Question about 1998 Volvo V70
Does anyone have the resistance figures for the various pins at the plug of the older lh2.2 map sensors ? I'vechecked O2 sensor voltage (ok) and the ect' resistance is spec. map sensor is next
thanx one and all.
Did you check all the basics first? Your air filter or catalytic converter could be plugged, your brakes could be dragging, or incorrect ignition timing, dirty fuel injectors, insufficient tire pressure, poor wheel alignment, or you may even have a fuel leak that you are not aware of. Hope this helps.
Posted on Mar 04, 2009
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Posted on Jan 02, 2017
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Jan 28, 2013 | Dodge Durango 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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