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Home >> Toyota >> 2017 >> 4Runner TRD Pro >> Repair and Diagnosis >> Engine Performance >> System >> Engine Control System - Diagnostic Codes (P0010-P0128) >> SFI System >> DTC P0101: Mass Air Flow Circuit Range / Performance Problem [08/2015 - ] >> Description
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DTC P0101: Mass Air Flow Circuit Range / Performance Problem [08/2015 - ]: Description

Refer to DTC P0102 (Refer to DESCRIPTION , or refer to DTC P0102: Mass or Volume Air Flow Circuit Low Input; DTC P0103: Mass or Volume Air Flow Circuit High Input [08/2019 - ] ).

DTC No. DTC Detection Condition Trouble Area
P0101 Conditions (a), (b), (c), (d) and (e) continue for more than 10 seconds (2 trip detection logic):
(a) Engine is running.
(b) Engine coolant temperature is 70°C (158°F) or higher.
(c) Throttle position sensor voltage is 0.2 V or higher and less than 2 V.
(d) Average engine load value ratio is less than 0.85, or more than 1.16 (varies with estimated engine load).
Average engine load value ratio = Average engine load based on mass air flow meter output / Average engine load estimated from driving conditions
(e) Average air-fuel ratio is less than -20%, or more than 20%.
  • Mass air flow meter
  • Air induction system
  • PCV hose connections