P0106 Honda 1.6L – Test a Civic MAP Sensor
OBDII P0106 Honda trouble code is a troublesome one, and has to do with your Honda Manifold Absolute Pressure Sensor or MAP. This check engine trouble code is known as P0106 and the specific Honda language around this code is for Manifold Absolute Pressure Performance. This means that either your MAP sensor is failing or there’s some sort of vacuum leak from where the MAP sensor mounts to your intake system.
Today I’ll be showing you how to repair your OBDII trouble code by testing your MAP sensor and eliminating your P0106 Honda trouble code using a scan tool in a 1996 Honda Civic EX. The Manifold Absolute Pressure sensor is responsible for informing your Honda ECU of how much air is entering your 1.6 liter SOHC engine. When you have a problem with your MAP sensor, your Honda ECU will be operating in the blind and your Civic will drive poorly and respond slowly to your throttle inputs.
The Civic MAP sensor in your vehicle is a three pin unit that’s comprised of a power signal wire, ground signal wire and the MAP voltage wire which is transmitted back to your ECU. Using this data, the Honda ECU in your Civic can control your engine’s fuel and spark delivery to properly operate your engine.
Possible causes of P0106 Honda trouble code
- Short or damaged MAP signal wiring
- Faulty or bad MAP sensor
- Leaking MAP seal
Test a Civic MAP sensor at your ECU
This procedure is so easy, you don’t even have to open your hood to test your MAP sensor! To test your MAP sensor through your Honda ECU, you must open your passenger side door and remove the passenger side kick panel to expose the ECU. There are three 10mm nuts that hold your ECU to the bracket mounted in the passenger side footwell, remove these to liberate your Honda Civic ECU.
The plug we are looking for is the last one on the right in the image above, which is a 16 pin Civic ECU connector. Using a multimeter, you can easily and quickly test your MAP sensor without having to wait for your 1.6 liter engine to cool down.
Unplug the 16 pin terminal on your Honda Civic ECU, and locate PIN 3 which is a RED / GREEN wire. This wire signifies the central signal wire on your manifold absolute pressure sensor. Carefully backpin this wire so that you can read the values being sent to your ECU real time.
Using your multimeter ground the black lead or probe on a chassis ground, do not use any grounds that exist on the ECU. Now gently measure the backpinned terminal of PIN 3 on the 16 pin ECU harness you removed. Insert your key into the ignition of your Honda Civic, and turn the key to the “ON” position but do not start your Civic engine.
The factory Honda Civic MAP sensor has a limitation of 11 psi of positive pressure, and at this current state with your engine off but the key turned to the ON position your MAP sensor should report a voltage of 2.9 volts (± 1 V). Keep your multimeter probe connected, and make sure that you are not shoving the probe into the ECU housing as this may damage your ECU or the harness permanently.
Start your Honda Civic engine and depress the gas pedal to rev the engine and increase engine speed. As your engine speed increases and positive airflow enters your intake manifold, the vacuum read by your MAP sensor will decrease. When the MAP sensor reads vacuum your voltage will increase towards the 2.9 volts you originally saw. More pressure means less voltage, less pressure and more vacuum means higher voltage.
If your MAP sensor does not respond or rise and fall accordingly, chances are your MAP sensor is bad and must be replaced. If you want to test your Honda Civic MAP sensor by opening the hood and testing the sensor itself, refer to our guide here on OBDII DTC P1129 here.
Replacing your Honda Civic MAP sensor is easy and very straightforward, the part number for this unit is Have any questions