Question about 2005 Mercury Grand Marquis
Means your egr is malfuctioning or needs to be cleaned. the high imput means the egr is allowing for exhast gases into the combustion chamber and the map code is caused by the egr as well.
Posted on Nov 12, 2009
Testimonial: "Certainly sounds simple enough. Thanks for the solution. Doug"
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Posted on Jan 02, 2017
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Fig. Fig. 3: Location of the MAP sensor-TBI system shown
Fig. Fig. 4: Probe the terminals of the MAP sensor to check for proper reference voltage
Fig. Fig. 5: Manifold Absolute Pressure (MAP) sensor wiring diagram
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MAP Sensor TESTING
See Figures 1, 2 and 3
Fig. Fig. 1: Typical Manifold Absolute Pressure (MAP) sensor wiring diagram (wire color, terminal identification/location may vary on certain models)
Fig. Fig. 2: Using jumper wires and a high impedance voltmeter test between MAP sensor terminals A and C with the key ON and engine off. The voltage should be approximately 5 volts
Fig. Fig. 3: Next test between MAP sensor terminals A and B with the key ON and engine off. The voltage should be approximately 0.5 volts
EGR test: requires a GM scan tool:
Linear EGR Valve
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