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SEC266C
Component Description
NFEC0746
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
NFEC0747
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
NFEC1429
These self-diagnoses have the one trip detection logic.
DTC No.
Trouble diagnosis
name
DTC Detecting Condition Possible Cause
P0102
0102
Mass air flow sensor
circuit low input
An excessively low voltage from the sensor is sent
to ECM when engine is running.
I Harness or connectors
(The sensor circuit is open or
shorted.)
I Intake air leaks
I Mass air flow sensor
P0103
0103
Mass air flow sensor
circuit high input
An excessively high voltage from the sensor is
sent to ECM.
I Harness or connectors
(The sensor circuit is open or
shorted.)
I Mass air flow sensor
FAIL-SAFE MODE
NFEC1429S01
When the malfunction is detected, the ECM enters fail-safe mode and the MIL lights up.
Detected items Engine operating condition in fail-safe mode
Mass air flow sensor circuit Engine speed will not rise more than 2,400 rpm due to the fuel cut.
GI
MA
EM
LC
FE
CL
MT
AT
AX
SU
BR
ST
RS
BT
HA
SC
EL
IDX
DTC P0102, P0103 MAF SENSOR
Component Description
EC-195
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