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ECD SYSTEM, Diagnostic DTC:P0545, P0546, P2032, P2033

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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)
P2032 Exhaust Gas Temperature Sensor Circuit Low (Bank 1 Sensor 2)
P2033 Exhaust Gas Temperature Sensor Circuit High (Bank 1 Sensor 2)
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DESCRIPTION

The exhaust gas temperature sensors are installed before and after the DPNR* 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 THCI (B1S1) and THCO (B1S2) 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 THCI (B1S1) and THCO (B1S2) also changes. When DPNR catalyst regeneration is needed, the ECM operates the exhaust fuel addition injector to obtain target upstream temperature of the DPNR catalytic converter as monitored through sensor 1. In addition, the ECM monitors the temperature increase of the DPNR catalytic converter using sensor 2.

*: Diesel Particulate-NOx Reduction system.

Table 1. P0545
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 70°C (158°F) or higher) and allowing 11 minutes to elapse after starting the engine.

Sensor 1 output is below 0.2 V for 3 seconds or more.

(1 trip detection logic)

  • Open or short in exhaust gas temperature sensor (B1S1) circuit

  • Exhaust gas temperature sensor (B1S1)

  • ECM
Table 2. P0546
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 70°C (158°F) or higher) and allowing 11 minutes to elapse after starting the engine.

Sensor 1 output is higher than 4.95 V for 3 seconds or more.

(1 trip detection logic)

  • Open or short in exhaust gas temperature sensor (B1S1) circuit

  • Exhaust gas temperature sensor (B1S1)

  • ECM
Table 3. P2032
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 70°C (158°F) or higher) and allowing 11 minutes to elapse after starting the engine.

Sensor 2 output is below 0.2 V for 3 seconds or more.

(1 trip detection logic)

  • Open or short in exhaust gas temperature sensor (B1S2) circuit

  • Exhaust gas temperature sensor (B1S2)

  • ECM
Table 4. P2033
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 70°C (158°F) or higher) and allowing 11 minutes to elapse after starting the engine.

Sensor 2 output is higher than 4.95 V for 3 seconds or more.

(1 trip detection logic)

  • Open or short in exhaust gas temperature sensor (B1S2) circuit

  • Exhaust gas temperature sensor (B1S2)

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

  • ECM
Table 5. Related Data List
DTC No. Data List
P0545 Exhaust Temperature B1S1
P0546
P2032 Exhaust Temperature B1S2
P2033
Tip:

  • DTC P20CF (Exhaust fuel addition injector malfunction) may be stored if there is an open malfunction in an exhaust gas temperature sensor circuit.

  • Sensor 1 represents the sensor located upstream in front of the DPNR catalytic converter.

  • Sensor 2 represents the sensor located downstream behind the DPNR catalytic converter.

  • After confirming DTC P0545, P0546, P2032, and/or P2033, check the upstream and downstream exhaust gas temperature in "Powertrain / Engine and ECT / Exhaust Temperature B1S1 and Exhaust Temperature B1S2" using the intelligent tester.

Table 6. 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) Short circuit
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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.

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WIRING DIAGRAM

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INSPECTION PROCEDURE

Note:

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

Tip:

If DTC P2033 is stored and the exhaust gas temperature sensor (B1S2) circuit is not malfunctioning, check if the DPNR catalytic converter has melted as DTC P2033 may be stored when the DPNR catalytic converter melts and the exhaust gas temperature sensor (B1S2) is exposed to high temperatures.

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PROCEDURE


  1. Click here

    READ VALUE USING INTELLIGENT TESTER (EXHAUST TEMPERATURE)


    1. Connect the intelligent tester to the DLC3.

    2. Turn the ignition switch to ON and turn the intelligent tester on.

    3. Enter the following menus: Powertrain / Engine and ECT / Data List / Exhaust Temperature B1S1 and Exhaust Temperature B1S2.

    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.
      Table 7. Result
      Temperature Displayed Proceed to
      -40°C (-40°F) A
      1000°C (1832°F) 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
      Tip:

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

      • If there is an open circuit, the intelligent tester will indicate 1000°C (1832°F).


  2. Click here

    READ VALUE USING INTELLIGENT TESTER (CHECK FOR OPEN IN WIRE HARNESS)


    1. A01ITJ1E13

      Disconnect the C58 or C57 exhaust gas temperature sensor connector.

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

    3. Connect the intelligent tester to the DLC3.

    4. Turn the ignition switch to ON and turn the intelligent tester on.

    5. Enter the following menus: Powertrain / Engine and ECT / Data List / Exhaust Temperature B1S1 and Exhaust Temperature B1S2.

    6. Read the value.

      Standard
      1000°C (1832°F)
      Table 8. Text in Illustration
      *1 Exhaust Gas Temperature Sensor
      *2 ECM
      *a

      Front view of wire harness connector

      (to Exhaust Gas Temperature Sensor (B1S1))
      *b

      Front view of wire harness connector

      (to Exhaust Gas Temperature Sensor (B1S2))

    7. Reconnect the exhaust gas temperature sensor connector.


  3. Click here

    REPLACE EXHAUST GAS TEMPERATURE SENSOR


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


  4. Click here

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


    1. A01IN5VE21

      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
      Tester Connection Condition Specified Condition
      C58-2 - C69-122 (THCI) Always Below 1 Ω
      C58-1 - C69-99 (ETCI) Always Below 1 Ω
      C57-2 - C69-121 (THCO) Always Below 1 Ω
      C57-1 - C69-120 (ETCO) Always Below 1 Ω
      Table 9. Text in Illustration
      *a

      Front view of wire harness connector

      (to Exhaust Gas Temperature Sensor (B1S1))
      *b

      Front view of wire harness connector

      (to Exhaust Gas Temperature Sensor (B1S2))
      *c

      Front view of wire harness connector

      (to ECM)

    4. Reconnect the exhaust gas temperature sensor connector.

    5. Reconnect the ECM connector.


  5. Click here

    REPLACE ECM


    1. Replace the ECM (Click here).


  6. Click here

    READ VALUE USING INTELLIGENT TESTER (CHECK FOR SHORT IN WIRE HARNESS)


    1. A01ISRTE01

      Disconnect the C58 or C57 exhaust gas temperature sensor connector.

    2. Connect the intelligent tester to the DLC3.

    3. Turn the ignition switch to ON and turn the intelligent tester on.

    4. Enter the following menus: Powertrain / Engine and ECT / Data List / Exhaust Temperature B1S1 and Exhaust Temperature B1S2.

    5. Read the value.

      Standard
      -40°C (-40°F)

    6. Reconnect the exhaust gas temperature sensor connector.

      Table 10. Text in Illustration
      *1 Exhaust Gas Temperature Sensor
      *2 ECM

    7. Reconnect the exhaust gas temperature sensor connector.


  7. Click here

    REPLACE EXHAUST GAS TEMPERATURE SENSOR


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


  8. Click here

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


    1. A01IN5VE22

      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
      Tester Connection Condition Specified Condition
      C58-2 or C69-122 (THCI) - Body ground Always 10 kΩ or higher
      C57-2 or C69-121 (THCO) - Body ground Always 10 kΩ or higher
      Table 11. Text in Illustration
      *a

      Front view of wire harness connector

      (to Exhaust Gas Temperature Sensor (B1S1))
      *b

      Front view of wire harness connector

      (to Exhaust Gas Temperature Sensor (B1S2))
      *c

      Front view of wire harness connector

      (to ECM)

    4. Reconnect the exhaust gas temperature sensor connector.

    5. Reconnect the ECM connector.


  9. Click here

    REPLACE ECM


    1. Replace the ECM (Click here).


  10. Click here

    REPAIR OR REPLACE HARNESS OR CONNECTOR


    1. Repair or replace the harness or connector.


  11. Click here

    CONFIRM WHETHER MALFUNCTION HAS BEEN SUCCESSFULLY REPAIRED


    1. Connect the intelligent tester 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 70°C (159°F) or higher) and allowing 11 minutes to elapse after starting the engine.

    5. Enter the following menus: Powertrain / Engine and ECT / DTC.

    6. Confirm that the DTC is not output again.


  12. Click here

    END