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



Intake Air Housing

Intake Air Sensor And Air Cleaner Housing:





Intake air sensor, checking

- Pull off hose and electrical connector from intake air sensor





- Connect US 1119 multimeter to following terminals of potentiometer (arrows)
3 and 4 or 6 and 9 = 500 to 1000 ohms
2 and 3 or 7 and 9 when moving sensor plate = resistance varies smoothly


Note: If specifications are not reached, replace intake air sensor and readjust idle speed/CO value