MAP Sensor Testing Using a Multimeter

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A MAP sensor measures the amount of air pressure in proportion to the vacuum inside the intake manifold. The pressure is then converted into a voltage signal, which the sensor sends to the car’s computer.

MATERIALS:

• multimeter
• pins
• alligator clips

PROCEDURES:

• insert the pins into the socket
• connect the black wire to the ground of the car
• search for the ground wire
  • the car must not be turned on
  • set the multimeter to ohms continuity mode
  • connect the red wire to the pins one by one until it beeps
  • take note of the wire that beeps
• search for the power wire
  • turn the ignition on
  • set the multimeter to voltage mode higher than 5 volts
  • connect the red wire to one of the pins
  • when the voltage reading is 5 volts, then it is the power wire
  • take note of the power wire
• the remaining wire is the signal wire
• start the car
• the reading of the power wire is still at 5 volts
• the signal wire should read 1 to 2 volts at the car’s idle
• when the throttle is open, the voltage usually increases, otherwise, the MAP sensor is malfunctioning
• done