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Manifold Absolute Pressure (Map) Sensor

WARNING: This page is about a different car, the 1997 Mazda Millenia. However, it is still accessible from the selected car via links, so may be relevant.
  1. MAP sensor is located in right rear of engine compartment. Connect Engine Signal Monitor (49 9200 162A) to ECM, using proper overlay and adapter cables. Turn ignition on. Measure voltage at ECM terminal 3U.
  2. With 14.5 psi (100 kPa) of pressure applied to sensor, voltage should be 4-5 volts. With 0 psi (0 kPa) of pressure applied to sensor, voltage should be 2.4-2.9 volts. With 25.6 in. Hg of vacuum applied to sensor, voltage should be .9-1.1 volt. If all voltage readings are as specified, fuel MAP sensor is functioning properly. If any voltage specification is not as specified, go to next step.
  3. Turn ignition off. Check continuity of circuits between MAP sensor wiring harness connector and ECM. See appropriate wiring diagram in WIRING DIAGRAMS - 2.3L article. If continuity exists in all circuits, go to next step. If continuity does not exist in one or more circuits, repair wiring harness as necessary.
  4. Turn ignition on. Measure voltage at terminal "A" at MAP sensor wiring harness connector. See Figure . Voltage should be less than one volt. Measure voltage at terminal "B" at MAP sensor wiring harness connector. Voltage should be 4.5-5.5 volts. If voltage is as specified, replace MAP sensor. If voltage is not as specified, locate and repair short circuit in wiring harness. See appropriate wiring diagram in WIRING DIAGRAMS - 2.3L article.
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