Genuine Nissan Quest MAP Sensor

Nissan Quest MAP Sensor Parts Questions & Experts Answers

• Sensor-Boost
  22365-6B700
  Q: What is the function and testing procedure of the Manifold Absolute Pressure (MAP) sensor and its solenoid valve on Nissan Quest?

  A: MAP sensor is utilized with MAP sensor solenoid valve, which is used for intake manifold pressure, and ambient barometric pressure change circuits based on the variations in the engine load and speed. The PCM uses the signal from the MAP sensor to control the Evaporative emissions, where by applying voltage to the solenoid valve it changes the vacuum signal for measuring the ambient pressure and where removing voltage enables measurement of intake manifold pressure. The vacuum signal is converted into voltage by the MAP sensor and the voltage ranges between 0.5v which is the closed throttle voltage to about 5.0v which is the wide open throttle voltage though the voltage varies slightly with changes in altitude. Each is installed on the cowl in the engine compartment and the EEC will sense numerous problems with the MAP sensor setting codes for certain problems. To check the reference voltage from the PCM to the MAP, remove the MAP harness connector and place meter probes on the REF terminal you should a battery voltage with the ignition key ON about 5.0 volts. In case of no reference voltage it shows short or open circuit to the PCM or defective PCM may be there. Next, without starting the engine:-Unplug the vacuum from the sensor-If you've collected the MAP sensor-connector, read the voltage on SIG terminal, it should be 3.2 to 4.8 volts. After reconnecting the vacuum hose, s to the engine and examine the voltage on the signal wire which should increase with the increase in RPMs and decrease to below 2.0 volts at idle. If signal voltage remains the same, look for vacuum from solenoid valve; if vacuum is present after 5 sec of engine start and MAP sensor receives REF signal, replace MAP sensor. If vacuum is not present examine the condition of the hoses, if the hoses seem to be in good condition then measure battery voltage at the solenoid valve with ignition on. If voltage is absent, check the wiring harness; if present, change solenoid valve, and recheck. For replacement, the negative battery terminal must be removed and the electrical connector which is attached to the MAP sensor or solenoid valve severed from the main body, the retaining nut/bolt must also be loosened before the couplings are removed. Installation, on the other hand, begins at the bottom of the utility pathway and goes in the opposite order of the removal procedure.