ECD SYSTEM (w/o Gear Shift Indicator), Diagnostic DTC:P0545, P0546, P2032, P2033

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)

DESCRIPTION

A003EK1E02

The exhaust gas temperature sensors are installed before and after the Diesel Particulate Filter (DPF) 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 DPF catalyst regeneration is needed, the ECM operates the exhaust fuel addition injector to obtain target upstream temperature of the DPF catalytic converter as monitored through sensor 1. In addition, the ECM monitors the temperature increase of the DPF catalytic converter using sensor 2.

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
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
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
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 DPF catalytic converter

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

Tech Tips


  • DTC P1386 (Exhaust fuel addition injector malfunction) may be stored if there is an open malfunction in an exhaust gas temperature sensor circuit.

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

  • Sensor 2 the represents sensor located downstream behind the DPF 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.

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
0°C (32°F) Open circuit
1000°C (1832°F) 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

A003E49E01

INSPECTION PROCEDURE

Note

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

Tech Tips

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

PROCEDURE


  1. 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.
      Result
      Temperature Displayed Proceed to
      0°C (32°F) (After warming up the engine) 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

      Tech Tips


      • If there is a short circuit, the intelligent tester will indicate 0°C (32°F).

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


    B

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

    C

    CONFIRM WHETHER MALFUNCTION HAS BEEN SUCCESSFULLY REPAIRED Click here

    A

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


    1. A003ED5E01
      Text in Illustration
      *1 Exhaust Gas Temperature Sensor
      *2 ECM
      *3

      Front view of wire harness connector

      (to Exhaust Gas Temperature Sensor (B1S1))
      *4

      Front view of wire harness connector

      (to Exhaust Gas Temperature Sensor (B1S2))

      Disconnect the B67 or B66 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)

    7. Reconnect the exhaust gas temperature sensor connector.


    NG

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

    OK

  3. REPLACE EXHAUST GAS TEMPERATURE SENSOR


    1. Replace the exhaust gas temperature sensor Click here.


    NEXT

    CONFIRM WHETHER MALFUNCTION HAS BEEN SUCCESSFULLY REPAIRED Click here

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


    1. A003BXIE01
      Text in Illustration
      *1

      Front view of wire harness connector

      (to Exhaust Gas Temperature Sensor (B1S1))
      *2

      Front view of wire harness connector

      (to Exhaust Gas Temperature Sensor (B1S2))
      *3

      Front view of wire harness connector

      (to ECM)

      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
      B67-2 - B39-122 (THCI) Always Below 1 Ω
      B67-1 - B39-99 (ETCI) Always Below 1 Ω
      B66-2 - B39-121 (THCO) Always Below 1 Ω
      B66-1 - B39-120 (ETCO) Always Below 1 Ω

    4. Reconnect the exhaust gas temperature sensor connector.

    5. Reconnect the ECM connector.


    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR Click here

    OK

  5. REPLACE ECM


    1. Replace the ECM Click here.


    NEXT

    CONFIRM WHETHER MALFUNCTION HAS BEEN SUCCESSFULLY REPAIRED Click here

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


    1. A003EJ7E01
      Text in Illustration
      *1 Exhaust Gas Temperature Sensor
      *2 ECM

      Disconnect the B67 or B66 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
      0°C (32°F)

    6. Reconnect the exhaust gas temperature sensor connector.

    7. Reconnect the exhaust gas temperature sensor connector.


    NG

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

    OK

  7. REPLACE EXHAUST GAS TEMPERATURE SENSOR


    1. Replace the exhaust gas temperature sensor Click here.


    NEXT

    CONFIRM WHETHER MALFUNCTION HAS BEEN SUCCESSFULLY REPAIRED Click here

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


    1. A003BXIE04
      Text in Illustration
      *1

      Front view of wire harness connector

      (to Exhaust Gas Temperature Sensor (B1S1))
      *2

      Front view of wire harness connector

      (to Exhaust Gas Temperature Sensor (B1S2))
      *3

      Front view of wire harness connector

      (to ECM)

      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
      B67-2 or B39-122 (THCI) - Body ground Always 10 kΩ or higher
      B66-2 or B39-121 (THCO) - Body ground Always 10 kΩ or higher

    4. Reconnect the exhaust gas temperature sensor connector.

    5. Reconnect the ECM connector.


    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR Click here

    OK

  9. REPLACE ECM


    1. Replace the ECM Click here.


    NEXT

    CONFIRM WHETHER MALFUNCTION HAS BEEN SUCCESSFULLY REPAIRED Click here

  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 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.


    NEXT

    END