SFI SYSTEM(w/o Canister Pump Module), Diagnostic DTC:P218211

DTC Code DTC Name
P218211 Engine Coolant Temperature Sensor 2 Circuit Short to Ground

DESCRIPTION

A thermistor, whose resistance value varies according to the engine coolant temperature, is built into the engine coolant temperature sensor (for cylinder head side). The structure of the sensor and its connection to the ECM are the same as those of the intake air temperature sensor.

Refer to DTC P00AA11.

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DTC No. Detection Item DTC Detection Condition Trouble Area MIL Memory Note
P218211 Engine Coolant Temperature Sensor 2 Circuit Short to Ground The engine coolant temperature sensor (for cylinder head side) output voltage is less than 0.081 V for 3 seconds or more (1 trip detection logic).

  • Short in engine coolant temperature sensor (for cylinder head side) circuit

  • Engine coolant temperature sensor (for cylinder head side)

  • ECM

 Comes on DTC stored SAE: P2184

Tech Tips

When a DTC is output, check the Data List item "Coolant Temperature Sensor2" using the GTS.

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DTC No. Coolant Temperature Sensor2 Malfunction
P218211 140°C (284°F) or higher Short to ground in THW2 circuit

If the Data List displays a normal value, the normal value may be due to a temporary recovery from the malfunction condition. Check for intermittent problems.

MONITOR DESCRIPTION

The engine coolant temperature sensor (for cylinder head side) is used to monitor the cylinder head side engine coolant temperature. The engine coolant temperature sensor (for cylinder head side) has a thermistor with a resistance that varies according to the temperature of the engine coolant. When the engine coolant temperature is low, the resistance in the thermistor increases. When the temperature is high, the resistance decreases. 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 engine coolant temperature. If the engine coolant temperature sensor (for cylinder head side) output voltage deviates from the normal operating range, the ECM interprets this as a malfunction in the engine coolant temperature sensor (for cylinder head side) circuit, illuminates the MIL and stores a DTC.

Example:

If the engine coolant temperature sensor (for cylinder head side) output voltage is less than 0.081 V for 3 seconds or more, the ECM will illuminate the MIL and store this DTC.

MONITOR STRATEGY

Frequency of Operation Continuous

CONFIRMATION DRIVING PATTERN


  1. Connect the GTS to the DLC3.

  2. Turn the engine switch on (IG).

  3. Turn the GTS on.

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

  5. Turn the engine switch off and wait for at least 30 seconds.

  6. Turn the engine switch on (IG).

  7. Turn the GTS on.

  8. Wait 5 seconds or more.

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

  10. Read the pending DTCs.

    Tech Tips


    • If a pending DTC is output, the system is malfunctioning.

    • If a pending DTC is not output, perform the following procedure.

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

  12. Input the DTC: P218211.

  13. Check the DTC judgment result.

    GTS Display Description
    NORMAL

    • DTC judgment completed

    • System normal
    ABNORMAL

    • DTC judgment completed

    • System abnormal
    INCOMPLETE

    • DTC judgment not completed

    • Perform driving pattern after confirming DTC enabling conditions

    Tech Tips


    • If the judgment result is NORMAL, the system is normal.

    • If the judgment result is ABNORMAL, the system is malfunctioning.

WIRING DIAGRAM

B0069X9E06
*a Engine Coolant Temperature Sensor (for Cylinder Head Side)

CAUTION / NOTICE / HINT

Tech Tips


  • If DTC P218211 is stored, check that the engine does not overheat (DTC P218211 may be stored due to engine overheating).

  • Read Freeze Frame Data using the GTS. The ECM records vehicle and driving condition information as Freeze Frame Data the moment a DTC is stored. When troubleshooting, Freeze Frame Data can help determine if the vehicle was moving or stationary, if the engine was warmed up or not, if the air fuel ratio was lean or rich, and other data from the time the malfunction occurred.

PROCEDURE


  1. READ VALUE USING GTS (CHECK FOR SHORT IN WIRE HARNESS)

    B006CI1C05
    *1 Engine Coolant Temperature Sensor (for Cylinder Head Side)
    *2 ECM

    1. Disconnect the engine coolant temperature sensor (for cylinder head side) connector.

    2. Connect the GTS to the DLC3.

    3. Turn the engine switch on (IG).

    4. Turn the GTS on.

    5. Enter the following menus: Powertrain / Engine / Data List / Coolant Temperature Sensor2.


      Powertrain > Engine > Data List
      Tester Display
      Coolant Temperature Sensor2

    6. According to the display on the GTS, read the Data List.

      OK
      GTS Display Specified Condition
      Coolant Temperature Sensor2 -40°C (-40°F)

      Tech Tips

      Perform "Inspection After Repair" after replacing the engine coolant temperature sensor (for cylinder head side).

      Click here

      Result
      Proceed to
      OK
      NG

    OK

    REPLACE ENGINE COOLANT TEMPERATURE SENSOR (FOR CYLINDER HEAD SIDE) Click here

    NG

  2. CHECK HARNESS AND CONNECTOR (ENGINE COOLANT TEMPERATURE SENSOR (FOR CYLINDER HEAD SIDE) - ECM)


    1. Disconnect the engine coolant temperature sensor (for cylinder head side) connector.

    2. Disconnect the ECM connector.

    3. Measure the resistance according to the value(s) in the table below.

      Standard Resistance
      Tester Connection Condition Specified Condition
      D20-2 (THW2) or D1-87 (THW2) - Body ground and other terminals Always 10 kΩ or higher
      Result
      Proceed to
      OK
      NG

    OK

    REPLACE ECM Click here

    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR