ECD SYSTEM, Diagnostic DTC:P1423

DTC Code DTC Name
P1423 Exhaust Temperature Sensor Upstream of Particulate Filter

DESCRIPTION

The exhaust gas temperature sensors are installed before and after 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 greater 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 (for sensor 1) and THCO (for 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 (for sensor 1) and THCO (for sensor 2) also changes.

DTC No. DTC Detection Condition Trouble Area
P1423

When the ambient temperature is the standard value or higher during a cold start, the exhaust gas temperature (for sensor 2) is not valid compared to the exhaust gas temperature (for sensor 1) for 0.05 seconds.

(3 trip detection logic)

 Exhaust gas temperature sensor (for sensor 2)
Related Data List
DTC No. Data List
P1423

  • Exhaust Temperature B1S1

  • Exhaust Temperature B1S2

WIRING DIAGRAM

A004NN7E11
*a Exhaust Gas Temperature Sensor (for Sensor 2)

CAUTION / NOTICE / HINT

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. REPLACE EXHAUST GAS TEMPERATURE SENSOR (FOR SENSOR 2)


    1. Replace the exhaust gas temperature sensor (for sensor 2) Click here.


    NEXT

  2. 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