DTC Description

DTC DETECTION LOGIC

DTC No.	CONSULT screen terms (Trouble diagnosis content)	DTC detecting condition
P0101	MAF SEN/CIRCUIT-B1 (Mass or volume air flow "A" circuit range/performance)	A low frequency from the sensor is sent to ECM under light load driving condition. A high frequency from the sensor is sent to ECM under heavy load driving condition.

POSSIBLE CAUSE

Harness or connectors [The mass air flow sensor (bank 1) circuit is open or shorted.]
Mass air flow sensor (bank 1)
EVAP control system pressure sensor
Intake air leaks
Intake air temperature sensor
Electric throttle control actuator
PCV hose air leak
Purge hose air leak
Throttle deposit

FAIL-SAFE

Fail safe mode	Vehicle behavior
Traveling control mode	ECM controls the accelerator pedal depression speed to make it slower than actual speed. This causes a drop in accelerating performance and encourages the driver to repair malfunction. NOTE: ECM does not control the accelerator pedal releasing speed.
Combustion control mode	No stratified charge combustion at starting (cold start).

Fail safe mode	Vehicle behavior
Engine output control	ECM reduces the engine output, according to the rise in engine speed. This reduces the vehicle speed to encourage the driver to repair malfunction. Driving at 70 km/h (43 MPH) or more is possible. NOTE: This value is a reference value converted from engine power to vehicle speed. Actual power limitation value differs due to the malfunctioning part and driving condition.
Device fix mode	Fixes electric intake valve timing control motor in the reference position. Fixes exhaust valve timing control solenoid valve in the reference position.
Combustion control mode	Partially controls ignition timing control. Controls ignition timing delay control in the intermediate water temperature range.