СИСТЕМА ECD, Diagnostic DTC:P0545, P0546

DTC Code DTC Name
P0545 Exhaust Gas Temperature Sensor Circuit Low (Bank 1 Sensor 1)
P0546 Exhaust Gas Temperature Sensor Circuit High (Bank 1 Sensor 1)

DESCRIPTION

The exhaust gas temperature sensors are installed before and after the CCo catalytic converter to sense the exhaust gas temperature.

A thermistor built into the sensor changes its resistance value according to the exhaust gas temperature. The lower the exhaust gas temperature, the greater the thermistor resistance value. The higher the exhaust gas temperature, the lower the thermistor resistance value.

The exhaust gas temperature sensor is powered by a 5 V supply from the THCI (B1S1) and THCO (B1S2) terminals of the ECM via resistor R.

Resistor R and the exhaust gas temperature sensor are connected in series. When the resistance value of the exhaust gas temperature sensor changes in accordance with changes in the exhaust gas temperature, the voltage at terminals THCI (B1S1) and THCO (B1S2) also changes.

DTC No. Detection Item DTC Detection Condition Trouble Area MIL Memory
P0545 Exhaust Gas Temperature Sensor Circuit Low (Bank 1 Sensor 1)

Exhaust gas temperature sensor B1S1 output voltage is 0.15 V or less.

(2 trip detection logic)

  • Open or short in exhaust gas temperature sensor B1S1 circuit

  • Exhaust gas temperature sensor B1S1

  • ECM

Comes on DTC stored
P0546 Exhaust Gas Temperature Sensor Circuit High (Bank 1 Sensor 1)

Exhaust gas temperature sensor B1S1 output voltage is 3.28 V or higher.

(2 trip detection logic)

  • Open or short in exhaust gas temperature sensor B1S1 circuit

  • Exhaust gas temperature sensor B1S1

  • ECM

Comes on DTC stored
Table 1. DTC Detection Drive Pattern
DTC No. DTC Detection Drive Pattern
P0545 Ignition switch ON for 2 seconds
P0546

Both of the following conditions are met for 2 seconds:

  • Engine coolant temperature is 80°C (176°F) or higher.

  • 11 minutes elapsed since engine started

Table 2. Related Data List
DTC No. Data List
P0545 Exhaust Temperature B1S1
P0546
Tip:

When DTC P0545 or P0546 is stored, check the exhaust gas temperature by entering the following menus on the GTS: Powertrain / Engine and ECT / Data List / Exhaust Temperature B1S1.

Temperature Displayed Malfunction
20°C (68°F) Open circuit
900°C (1652°F) Short circuit

WIRING DIAGRAM

A012N0IE04
Table 3.
*a Exhaust Gas Temperature Sensor B1S1

CAUTION / NOTICE / HINT

Note:

When replacing the ECM, perform ECM Initialization and Registration.

Click here Нажмите здесь

Tip:
  • When the ECM must be replaced, before replacing the ECM, perform the "Learning Values Save" function using the GTS. Then after installing a new ECM, perform all of the initialization and registration procedures for the "Learning Values Write" function by following the instructions shown on the GTS display.

  • Read freeze frame data using the GTS. Freeze frame data records the engine condition when malfunctions are detected. When troubleshooting, freeze frame data can help determine if the vehicle was moving or stationary, if the engine was warmed up or not, and other data from the time the malfunction occurred.

PROCEDURE

  1. READ VALUE USING GTS (EXHAUST TEMPERATURE B1S1)

    1. Connect the GTS to the DLC3.

    2. Start the engine and warm it up.

    3. Turn the GTS on.

    4. Enter the following menus: Powertrain / Engine and ECT / Data List / Exhaust Temperature B1S1.

      Powertrain > Engine and ECT > Data List
      Tester Display
      Exhaust Temperature B1S1
    5. Read the value.

      Standard
      Same as the actual exhaust gas temperature (50 to 700°C [122 to 1292°F] while idling after warm-up).
      Result
      Result Proceed to
      20°C (68°F) A
      900°C (1652°F) B
      Same as the actual exhaust gas temperature (50 to 700°C [122 to 1292°F] while idling after warm-up) C
      Tip:
      • If there is an open circuit, the GTS indicates 20°C (68°F).

      • If there is a short circuit, the GTS indicates 900°C (1652°F).

    B Нажмите здесь

    C Нажмите здесь

    GO TO STEP 5


    A
  2. READ VALUE USING GTS (CHECK FOR OPEN IN WIRE HARNESS)

    A012LPUC02
    *1 Exhaust Gas Temperature Sensor B1S1
    *2 ECM
    *a

    Front view of wire harness connector

    (to Exhaust Gas Temperature Sensor B1S1)

    1. Disconnect the exhaust gas temperature sensor B1S1 connector.

    2. Connect terminals B136-1 (THCI) and B136-2 (E2) of the exhaust gas temperature sensor B1S1 connector on the wire harness side.

    3. Connect the GTS to the DLC3.

    4. Turn the ignition switch to ON and turn the GTS on.

    5. Enter the following menus: Powertrain / Engine and ECT / Data List / Exhaust Temperature B1S1.

      Powertrain > Engine and ECT > Data List
      Tester Display
      Exhaust Temperature B1S1
    6. Read the value.

      Standard
      900°C (1652°F)
      Result
      Proceed to
      OK
      NG
    OK Нажмите здесь

    NG
  3. CHECK HARNESS AND CONNECTOR (EXHAUST GAS TEMPERATURE SENSOR B1S1 - ECM)

    1. Disconnect the exhaust gas temperature sensor B1S1 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
      B136-1 (THCI) - A101-50 (THCI) Always Below 1 Ω
      B136-2 (E2) - A101-51 (ETCI) Always Below 1 Ω
      Result
      Proceed to
      OK
      NG
    NG Нажмите здесь

    OK
  4. CONFIRM GOOD CONNECTION TO ECM. IF OK, REPLACE ECM

    1. Replace the ECM.

      Click hereНажмите здесь

      Result
      Proceed to
      NEXT
    NEXT
  5. CONFIRM WHETHER MALFUNCTION HAS BEEN SUCCESSFULLY REPAIRED

    1. Connect the GTS to the DLC3.

    2. Turn the ignition switch to ON and turn the GTS on.

    3. Clear the DTCs.

      Powertrain > Engine and ECT > Clear DTCs
    4. Turn the ignition switch off and wait for 30 seconds or more.

    5. Turn the ignition switch to ON and wait for 10 seconds or more.

    6. Start the engine and allow it to idle until the engine coolant temperature is 80°C (176°F) or higher.

    7. Confirm that 11 minutes or more elapsed after engine was started.

    8. Enter the following menus: Powertrain / Engine and ECT / Trouble Codes / Pending.

    9. Confirm that the pending DTC is not output again.

      Powertrain > Engine and ECT > Trouble Codes
      Result
      Proceed to
      NEXT
    NEXT

    END


  6. REPAIR OR REPLACE HARNESS OR CONNECTOR

    Result
    Proceed to
    NEXT
    NEXT Нажмите здесь

    GO TO STEP 5


  7. CONFIRM GOOD CONNECTION TO SENSOR. IF OK, REPLACE EXHAUST GAS TEMPERATURE SENSOR B1S1

    1. Replace the exhaust gas temperature sensor B1S1.

      Click hereНажмите здесь

      Result
      Proceed to
      NEXT
    NEXT Нажмите здесь

    GO TO STEP 5


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

    1. Disconnect the exhaust gas temperature sensor B1S1 connector.

      A012HH1C15
      *1 Exhaust Gas Temperature Sensor B1S1
      *2 ECM
    2. Connect the GTS to the DLC3.

    3. Turn the ignition switch to ON and turn the GTS on.

    4. Enter the following menus: Powertrain / Engine and ECT / Data List / Exhaust Temperature B1S1.

      Powertrain > Engine and ECT > Data List
      Tester Display
      Exhaust Temperature B1S1
    5. Read the value.

      Standard
      20°C (68°F)
      Result
      Proceed to
      OK
      NG
    OK Нажмите здесь

    NG
  9. CHECK HARNESS AND CONNECTOR (EXHAUST GAS TEMPERATURE SENSOR B1S1 - ECM)

    1. Disconnect the exhaust gas temperature sensor B1S1 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
      B136-1 (THCI) or A101-50 (THCI) - Body ground Always 10 kΩ or higher
      Result
      Proceed to
      OK
      NG
    NG Нажмите здесь

    GO TO STEP 6


    OK
  10. REPLACE ECM

    1. Replace the ECM.

      Click hereНажмите здесь

      Result
      Proceed to
      NEXT
    NEXT Нажмите здесь

    GO TO STEP 5


  11. REPLACE EXHAUST GAS TEMPERATURE SENSOR B1S1

    1. Replace the exhaust gas temperature sensor B1S1.

      Click hereНажмите здесь

      Result
      Proceed to
      NEXT
    NEXT Нажмите здесь

    GO TO STEP 5