4.4 Other sensors 4 WIRING
Pin Function Connection
A Switched 12 volts 12 volt fused supply from main relay
B Ground To engine block
C MAF signal ground MS3Pro sensor return
D MAF output signal MS3Pro analog input
4.4.4.2 Ford 5 pin rectangular connector MAF The rectangular connector MAF sensor has 5 pins denoted
by A, C, D, and E, with the B pin missing:
Pin Function Connection
A Switched 12 volts 12 volt fused supply from main relay
C Ground To engine block
D MAF signal ground MS3Pro sensor return
E MAF output signal MS3Pro analog input
4.4.4.3 Nissan / Infiniti Q45 MAF This is a popular MAF with many Japanese imports, although its huge
diameter (90 mm) and ability to handle large air flow volumes (by OEM MAF standards) would work well on many
smallblock domestic V8s as well. Note that the picture below uses non-stock wire colors for clarity.
Pin Function OEM wire color Connection
B MAF output signal White MS3Pro analog input
D Ground Black MS3Pro sensor return
E Switched 12 volts Black / white 12 volt fused supply from main relay
4.4.5 Oxygen sensors
The MS3Pro can accept input from a narrow band O
2
sensor directly; simply wire the narrow band sensor signal
to the O2 input wire on the MS3Pro. Narrow band O
2
sensors may have from one to four wires. Here is what to do
with the wires depending on the type.
• Single wire: The wire is the sensor signal and it grounds through the body.
• Two wires: One wire is the signal and the other connects to the sensor ground.
• Three wires: This is a heated sensor. In addition to the signal wire, there is a heater wire that connects to
a switched 12 volt source, and a ground wire which should be connected to the engine block as the heater
draws more current than we recommend applying to the sensor ground wire.
AMP EFI MS3Pro manual version 1.202, firmware 1.5.0, 4/21/2017 Page 40
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