1988 Mazda 323 Air Flow Meter/Sensor Testing and Inspection

1988 Mazda 323 Air Flow Meter/Sensor Testing and Inspection

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1. Check air flow meter body for cracks or damage. Replace if necessary. 2. Measure resistance of air flow meter terminals, Fig. 25, as follows: a. Connect suitable ohmmeter,Fig. 4, between terminals E2 and VS Resistance should be 20-400 ohms. b. Connect ohmmeter between terminals E2 and VC. Measured resistance should be 100-300 ohms. c. Connect ohmmeter between terminals E2 and VB. Resistance values should be 200-400 ohms. d. Connect ohmmeter between terminals E2 and THA (intake air temperature sensor). At ambient temperatures of (-)4° resistance va lues should be F, 10,000-20,000 ohms. At temperatures of 32° resist ance should be 4,000- F, 7,000 ohms. At temperatures of 68° resistance sho uld be 2,000-3,000 F, ohms.

At temperatures of 104° resistance should b e 900-1,300 ohms. At F, temperatures of 140° resistance should be 400-700 ohms. F, e. Connect ohmmeter between terminals E1 and FC. Ohmmeter should read infinity. 3. Check operation of measuring plate, Fig. 3 as follows: a. With measuring plate closed, check resistance between terminals E1 and FC (fuel pump switch). Ohmmeter should read infinity. Fully open plate with a screwdriver, then observe ohmmeter. Resistance should be 0 ohms. b. With measuring plate closed, check resistance between terminals E2 and VS. Resistance should be 20-400 ohms. Fully open plate as described above and observe ohmmeter. Resistance should be 20- 1,000 ohms.