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TESTING

Fig. 1: On plate or cone type airflow meters, verify that the plate or cone moves freely

Fig. 2: Airflow meter electrical connections for the plate type sensors

Fig. 3: Airflow meter electrical connections for the cone type sensors

MX-3 (except 1.6L DOHC and 1.8L V6 Engine), 1990–94 323 and Protege
  1. Disconnect the negative battery cable.
  2. Remove the airflow meter assembly.
  3. Inspect the meter body for cracks and for smooth operation of the measuring plate.
  4. Using a suitable ohmmeter, check the resistance between the terminals of the airflow meter plate.
  5. When measuring the resistance between terminals E1 and FC (fuel pump switch), the reading should be infinity with the plate fully closed and 0 ohms when fully opened.
  6. When measuring the resistance between terminals E2 and VS, the reading should be 200–600 ohms with the measuring plate fully closed and 20–1000 ohms when fully opened.
  7. When measuring the resistance between terminals E2 and VC, the reading should be 200–400 ohms with the metering plate in any position.
  8. When measuring the resistance between terminals E2 and THA (intake air thermosensor), the reading should be 13.6–18.4 kohms at -4°F; 2.21–2.69 kohms at 68°F and 493–667 ohms at 140°F with the metering plate in any position.
  9. If not as specified, the airflow meter must be replaced.
1990–92 626 and MX-6
  1. Disconnect the negative battery cable.
  2. Remove the airflow meter assembly.
  3. Inspect the meter body for cracks and for smooth operation of the measuring plate.
  4. Using an ohmmeter, check the resistance between the terminals of the airflow meter plate.
  5. When measuring the resistance between terminals E1 and FC (fuel pump switch), the reading should be infinity with the plate fully closed and 0 ohms when fully opened.
  6. When measuring the resistance between terminals E2 and VS, the reading should be 200–400 ohms with the measuring plate fully closed and 20–1000 ohms when fully opened.
  7. When measuring the resistance between terminals E2 and VC, the reading should be 100–400 ohms with the metering plate in any position.
  8. When measuring the resistance between terminals E2and VB, the reading should be 200–400 ohms with the metering plate in any position.
  9. When measuring the resistance between terminals E2and THA (intake air thermosensor), the reading should be 13.6–18.4 kohms at -4°F; 2.21–2.69 kohms at 68°F and 493–667 ohms at 140°F with the metering plate in any position.
  10. If not as specified, the airflow meter must be replaced.
1994–95 MX-3 with 1.6L DOHC Engine, 1995–98 Protege
  1. Disconnect the negative battery cable.
  2. Remove the airflow meter assembly.
  3. Inspect the meter body for cracks or damage.
  4. Using an ohmmeter, measure the resistance between terminals C and D on the sensor.
  5. The reading should be 2.21–2.69 kohms at 68°F (20°C).
  6. If not as specified, replace the mass air flow sensor.
MX-3 (1.8L), 1993–98 626/MX-6/Probe (2.5L) with V6 Engines
  1. Disconnect the negative battery cable.
  2. Remove the airflow meter assembly.
  3. Inspect the meter body for cracks and for smooth operation of the measuring cone.
  4. Using an ohmmeter, check the resistance between the terminals of the airflow meter cone.
  5. When measuring the resistance between terminals E2 and VS, the reading should be 200–1000 ohms with the measuring cone fully closed and 20–800 ohms when fully opened.
  6. When measuring the resistance between terminals E2 and VC, the reading should be 200–400 ohms with the metering cone in any position.
  7. When measuring the resistance between terminals E2 and THA (intake air thermosensor), the reading should be 2000–3000 ohms at 68°F (20°C) and 400–700 ohms at 140°F (60°C) with the metering cone in any position.
  8. If not as specified, the airflow meter must be replaced.
626/MX-6/Probe with 2.0L Engine and Millenia
  1. Back probe terminal B (center wire) of the air flow sensor electrical connector using a high impedance volt meter.
  2. Connect the other termianl of the meter to ground.
  3. Turn the ignition switch to the ON position.
  4. The meter should read 1.0–1.5 volts.
  5. Start the engine and allow to idle.
  6. The volt meter should read 1.5–2.5 volts.
  7. If the readings are not as specified, replace the sensor.

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