how do i test a map sensor on a 1992 honda civic the harness that connect to the map sensor have 3 wire yellow with green strip and a white and a green where do i put the + wire and the - wire of the mult meter to check it

CaptainRich

The Manifold Absolute Pressure Sensor converts a pressure differential to a voltage signal which is then sent to the ECU as an input. At idle with a manifold pressure of 500 mmHg (20 in.Hg) the sensor output is approx. 1.0 - 1.25 volts, at wide open throttle manifold pressure of 0 mmHg (0 in.Hg) the output is approx. 2.75 - 3.0 volts. If your DVOM has a min/max setting, use that because finite readings are difficult to duplicate. If you find it is out of range, or if it has become contaminated (i.e.: water etc) simply replace it. Are you having any drivability symptoms or any diagnostic codes stored (Check Engine light on)?



Measure from White to Green/White. Yel/Red is reference and should remain static.

shawn0634

the car is not driving all it doing is cranking so i want to check this sensor i was told to use a mult meter to check so all i want to know is which wire should i put the + and the - on the mult meter this is the wire that are on the map sensor green with yellow stripe white and green

CaptainRich

Without the engine running, you'll need a hand-held vacuum pump to check the functionality of the sensor. You can however make certain the sensor is getting the necessary reference voltage. Check that and tell us what you get.

You don't say if the ignition system is generating spark...? Do you know if the engine is getting fuel?

shawn0634

this is what i am asking which wire on the map sensor is the + so i can test it does anyone know i have a green wire with yellow stripe and a white wire and a green wire which one is the + wire there do you know