Suzuki 2006 SX4, Service Manual

Page: 111 / 1478

Engine General Information and Diagnosis: 1A-67
DTC Detecting Condition and Trouble Area
DTC Confirmation Procedure
1) With ignition switch OFF, connect scan tool.
2) Turn ON ignition switch and clear DTC by using scan tool.
3) Start engine and run it for 10 sec.
4) Check DTC.
DTC Troubleshooting
NOTE
When DTC P0113 and P0118 are indicated together, it is possible that IAT sensor ground is open.
DTC detecting condition Trouble area
P0112:
Circuit voltage of IAT sensor is lower than 0.15 V for 5 sec.
(1 driving cycle detection logic)
• IAT sensor and/or its circuit
• ECM
P0113:
Circuit voltage of IAT sensor is higher than 4.85 V for 5 sec.
(1 driving cycle detection logic)
Step Action Yes No
1 Was “Engine and Emission Control System Check”
performed? Go to Step 2. Go to “Engine and
Emission Control
System Check”.
2 Wire harness check
1) Turn ignition switch OFF position.
2) Disconnect connectors from IAT sensor and ECM.
3) Check for proper terminal connection to IAT sensor and
ECM connectors.
4) If connections are OK, check that IAT sensor circuit is as
follows.
• Wiring harness resistance of each IAT sensor signal
and ground circuit is less than 3
Ω
.
• Insulation resistance of IAT sensor signal circuit is
infinity between IAT sensor connector and vehicle
body ground.
• Insulation resistance of wire harness is infinity
between IAT sensor signal terminal and each other
terminal at MAF and IAT sensor connector.
• Circuit voltage of each IAT sensor signal and ground
circuit is 0 – 1 V with ignition switch turned ON.
Are they in good condition?
Go to Step 3. Repair or replace
defective wire harness.
3 IAT sensor reference voltage check
1) Connect connectors to ECM.
2) Turn ignition switch to ON position.
3) Check that IAT sensor signal voltage is 5 V between IAT
sensor connector and vehicle body ground.
Is it in good condition?
Go to Step 4. Substitute a known-
good ECM and recheck.
4 IAT sensor check
1) Check IAT sensor for performance referring to “Mass Air
Flow (MAF) and Intake Air Temperature (IAT) Sensor
Inspection in Section 1C”.
Is it in good condition?
Substitute a known-
good ECM and recheck. Replace MAF and IAT
sensor.