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SFI SYSTEM(w/ Canister Pump Module), Diagnostic DTC:P011B

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DTC Code DTC Name
P011B Engine Coolant Temperature / Intake Air Temperature Correlation
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DESCRIPTION

The engine has two temperature sensors, an engine coolant temperature sensor and an intake air temperature sensor, to detect temperature while the engine is operating. A thermistor, whose resistance value varies according to the temperature, is built into each sensor. When the temperature becomes low, the resistance of the thermistor increases. When the temperature becomes high, the resistance drops. These variations in resistance are transmitted to the ECM as voltage changes. Based on these temperature signals output from the sensors, the ECM determines the fuel injection duration and the ignition timing to control the engine.

DTC No. Detection Item DTC Detection Condition Trouble Area MIL Memory
P011B Engine Coolant Temperature / Intake Air Temperature Correlation

All of the following conditions are met (2 trip detection logic):


  1. The battery voltage is 10.5 V or higher.

  2. 7 hours or more have elapsed since the engine stopped on the previous trip.

  3. 88 seconds or more after a cold engine start.

  4. Either of the following conditions is met:


    1. The minimum intake air temperature after the engine starts is -10°C (14°F) or higher.

    2. The engine coolant temperature before the engine starts is -10°C (14°F) or higher.

  6. The difference between the readings of the engine coolant temperature and intake air temperature is higher than 20°C (36°F).

  • Intake air temperature sensor (mass air flow meter sub-assembly)

  • Engine coolant temperature sensor

  • ECM

 Comes on DTC stored
Tip:

  • Waiting is required to prevent the temperature of the engine from affecting the readings. If the engine has been operated recently, it is not possible to accurately compare the readings.


  • For diagnosis, in order to duplicate the detection conditions of the DTC, it is necessary to park the vehicle for 7 hours. Parking the vehicle for 7 hours ensures that the actual temperature of the engine coolant temperature and intake air temperature are very similar. When the vehicle has been parked for less than 7 hours, differences in the readings may exist, but this does not necessarily indicate a fault.

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MONITOR DESCRIPTION

The ECM monitors the difference between the engine coolant temperature and the intake air temperature when the engine is started cold to accurately detect the engine temperature conditions. The monitor runs when the engine is started after 7 hours or more have elapsed since the engine was stopped (engine switch turned off) on the previous trip. If the difference between the engine coolant temperature and the intake air temperature on a cold start exceeds 20°C (36°F), the ECM interprets this as a malfunction in the engine coolant temperature sensor circuit and intake air temperature sensor circuit, and stores this DTC.

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MONITOR STRATEGY

Frequency of Operation Once per driving cycle
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CONFIRMATION DRIVING PATTERN


  1. Connect the GTS to the DLC3.

  2. Turn the engine switch on (IG) and turn the GTS on [A].

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

  4. Turn the engine switch off.

  5. With the engine stopped, leave the vehicle as is for 7.5 hours or more [B].

  6. Turn the engine switch on (IG) and turn the GTS on.

  7. Start the engine and wait 2 minutes or more [C].

  8. Enter the following menus: Powertrain / Engine / Trouble Codes [D].

  9. Read the pending DTCs.

    Tip:

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

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

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

  11. Input the DTC: P011B.

  12. 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
    N/A

    • Unable to perform DTC judgment

    • Number of DTCs which do not fulfill DTC preconditions has reached ECU memory limit
    Tip:

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

    • If the judgment result shows ABNORMAL, the system has a malfunction.

    • If the judgment result shows INCOMPLETE or N/A, perform steps [A] through [D] again.

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CAUTION / NOTICE / HINT

Tip:

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.

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PROCEDURE


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    CHECK ANY OTHER DTCS OUTPUT (IN ADDITION TO DTC P011B)


    1. Connect the GTS to the DLC3.

    2. Turn the engine switch on (IG).

    3. Turn the GTS on.

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

    5. Read the DTCs.


      1. Powertrain > Engine > Trouble Codes


      Result
      Result Proceed to
      DTC P011B is output A
      DTC P011B and other DTCs are output B
      Tip:

      If any DTCs other than P011B are output, troubleshoot those DTCs first.


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    READ VALUE USING GTS (INTAKE AIR)


    1. Leave the vehicle for 7 hours or more.

      Tip:

      It is necessary to leave the vehicle for 7 hours or more to create conditions similar to the DTC detection conditions.

    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 / All Data / Intake Air.


      1. Powertrain > Engine > Data List
        Tester Display
        Intake Air




    6. Read the value displayed on the GTS.

      Standard
      Difference between the intake air temperature and the actual outside air temperature is within 10°C (18°F).
      Tip:

      • Temperature readings on the outside temperature gauge of the vehicle (if equipped) are not suitable for comparing to the intake air temperature reading. The outside temperature gauge has a significant delay built in to prevent swings in the temperature display. Use an accurate thermometer to determine the outside air temperature.

      • Perform "Inspection After Repair" after replacing the mass air flow meter sub-assembly.

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      Result
      Proceed to
      OK
      NG

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    READ VALUE USING GTS (COOLANT TEMP)


    1. Connect the GTS to the DLC3.

    2. Turn the engine switch on (IG).

    3. Turn the GTS on.

    4. Enter the following menus: Powertrain / Engine / Data List / All Data / Coolant Temp.


      1. Powertrain > Engine > Data List
        Tester Display
        Coolant Temp




    5. Read the value displayed on the GTS.

      Standard
      The difference between the coolant temperature and the actual outside air temperature is within 10°C (18°F).
      Tip:

      • If the result is not as specified, check that there are no heat sources such as a block heater in the engine compartment.

      • Perform "Inspection After Repair" after replacing the engine coolant temperature sensor.

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      Result
      Proceed to
      OK
      NG