1A-75 Engine General Information and Diagnosis:
DTC P0102: Mass Air Flow Circuit Low Input
S5JB0A1104018
Wiring Diagram
Refer to “DTC P0101: Mass Air Flow Circuit Range / Performance: ”.
DTC Detecting Condition and Trouble Area
DTC Confirmation Procedure
1) With ignition switch turned OFF, connect scan tool.
2) Turn ON ignition switch and clear DTC using scan tool.
3) Start engine and run it for 10 sec.
4) Check DTC and pending DTC.
8
MAF sensor signal circuit check
1) Disconnect connectors from ECM with ignition switch
turned OFF.
2) Turn ON ignition switch, measure voltage between
“RED” wire terminal of MAF and IAT sensor connector
and engine ground.
Is voltage 0 V?
Go to Step 9.
“RED” wire is shorted to
others circuit.
9
MAF sensor signal circuit check
1) Turn OFF ignition switch, measure resistance between
“RED” wire terminal of MAF and IAT sensor connector
and engine ground.
Is resistance infinity?
Go to Step 10.
“RED” wire is shorted to
ground circuit.
10
MAF sensor signal circuit check
1) Measure resistance between “RED” wire terminal of
MAF and IAT sensor connector and “C37-26” terminal of
ECM connector.
Is resistance below 3
Ω
?
Faulty MAF and IAT
sensor.
“RED” wire is open or
high resistance circuit.
11
Is DTC P2135 detected?
Go to “DTC P2135:
Throttle Position Sensor
(Main / Sub) Voltage
Correlation: ”.
Go to Step 12.
12
Is DTC P0106 displayed?
Go to “DTC P0106:
Manifold Absolute
Pressure Range /
Performance: ”.
Substitute a known-
good ECM and recheck.
Step
Action
Yes
No
DTC detecting condition
Trouble area
DTC will be set when all of following conditions are
detected for 0.5 seconds continuously.
• Engine is running
• Voltage of MAF sensor output is less than specified
value for specified time continuously.
(1 driving cycle detection logic)
• Open or short in MAF sensor circuit
• MAF sensor
• ECM
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