1A
DTC P0117: Engine Coolant Temperature Circuit Low
Wiring Diagram
1. ECT sensor 2. ECM 3. To other sensors
DTC Detecting Condition and Trouble Area
DTC detecting condition Trouble area
DTC will be set when all of the following conditions are detected for 0.5 seconds continuously.
• Engine is running
• Voltage of ECT sensor output is less than the specified value (High engine coolant temperature (low voltage/low resistance))
(1 driving cycle detection logic)
• ECT sensor circuit
• ECT sensor
• ECM
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 and pending DTC.
DTC Troubleshooting
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:M13A with VVT .
2
ECT sensor and its circuit check
1) Connect scan tool with ignition switch turned OFF.
2) Turn ignition switch ON.
3) Check engine coolant temp. displayed on scan tool.
Is 119 °C (246 °F) indicated?
Go to Step 3.
Intermittent trouble. Check for intermittent referring to Intermittent and Poor Connection Inspection .
3
ECM voltage check
1) Disconnect connector from ECT sensor with ignition switch turned OFF.
2) Check for proper connection to ECT sensor at “GRN/BLK” and “BLK/BLU” wire terminals.
3) If OK, then turn ON ignition switch, measure voltage between “GRN/BLK” wire terminal of ECT sensor connector and vehicle body ground.
Is voltage about 4 – 6 V?
Go to Step 6.
Go to Step 4.
4
ECT sensor circuit insulation check
1) Disconnect connectors from ECM with ignition switch turned OFF.
2) Measure resistance between “GRN/BLK” wire terminal of ECT sensor connector and body ground.
Is resistance infinity?
Go to Step 5.
“GRN/BLK” wire shorted to ground circuit.
If wire are OK, substitute a known-good ECM and recheck.
5
ECT sensor short circuit check
1) Turn ON ignition switch.
2) Measure voltage between “GRN/BLK” wire terminal of ECT sensor connector and vehicle body ground.
Is voltage about 0 V?
Go to Step 6.
“GRN/BLK” wire shorted to other circuits.
If wire are OK, substitute a known-good ECM and recheck.
6
ECT sensor for performance check
1) Check ECT sensor according to Engine Coolant Temperature (ECT) Sensor Inspection:M13A .
Is it in good condition?
Substitute a known-good ECM and recheck.
Replace ECT sensor.
NOTE:
Upon completion of inspection and repair work, perform “DTC Confirmation Procedure” and confirm that the trouble has been corrected.