СИСТЕМА ECD, Diagnostic DTC:P2454, P2455

DTC Code DTC Name
P2454 Diesel Particulate Filter Pressure Sensor "A" Circuit Low
P2455 Diesel Particulate Filter Pressure Sensor "A" Circuit High

DESCRIPTION

Tech Tips


  • For more information on the differential pressure sensor and TOYOTA D-CAT*1, refer to the following procedures Click here.

  • If P2454 and/or P2455 is present, refer to the DTC chart for TOYOTA D-CAT Click here.


    • *1: Diesel Clean Advanced Technology

A01QUKCE14

The two sensing chambers of the differential pressure sensor are mounted to monitor the pressure before and after the DPNR*2 catalytic converter. The sensor itself is not located on the engine assembly in order to reduce the influence of vibration.

The ECM compares the exhaust gas pressure before and after the DPNR catalyst by monitoring the pressure using the upstream and downstream sensing chambers of the differential pressure sensor assembly. If the difference in pressure exceeds a predetermined level, the ECM judges that the catalytic converter is clogged with particulate matter (PM). When the ECM judges that a partially clogged condition exists, the ECM begins to perform PM forced regeneration.

When the output voltage of the sensor deviates from the normal operating range, the ECM interprets this as a malfunction of the sensor circuit, and stores DTC P2454 or P2455, and illuminates the MIL.

*2: Diesel Particulate-NOx Reduction system

Tech Tips

If the vacuum hoses of the differential pressure sensor are incorrectly connected (crossed), the ECM interprets this as an abnormal pressure difference, DTC P2453 (Diesel Particulate Filter Pressure Sensor "A" Circuit Range/Performance) is stored and the MIL illuminates.

DTC No. Detection Item DTC Detection Condition Trouble Area MIL Memory
P2454 Diesel Particulate Filter Pressure Sensor "A" Circuit Low

Differential pressure sensor output voltage is below 0.4 V for 3 seconds or more.

(1 trip detection logic)

  • Open or short in differential pressure sensor circuit

  • Incorrect differential pressure sensor hose routing

  • Differential pressure sensor

  • ECM

 Comes on DTC stored
P2455 Diesel Particulate Filter Pressure Sensor "A" Circuit High

Differential pressure sensor output voltage is higher than 4.8 V for 3 seconds or more.

(1 trip detection logic)

  • Open or short in differential pressure sensor circuit

  • Incorrect differential pressure sensor hose routing

  • Differential pressure sensor

  • ECM

 Comes on DTC stored
Related Data List
DTC No. Data List
P2454 DPF Differential Pressure
P2455

Tech Tips


  • DTC P2453 (Diesel Particulate Filter Pressure Sensor "A" Circuit Range / Performance) will be stored if there is incorrect vacuum hose routing to the differential pressure sensor.

  • After confirming DTC P2454 and P2455, check the differential pressure in the "Powertrain / Engine / Data List / DPF Differential Pressure" menu using the GTS.

Reference:
Condition Differential Pressure Output Sensor Condition
Ignition switch ON Approximately 0 kPa Normal
Always -5 kPa or less or higher than 99 kPa Open or short circuit
4000 rpm (No engine load) Negative output Incorrect hose routing

MONITOR DESCRIPTION

In order to detect abnormality in the differential pressure sensor, the ECM always monitors the output voltage from the sensor. When the sensor output voltage deviates from the normal operating range (between 0.4 V and 4.8 V) for more than 3 seconds, the ECM interprets this as a malfunction in the sensor circuit and illuminates the MIL.

CONFIRMATION DRIVING PATTERN

DTC No. DTC Detection Drive Pattern
P2454 Ignition switch ON for 5 seconds
P2455

WIRING DIAGRAM

A01QQTKE41
*a Differential Pressure Sensor

CAUTION / NOTICE / HINT

Note

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

PROCEDURE


  1. CHECK WIRE HARNESS (DIFFERENTIAL PRESSURE SENSOR ASSEMBLY - ECM)


    1. Disconnect the differential pressure sensor assembly 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
      B71-2 (PEX) - B76-98 (PEX) Always Below 1 Ω
      B71-3 (VC) - B76-93 (VCPM) Always Below 1 Ω
      B71-1 (E2) - B76-74 (EPEX) Always Below 1 Ω
      B71-2 (PEX) or B76-98 (PEX) - Body ground Always 10 kΩ or higher
      B71-3 (VC) or B76-93 (VCPM) - Body ground Always 10 kΩ or higher
      B71-1 (E2) or B76-74 (EPEX) - Body ground Always 10 kΩ or higher
      Result
      Proceed to
      OK
      NG

    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR Click here

    OK

  2. CHECK TERMINAL VOLTAGE (POWER SOURCE OF DIFFERENTIAL PRESSURE SENSOR ASSEMBLY)


    1. A01QTKTC06
      *a

      Front view of wire harness connector

      (to Differential Pressure Sensor Assembly)

      Disconnect the differential pressure sensor assembly connector.

    2. Turn the ignition switch to ON.

    3. Measure the voltage according to the value(s) in the table below.

      Standard Voltage
      Tester Connection Condition Specified Condition
      B71-3 (VC) - Body ground Ignition switch ON 4.5 to 5.5 V
      Result
      Proceed to
      OK
      NG

    NG

    REPLACE ECM Click here

    OK

  3. REPLACE DIFFERENTIAL PRESSURE SENSOR ASSEMBLY


    1. Replace the differential pressure sensor assembly.

      Click here

      Result
      Proceed to
      NEXT

    NEXT

    GO TO STEP 6 Click here

  4. REPLACE ECM


    1. Replace the ECM.

      Click here

      Result
      Proceed to
      NEXT

    NEXT

    GO TO STEP 6 Click here

  5. REPAIR OR REPLACE HARNESS OR CONNECTOR


    1. Repair or replace the harness or connector.

      Result
      Proceed to
      NEXT

    NEXT

  6. CONFIRM WHETHER MALFUNCTION HAS BEEN SUCCESSFULLY REPAIRED


    1. Connect the GTS to the DLC3.

    2. Turn the ignition switch to ON.

    3. Turn the GTS on.

    4. Clear the DTCs.


      Powertrain > Engine > Clear DTCs

    5. Turn the ignition switch to ON and wait for 5 seconds.

    6. Enter the following menus: Powertrain / Engine / Trouble Codes.


      Powertrain > Engine > Trouble Codes

    7. Confirm that the DTC is not output again.

      Result
      Proceed to
      NEXT

    NEXT

    END