Dtc P0103: Mass Air Flow Circuit High Input - Suzuki SX4 Service Manual

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Step
6
MAF sensor signal circuit check
1) Disconnect connectors from ECM with ignition switch
turned OFF.
2) Measure voltage between "GRN/BLK" wire terminal of
MAF and IAT sensor connector and engine ground with
ignition switch turned ON.
Is voltage 0 V?
7
MAF sensor signal circuit check
1) Measure resistance between "GRN/BLK" wire terminal
of MAF and IAT sensor connector and engine ground
with ignition switch turned OFF.
Is resistance infinity?
8
MAF sensor signal circuit check
1) Measure resistance between "GRN/BLK" wire terminal
of MAF and IAT sensor connector and "C01-26" terminal
of ECM connector.
Is resistance below 3
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 "C01-26" and "C01-27"
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?

DTC P0103: Mass Air Flow Circuit High Input

Wiring Diagram
Refer to "DTC P0101: Mass Air Flow Circuit Range / Performance".
DTC Detecting Condition and Trouble Area
Voltage of MAF sensor output is more than specified value for specified time
with engine running.
(1 driving cycle detection logic)
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.
Action
?
DTC detecting condition
Engine General Information and Diagnosis:
Yes
Go to Step 7.
Go to Step 8.
Go to Step 9.
Substitute a known-
good ECM and recheck.
• Open or short in MAF sensor circuit
• MAF sensor
• ECM
1A-67
No
"GRN/BLK" wire is
shorted to other circuit.
"GRN/BLK" wire is
shorted to ground
circuit.
"GRN/BLK" wire is open
or high resistance
circuit.
Faulty MAF and IAT
sensor.
S7RW0A1104021
Trouble area

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