Test Procedure

NOTE: Proceed to DTC testing steps listed in FAULT CODE SETTING CONDITION table of fault code setting condition.

FAULT CODE SETTING CONDITION

Fault Code	Application	Setting Condition	Testing
P1116	Vehicles with only an engine coolant temperature (ECT) sensor or both CHT and ECT sensor	KOEO, KOER	DX1
P1116	Vehicles with only a cylinder head temperature (CHT) sensor	KOEO, KOER	DL1
P1117	Vehicles with only an engine coolant temperature (ECT) sensor or both CHT and ECT sensor	Continuous Memory	DX15
P1117	Vehicles with only a cylinder head temperature (CHT) sensor	Continuous Memory	DL14

DX1 DTC P1116: CHECK THE COOLING SYSTEM

WARNING: TO AVOID PERSONAL INJURY DO NOT UNSCREW THE COOLANT PRESSURE RELIEF CAP WHILE THE ENGINE IS OPERATING OR HOT. THE COOLING SYSTEM IS UNDER PRESSURE. STEAM AND HOT LIQUID CAN COME OUT FORCEFULLY WHEN THE CAP IS LOOSENED SLIGHTLY.

The DTC indicates the temperature sensor is out of self-test range. The engine is not at normal operating temperature.
Possible causes:
- Cold engine.
- Low engine coolant.
- Engine overheat.
- Damaged harness.
- ECT sensor.
- Damaged PCM.
Check the vehicle coolant level.

Is the cooling system OK?

Yes	No
GO to DX2.	ENGINE COOLING for cooling system diagnostics. REPAIR as necessary.

DX2 CHECK IF THE VEHICLE ENGINE STARTS

Attempt to start the engine.

Does the engine start and run normally?

Yes	No
GO to DX5.	GO to DX3.

DX3 CHECK THE RESISTANCE OF THE ECT SENSOR WITH THE ENGINE OFF

Key in OFF position.
ECT Sensor connector disconnected.
NOTE: REFER to TEMPERATURE SENSOR VOLTAGE AND RESISTANCE SPECIFICATIONS at the beginning of this test for resistance specifications.

Measure the resistance between:

(+) ECT Sensor Connector, Component Side	(-) ECT Sensor Connector, Component Side
ECT	SIGRTN

Is the resistance within specification?

Yes	No
GO to DX4.	INSTALL a new ECT sensor.

DX4 CHECK CIRCUIT FROM MODULE TO COMPONENT

ECT Sensor connector connected.
Key in ON position.
Access the PCM and monitor the ECT V PID.
NOTE: REFER to TEMPERATURE SENSOR VOLTAGE AND RESISTANCE SPECIFICATIONS the chart at the beginning of this test for resistance specifications.
Using the data collected from the previous step, compare temperature resistance measured at the sensor to the PID temperature voltage measured at the PCM.

Does the measured value at the sensor agree with measured PID value at the PCM?

Yes	No
No Start or Stalls. Concern is elsewhere. RETURN to SYMPTOM CHARTS - GASOLINE MODELS for further direction.	CHECK the harness. GO to DX9.

DX5 CHECK THE ECT SENSOR OPERATION

Run the engine until the engine temperature stabilizes.
Verify the upper radiator hose is hot and the cooling system is pressurized.
Rerun the KOER self-test.
Check for self-test DTCs:

Is DTC P1116 present?

Yes	No
GO to DX6.	The engine temperature was not stabilized. REPAIR any other DTCs as necessary.

DX6 CHECK THE RESISTANCE OF THE ECT SENSOR

Vehicle must be at normal operating temperature.
Key in OFF position.
ECT Sensor connector disconnected.
NOTE: REFER to TEMPERATURE SENSOR VOLTAGE AND RESISTANCE SPECIFICATIONS the chart at the beginning of this test for resistance specifications.

Measure the resistance between:

(+) ECT Sensor Connector, Component Side	(-) ECT Sensor Connector, Component Side
ECT	SIGRTN

Is the resistance within specification?

Yes	No
INSTALL a new PCM. REFER to FLASH ELECTRICALLY ERASABLE PROGRAMMABLE READ ONLY MEMORY (EEPROM) .	INSTALL a new ECT sensor.

DX7 DTC P0118: CHECK ECT SIGNAL CIRCUIT

The DTC indicates the sensor signal is greater than the self-test maximum.
Possible causes:
- Open in the harness.
- Incorrect harness connections.
- Damaged sensor.
- Damaged PCM.
ECT Sensor connector disconnected.
Key in ON position.

Measure the voltage between:

(+) ECT Sensor Connector, Harness Side	(-) ECT Sensor Connector, Harness Side
ECT	SIGRTN

Is the voltage between 4.5 V - 5.5 V?

Yes	No
Key in OFF position. GO to DX8.	GO to DX9.

DX8 CHECK THE RESISTANCE OF THE ECT SENSOR WITH THE ENGINE OFF

Key in OFF position.
ECT Sensor connector disconnected.
NOTE: REFER to TEMPERATURE SENSOR VOLTAGE AND RESISTANCE SPECIFICATIONS at the beginning of this test for resistance specifications.

Measure the resistance between:

(+) ECT Sensor Connector, Component Side	(-) ECT Sensor Connector, Component Side
ECT	SIGRTN

Is the resistance within specification?

Yes	No
GO to DX10.	INSTALL a new ECT sensor.

DX9 CHECK THE SIGNAL AND SIGRTN CIRCUITS FOR AN OPEN IN THE HARNESS

PCM connector disconnected.

Measure the resistance between:

(+) PCM Connector, Harness Side	(-) ECT Sensor Connector, Harness Side
ECT	ECT
SIGRTN	SIGRTN

Are the resistances less than 5 ohms?

Yes	No
INSTALL a new PCM. REFER to FLASH ELECTRICALLY ERASABLE PROGRAMMABLE READ ONLY MEMORY (EEPROM) .	REPAIR the open circuit.

DX10 CHECK THE SENSOR SIGNAL FOR A SHORT TO VREF

Key in OFF position.
PCM connector disconnected.

Measure the resistance between:

(+) PCM Connector, Harness Side	(-) PCM Connector, Harness Side
ECT	VREF

Is the resistance greater than 10K ohms?

Yes	No
INSTALL a new PCM. REFER to FLASH ELECTRICALLY ERASABLE PROGRAMMABLE READ ONLY MEMORY (EEPROM) .	REPAIR the short circuit to VREF.

DX11 DTC P0117: SIMULATE AN OPPOSITE SIGNAL TO THE PCM

The DTC indicates the sensor signal is less than the self-test minimum.
Possible causes:
- Grounded circuit in the harness.
- Incorrect harness connections.
- Damaged sensor.
- Damaged PCM.
ECT Sensor connector disconnected.
Key in ON position.
Access the PCM and monitor the ECT V PID.

Is the voltage greater than 4.2 V?

Yes	No
Key in OFF position. INSTALL a new ECT sensor.	Key in OFF position. GO to DX12.

DX12 CHECK THE SENSOR SIGNAL FOR A SHORT TO GROUND

PCM connector disconnected.

Measure the resistance between:

(+) PCM Connector, Harness Side	(-) PCM Connector, Harness Side
ECT	SIGRTN

Measure the resistance between:

(+) PCM Connector, Harness Side	(-) 12 Volt Vehicle Battery
ECT	Negative terminal

Is the resistance greater than 10K ohms?

Yes	No
INSTALL a new PCM. REFER to FLASH ELECTRICALLY ERASABLE PROGRAMMABLE READ ONLY MEMORY (EEPROM) .	REPAIR the short circuit.

DX13 DTC P0116: CHECK THE RESISTANCE OF THE ECT SENSOR WITH THE ENGINE OFF

NOTE: Verify the engine temperature is at ambient room temperature before continuing with this test. A soak period of 6 hours may be required. Refer to POWERTRAIN DTC CHARTS AND DESCRIPTIONS - GASOLINE MODELS for information concerning P0116.

Key in OFF position.
ECT Sensor connector disconnected.
NOTE: REFER to TEMPERATURE SENSOR VOLTAGE AND RESISTANCE SPECIFICATIONS at the beginning of this test for resistance specifications.

Measure the resistance between:

(+) ECT Sensor Connector, Component Side	(-) ECT Sensor Connector, Component Side
ECT	SIGRTN

Is the resistance within specification?

Yes	No
Reconnect ECT. GO to DX14.	INSTALL a new ECT sensor.

DX14 DTC P0116: CHECK THE RESISTANCE OF THE ECT SENSOR

Run the engine until the engine temperature stabilizes.
NOTE: Verify the engine is at operating temperature before taking the ECT reading.
Key in OFF position.
ECT Sensor connector disconnected.
NOTE: REFER to TEMPERATURE SENSOR VOLTAGE AND RESISTANCE SPECIFICATIONS at the beginning of this test for resistance specifications.

Measure the resistance between:

(+) ECT Sensor Connector, Component Side	(-) ECT Sensor Connector, Component Side
ECT	SIGRTN

Is the resistance within specification?

Yes	No
The fault is not present at this time. CARRY OUT the OBD drive cycle to determine if fuel, HO2S, catalyst and misfire monitors can be executed. REFER to ON BOARD DIAGNOSTIC (OBD) DRIVE CYCLE .	INSTALL a new ECT sensor.

DX15 DTCS P0117, P0118, P0119 OR P1117: INTERMITTENT CHECK

Key in ON position.
Access the PCM and monitor the ECT V PID.
While observing the PID, carry out the following:
- Tap on the sensor to simulate road shock.
- Wiggle the sensor connector.

Is there a large change in the voltage reading?

Yes	No
DISCONNECT and INSPECT the connector. If OK, INSTALL a new ECT sensor.	GO to DX16.

DX16 CHECK THE ELECTRONIC ENGINE CONTROL (EC) WIRING HARNESS

Access the PCM and monitor the ECT V PID.
While observing the PID, carry out the following:
- Wiggle, shake, and bend small sections of the wiring harness while working from the sensor to the PCM.

Is there a large change in the voltage reading?

Yes	No
ISOLATE the fault. REPAIR as necessary.	Key in OFF position. GO to DX17.

DX17 CHECK THE PCM AND VEHICLE HARNESS CONNECTORS

PCM connector disconnected.
ECT Sensor connector disconnected.

Are the connectors and terminals OK?

Yes	No
The fault is not present at this time. DISREGARD the current diagnostic trouble code (DTC) at this time. ADDRESS the next DTC. GO to POWERTRAIN DTC CHARTS AND DESCRIPTIONS - GASOLINE MODELS .	REPAIR as necessary.

DX18 DTCS P0125 OR P0128: CHECK THE ENGINE COOLANT LEVEL

Diagnostic Trouble Code (DTC) indicates the engine coolant temperature has not achieved the required engine operation temperature level, since start-up within a specified amount of time.
Possible causes:
- Insufficient warm up time.
- Leaking or stuck-open thermostat.
- Low engine coolant.
Check the engine coolant level.

Is the engine coolant fill level correct?

Yes	No
GO to DX19.	REFER to the ENGINE COOLING for cooling system diagnostics.

DX19 CHECK SENSOR OPERATION

Run the engine until the engine temperature stabilizes.
Verify the upper radiator hose is hot and the cooling system is pressurized.
Access the PCM and monitor the ECT PID.

Is the temperature greater than 77°C (170.6°F)?

Yes	No
Test complete. DISREGARD the current diagnostic trouble code (DTC) at this time. ADDRESS the next DTC. GO to POWERTRAIN DTC CHARTS AND DESCRIPTIONS - GASOLINE MODELS .	REFER to the ENGINE COOLING for cooling system diagnostics.

DX20 DTC P0217: INDICATES AN ENGINE OVERHEAT CONDITION

Check the engine coolant level.

Is the engine coolant fill level correct?

Yes	No
REFER to the ENGINE COOLING to diagnose the overheating condition.	REFER to the ENGINE COOLING to diagnose the loss of coolant.

DX21 DTC P0298: ENGINE OIL OVER TEMPERATURE CONDITION

Engine oil temperature protection strategy in the PCM has been activated.
This protects the engine against mechanical damage due to overheating.
Check for an overheating condition and base engine concerns.

Are there any overheating or base engine concerns?

Yes	No
ISOLATE the fault. REPAIR as necessary.	GO to DX22.

DX22 CHECK FOR ECT DTCS

Check for self-test DTCs:

Are DTCs P0117, P0118, P1116 or P1117 present?

Yes	No
DISREGARD the current diagnostic trouble code (DTC) at this time. ADDRESS the next DTC. GO to POWERTRAIN DTC CHARTS AND DESCRIPTIONS - GASOLINE MODELS .	GO to DX23.

DX23 ROAD TEST THE VEHICLE AND MONITOR FOR ENGINE OVER TEMPERATURE

Access the Freeze Frame Data (if available) and record the DTC malfunction conditions.
Access the PCM and monitor the ECT PID.
Test drive the vehicle and allow the engine to reach normal operating temperature.
Observe ECT PID.

Does the engine overheat?

Yes	No
REFER to the ENGINE COOLING for cooling system diagnostics. REPAIR as necessary.	Unable to duplicate or identify the fault at this time.