ECD SYSTEM(w/ DPF), 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 NSR (NOx Storage Reduction) 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 connected to the ECM. The 5 V power source voltage in the ECM is applied to the exhaust gas temperature sensor from terminal THCI (B1S1) and THCO (B1S2) via resistor R.

The 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.

P0545
DTC Detection Drive Pattern DTC Detection Condition Trouble Area
Ignition switch ON for 2 seconds

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
P0546
DTC Detection Drive Pattern DTC Detection Condition Trouble Area

Both of following conditions are met for 2 seconds:


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

  • 11 minutes elapsed after engine start.

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
Related Data List
DTC No. Data List
P0545 Exhaust Temperature B1S1
P0546

Tech Tips

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
50°C (122°F) (engine warmed up) Open circuit
950°C (1742°F) Short circuit

WIRING DIAGRAM

A01VJ10E04

CAUTION / NOTICE / HINT

Note

When replacing the ECM, the ECM needs Registration and Initialization Click here.

Tech Tips


  • When the ECM must be replaced, before replacing the ECM, perform the "Learning Values Save" function using the GTS. Then after installing the new ECM, perform all of the initialization/registrations 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. Turn the ignition switch to ON.

    3. Turn the GTS on.

    4. Start the engine.

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

    6. Read the value.

      Standard
      The exhaust gas temperature varies in accordance with the vehicle conditions.
      Result
      Result Proceed to
      50°C (122°F) A
      950°C (1742°F) B
      The exhaust gas temperature varies in accordance with the vehicle conditions C

      Tech Tips


      • Since the display range of the GTS is 50°C (122°F) or higher, temperatures less than 50°C (122°F) will not be displayed properly.

      • If the exhaust gas temperature changes, there is no open or short circuit.

      • If there is an open circuit, the GTS indicates 50°C (122°F).

      • If there is a short circuit, the GTS indicates 950°C (1742°F).


    B

    READ VALUE USING GTS (CHECK FOR SHORT IN WIRE HARNESS) Click here

    C

    CONFIRM WHETHER MALFUNCTION HAS BEEN SUCCESSFULLY REPAIRED Click here

    A

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


    1. A01VGPXE02
      Text in Illustration
      *1 Exhaust Gas Temperature Sensor B1S1
      *2 ECM
      *a

      Front view of wire harness connector

      (to Exhaust Gas Temperature Sensor B1S1)

      Disconnect the exhaust gas temperature sensor B1S1 connector.

    2. Connect terminals B40-1 (THCI) and B40-2 (E2) of the exhaust gas temperature sensor (B1S1) wire harness side connector.

    3. Connect the GTS to the DLC3.

    4. Turn the ignition switch to ON.

    5. Turn the GTS on.

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

    7. Read the value.

      Standard value
      950°C (1742°F)
      Result
      Result Proceed to
      NG A
      OK B

    B

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

    A

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


    1. Disconnect the B40 exhaust gas temperature sensor B1S1 connector.

    2. Disconnect the B104 ECM connector (for LHD).

    3. Disconnect the B103 ECM connector (for RHD).

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

      Standard Resistance
      for LHD
      Tester Connection Condition Specified Condition
      B40-1 (THCI) - B104-124 (THCI) Always Below 1 Ω
      B40-2 (E2) - B104-125 (ETCI) Always Below 1 Ω
      for RHD
      Tester Connection Condition Specified Condition
      B40-1 (THCI) - B103-124 (THCI) Always Below 1 Ω
      B40-2 (E2) - B103-125 (ETCI) Always Below 1 Ω

    OK

    CONFIRM GOOD CONNECTION TO ECM. IF OK, REPLACE ECM Click here

    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR Click here

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


    1. A01VHVDE05
      Text in Illustration
      *1 Exhaust Gas Temperature Sensor B1S1
      *2 ECM

      Disconnect the B40 exhaust gas temperature sensor B1S1 connector.

    2. Connect the GTS to the DLC3.

    3. Turn the ignition switch to ON.

    4. Turn the GTS on.

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

    6. Read the value.

      Standard value
      50°C (122°F)
      Result
      Result Proceed to
      NG A
      OK B

    B

    REPLACE EXHAUST GAS TEMPERATURE SENSOR B1S1 Click here

    A

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


    1. Disconnect the B40 exhaust gas temperature sensor B1S1 connector.

    2. Disconnect the B104 ECM connector (for LHD).

    3. Disconnect the B103 ECM connector (for RHD).

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

      Standard Resistance
      for LHD
      Tester Connection Condition Specified Condition
      B40-1 (THCI) or B104-124 (THCI) - Body ground Always 10 kΩ or higher
      for RHD
      Tester Connection Condition Specified Condition
      B40-1 (THCI) or B103-124 (THCI) - Body ground Always 10 kΩ or higher

    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR Click here

    OK

  6. REPLACE ECM


    1. Replace the ECM Click here.


    NEXT

    CONFIRM WHETHER MALFUNCTION HAS BEEN SUCCESSFULLY REPAIRED Click here

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


    1. Replace the exhaust gas temperature sensor B1S1 Click here.


    NEXT

    CONFIRM WHETHER MALFUNCTION HAS BEEN SUCCESSFULLY REPAIRED Click here

  8. REPAIR OR REPLACE HARNESS OR CONNECTOR


    NEXT

    CONFIRM WHETHER MALFUNCTION HAS BEEN SUCCESSFULLY REPAIRED Click here

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


    1. Replace the ECM Click here.


    NEXT

    CONFIRM WHETHER MALFUNCTION HAS BEEN SUCCESSFULLY REPAIRED Click here

  10. REPLACE EXHAUST GAS TEMPERATURE SENSOR B1S1


    1. Replace the exhaust gas temperature sensor B1S1 Click here.


    NEXT

  11. CONFIRM WHETHER MALFUNCTION HAS BEEN SUCCESSFULLY REPAIRED


    1. Connect the GTS to the DLC3.

    2. Turn the ignition switch to ON.

    3. Turn the GTS on.

    4. Clear the DTCs Click here.

    5. Turn the ignition switch off and wait for 30 seconds or more.

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

    7. Start the engine and wait until the engine coolant temperature is 80°C (176°F) or higher.

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

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

    10. Confirm that the DTC is not output again.


    NEXT

    END