MX-5 Miata LS L4-1.8L DOHC (2001)
Air Flow Meter/Sensor: Testing and Inspection
MASS AIR FLOW (MAF) SENSOR INSPECTION
NOTE: Perform the following test only when directed.
1. Visually check for the following on the MAF sensor.
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Damage
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Cracks
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Terminal bends
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Terminal rust
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If any of the above are found, replace the MAF sensor.
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If the above are found okay, but PID value is out of specification, perform the "Circuit Open/Short Inspection".
2. Reconnect the MAF sensor connector.
NOTE: The scan tool shows the MAF rate and load value.
Circuit Open/Short inspection
Open circuit
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If there is no continuity, the circuit is open. Repair or replace the harness.
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MAF circuit (MAF sensor connector terminal B and PCM connector terminal 4X.)
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Power circuit (MAF sensor connector terminal C and main relay terminal D through common connector.)
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GND circuit (MAF sensor connector terminal A and PCM connector terminal 4A through common connector.)
Short circuit
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If there is continuity, the circuit is shorted. Repair or replace the harness.
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MAF sensor connector terminal B and PCM connector terminal 4X to GND.
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MAF sensor connector terminal C and main relay terminal D through common connector to GND.