engine is running at idle, it is very sensitive, and therefore you may first notice a faulty air-fuel mixture at idle.

Many other faulty parts can also cause this, so it should be diagnosed properly before you replace the MAP sensor.

5. Misfires

Misfires occur when the combustion inside the engine cylinder fails. This can happen due to a wrong air-fuel mixture or a bad spark. A MAP sensor may actually cause the air-fuel mixture to become so bad that you may notice misfires.

You can often recognize misfires by listening to your engine. If you can hear small bumps or if it doesn’t sound like it usually sounds, it may be caused by misfires.

6. Increased Emission Level

If the manifold absolute pressure sensor (MAP) is damaged, it can send an incorrect signal to the powertrain control module (PCM), indicating a high or low engine load.

To have a good emission level in your car, the air-fuel mixture needs to be perfect. Even a slight error with the MAP sensor may cause the fuel mixture to disturb the emission levels.

7. Bad Engine Performance

As I mentioned earlier, a faulty fuel mixture will cause the engine performance to drop. A lean mixture usually causes decreased engine performance, but it can absolutely be caused by a too rich mixture as well.

Bad engine performance can also be caused by misfires caused by a bad MAP sensor, as discussed earlier in the article.

8. Backfires

Backfires happen when the fuel going through your engine is not combusted properly. When the fuel is not ignited in the combustion chamber, it may end up in the exhaust pipe. As you may suspect, the exhaust pipe becomes really hot , and this can ignite the air-fuel mixture there.

This will cause loud bangs coming from the exhaust system, and this can actually cause your mufflers, etc., to explode. It can also cause your car to catch on fire if you are unlucky.

9. Hard Starting Condition

A faulty MAP sensor also causes problems when starting the car. The car’s trip computer uses the MAP sensor to determine the air pressure before starting the engine.

The engine is very sensitive to having the right air-fuel mixture at the starting moment, and therefore, a faulty reading can cause too little fuel to be delivered to the engine. As a result, the engine may not start at all.

10. Changed fuel consumption

This is most probably the most understandable if you read everything above in the article. A faulty air-fuel mixture caused by a bad MAP sensor will, of course, also cause the fuel consumption to change.

If you notice that your car requires less or more fuel than before, it can absolutely be caused by a faulty MAP sensor.

MAP sensor location

The MAP sensor is located on the intake manifold on most car models. It can also be installed on the car’s body on a vacuum hose going from the intake manifold.

The position of the MAP sensor depends on your car’s design, and it is recommended that you check the exact position of the MAP sensor in your car in the service manual.

MAP Sensor Replacement Cost

The average MAP sensor replacement cost is between $60 and $170, depending on the car model and labor costs. Labor costs between $30 and $70, while the sensor itself costs between $30 and $100,

The MAP sensor replacement is often relatively easy, and this is something you can do yourself at home on most car models. If you have a little bit of car knowledge, you can easily save some money by doing it yourself.

Diagnosing a Bad MAP sensor

Diagnosis of a faulty or failing MAP sensor can be made by first observing the present symptoms in your vehicle and then conducting a physical test as a diagnostic procedure.

The easiest way to test the MAP sensor is to connect a Diagnostic scanner to check the value of the MAP sensor. When the engine is switched off but the ignition on, you should get a reading of close to 1 bar or 14.5 psi.

Check this video for the procedure of testing a MAP sensor: MAP sensor testing .

Here is a brief step-by-step guide that you can follow to check, test, and diagnose if the MAP sensor in your vehicle has gone wrong.

• Locate the MAP sensor of your engine by checking yourself or referring to the service manual of your vehicle
• Ensure that the vacuum hose attached to the MAP sensor is connected correctly and is in excellent condition.
• Check to see if the connections and the electrical wires are in good condition.
• Clean the sensor with an electronic cleaner and recheck the values with your diagnostic scanner.
• Test the MAP sensor after these instructions .
• Measure the wirings between the engine control unit and the MAP sensor.
• Replace the MAP sensor if faulty, otherwise repair wirings.

Can I drive my car with a bad map sensor?

A bad map sensor causes the air-fuel mixture to get too lean or too rich. This can cause your engine to have performance problems, so it is not recommended to drive with a bad map sensor. If your car is running fine, you can drive slowly to the closest repair workshop.

How can you tell if a map sensor is bad?

You will mostly notice a bad MAP sensor by seeing a check engine light on your dashboard. By using a diagnostic tool, you can check the values the MAP sensor sends to the ECU to determine if it is bad or not.

How much does it cost to fix a map sensor?

The MAP sensor itself is often relatively cheap, and you can usually replace it yourself at home. The cost of the sensor is 30-70$, and the labor work 30-100$.

Can a map sensor be cleaned?

Yes. There will often be soot and other debris on the MAP sensor’s measure head over time. This can usually be cleaned with an electrical cleaner. Be careful that you do not damage the sensor. In some cases, you have to replace the sensor.

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2009 Dodge Journey - Oxygen Sensor

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Bosch oxygen sensor, ntk oxygen sensor, multiple applications, denso oxygen sensor, what does an o2 sensor do.

Oxygen sensors, often also called O2 sensors, lambda sensors, or air-fuel ratio sensors, measure the oxygen concentration in your exhaust, communicating this information to the engine control module (ECM) to adjust the fuel mixture. This helps ensure that your vehicle is running as efficiently as possible, and minimizes emissions of unburned fuel that could damage the catalytic converter. Most vehicles have at least two O2 sensors: an upstream sensor located ahead of the converter, and a downstream sensor found behind the converter. In vehicles with dual exhaust or V-style engines, it's also possible for there to be two upstream and two downstream sensors as well. Fuel ratio information from the upstream and downstream oxygen sensors is interpreted by the computer to determine what adjustments are necessary for peak performance and efficiency.

Bad O2 Sensor Symptoms

The most common sign of a failing or damaged oxygen sensor is the Check Engine light appearing on the dash. This occurs because the engine computer has detected an abnormally high or low concentration of unburned hydrocarbon or fuel in the exhaust either ahead, behind, or on both sides of the catalytic converter. Your Check Engine light may blink or stay on constantly, but in either case, should be addressed to determine the source of the problem. If you believe your O2 sensors may be causing your Check Engine light, visit your local O'Reilly Auto Parts for free Check Engine light testing .

Though the Check Engine light will likely activate in any case, there are other symptoms that may accompany this warning if your oxygen sensors are failing. These include:

• Rough or erratic idle
• Misfiring or stalling
• Reduction in performance or power
• Significant decrease in fuel economy
• Increased emissions or a failed emissions test

If you notice these issues, you can be certain that something is wrong with your engine, which may include a damaged or worn O2 sensor, or a variety of other issues. If your Check Engine light test is inconclusive, further diagnosis or a professional service center may be necessary to make your repair.

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Transmission Range Sensor - Mopar (4659676AC)

2001-2020 Mopar - 4659676ac

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• SKU: 4659676AC
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• Notes: Engines: 1.6l i4 sohc 16v smpi. 2.0l i4 sohc 16v smpi engine. 2.4l i4 dohc 16v dual vvt engine. 2.4l i4 pzev 16v dual vvt engine. 2.7l v6 dohc 24 valve mpi engine. 2.0l i4 dohc 16v smpi engine. 2.4l i4 dohc 16v ho turbo engine. 2.4l i4 dohc 16v smpi engine. 2.4l i4 dohc 16v turbo engine. 2.4l i4 dohc 16v smpi engine. 3.3l v6 ohv engine. 3.3l v6 ohv ffv engine. 3.5l v6 high output 24v mpi engine. 3.8l v6 ohv engine. Transmissions: 4-speed automatic transmission. 4-speed automatic vlp transmission.
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