P0100moderate severityPowertrain
Mass Air Flow (MAF) Circuit
on 1997 Toyota 4Runner 3.4L V6 · RWD
What this code means
The PCM detected a general malfunction in the Mass Air Flow sensor circuit.
Symptoms
- Check Engine Light
- Poor acceleration
- Rough idle
- Engine stalling
- Black smoke
Common causes
- Faulty MAF sensor
- Dirty MAF sensor element
- Air leak after MAF
- Wiring issue
- Damaged air filter
Diagnostic steps
- Inspect MAF sensor for contamination
- Check for air leaks between MAF and throttle body
- Test MAF signal with scan tool
- Inspect wiring and connector
- Try cleaning MAF with approved cleaner
Repair notes
Clean MAF sensor with electronics cleaner. Replace if cleaning does not resolve.
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