ECD SYSTEM, Diagnostic DTC:P040C, P040D

DTC Code DTC Name
P040C Exhaust Gas Recirculation Temperature Sensor "A" Circuit Low
P040D Exhaust Gas Recirculation Temperature Sensor "A" Circuit High

DESCRIPTION

The EGR gas temperature sensor is located on the EGR cooler.

The EGR gas temperature sensor is required for the exact control of the exhaust gas recirculation.

A thermistor built into the sensor changes its resistance value according to the exhaust gas recirculation temperature. The lower the exhaust gas recirculation temperature, the greater the thermistor resistance value. The higher the exhaust gas recirculation temperature, the lower the thermistor resistance value.

The EGR gas temperature sensor is connected to the ECM. The 5 V power source voltage in the ECM is applied to the EGR gas temperature sensor from terminal THEC via resistor R.

The resistor R and the EGR gas temperature sensor are connected in series. When the resistance value of the EGR gas temperature sensor changes in accordance with changes in the exhaust gas recirculation gas temperature, the voltage at terminal THEC also changes.

The resistance is temperature dependent and varies between 138 kΩ and 127 Ω, which corresponds to a temperature of -50°C (-58°F) to 500°C (932°F) (See Fig. 1).

A004SONE01
*1 (Fig. 1)
*2 Resistance (Ω)
*3 Temperature (°C)
DTC No. DTC Detection Condition Trouble Area
P040C

EGR gas temperature sensor output voltage is 0.2 V or less for 0.6 seconds.

(3 trip detection logic)

  • Open or short in EGR gas temperature sensor circuit

  • EGR gas temperature sensor

  • ECM
DTC No. DTC Detection Condition Trouble Area
P040D

EGR gas temperature sensor output voltage is 4.98 V or more for 0.6 seconds.

(3 trip detection logic)

  • Open or short in EGR gas temperature sensor circuit

  • EGR gas temperature sensor

  • ECM
Related Data List
DTC No. Data List

P040C

P040D

 Temperature Down Stream of EGR Cooler

WIRING DIAGRAM

A004U59E05
*a THEC
*b ETEC
*c EGR Gas Temperature Sensor

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


    1. Disconnect the EGR 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
      B112-1 (THEC) - B91-118 (THEC) Always Below 1 Ω
      B112-2 (E2) - B91-86 (ETEC) Always Below 1 Ω
      B112-1 (THEC) or B91-118 (THEC) - Body ground Always 10 kΩ or higher

    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR Click here

    OK

  2. INSPECT EGR GAS TEMPERATURE SENSOR


    1. Inspect the EGR gas temperature sensor Click here.


    NG

    REPLACE EGR GAS TEMPERATURE SENSOR Click here

    OK

  3. REPLACE ECM


    1. Replace the ECM Click here.


    NEXT

    CONFIRM WHETHER MALFUNCTION HAS BEEN SUCCESSFULLY REPAIRED Click here

  4. REPAIR OR REPLACE HARNESS OR CONNECTOR


    1. Repair or replace the harness or connector.


    NEXT

    CONFIRM WHETHER MALFUNCTION HAS BEEN SUCCESSFULLY REPAIRED Click here

  5. REPLACE EGR GAS TEMPERATURE SENSOR


    1. Replace the EGR gas temperature sensor Click here.


    NEXT

  6. CONFIRM WHETHER MALFUNCTION HAS BEEN SUCCESSFULLY REPAIRED


    1. Connect the GTS to the DLC3.

    2. Turn the ignition switch to ON and turn the GTS on.

    3. Clear the DTCs Click here.

    4. Turn the ignition switch off and wait for 60 seconds or more [A].

    5. Perform road test [B].

    6. Repeat [A] and [B] for the number of trips detected.

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

    8. Confirm that the DTC is not output again.


    NEXT

    END