Testing MAP sensor

[DannyW]

I'm still getting the engine check light coming on above 3000rpm along with code 31 on my N/A supra which points towards a faulty MAP sensor.

 

Is there a way to test the sensor? i have a multimeter i can use if that helps.

 

 

thanks.

[DannyW]

Anyone?

[Lucifer]

Yes I have that information somewhere ill dig it out.

[SimonB]

In the tech manual, it says:

 

Test the supply voltage to the sensor, unplug it and there should be 4.5-5.5v between terminals VCC and E2 of the plug going to it (that's the outer two pins) with the ignition on.

 

The test for the sensor itself I don't think is going to be very useful, because you have to disconnect the hose on the intake chamber side and apply a vacuum to it. You will have to measure the voltage at the ECU or by sticking pins into the cables going to the sensor. At normal atmospheric pressure it is supposed to be 3.3-3.9V. The voltage drop from normal atmospheric pressure when you apply a vacuum is supposed to be:

 

13.3 kPa 0.3-0.5 V

26.7 kPa 0.7-0.9 V

40 kPa 1.1-1.3 V

53.5 kPa 1.5-1.7 V

66.7 kPa 1.9-2.1 V

[DannyW]

Thanks for that Simon, i'll test the supply voltage and if that's ok then i'll look around for a replacement sensor.

[imi]

In the tech manual, it says:

 

Test the supply voltage to the sensor, unplug it and there should be 4.5-5.5v between terminals VCC and E2 of the plug going to it (that's the outer two pins) with the ignition on.

 

The test for the sensor itself I don't think is going to be very useful, because you have to disconnect the hose on the intake chamber side and apply a vacuum to it. You will have to measure the voltage at the ECU or by sticking pins into the cables going to the sensor. At normal atmospheric pressure it is supposed to be 3.3-3.9V. The voltage drop from normal atmospheric pressure when you apply a vacuum is supposed to be:

 

13.3 kPa 0.3-0.5 V

26.7 kPa 0.7-0.9 V

40 kPa 1.1-1.3 V

53.5 kPa 1.5-1.7 V

66.7 kPa 1.9-2.1 V

 

are these the same specs for the Supra TT as well?