1A-95 Engine General Information and Diagnosis:
DTC P0118: Engine Coolant Temperature Circuit High
S5JB0A1104028
Wiring Diagram
Refer to “DTC P0116: Engine Coolant Temperature Circuit Range / Performance: ”.
DTC Detecting Condition and Trouble Area
NOTE
When DTC P0108, P0113 and P0533 are indicated together, it is possible that “GRY/GRN” wire circuit
open.
3
ECM voltage check
1) Disconnect connector from ECT sensor with ignition
switch turned OFF.
2) Check for proper connection to ECT sensor at “PPL/
YEL” and “GRY/GRN” wire terminals.
3) If OK, then turn ON ignition switch, measure voltage
between “PPL/YEL” 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 short circuit check
1) Disconnect connectors from ECM with ignition switch
turned OFF.
2) Measure resistance between “PPL/YEL” wire terminal of
ECT sensor connector and vehicle body ground.
Is resistance infinity?
Go to Step 5.
“PPL/YEL” wire is
shorted to ground
circuit.
If wire is OK, substitute
a known-good ECM and
recheck.
5
ECT sensor short circuit check
1) Turn ON ignition switch.
2) Measure voltage between “PPL/YEL” wire terminal of
ECT sensor connector and vehicle body ground.
Is voltage about 0 V?
Go to Step 6.
“PPL/YEL” wire is
shorted to other circuit.
If wire is 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: in Section 1C”.
Is it in good condition?
Substitute a known-
good ECM and recheck.
Replace ECT sensor.
Step
Action
Yes
No
I5JB0A110040-01
DTC detecting condition
Trouble area
DTC will be set when all of following conditions are detected for 0.5
seconds continuously.
• Engine is running
• Voltage of ECT sensor output is more than specified value
(Low engine coolant temperature (high voltage / high resistance))
(1 driving cycle detection logic)
• ECT sensor circuit
• ECT sensor
• ECM
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