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)

Or, hide this message: temporarily or permanently

Checking Mass Air Flow (MAF) Sensor Signal





Checking Mass Air Flow Sensor Signal
- Ignition on.
- Select scrolling values.
- Operate starter motor.
- Read off the mass air flow (MAF) value.
- Mass air flow should be approx. 12 kg/h at 200 rpm.

If reading is OK:
^ Proceed to: Checking Engine Coolant Temperature (ECT) Sensor Signal section.

If reading is incorrect:
^ Fault-trace mass air flow sensor.