Dtc P0103: Mass Or Volume Air Flow Circuit High Input - Suzuki Swift Sport 2004 Service & Repair Manual

DTC P0103: Mass or Volume Air Flow Circuit High Input

Wiring Diagram
Refer to "DTC P0101: Mass or Volume Air Flow Circuit Range / Performance".
DTC Detecting Condition and Trouble Area
MAF sensor output voltage is higher than 4.85 V for 0.5 seconds
continuously.
(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.
DTC Troubleshooting
NOTE
• When measuring circuit voltage, resistance and/or pulse signal at ECM connector, connect the
special tool to ECM and/or the ECM connectors referring to "Inspection of ECM and Its Circuits".
• Upon completion of inspection and repair work, perform "DTC Confirmation Procedure" and
confirm that the trouble has been corrected.
Step
1 Was "Engine and Emission Control System Check"
performed?
2 MAF sensor and its circuit check
1) Connect scan tool to DLC with ignition switch turned
OFF.
2) Start engine and check MAF value displayed on scan
tool. (Refer to "Scan Tool Data" for normal value.)
Is normal value indicated?
3 MAF sensor power supply voltage check
1) Disconnect connector from MAF and IAT sensor with
ignition switch tuned OFF.
2) Turn ON ignition switch, measure voltage between
engine ground and "BLK/RED" wire terminal of MAF and
IAT sensor connector.
Is voltage 10 – 14 V?
4 MAF sensor ground circuit check
1) Turn OFF ignition switch, measure resistance between
"GRY" wire terminal of MAF and IAT sensor connector
and engine ground.
Is resistance below 5
5 Ground circuit check
1) Remove ECM from its bracket with ECM connectors
connected.
2) Measure resistance between "C37-27" terminal of ECM
connector and engine ground.
Is resistance below 5
DTC detecting condition
Action
Ω
?
Ω
?
Engine General Information and Diagnosis:
• Open or short in MAF sensor circuit
• MAF sensor
• ECM
Yes
Go to Step 2.
Intermittent trouble.
Check for intermittent
referring to "Intermittent
and Poor Connection
Inspection in Section
00".
Go to Step 4.
Go to Step 6.
"GRY" wire is open or
high resistance circuit.
1A-63
S7RS0B1104019
Trouble area
No
Go to "Engine and
Emission Control
System Check".
Go to Step 3.
"BLK/RED" wire is open
circuit.
Go to Step 5.
ECM grounds "E23-31",
"C37-58", "C37-15" and/
or "C37-30" circuit are
open or high resistance.
If wires are OK,
substitute a known-
good ECM and recheck.