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



Note: Pin numbering show in brackets ( ) are for early Air Flow Sensors.

Air flow sensor resistance:
Pins 3 and 4 (9 and 6) 500-1000 Ohms
Pins 2 and 3 (7 and 9) resistance should vary as sensor flap is moved

Intake Air Temperature sensor, Pins 1 and 4 (22 and 6):
32°F (0°C) 5,000-6,500 Ohms
68°F (20°C) 2,000-3,000 Ohms
104°F (40°C) 1,000-1,500 Ohms
140°F (60°C) 500-675 Ohms
176°F (80°C) 275-375 Ohms
212°F (100°C) 150-250 Ohms