P0117

4GR-FSE ENGINE CONTROL SYSTEM: SFI SYSTEM: P0115, P0117, P0118: Engine Coolant Temperature Circuit Malfunction

DESCRIPTION

A thermistor is built into the Engine Coolant Temperature (ECT) sensor, of which the resistance value varies according to the ECT.

The structure of the sensor and its connection to the ECM are the same as those of the Intake Air Temperature (IAT) sensor.

HINT
When any of DTCs P0115, P0117 and P0118 are set, the ECM enters fail-safe mode. During fail-safe mode, the ECT is estimated to be 80°C (176°F) by the ECM. Fail-safe mode continues until a pass condition is detected.





HINT
When any of these DTCs are set, check the ECT by entering the following menus on Techstream: Powertrain / Engine / Data List / All Data / Coolant Temp.





MONITOR DESCRIPTION

- The Engine Coolant Temperature (ECT) sensor is used to monitor the ECT. The ECT sensor has a thermistor with a resistance that varies according to the temperature of the engine coolant. When the coolant temperature is low, the resistance in the thermistor increases. When the temperature is high, the resistance drops. These variations in resistance are reflected in the output voltage from the sensor. The ECM monitors the sensor voltage and uses this value to calculate the ECT. When the sensor output voltage deviates from the normal operating range, the ECM interprets this as a fault in the ECT sensor and sets a DTC.

- Example:

- If the sensor output voltage is more than 4.91 V for 0.5 seconds or more, the ECM determines that there is an open in the ECT sensor circuit, and sets DTC P0118. Conversely, if the voltage output is less than 0.14 V for 0.5 seconds or more, the ECM determines that there is a short in the sensor circuit, and sets DTC P0117.

- If the malfunction is not repaired successfully, a DTC is set 0.5 seconds after the engine is next started.

MONITOR STRATEGY





TYPICAL ENABLING CONDITIONS





TYPICAL MALFUNCTION THRESHOLDS

P0115:





P0117:





P0118:





COMPONENT OPERATING RANGE





CONFIRMATION DRIVING PATTERN





1. Connect the Techstream to the DLC3.

2. Turn the engine switch on (IG) and turn the Techstream on.

3. Clear the DTCs (even if no DTCs are stored, perform the clear DTC procedure) DTC Check / Clear.

4. Turn the engine switch off and wait for 30 seconds.

5. Turn the engine switch on (IG) and turn the Techstream on [A].

6. Wait 0.5 seconds or more.

7. Enter the following menus: Powertrain / Engine / Trouble Codes.

8. Read the pending DTC [B].

HINT
- If a pending DTC is output, the system is malfunctioning.
- If a pending DTC is not output, perform the following procedure.

9. Enter the following menus: Powertrain / Engine / Utility / All Readiness.

10. Input the DTC: P0115, P0117 or P0118.

11. Check the DTC judgment result.





HINT
- If the judgment result shows ABNORMAL, the system has a malfunction.
- If the judgment result shows NORMAL, the system is normal.
- If the judgment result shows INCOMPLETE or UNKNOWN, perform step [A] again.

12. Enter the following menus: Powertrain / Engine / Utility / All Readiness.

13. Check the DTC judgment result.

HINT
- If the judgment result shows ABNORMAL, the system has a malfunction.
- If the judgment result shows NORMAL, the system is normal.

14. If the test result is INCOMPLETE or UNKNOWN and no DTC is output, perform a universal trip and check for permanent DTCs DTC Check / Clear.

HINT
- If a permanent DTC is output, the system is malfunctioning.
- If no permanent DTC is output, the system is normal.

WIRING DIAGRAM





INSPECTION PROCEDURE

HINT
- If other DTCs relating to different systems that have terminal E2 as the ground terminal are output simultaneously, terminal E2 may have an open circuit.
- Read freeze frame data using Techstream. The ECM records vehicle and driving condition information as freeze frame data the moment a DTC is stored. When troubleshooting, freeze frame data can be helpful in determining whether the vehicle was running or stopped, whether the engine was warmed up or not, whether the air/fuel ratio was lean or rich, as well as other data recorded at the time of a malfunction Freeze Frame Data.

PROCEDURE

1. READ VALUE USING TECHSTREAM (COOLANT TEMP)

(a) Connect Techstream to the DLC3.

(b) Turn the engine switch on (IG).

(c) Turn the Techstream on.

(d) Enter the following menus: Powertrain / Engine / Data List / All Data / Coolant Temp.

(e) Read the value displayed on the Techstream.

Standard:

Between 75°C and 100°C (167°F and 212°F) with warm engine.

Result:





HINT
- If there is an open circuit, Techstream indicates -40°C (-40°F).
- If there is a short circuit, Techstream indicates 140°C (284°F).

C -- CHECK FOR INTERMITTENT PROBLEMS Check For Intermittent Problems

B -- CHECK ENGINE COOLANT TEMPERATURE SENSOR (CHECK FOR SHORT IN SENSOR)
A -- Continue to next step.

2. CHECK ENGINE COOLANT TEMPERATURE SENSOR (CHECK FOR OPEN IN SENSOR)

(a) Confirm good connection at the Engine Coolant Temperature (ECT) sensor.





(b) Disconnect the E40 ECT sensor connector.

(c) Connect terminals 1 and 2 of the ECT sensor connector on the wire harness side.

(d) Connect Techstream to the DLC3.

(e) Turn the engine switch on (IG).

(f) Turn the Techstream on.

(g) Enter the following menus: Powertrain / Engine / Data List / All Data / Coolant Temp.

(h) Read the value displayed on the Techstream.

Standard:

140°C (284°F).

(i) Reconnect the ECT sensor connector.

OK -- REPLACE ENGINE COOLANT TEMPERATURE SENSOR Removal
NG -- Continue to next step.

3. CHECK ECM (CHECK FOR OPEN IN ECM)

(a) Disconnect the E40 ECT sensor connector.





(b) Connect terminals THW and E2 of the E3 and E5 ECM connectors.

HINT
Before checking, do visual and contact pressure checks on the ECM connector.

(c) Connect Techstream to the DLC3.

(d) Turn the engine switch on (IG).

(e) Turn the Techstream on.

(f) Enter the following menus: Powertrain / Engine / Data List / All Data / Coolant Temp.

(g) Read the value displayed on the Techstream.

Standard:

140°C (284°F).

(h) Reconnect the ECT sensor connector.

OK -- REPAIR OR REPLACE HARNESS OR CONNECTOR

NG -- REPLACE ECM Removal

4. CHECK ENGINE COOLANT TEMPERATURE SENSOR (CHECK FOR SHORT IN SENSOR)

(a) Disconnect the E40 ECT sensor connector.





(b) Connect Techstream to the DLC3.

(c) Turn the engine switch on (IG).

(d) Turn the Techstream on.

(e) Enter the following menus: Powertrain / Engine / Data List / All Data / Coolant Temp.

(f) Read the value displayed on the Techstream.

Standard:

-40°C (-40°F)

(g) Reconnect the ECT sensor connector.

OK -- REPLACE ENGINE COOLANT TEMPERATURE SENSOR Removal
NG -- Continue to next step.

5. CHECK ECM (CHECK FOR SHORT IN ECM)

(a) Disconnect the E3 and E5 ECM connectors.





(b) Connect Techstream to the DLC3.

(c) Turn the engine switch on (IG).

(d) Turn the Techstream on.

(e) Enter the following menus: Powertrain / Engine / Data List / All Data / Coolant Temp.

(f) Read the value displayed on the Techstream.

Standard:

-40°C (-40°F)

(g) Reconnect the ECM connector.

OK -- REPAIR OR REPLACE HARNESS OR CONNECTOR

NG -- REPLACE ECM Removal