1A-77 Engine General Information and Diagnosis:
DTC P0103: Mass Air Flow Circuit High Input
S5JB0A1104019
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.
9
MAF sensor output signal check
1) Connect connectors to MAF and IAT sensor and ECM
with ignition switch turned OFF.
2) Measure voltage between “C37-26” and “C37-27”
terminals of ECM connector referring to “Mass Air Flow
(MAF) and Intake Air Temperature (IAT) Sensor On-
Vehicle Inspection: in Section 1C”.
Is each value within specified range?
Substitute a known-
good ECM and recheck.
Faulty MAF and IAT
sensor.
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 more 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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