Question about 1999 Nissan Altima
The MAP sensor is located on the driver's side of the engine compartment next to the air filter housing and shock tower.
It is a small plastic component with one vacuum hose coming off of it and an electrical connector that has two wires. . Sometimes just replacing the part is a waste of money. The fact that the code has indicated the problem is the MAP sensor, doesn't mean it is bad. As an example, check to see if the Vacuum hose is secure and not disconnected or split at either end.
Good luck.Here's what it looks like.
Posted on May 07, 2013
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Posted on Jan 02, 2017
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Mar 19, 2016 | Cars & Trucks
Working of Manifold Absolute Pressure (MAP) Sensor...
--------------These will help.Thanks.
Nov 23, 2012 | Cars & Trucks
Fig. Fig. 3: MAP sensor location-3.3L and 3.8L engines
The PCM supplies 5 volts of direct current to the Manifold Absolute Pressure (MAP) sensor. The MAP sensor then converts the intake manifold pressure into voltage. The PCM monitors the MAP sensor output voltage. As vacuum increases, the MAP sensor voltage decreases proportionately. Also, as vacuum decreases, the MAP sensor voltage increases proportionally.
With the ignition key ON , before the engine is started, the PCM determines atmospheric air pressure from the MAP sensor voltage. While the engine operates, the PCM figures out intake manifold pressure from the MAP sensor voltage. Based on the MAP sensor voltage and inputs from other sensors, the PCM adjusts spark advance and the air/fuel ratio. The MAP sensor is mounted to the intake manifold, near the throttle body inlet to the manifold. The sensor connects electrically to the PCM.
Fig. Fig. 4: Disengage the MAP sensor connector-3.0L engine shown
WARNING When testing the MAP sensor, make sure the harness wires do not become damaged by the test meter probes.
Fig. Fig. 7: Using a digital volt-ohmmeter, test the MAP sensor voltage-3.0L engine shown
REMOVAL & INSTALLATION
See Figures 1, 2, 3 and 4
The MAP sensor is mounted on the intake manifold near the throttle body inlet to the manifold.
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