ECD SYSTEM, Diagnostic DTC:P2031, P2032, P2033

DTC Code DTC Name
P2031 Exhaust Gas Temperature Sensor Circuit (Bank 1 Sensor 2)
P2032 Exhaust Gas Temperature Sensor Circuit Low (Bank 1 Sensor 2)
P2033 Exhaust Gas Temperature Sensor Circuit High (Bank 1 Sensor 2)

DESCRIPTION

A01CJG6E03

The exhaust gas temperature sensors are installed in front of and behind the DPF (*1) 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 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 terminals THCI (bank 1 sensor 1) and THCO (bank 1 sensor 2) 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 (bank 1 sensor 1) and THCO (bank 1 sensor 2) also changes. Based on these signals, when DPF catalyst regeneration is needed, the ECM operates the injector to obtain target upstream temperature of the DPF catalytic converter as monitored through sensor 1. In addition, the ECM monitors the rate of DPF catalytic converter temperature increase using sensor 2.

*1: Diesel Particulate Filter

DTC No. DTC Detection Condition Trouble Area
P2031 Sensor 2 output is less than 0.2 V or more than 4.95 V for 8 seconds or more (1 trip detection logic)
  • Open or short in exhaust gas temperature sensor (on downstream) circuit

  • Exhaust gas temperature sensor (on downstream)

  • ECM

P2032

Sensor 2 output is less than 0.2 V for 8 seconds or more

(1 trip detection logic)


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

  • Exhaust gas temperature sensor (on downstream)

  • ECM

P2033

Sensor 2 output is more than 4.95 V for 8 seconds or more

(1 trip detection logic)


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

  • Exhaust gas temperature sensor (on downstream)

  • ECM

Tech Tips


  • Sensor 1 represents a sensor located upstream on the DPF catalytic converter.

  • Sensor 2 represents a sensor located downstream on the DPF catalytic converter.

  • After confirming DTC P2031, P2032, and P2033, check the upstream and downstream exhaust gas temperature by selecting the following menus on the tester: Powertrain / Engine and ECT / Exhaust Temp (In) and Exhaust Temp (Out).

    Result
    Condition Exhaust Gas Temperature Exhaust Gas Temperature Sensor Condition
    Idling after warm-up Constant at 50 to 700°C (122 to 1292°F) Normal
    0°C (32°F) Short circuit
    1000°C (1832°F) Open circuit

WIRING DIAGRAM

Refer to DTC P0544 Click here.

INSPECTION PROCEDURE

Note

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

PROCEDURE


  1. READ VALUE USING INTELLIGENT TESTER (EXHAUST GAS TEMPERATURE)


    1. Connect the intelligent tester to the DLC3.

    2. Turn the ignition switch to the ON position.

    3. Turn the tester on.

    4. Enter the following menu items: Powertrain / Engine and ECT / Exhaust Temp (Out).

    5. 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
      1000°C (1832°F) A
      0°C (32°F) (After warming up the engine) 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 the 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
    C
    A
  2. READ VALUE USING INTELLIGENT TESTER (OPEN IN WIRE HARNESS)


    1. A01CJ78E02

      Disconnect the 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 the ON position.

    5. Turn the tester on.

    6. Enter the following menu items: Powertrain / Engine and ECT / Exhaust Temp (Out).

    7. Read the value.

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


    NG
    OK
  3. READ VALUE USING INTELLIGENT TESTER (OPEN IN ECM)


    1. A01CH16E33

      Disconnect the exhaust gas temperature sensor connector.

    2. Connect terminals THCO and E2 of the ECM connectors.

      Tech Tips

      Before checking, do a visual and contact pressure check on the ECM connector.

    3. Connect the intelligent tester to the DLC3.

    4. Turn the ignition switch to the ON position.

    5. Turn the tester on.

    6. Enter the following menu items: Powertrain / Engine and ECT / Exhaust Temp (Out).

    7. Read the value.

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


    NG
    OK
  4. READ VALUE USING INTELLIGENT TESTER (SHORT IN WIRE HARNESS)


    1. A01CGKRE38

      Disconnect the exhaust gas temperature sensor connector.

    2. Connect the intelligent tester to the DLC3.

    3. Turn the ignition switch to the ON position.

    4. Turn the tester on.

    5. Enter the following menu items: Powertrain / Engine and ECT / Exhaust Temp (Out).

    6. Read the value.

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


    NG
    OK
  5. READ VALUE USING INTELLIGENT TESTER (SHORT IN ECM)


    1. A01CIZ8E04

      Disconnect the exhaust gas temperature sensor connector.

    2. Disconnect the ECM connector.

    3. Connect the intelligent tester to the DLC3.

    4. Turn the ignition switch to the ON position.

    5. Turn the tester on.

    6. Enter the following menu items: Powertrain / Engine and ECT / Exhaust Temp (Out).

    7. Read the value.

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

    9. Reconnect the ECM connector.


    NG
    OK