Check engine lights are rarely a fun time, and the Honda OBDII DTC P0107 is no different. When your Honda Accord’s check engine light is on for this code, it usually means there’s a problem with your MAP Sensor. The good news is that it’s not too difficult to fix this problem, although depending on your year it can be more or less difficult.
Your Honda Accord Manifold Absolute Pressure (MAP) Sensor monitors the intake manifold for a real time reading of the pressure entering your engine. As your 2.2 or 2.3L F series engine climbs in engine speed and load, the MAP sensor is responsible for being your Honda ECU’s “eyes” when it comes to air intake.
Based on this value, your ECU will increase injector pulsewidth (more fuel) or decrease injector pulsewidth (less fuel) to make sure that the F22 or F23 is running optimally. The specific name of this code is Manifold Absolute Pressure (MAP) Circuit Low Voltage, which means your ECU is receiving too low of a value to orchestrate the fuel and spark events. Either your MAP sensor has failed or there’s a wiring issue preventing your MAP sensor from working correctly.
Today I’ll be showing you how to measure a Honda Accord MAP signal in a 1999 Honda Accord EX with the F23 engine in it. This 2.3 liter VTEC engine is pushed further back than earlier models of the Accord, but it’s still plenty easier than testing your TPS.
You may have other OBDII check engine codes stored in your Honda Accord ECU, and this how to measure a Honda Accord MAP signal guide can also be applied for (MAP) Sensor signal being higher than expected.
Where is my Honda Accord MAP Sensor?
The easiest part of our how to measure a Honda Accord MAP signal guide, your MAP sensor is mounted to the top of your Honda Accord throttle body. Open your hood and follow your intake piping back to your throttle body, the MAP sensor is a three pin unit that’s mounted to the top and secured by two screws.
The part number for your Honda Accord Manifold Absolute Pressure (MAP) sensor is 37830-P0G-S00, the following are some interchange numbers in case your local Honda doesn’t have your part.
How do I measure the signal?
You will need to use a multimeter to measure the voltage from your MAP sensor. If you are not sure what a multimeter or voltmeter is, check our handy guide here.
Which wire is the SIGNAL wire on my Honda Accord MAP Sensor?
The wire on the right hand side of the MAP connector when facing the back of the plug is your signal wire. This is a RED colored wire, and it transmits the pressure and vacuum signals to your ECU.
To test this wire correctly, you will need to back pin this terminal and test it with your MAP sensor connected. You do this by taking a paper clip and bending it into an L shape. Insert one end into the red wire or the right hand terminal, and leave the other end sticking up. You will be measuring the voltage being sent by your MAP sensor using your multimeter.
Start your vehicle and connect the black lead of your voltmeter to the negative on your battery. Next probe the backpinned signal wire of your Honda Accord MAP sensor to determine the voltage.
You should see between .2 and .6 volts being sent from your MAP sensor at idle. Raise the engine speed by having a friend step on the gas gently, or simply deflect or open your throttle body yourself.
Voltage should rise steadily and show no signs of gaps or spikes. Your MAP sensor signal voltage should steadily sweep upwards and show no signs of abnormalities. If your Honda Accord MAP sensor is acting up or not showing these values, take your phillips screwdriver and undo the two screws that hold your MAP sensor in place.
If your MAP sensor is bad, you must replace it in order for your P0107 check engine light to be resolved. Did our How To Measure a Honda Accord MAP Signal DIY Guide help you in taking care of your check engine light? Did you maybe need our guide on your MAP signal being too high? If so check our How To Service your Honda Accord MAP Sensor here.