MAP Sensors

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Finding info on MAP sensors is fairly onerous, so this page gives some detail on the various Denso manifold absolute pressure sensor/transducers and some other makes.

Make sure you check for content accuracy, given variances do occur as vehicles go through model changes.

G102 (HC=E) MAP

This unit outputs between 3 and 3.9 VDC with the engine off depending on the elevation (the higher the elevation the lower the atmospeheric pressure and thus lower the output signal). It is a typical MAP transducer in that it has a nominal 5VDC supply and is direct acting . At 7.874"Hg (200mmHG) vacuum on the gauge (which is equal to 22" Hg = 560mm Hg = 10.8 psi absolute pressure) the output should be around 0.65 to 0.95 VDC.

On the standard ECU the Pin12 (black wire) is the 5VDC supply, Pin 22 (white wire) is common ground and Pin 13 (red wire) is the MAP signal.

GTti MAP

This is a 2 bar sensor, i.e. it ranges over two atmospheres.

On the standard ECU the Pin25 (white/black wire) is the 5VDC supply, Pin 31 (yellow/blue) is common ground and Pin 9 (yellow/red wire) is the MAP signal.

G202 (HE-E) MAP

G203/F300/Applause (HD-E) MAP

This basically the same 1 bar MAP sensor used on the G102 models. It outputs between 3 and 3.9 VDC with the engine off depending on the elevation (the higher the elevation the lower the atmospheric pressure and thus lower the output signal). At 7.874"Hg (200mmHG) vacuum on the gauge (which is equal to 22" Hg = 560mm Hg = 10.8 psi absolute pressure) the output should be around 0.65 to 0.95 VDC.

The map sensor for this model is connected to the ECU via a screened mulicore cable. The terminal identifiers both ends of the cable are: Vcc (ECU pin 12) for 5 VDC supply, PiM(ECU pin 13) for the signal and E21 (ECU pin 22) for the common ground.

Delco MAP

These come in three ranges. The unit with a green plug is 1bar (14.5 PSIA, 100kPaA) range. The 2 and 3 bar units have black plugs

They are direct acting, for example the DC voltage output is approaching 5 VDC when the absolute pressure is 1 bar and near 0VDC at maximum manifold vacuum.

Ford MAP

The Ford MAP/BP outputs a direct acting frequency instead of a voltage. Its range is 92 to 162 Hertz (Hz) over 1 bar. So when testing use a multimeter with a Hz function. The supply voltage is 5 VDC.

Toyota

The Toyota Camry cum Holden Apollo used a Denso MAP model 89420-35010 and might be worth considering as a replacement if the standard 1 bar sensor is unavailable

Motorola

Motorola make some fairly cost effective MAP sensors.

Above is the MPX4105A	This unit is used on the MegaSquirt Fuel Controller