Suzuki 2006 SX4, Service Manual

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1A-70 Engine General Information and Diagnosis:
DTC P0117 / P0118: Engine Coolant Temperature Circuit Low / High
S6RW0C1104022
Wiring Diagram
Refer to “DTC P0116: Engine Coolant Temperature Circuit Range / Performance”.
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 P0118 and P0113 are indicated together, it is possible that ECT sensor ground circuit is
open.
DTC detecting condition Trouble area
P0117:
Circuit voltage of ECT sensor is lower than 0.15 V for 5 sec.
(1 driving cycle detection logic)
• ECT sensor and/or its circuit
• ECM
P0118:
Circuit voltage of ECT 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 ECT sensor and ECM.
3) Check for proper terminal connection to ECT sensor and
ECM connectors.
4) If connections are OK, check that ECT sensor circuit is
as follows.
• Wiring harness resistance of each ECT sensor signal
and ground circuit is less than 3
Ω
.
• Insulation resistance of ECT sensor signal circuit is
infinity between ECT sensor connector and vehicle
body ground.
• Insulation resistance of wire harness is infinity
between ECT sensor signal terminal and each other
terminal at ECT sensor connector.
• Circuit voltage of each ECT 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 ECT sensor reference voltage check
1) Connect connectors to ECM.
2) Turn ignition switch to ON position.
3) Check that ECT sensor signal voltage is 5 V between
ECT sensor connector and vehicle body ground.
Is it in good condition?
Go to Step 4. Substitute a known-
good ECM and recheck.