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

(Some people have issue connecting. LEMON is investigating. For now, use Firefox or change your DNS server)

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Air Flow Meter/Sensor: Testing and Inspection


Air Flow Meter Removal:





1. Disconnect the air flow meter connector.
2. Remove the air hose to the air pump.
3. Loosen the air funnel bolt.
4. Remove the air cleaner and the air flow meter.
5. Remove the air flow meter.
6. Inspect the air flow meter body for cracks or damage.
7. Verify that the measuring plate opens smoothly.

Air Flow Meter Schematic:





8. Measure the resistance of the air flow meter using an ohmmeter and compare the readings to the chart below.

Resistance Values: