MAP sensor or Manifold Absolute Pressure sensor takes the pressure or vacuum in the intake manifold and converts it to an electrical signal for the PCM (Powertrain Control Module) to read. The PCM then knows how much fuel to send to the injectors and how much timing the engine needs.
At the bottom of the page is a YouTube video demonstrating how to test the sensor.
Where is the MAP Sensor located?
On the YJ Wranglers just look on the firewall just above the valve cover. It’s a small black or grey box with vacuum line going to it and a plug with 3 wires.
Will it trigger the check engine light if the sensor is faulty?
In most cases, yes it will trigger the DTC light. But, if it’s only a little out of voltage range, it may not. If your Jeep is running bad, run the DTC sequence to get the PCM to read the stored codes out to you. Click here to learn how to run the diagnostic sequence.
Why does it fail?
Heat and vibration from being under the hood can eventually take its toll on the busy little sensor.
How do you test a MAP sensor to see if it’s bad?
To start out with you will need a couple tools. Nothing terribly expensive, just a decent multi-meter, a hand held vacuum pump and possibly a small paper clip.
- Test to make sure you have input voltage first. You do this by turning the key to the “On/Run” position.
- Put the black lead of your multi-meter to the Negative (-) side of your battery.
- Set you meter to test DC voltage. With the red lead probe the wire closest to the vacuum line (passenger side wire). There should be ~5 volts coming from that wire. If not, there is an issue with the wiring or the PCM. If you have voltage, then we are good for this step.
- Next lets test to see if there is voltage coming from the middle wire. This is the wire that sends voltage to the PCM telling it how much load is on the engine. You may not get exactly what you got from the first wire, but it will be close to 5 volts. If you are getting close to 5 volts that also means that the 3rd (the one on driver side) wire being the ground wire is functioning fine.
- No voltage? If you are not getting any voltage out of that middle wire you either have a bad MAP or a bad ground going to the sensor.
- Test the ground wire next. Leaving the black lead on the Negative (-) battery post, change the setting on your multi-meter to test ohms it may have a symbol like this “Ω”. If you have solid ground you should get a reading close to Ω. If the meter settings don’t change from not touching to probing the wire, the wire isn’t grounded as it should be. Time to chase that wire to find the issue.
- Now lets say voltage and ground is good all across all 3 wires. Lets test the voltage sweep.
- Put the meter to test DC voltage and probe the middle wire. Again you should see close to 5 volts.
- Pull the engine vacuum line off the sensor and hook up the vacuum pump. Watching the voltage reading, slowly apply vacuum a little at a time.
- First apply 5 inches of vacuum, note the voltage reading. Now apply 10 inches of vacuum, note the voltage. Then 15 inches, note the voltage. There should be a steady transition throughout the voltage sweep.
- If the voltage is jumpy, spikes or voltage drops erratically through the transition of applying the vacuum. You have a bad MAP sensor and it's time to replace it.
Where is my MAP Sensor located and how do I get to it?
Mariah Sklaney check at the front of the intake manifold
The Manifold Absolute Pressure (MAP) sensor is mounted into the front of the intake manifold (Fig). An o-ring is used to seal the sensor to the intake manifold (Fig. 19).
(1) Disconnect electrical connector at sensor.
(2) Clean area around MAP sensor.
(3) Remove 2 sensor mounting screws.
(4) Remove MAP sensor from intake manifold.
(5) Check condition of sensor o-ring (Fig. 19).
The Manifold Absolute Pressure (MAP) sensor is mounted into the front of the intake manifold (Fig. 18). An o-ring is used to seal the sensor to the intake manifold (Fig. 19).
(1) Clean MAP sensor mounting hole at intake manifold.
(2) Check MAP sensor o-ring seal for cuts or tears.
(3) Position sensor into manifold.
(4) Install MAP sensor mounting bolts (screws). Tighten screws to 3 N·m (25 in. lbs.) torque.
(5) Connect electrical connector.
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August 20, Updated: December 17, By: Abraham Torres-ArredondoArticle ID:
The fastest and the most accurate way to test the manifold absolute pressure (MAP) sensor on your L equipped Jeep Cherokee (Grand Cherokee, Wrangler) is to bench-test it with a multimeter.
In this tutorial I'll show you how in a step-by-step way so that you can find out if the MAP sensor is bad (or not).
This tutorial will also help you diagnose codes: P, P, and P
You can find this tutorial in Spanish here: Cómo Verificar el Sensor MAP ( L Jeep) (at: autotecnico-online.com).
NOTE: For the tutorial covering the MAP sensor test for the - L equipped Jeeps, go here: How To Test The MAP Sensor (Jeep L).
MAP Sensor Diagnostic Essentials
What are the symptoms of a bad MAP sensor? The most obvious symptom that you'll see/experience, when the MAP sensor fails on your L Jeep Grand Cherokee (Cherokee, Wrangler) is the check engine light (CEL) lit on your instrument cluster and one or several of the following MAP sensor trouble codes:
- P: Manifold Absolute Pressure (MAP) System Performance.
- P: Manifold Absolute Pressure (MAP) Circuit Low Voltage.
- P: Manifold Absolute Pressure (MAP) Circuit High Voltage.
You'll also see one or more of the following:
- Bad gas mileage.
- Won't pass the emissions test.
- Black smoke coming out the tail pipe when the engine in your L Jeep Grand Cherokee (Cherokee, Wrangler) is running.
What tools do I need? The most important tool that you'll need is a multimeter.
Here's a list of the tools you'll need:
- A vacuum pump.
- The vacuum pump is not an absolute must, since you can use the good ol' lungs to apply vacuum to the sensor in TEST 1 of this tutorial.
- If you don't have one and/or need to buy one, this is the one that I recommend and you can buy it here: MV Automotive Tune-up and Brake Bleeding Kit.
- Wire piercing probe.
- Although this tool is not an absolute must, if you do buy one, you'll realize just how easy it makes testing the voltages inside the wires.
- If you need to see what this tool looks like, you can see it here: Wire Piercing Probe.
- Scan tool.
- You don't need one to use the info in this article but how else are you gonna' check for the MAP sensor codes?
- Don't have one? Check out my recommendation: Abe's Scan Tool Recommendation.
What does the MAP sensor do? The MAP sensor's job is to measure the pressure inside the intake manifold as the engine in your Jeep runs. Another name for this pressure is vacuum.
Your L Jeep Grand Cherokee's fuel injection computer will use the MAP sensor input, along with the inputs of the crank sensor and throttle position sensor (TPS) to calculate fuel injection and ignition timing (among several things).
The MAP sensor needs 3 inputs to be able to measure the amount of vacuum inside the intake manifold:
- 5 Volts (power).
The descriptions below are of the MAP sensor.
|MAP Sensor Pin Out|
|2||MAP Sensor Signal|
|3||5 Volt Reference|
Where To Buy The MAP Sensor And Save
Diagnosing The Jeep L MAP Sensor
Testing the MAP sensor on your L equipped Jeep Grand Cherokee (Cherokee, Wrangler) involves 3 specific tests, these are:
- The first test is to see if the MAP sensor is creating a signal as you manually apply vacuum with a vacuum pump (or the good ol' lungs).
- Go to: TEST 1: Checking The MAP Sensor Signal.
- The second test is to make sure that the MAP sensor is getting fed power (5 Volts) on the .
- Go to: TEST 2: Checking The 5 Volt Reference Circuit.
- The third test and last test involves checking that the MAP sensor is getting Ground.
- Go to: TEST 3: Verifying The MAP Sensor Is Getting Ground.
When Vera was 12 years old, an unpleasant incident happened to her. She was at home alone. She was lying on the bed and her hands reached by themselves to the place about which her mother spoke so condemningly.
Map jeep sensor location tj
19. 40 Anna No 19. 40 Olga means you wait 19. 41 Anna Hahahaha.Jeep Wrangler TJ (1997 model) 2.5L Manifold Air Pressure Sensor (MAP Sensor) Wiring Repair
Okay, let's figure it out, I don't think it will come to that, because I'm a more or less sane person from this whole company. Or maybe not send. Maybe it's better to wean him from this.
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