ECD SYSTEM(w/ DPF), Diagnostic DTC:P0548, P0549, P2035, P2036, P2468, P2469

DTC Code DTC Name
P0548 Exhaust Gas Temperature Sensor Circuit Low (Bank 2 Sensor 1)
P0549 Exhaust Gas Temperature Sensor Circuit High (Bank 2 Sensor 1)
P2035 Exhaust Gas Temperature Sensor Circuit Low (Bank 2 Sensor 2)
P2036 Exhaust Gas Temperature Sensor Circuit High (Bank 2 Sensor 2)
P2468 Exhaust Gas Temperature Sensor Circuit Low (Bank 2 Sensor 3)
P2469 Exhaust Gas Temperature Sensor Circuit High (Bank 2 Sensor 3)

DESCRIPTION

A01WSDUE12

The exhaust gas temperature sensors are installed before and after the DPF catalytic converter and before 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 higher 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 TCF2 (B2S1), TCI2 (B2S2) and TCO2 (B2S3) 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 the exhaust gas temperature, the voltage at terminals TCF2 (B2S1), TCI2 (B2S2) and TCO2 (B2S3) also changes. The exhaust gas temperature sensor monitors the temperature upstream of the CCo catalyst converter. The No. 3exhaust gas temperature sensor monitors the temperature upstream of the DPF catalyst converter. The No. 4 exhaust gas temperature sensor monitors the rise in temperature of the DPF catalyst converter. When PM forced regeneration is needed, the ECM operates the exhaust fuel addition injector assembly to obtain target upstream temperature of the DPF catalytic converter as monitored through sensor 2. In addition, the ECM monitors the temperature increase of the DPF catalytic converter using sensor 3.

P0548
DTC Detection Drive Pattern DTC Detection Condition Trouble Area
Idle the engine for 3 seconds after warming up the engine (the engine coolant temperature is 60°C (140°F) or higher) and allowing 11 minutes to elapse after starting the engine.

Exhaust gas temperature sensor (B2S1) output voltage is below 0.2 V for 3 seconds or more when all conditions are met. (1 trip detection logic):


  • After starting the engine, 11 minutes or more elapses

  • Engine is running

  • Coolant temperature is 60°C (140°F) or more


  • Open or short in exhaust gas temperature sensor (B2S1) circuit

  • Exhaust gas temperature sensor (B2S1)

  • ECM

P0549
DTC Detection Drive Pattern DTC Detection Condition Trouble Area
Idle the engine for 3 seconds after warming up the engine (the engine coolant temperature is 60°C (140°F) or higher) and allowing 11 minutes to elapse after starting the engine.

Exhaust gas temperature sensor (B2S1) output voltage is higher than 4.95 V for 3 seconds or more when all conditions are met. (1 trip detection logic):


  • After starting the engine, 11 minutes or more elapses

  • Engine is running

  • Coolant temperature is 60°C (140°F) or more


  • Open or short in exhaust gas temperature sensor (B2S1) circuit

  • Exhaust gas temperature sensor (B2S1)

  • ECM

P2035
DTC Detection Drive Pattern DTC Detection Condition Trouble Area
Idle the engine for 3 seconds after warming up the engine (the engine coolant temperature is 60°C (140°F) or higher) and allowing 11 minutes to elapse after starting the engine.

No. 3 exhaust gas temperature sensor (B2S2) output voltage is below 0.2 V for 3 seconds or more when all conditions are met. (1 trip detection logic):


  • After starting the engine, 11 minutes or more elapses

  • Engine is running

  • Coolant temperature is 60°C (140°F) or more


  • Open or short in No. 3 exhaust gas temperature sensor (B2S2) circuit

  • No. 3 exhaust gas temperature sensor (B2S2)

  • ECM

P2036
DTC Detection Drive Pattern DTC Detection Condition Trouble Area
Idle the engine for 3 seconds after warming up the engine (the engine coolant temperature is 60°C (140°F) or higher) and allowing 11 minutes to elapse after starting the engine.

No. 3 exhaust gas temperature sensor (B2S2) output voltage is higher than 4.95 V for 3 seconds or more when all conditions are met. (1 trip detection logic):


  • After starting the engine, 11 minutes or more elapses

  • Engine is running

  • Coolant temperature is 60°C (140°F) or more


  • Open or short in No. 3 exhaust gas temperature sensor (B2S2) circuit

  • No. 3 exhaust gas temperature sensor (B2S2)

  • ECM

P2468
DTC Detection Drive Pattern DTC Detection Condition Trouble Area
Idle the engine for 3 seconds after warming up the engine (the engine coolant temperature is 60°C (140°F) or higher) and allowing 11 minutes to elapse after starting the engine.

No. 4 exhaust gas temperature sensor (B2S3) output voltage is below 0.2 V for 3 seconds or more when all conditions are met. (1 trip detection logic):


  • After starting the engine, 11 minutes or more elapses

  • Engine is running

  • Coolant temperature is 60°C (140°F) or more


  • Open or short in No. 4 exhaust gas temperature sensor (B2S3) circuit

  • No. 4 exhaust gas temperature sensor (B2S3)

  • ECM

P2469
DTC Detection Drive Pattern DTC Detection Condition Trouble Area
Idle the engine for 3 seconds after warming up the engine (the engine coolant temperature is 60°C (140°F) or higher) and allowing 11 minutes to elapse after starting the engine.

No. 4 exhaust gas temperature sensor (B2S3) output voltage is higher than 4.95 V for 3 seconds or more when all conditions are met. (1 trip detection logic):


  • After starting the engine, 11 minutes or more elapses

  • Engine is running

  • Coolant temperature is 60°C (140°F) or more


  • Open or short in No. 4 exhaust gas temperature sensor (B2S3) circuit

  • No. 4 exhaust gas temperature sensor (B2S3)

  • Abnormal rise in temperature due to melting of DPF catalytic converter

  • ECM

Related Data List
DTC No. Data List

P0548

P0549

Exhaust Temperature B2S1

P2035

P2036

Exhaust Temperature B2S2

P2468

P2469

Exhaust Temperature B2S3

Tech Tips


  • DTC P20D5 (Exhaust fuel addition injector assembly (for bank 2) malfunction) may be stored if there is an open malfunction in an exhaust gas temperature sensor circuit.

  • Sensor 1 represents the sensor located upstream of the CCo catalytic converter.

  • Sensor 2 represents the sensor located upstream of the DPF catalytic converter.

  • Sensor 3 represents the sensor located downstream of the DPF catalytic converter.

  • When DTC P0548, P0549, P2035, P2036, P2468 and/or P2469 is output, check the upstream and downstream exhaust gas temperature indicated by "Engine and ECT / Exhaust Temperature B2S1, Exhaust Temperature B2S2 and Exhaust Temperature B2S3" using the GTS.

Reference:
Condition Exhaust Gas Temperature Exhaust Gas Temperature Sensor Condition
Idling after warm-up Constant at between 50 and 700°C (122 and 1292°F) Normal
-40°C (-40°F) Open circuit
1000°C (1832°F) or higher Short circuit

MONITOR DESCRIPTION

The ECM constantly monitors the output voltages from the exhaust gas temperature sensors in order to detect problems with the sensors. When the sensor output voltage deviates from the normal operating range (between 0.2 V and 4.95 V) for more than 3 seconds after the engine is warmed up, the ECM interprets this as malfunction of the sensor circuit and illuminates the MIL.

WIRING DIAGRAM

Refer to DTC P0545 Click here.

CAUTION / NOTICE / HINT

Note


  • After replacing the ECM, the new ECM needs registration (See page ) and initialization Click here.

  • After replacing the fuel supply pump assembly, the ECM needs initialization Click here.

  • After replacing an injector assembly, the ECM needs registration Click here.

Tech Tips


  • 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.

  • If DTC P2469 is stored and the exhaust gas temperature sensor (B2S3) circuit is not malfunctioning, check if the DPF catalytic converter has melted as DTC P2469 may be stored when the DPF catalytic converter melts and the exhaust gas temperature sensor (B2S3) is exposed to high temperatures.

PROCEDURE


  1. READ VALUE USING GTS (EXHAUST TEMPERATURE)


    1. Connect the GTS to the DLC3.

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

    3. Enter the following menus: Engine and ECT / Data List / Exhaust Temperature B2S1, Exhaust Temperature B2S2 and Exhaust Temperature B2S3.

    4. Read the value.

      Standard
      Same as the actual exhaust gas temperature (50 to 700°C [122 to 1292°F] during idling after warm-up), and varies after an engine speed of 3000 rpm is maintained for 1 minute.
      Result
      Temperature Displayed Proceed to
      -40°C (-40°F) (After warming up the engine) A
      1000°C (1832°F) or higher B
      OK: Same as the actual exhaust gas temperature (50 to 700°C [122 to 1292°F]) during idling after warm-up, and varies after maintaining an engine speed of 3000 rpm for 1 minute after accelerating the engine from idling to 3000 rpm C

      Tech Tips


      • If there is a short circuit, the GTS will indicate -40°C (-40°F).

      • If there is an open circuit, the GTS will indicate 1000°C (1832°F) or higher.


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


    1. A01WW0TE02
      Text in Illustration
      *1 Exhaust Gas Temperature Sensor
      *2 ECM
      *a

      Front view of wire harness connector

      (to Exhaust Gas Temperature Sensor (B2S1))

      *b

      Front view of wire harness connector

      (to No. 3 Exhaust Gas Temperature Sensor (B2S2))

      *c

      Front view of wire harness connector

      (to No. 4 Exhaust Gas Temperature Sensor (B2S3))

      Disconnect the C164, C165 or C167 exhaust gas temperature sensor connector.

    2. Connect terminals 1 and 2 of the exhaust gas temperature sensor wire harness side connector.

    3. Connect the GTS to the DLC3.

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

    5. Enter the following menus: Engine and ECT / Data List / Exhaust Temperature B2S1, Exhaust Temperature B2S2 and Exhaust Temperature B2S3.

    6. Read the value.

      Standard
      1000°C (1832°F) or higher
    7. Reconnect the exhaust gas temperature sensor connector.


    NG
    OK
  3. REPLACE EXHAUST GAS TEMPERATURE SENSOR


    1. Replace the exhaust gas temperature sensor (B2S1) Click here.

    2. Replace the No. 3 exhaust gas temperature sensor (B2S2) Click here.

    3. Replace the No. 4 exhaust gas temperature sensor (B2S3) Click here.


    NEXT
  4. CHECK HARNESS AND CONNECTOR (EXHAUST GAS TEMPERATURE SENSOR - ECM)


    1. Disconnect the exhaust gas temperature sensor connector.

    2. Disconnect the ECM connector.

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

      Standard Resistance
      for LHD
      Tester Connection Condition Specified Condition
      C133-2 (TCF2) - C110-68 (TCF2) Always Below 1 Ω
      C133-1 (E2) - C110-99 (ETCF) Always Below 1 Ω
      C134-2 (TCI2) - C110-98 (TCI2) Always Below 1 Ω
      C134-1 (E2) - C110-99 (ETCF) Always Below 1 Ω
      C136-2 (TCO2) - C110-124 (TCO2) Always Below 1 Ω
      C136-1 (E2) - C110-99 (ETCF) Always Below 1 Ω
      for RHD
      Tester Connection Condition Specified Condition
      C133-2 (TCF2) - C138-68 (TCF2) Always Below 1 Ω
      C133-1 (E2) - C138-99 (ETCF) Always Below 1 Ω
      C134-2 (TCI2) - C138-98 (TCI2) Always Below 1 Ω
      C134-1 (E2) - C138-99 (ETCF) Always Below 1 Ω
      C136-2 (TCO2) - C138-124 (TCO2) Always Below 1 Ω
      C136-1 (E2) - C138-99 (ETCF) Always Below 1 Ω
    4. Reconnect the exhaust gas temperature sensor connector.

    5. Reconnect the ECM connector.


    NG
    OK
  5. REPLACE ECM


    1. Replace the ECM Click here.


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


    1. A01WSJ9E05
      Text in Illustration
      *1 Exhaust Gas Temperature Sensor
      *2 ECM

      Disconnect the C164, C165 or C167 exhaust gas temperature sensor connector.

    2. Connect the GTS to the DLC3.

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

    4. Enter the following menus: Engine and ECT / Data List / Exhaust Temperature B2S1, Exhaust Temperature B2S2 and Exhaust Temperature B2S3.

    5. Read the value.

      Standard
      0°C (32°F)
    6. Reconnect the exhaust gas temperature sensor connector.

    7. Reconnect the exhaust gas temperature sensor connector.


    NG
    OK
  7. REPLACE EXHAUST GAS TEMPERATURE SENSOR


    1. Replace the exhaust gas temperature sensor (B2S1) Click here.

    2. Replace the No. 3 exhaust gas temperature sensor (B2S2) Click here.

    3. Replace the No. 4 exhaust gas temperature sensor (B2S3) Click here.


    NEXT
  8. CHECK HARNESS AND CONNECTOR (EXHAUST GAS TEMPERATURE SENSOR - ECM)


    1. Disconnect the exhaust gas temperature sensor connector.

    2. Disconnect the ECM connector.

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

      Standard Resistance
      for LHD
      Tester Connection Condition Specified Condition
      C133-2 (TCF2) or C110-68 (TCF2) - Body ground Always 10 kΩ or higher
      C134-2 (TCI2) or C110-98 (TCI2) - Body ground Always 10 kΩ or higher
      C136-2 (TCO2) or C110-124 (TCO2) - Body ground Always 10 kΩ or higher
      for RHD
      Tester Connection Condition Specified Condition
      C133-2 (TCF2) or C138-68 (TCF2) - Body ground Always 10 kΩ or higher
      C134-2 (TCI2) or C138-98 (TCI2) - Body ground Always 10 kΩ or higher
      C136-2 (TCO2) or C138-124 (TCO2) - Body ground Always 10 kΩ or higher
    4. Reconnect the exhaust gas temperature sensor connector.

    5. Reconnect the ECM connector.


    NG
    OK
  9. REPLACE ECM


    1. Replace the ECM Click here.


    NEXT
  10. REPAIR OR REPLACE HARNESS OR CONNECTOR


    1. Repair or replace the harness or connector.


    NEXT
  11. CONFIRM WHETHER MALFUNCTION HAS BEEN SUCCESSFULLY REPAIRED


    1. Connect the GTS to the DLC3.

    2. Clear the DTCs Click here.

    3. Start the engine.

    4. Idle the engine for 3 seconds or more after warming up the engine (the engine coolant temperature is 60°C (140°F) or higher) and allowing 11 minutes to elapse after starting the engine.

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

    6. Confirm that the DTC is not output again.


    NEXT