P0117

DTC P0117: Engine Coolant Temp. (ECT) Circuit Low Input

Wiring Diagram










DTC Detecting Condition and Trouble Area






DTC Confirmation Procedure

NOTE:

Check to make sure that the following conditions are satisfied when using this DTC confirmation procedure.

- Intake air temp.: -14 °C, 6.8 °F or higher
- Altitude (barometric pressure): 2020 m, 6650 ft or less (540 mmHg, 72 kPa or more)

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 30 sec. or more.
4) Check DTC and pending DTC.

DTC Troubleshooting

NOTE:

- Before inspecting, be sure to check that coolant temp. meter in combination meter indicates normal operating temperature (Engine is not overheating).
- When this DTC and P1705 are stored together, also clear DTC stored in TCM after completion of repair.

1.
Was "Engine System Check" performed?
YES
Go to Step 2.
NO
Go to Engine System Check Engine System Check.

2. ECT sensor and its circuit check.

Connect scan tool with ignition switch turned OFF.
Turn ignition switch ON.
Check engine coolant temp. displayed on scan tool.

Is 205 °C (401 °F) indicated?
YES
Go to Step 3.
NO
Intermittent trouble check for intermittent referring to Intermittent and Poor Connection Inspection.

3. Check ECM voltage.

Disconnect connector from ECT sensor with ignition switch turned OFF.
Check proper connection to ECT sensor at "LT GRN" and "ORN" wire terminals.
If OK, then turn ON ignition switch, check voltage between "LT GRN" wire terminal and vehicle body ground.

Is voltage about 4 - 6 V at each terminal?
YES
Got to Step 6.
NO
Go to Step 4.

4. Check ECT sensor circuit insulation.

Disconnect connectors from ECT with ignition switch turned OFF.
Measure resistance between "LT GRN" wire terminal and body ground.

Is resistance infinity?
YES
Got to Step 5.
NO
"LT GRN" wire shorted to ground circuit. If wire are OK, substitute a known-good ECM and recheck.

5. Check ECT sensor short circuit.

Turn ON ignition switch.
Check voltage between "LT GRN" wire terminal and vehicle body ground.

Is voltage about 0 V at each terminal?
YES
Got to Step 6.
NO
"LT GRN" wire shorted to other circuits.
If wire are OK, substitute a known-good ECM and recheck.

6. Check ECT sensor.

Check ECT sensor according to Engine Coolant Temperature (ECT) Sensor Inspection Engine Coolant Temperature (ECT) Sensor Inspection.

Is it good condition?
YES
Substitute a known-good ECM and recheck.
NO
Replace ECT sensor.