Code P1400 Manifold Differential Pressure Sensor

KIWASABI1

MEMBER
2001 MITSUBISHI ECLIPSE
2.4L
4 CYL
2WD
AUTOMATIC
230,000 MILES

I just got the P1400 code today. This is a manufacturer specific code and from digging around it's for the Manifold Differential Pressure sensor. Is this the same thing as the Manifold Absolute Pressure sensor? How could I test this with my ELM327 Bluetooth OBD2 scan tool? From reading online it can be the sensor itself, EGR valve related, or an MDP circuitry short. I can't find much info about potential symptoms caused by this issue.

Monday, May 16th, 2022 AT 6:08 PM

4 Replies

SQM

MECHANIC
6,383 POSTS

Hello,

Yes, the manifold differential pressure and manifold absolute pressure is the same component for this vehicle.
As you know there are a number of reasons why this code will get triggered. The best course of action would be to take a look at different possibilities.
I have attached the troubleshooting steps for the code P1400 below.
Follow those steps as it can help you determine the issue.

Let me know what you find or if you have any questions.

Thank you.

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Monday, May 16th, 2022 AT 8:24 PM

JACOBANDNICKOLAS

MECHANIC
110,114 POSTS

Hi,

They are two different things. The MAP sensor provides a reading based on 0 pressure. On the other hand, the differential pressure sensor measures pressures at two different points in a system.

A differential pressure sensor is commonly used on a turbocharged engine. In this case, it isn't.

If you look below, I provided the directions/diagnostics for the code you have. Take a look through it and let me know if it helps or if you have questions.

Let me know.

Joe

See pics below.

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Monday, May 16th, 2022 AT 8:43 PM

KIWASABI1

MEMBER
198 POSTS

My apologies for the slow reply to this. This turned out to simply be a broken clip on the connector for the MDP sensor. So this was simply a hacky fix using a few zip ties to lock the MDP sensor in place. I've had to do this with several sensors at this point as the plastic in the connectors has gotten stiff and brittle and has broken in many cases. Thanks for all the helpful information on MDP sensor diagnosis.

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Wednesday, August 23rd, 2023 AT 12:55 PM

JACOBANDNICKOLAS

MECHANIC
110,114 POSTS

Hi,

Thank you for the update. First, I'm glad to know you found the problem and were able to resolve the issue. Also, I'm happy to hear it was an easy fix.

Regardless, take care of yourself, and feel free to come back anytime in the future. You are always welcome.

Joe

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Wednesday, August 23rd, 2023 AT 7:47 PM