VR30DDTT engine

1. Turn ignition switch OFF.
2. Start engine and warm it up to normal operating temperature.
3. Turn ignition switch OFF, wait at least 5 seconds and then turn ON.
4. Check the voltage between ECM harness connector terminals as follows.

   ECM
   Connector	+	-
   	Terminal
   F143	45	78

   NOTE:

   • To avoid the influence of intake manifold vacuum, check the voltage 1 or more minutes past after engine is stopped.
   • Because the sensor is absolute pressure sensor, output value may differ depending on atmospheric pressure and altitude.
5. Measure the atmospheric pressure.
   NOTE: As the atmospheric pressure described on the synoptic chart is the value at sea level, compensate the pressure with the following chart.

   Altitude (m)	Compensated pressure (hPa)
   0	0
   200	-24
   400	-47
   600	-70
   800	-92
   1000	-114
   1500	-168
   2000	-218

6. Check the manifold absolute pressure sensor value corresponding to the atmospheric pressure.

   Atmospheric pressure (hPa)	Voltage (V)
   800	1.4 - 1.9
   850	1.5 - 2.0
   900	1.6 - 2.1
   950	1.7 - 2.2
   1000	1.75 - 2.3
   1050	1.8 - 2.4

Is the inspection result normal?

YES

GO TO 2.

NO

Replace MAP sensor.

1. Start engine and let it idle.
2. Check intake manifold vacuum.
3. Check the voltage between ECM harness connector terminals as follows.

   ECM
   Connector	+	-
   	Terminal
   F143	45	78

4. Confirm the difference of the voltage when engine is stopped and at idling is within the values shown in the following chart.

   Intake manifold vacuum [kPa (mmHg)]	Voltage difference (V)
   -40 (-300)	0.8 - 1.3
   -53.3 (-400)	1.0 - 1.5
   -66.7 (-500)	1.2 - 1.7
   -80 (-600)	1.4 - 1.9

Is the inspection result normal?

YES

INSPECTION END

NO

Replace MAP sensor. Refer to INTAKE MANIFOLD COLLECTOR : Exploded View .