Operation CHARM: Car repair manuals for everyone.
Manuals through 2025 now available!

Our trusted friends have launched a new website named LEMON, which has newer manuals. It also contains all the CHARM manuals.

LEMON is the spiritual successor to CHARM, I recommend you try it!

Link: lemon-manuals.la or lemon-manuals.org.ua

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Air Flow Meter/Sensor: Testing and Inspection

1. Remove the air flow meter from the vehicle.
2. Inspect the air flow meter body for cracks.

Air Flow Meter Test -- Open Position:




Air FLow Meter Schematic:





3. Check the resistance between terminals of the air flow meter and compare the readings with the chart below.

Air Flow Meter Resistance Chart:





4. Press open the measuring plate with a screwdriver, and measure the resistance between E1 and Fc (fuel pump switch) and between E2 and Vs and compare the readings with the chart below.

Resistance Chart:





5. Replace the air flow meter if necessary.