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SEC266C
Component Description
NFEC0840
The mass air flow sensor is placed in the stream of intake air. It
measures the intake flow rate by measuring a part of the entire
intake flow. It consists of a hot film that is supplied with electric
current from the ECM. The temperature of the hot film is controlled
by the ECM a certain amount. The heat generated by the hot film
is reduced as the intake air flows around it. The more air, the
greater the heat loss.
Therefore, the ECM must supply more electric current to maintain
the temperature of the hot film as air flow increases. The ECM
detects the air flow by means of this current change.
CONSULT-II Reference Value in Data Monitor
Mode
NFEC0841
Specification data are reference values.
MONITOR ITEM CONDITION SPECIFICATION
MAS A/F SE-B1
I Engine: After warming up
I Air conditioner switch: “OFF”
I Shift lever: “N”
I No-load
Idle 1.1 - 1.5V
2,500 rpm 1.7 - 2.4V
CAL/LD VALUE ditto
Idle 10 - 35%
2,500 rpm 10 - 35%
MASS AIRFLOW ditto
Idle 2.0 - 6.0 g·m/s
2,500 rpm 7.0 - 20.0 g·m/s
On Board Diagnosis Logic
NFEC1428
DTC No.
Trouble diagnosis
name
DTC Detecting Condition Possible Cause
P0101
0101
Mass air flow sensor
circuit range/
performance problem
A) A high voltage from the sensor is sent to
ECM under light load driving condition.
I Harness or connectors
(The sensor circuit is open or
shorted.)
I Mass air flow sensor
B) A low voltage from the sensor is sent to
ECM under heavy load driving condition.
I Harness or connectors
(The sensor circuit is open or
shorted.)
I Intake air leaks
I Mass air flow sensor
DTC P0101 MAF SENSOR
Component Description
EC-188
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