5.
Read "DTC Status" parameter.
The Engine Coolant Temperature(ECT) Sensor measures the temperature of engine coolant. The Engine Coolant Temperature (ECT) Sensor is located near the thermostat housing of the cylinder head. ECT Sensor is a thermistor (A Variable Resistor that Changes Along with ECT) in series with a fixed resistor in the Engine Control Module (ECM). The ECM applies 5 volts to the ECT sensor. The ECM monitors the voltage across the ECT sensor and converts it into a temperature reading. When the engine is cold the ECT sensor resistance is high, and when the engine is warm the ECT sensor resistance is low. Therefore, when the engine is cold the ECM will receive a high voltage input, and when the engine is warm the ECM will receive a low voltage input. The signal from ECT sensor is used for Injection control, ignition timing, idle speed and cooling fan control.
If the measured fluctuation in coolant temperature at enable condition is out of the threshold value, P0116 is set.
Item | Detecting Condition | Possible Cause |
DTC Strategy | ● Rationality check | ● Poor connection ● ECTS |
Enable Conditions | ● Driving condition of High Heat generation ≥ 2times ● Driving condition of low Heat generation ≥ 2times | |
Threshold Value | ● 0.8℃ ＜ Max temp. - Min temp. ＜ 3.0℃ | |
Diagnostic Time | ||
MIL ON Condition | ● 2 driving cycle |
Temperature [℃ (℉)] | Resistance (kΩ) |
-40 (-40) | 48.14 |
-20 (-4) | 14.13 ~ 16.83 |
0 (32) | 5.79 |
20 (68) | 2.31 ~ 2.59 |
40 (104) | 1.15 |
60 (140) | 0.59 |
80 (176) | 0.32 |
Connect scantool to Data Link Connector(DLC).
IG "ON".
Select "Diagnostic Trouble Codes(DTCs)" mode, and then Press F4(DTAL) to check DTC'sinformation from the DTCs menu
Confirm that "DTC Readiness Flag" indicates "Complete". If not, drive the vehicle within conditionsnoted in the freeze frame data or enable conditions noted in the DTC detecting condition.
Read "DTC Status" parameter.
Is parameter displayed "History(Not Present) fault"?
History fault : DTC occurred but has been cleared.
Present fault : DTC is occurring at present time.
▶ Fault is intermittent caused by poor contact in the sensor’s and/or ECM’s connector or wasrepaired and ECM memory was not cleared. Thoroughly check connectors for looseness,poor connection, bending, corrosion, contamination, deterioration, or damage.Repair or replace as necessary and then go to "Verification of Vehicle Repair" procedure.
▶ Go to "Terminal & Connector Inspection" procedure.
Many malfunctions in the electrical system are caused by poor harness and terminals. Faults can also be caused by interference from other electrical systems, and mechanical or chemical damage.
Thoroughly check connectors for looseness, poor connection, bending, corrosion, contamination, deterioration, or damage.
Has a problem been found?
▶ Repair as necessary and go to "Verification of vehicle Repair" procedure.
▶ Go to "Power Circuit Inspection" procedure.
IG "OFF".
Disconnect ECTS connector.
IG "ON" ＆ ENG "OFF"
Measure voltage between terminal 1 of ECTS harness connector and chassis ground.
Measure voltage between terminal 2 of ECTS harness connector and chassis ground.
Specification : Terminal 1 Approx. 5V
Terminal 2 Approx. 0V
Is the measured voltage within specification ?
▶ Go to "Component Inspection" procedure.
▶ Repair or replace as necessary and then, go to "Verification of Vehicle Repair" procedure.
Check ECTS resistance.
IG "OFF".
Disconnect ECTS connector.
Measure resistance between terminal 1 and 2 of ECTS harness connector.(Component Side)
Temperature [℃ (℉)] | Resistance (kΩ) |
-40 (-40) | 48.14 |
-20 (-4) | 14.13 ~ 16.83 |
0 (32) | 5.79 |
20 (68) | 2.31 ~ 2.59 |
40 (104) | 1.15 |
60 (140) | 0.59 |
80 (176) | 0.32 |
Is the measured resistance within specification?
▶ Many malfunctions in the electrical system are caused by poor harness(es) and terminals. Faults can also be caused by interference from other electrical systems, and mechanical or chemical damage. So, check poor connections and the related circuit between ECM and component thoroughly. Repair as necessary and go to "Verification of Vehicle Repair" procedure.
▶ Substitute with a known - good ECTS and check for proper operation.
▶ If the problem is corrected, replace ECTS and go to "Verification of Vehicle Repair" procedure.
After a repair, it is essential to verify that the fault has been corrected.
Connect scan tool and select "Diagnostic Trouble Codes(DTCs)" mode.
Press F4(DTAL) and confirm that "DTC Readiness Flag" indicates "Complete".
If not, drive the vehicle within conditions noted in the freeze frame data or enable conditions.
Read "DTC Status" parameter.
Is parameter displayed "History(Not Present) fault"?
▶ System performing to specification at this time. Clear the DTC.
▶ Go to the applicable troubleshooting procedure.
