Dtc P0112: Intake Air Temperature Sensor Circuit Low - Suzuki 2006 SX4 Service Manual

1A-76 Engine General Information and Diagnosis:
Step
5 Wire circuit check
1) Disconnect connectors from ECM with ignition switch
turned OFF.
2) Measure resistance between "BLK/YEL" wire terminal of
MAF and IAT sensor connector and vehicle body
ground.
Is resistance infinity?
6 Wire circuit check
1) Turn ignition switch to ON position.
2) Measure voltage between "BLK/YEL" wire terminal of
MAF and IAT sensor connector and vehicle body
ground.
Is voltage about 0 V?
7 Wire circuit check
1) Measure resistance between "C01-25" terminal of ECM
connector and "BLK/YEL" wire terminal of MAF and IAT
sensor connector with ignition switch turned OFF.
Is resistance below 3
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 "C01-55" terminal of ECM
connector and vehicle body ground.
Is resistance below 3
10 IAT sensor check
1) Check IAT sensor according to "Intake Air Temperature
(IAT) Sensor Inspection in Section 1C".
Is it in good condition?

DTC P0112: Intake Air Temperature Sensor Circuit Low

Wiring Diagram
Refer to "DTC P0111: Intake Air Temperature Circuit Range / Performance".
DTC Detecting Condition and Trouble Area
Voltage of IAT sensor output is less than specified value with engine running.
(High intake air temperature (low voltage / low resistance))
(1 driving cycle detection logic)
Action
Ω
?
Ω
?
Ω
?
DTC detecting condition
Yes
Go to Step 6.
Go to Step 7.
Go to Step 8.
Go to Step 10.
"GRY/BLU" wire is open
or high resistance
circuit.
Poor "C01-55"
connection.
Substitute a known-
good ECM and recheck.
• IAT sensor circuit
• IAT sensor
• ECM
No
"BLK/YEL" wire is
shorted to ground or
other circuit.
If wire is OK, substitute
a known-good ECM and
recheck.
"BLK/YEL" wire shorted
to other circuit.
If wire is OK, substitute
a known-good ECM and
recheck.
"BLK/YEL" wire is high
resistance circuit.
Go to Step 9.
Faulty ECM ground
circuit.
If circuit is OK,
substitute a known-
good ECM and recheck.
Replace MAF and IAT
sensor.
S6RW0D1104024
Trouble area