1A
DTC P0118: Engine Coolant Temperature Circuit High
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 more than the specified value (Low engine coolant temperature (high voltage/high resistance))
(1 driving cycle detection logic)
• ECT sensor circuit
• ECT sensor
• ECM
NOTE:
When DTC P0108, P0113 and P0123 are indicated together, it is possible that “BLK/BLU” wire circuit is open.
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 –40 °C (–40 °F) indicated?
Go to Step 3.
Intermittent trouble. Check for intermittent referring to Intermittent and Poor Connection Inspection .
3
ECT 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
ECM voltage check
1) Turn OFF ignition switch.
2) Check for proper connection of ECM connector at “E119-16” terminals.
3) If OK, then turn ON ignition switch, measure voltage between “E119-16” wire terminal of ECM connector and vehicle body ground.
Is voltage about 4 – 6 V?
“GRN/BLK” wire open circuit. If wire and connection are OK, go to Step 5.
Go to Step 5.
5
ECT sensor harness voltage check
1) Disconnect connectors from ECM with ignition switch turned OFF.
2) Turn ON ignition switch.
3) 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 harness resistance check
1) Measure resistance between “E119-16” terminal of ECM connector and “GRN/BLK” wire terminal of ECT sensor connector with ignition switch turn OFF.
Is resistance below 5 Ω?
Go to Step 7.
“GRN/BLK” wire in high resistance circuit.
7
ECT sensor ground circuit check
1) Connect connectors to ECM.
2) Check for proper connection of ECT sensor connector at “BLK/BLU” wire terminal.
3) Measure resistance between “BLK/BLU” wire terminal of ECT sensor connector and vehicle body ground.
Is resistance below 5 Ω?
Go to Step 9.
Go to Step 8.
8
ECT sensor ground circuit check
1) Measure resistance between “E119-28” terminal of ECM connector and vehicle body ground.
Is resistance below 5 Ω?
“BLK/BLU” wire open circuit or high resistance circuit. Poor “E119-28” connection.
Faulty ECM ground circuit. If circuit are OK, substitute a known-good ECM and recheck.
9
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.