Dtc P0112: Intake Air Temperature Sensor 1 Circuit Low - Suzuki Swift Sport 2004 Service & Repair Manual

1A-72 Engine General Information and Diagnosis:
Step
8 Ground circuit check
1) Connect connectors to ECM.
2) Check for proper connection of MAF and IAT sensor
connector at "GRY/BLU" wire terminal.
3) Measure resistance between "GRY/BLU" wire terminal
of MAF and IAT sensor connector and vehicle body
ground with ignition switch turned OFF.
Is resistance below 5
9 Ground circuit check
1) Remove ECM from its bracket with ECM connectors
connected.
2) Measure resistance between "C37-55" terminal of ECM
connector and vehicle body ground.
Is resistance below 3
10 IAT sensor check
1) Check IAT sensor according to "MAF and IAT Sensor
Inspection in Section 1C".
Is it in good condition?

DTC P0112: Intake Air Temperature Sensor 1 Circuit Low

Wiring Diagram
Refer to "DTC P0111: Intake Air Temperature Sensor 1 Circuit Range / Performance".
DTC Detecting Condition and Trouble Area
DTC detecting condition
IAT sensor output voltage is less than 0.15 V for 0.5 seconds
continuously.
(High intake air temperature (low voltage/low resistance))
(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.
Action
Ω
?
Ω
?
Yes
Go to Step 10.
"GRY/BLU" wire and/or
"ORN" wire is open or
high resistance circuit.
Poor "C37-55"
connection.
Substitute a known-
good ECM and recheck.
Trouble area
• IAT sensor circuit
• IAT sensor
• ECM
No
Go to Step 9.
Faulty ECM ground
circuit.
If circuit is OK,
substitute a known-
good ECM and recheck.
Replace MAF and IAT
sensor.
S7RS0B1104024