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EC-154
[QR (WITH EURO-OBD)]
DTC P0102, P0103 MAF SENSOR
DTC P0102, P0103 MAF SENSOR PFP:22680
Component Description BBS001B3
The mass air flow sensor is placed in the stream of intake air. It mea-
sures the intake flow rate by measuring a part of the entire intake
flow. The mass air flow sensor controls the temperature of the hot
wire to a certain amount. The heat generated by the hot wire is
reduced as the intake air flows around it. The more air, the greater
the heat loss.
Therefore, the electric current supplied to hot wire is changed to
maintain the temperature of the hot wire as air flow increases. The
ECM detects the air flow by means of this current change.
CONSULT-II Reference Value in Data Monitor Mode BBS001B4
Specification data are reference values.
On Board Diagnosis Logic BBS001B5
These self-diagnoses have the one trip detection logic.
FAIL-SAFE MODE
When the malfunction is detected, the ECM enters fail-safe mode and the MI lights up.
DTC Confirmation Procedure BBS001B6
NOTE:
If DTC Confirmation Procedure has been previously conducted, always turn ignition switch OFF and wait at
least 10 seconds before conducting the next test.
PROCEDURE FOR DTC P0102
With CONSULT-II
1. Turn ignition switch ON.
PBIB1604E
MONITOR ITEM CONDITION SPECIFICATION
MAS A/F SE-B1 See EC-123, "
TROUBLE DIAGNOSIS - SPECIFICATION VALUE" .
CAL/LD VALUE
● Engine: After warming up
● Air conditioner switch: OFF
● Shift lever: P or N (A/T), Neutral
(M/T)
● No load
Idle 10% - 35%
2,500 rpm 10% - 35%
MASS AIRFLOW
● Engine: After warming up
● Air conditioner switch: OFF
● Shift lever: P or N (A/T), Neutral
(M/T)
● No load
Idle 1.0 - 4.0 g·m/s
2,500 rpm 4.0 - 10.0 g·m/s
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.
● Harness or connectors
(The sensor circuit is open or shorted.)
● Intake air leaks
● Mass air flow sensor
P0103
0103
Mass air flow sensor circuit
high input
An excessively high voltage from the sensor
is sent to ECM.
● Harness or connectors
(The sensor circuit is open or shorted.)
● Mass air flow sensor
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.
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