Using a 3 bar MAP sensor
The standard Honda MAP sensor can read boost up to 11 lbs. By using a 3
bar MAP sensor boost up to 28 lbs can be read. The same fuel and ignition
tables are used for both MAP sensor to swapping between the sensors is
only a matter of wiring the sensor in and using ROM Editor to change the
MAP sensor type.
The 3 Bar MAP sensor
The connectors are stamped A, B & C on the sensor.
In this case an exact fit plug was not available so a GM AC
Pressure switch plug was used (Conduct Tite part number 85146 from
Pep Boys, about $10). We cut a small slot down the side of the
connector to make it fit the MAP sensor.
Hondata now supplies the correct connectors with the MAP
|Splice to existing wiring
Splice the three wires into the existing wiring loom so that
you can swap between the MAP sensors if necessary, or revert back
to the stock MAP sensor. Make sure that only one MAP sensor
is connector at a time. These colors are for early model Hondas
For verification check inside the Honda Map sensor plug. The pins may be labeled with V O G - for Voltage, signal and ground.
Check the wire voltages with a multi-meter to make sure the wiring has been performed correctly. Especially that there is 5 Volts between connector A and C. With the ignition switch on but the engine not running the standard MAP sensor should read 2.85V between the MAP signal and GND wires. The 3 Bar MAP sensor should read 1.6V.