Engine General Information and Diagnosis: 1A-79
DTC P0117: Engine Coolant Temperature Circuit Low
S7RS0B1104027
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 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. or more.
4) Check DTC.
10 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 5
Ω
?
“ORN” wire is high
resistance circuit.
Poor “C37-55”
connection.
Faulty ECM ground
circuit.
If circuit is OK,
substitute a known-
good ECM and recheck.
11 ECT sensor check
1) Check ECT sensor according to “ECT Sensor Inspection
in Section 1C”.
Is it in good condition?
Substitute a known-
good ECM and recheck.
Replace ECT sensor.
Step Action Yes No
DTC detecting condition Trouble area
ECT sensor output voltage is less than 0.15 V for 0.5 seconds
continuously.
(High engine coolant temperature (low voltage / low resistance))
(1 driving cycle detection logic)
• ECT sensor circuit
• ECT sensor
•ECM
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