Manifold Absolute Pressure Sensor On-Vehicle Inspection

Check the power source voltage.

1. Disconnect the pressure sensor connector.
   

2. Turn the ignition switch ON.
   

3. Measure the voltage between terminals M3-3 (VC (+)) and M3-1 (E2 (-)).
   

   Standard voltage:

   4.75 to 5.25 V
   

   If the result is not as specified, inspect the wire harness or ECM (Toyota Fortuner RM000000VQD004X.html).
   

4. Turn the ignition switch OFF.
   

5. Connect the sensor connector.
   

Check the power supply.

1. Turn the ignition switch ON.
   

2. Disconnect the vacuum hose from the pressure sensor.
   





3. Connect a voltmeter to terminals E22-2 (PIM (+)) and E22-9 (E2 (-)) of the ECM, and measure the output voltage at ambient atmospheric pressure.
   





4. Apply a vacuum to the pressure sensor in 13.3 kPa (100 mmHg, 3.94 in.Hg) increments until the pressure reaches 40.0 kPa (300 mmHg, 11.81 in. Hg).
   

5. Measure the decrease in voltage for each increment.
   

   Standard voltage decrease:

   Applied Vacuum	Specified Condition
   13.3 kPa (100 mmHg, 3.94 in.Hg)	0.3 to 0.5 V
   26.7 kPa (200 mmHg, 7.87 in.Hg)	0.6 to 0.8 V
   40.0 kPa (300 mmHg, 11.81 in.Hg)	0.95 to 1.15 V

   If the result is not as specified, replace the manifold absolute pressure sensor.
   




6. Using SST (turbocharger pressure gauge), apply pressure to the sensor in 19.69 kPa (0.20 kgf/cm², 2.84 psi) increments until the pressure reaches 98.0 kPa (1.0 kgf/cm², 14.2 psi).
   

   SST

   09992-00242
   





7. Measure the increase in voltage for each increment.
   

   Standard voltage increase:

   Applied Pressure	Specified Condition
   19.6 kPa (0.20 kgf/cm2, 2.84 psi)	0.4 to 0.7 V
   39.2 kPa (0.40 kgf/cm2, 5.69 psi)	0.9 to 1.2 V
   58.8 kPa (0.60 kgf/cm2, 8.53 psi)	1.5 to 1.8 V
   78.5 kPa (0.80 kgf/cm2, 11.4 psi)	2.0 to 2.3 V
   98.0 kPa (1.00 kgf/cm2, 14.2 psi)	2.5 to 2.8 V

   If the result is not as specified, replace the manifold absolute pressure sensor.
   

8. Connect the vacuum hose to the sensor.