ECD SYSTEM, 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

A010R8NE02

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 catalytic converter by monitoring the pressure using the upstream and downstream sensing chambers of the differential pressure sensor. 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 DPNR catalyst 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 sets 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.

P2454
DTC Detection Drive Pattern DTC Detection Condition Trouble Area
Ignition switch ON for 5 seconds

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
P2455
DTC Detection Drive Pattern DTC Detection Condition Trouble Area
Ignition switch ON for 5 seconds

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
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 and ECT / Data List / DPF Differential Pressure" menu using the intelligent tester.

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.

WIRING DIAGRAM

A010R42E07

INSPECTION PROCEDURE

Note

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

PROCEDURE


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


    1. A010SSZE15
      Text in Illustration
      *a

      Front view of wire harness connector

      (to Differential Pressure Sensor)
      *b

      Front view of wire harness connector

      (to ECM)

      Disconnect the differential pressure sensor connector.

    2. Disconnect the ECM connector.

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

      Standard Resistance (Check for Open)
      Tester Connection Condition Specified Condition
      B76-2 (PEX) - B39-98 (PEX) Always Below 1 Ω
      B76-3 (VC) - B39-75 (VCPX) Always Below 1 Ω
      B76-1 (E2) - B39-74 (EPEX) Always Below 1 Ω
      Standard Resistance (Check for Short)
      Tester Connection Condition Specified Condition
      B76-2 (PEX) or B39-98 (PEX) - Body ground Always 10 kΩ or higher
      B76-3 (VC) or B39-75 (VCPX) - Body ground Always 10 kΩ or higher
      B76-1 (E2) or B39-74 (EPEX) - Body ground Always 10 kΩ or higher

    4. Reconnect the differential pressure sensor connector.

    5. Reconnect the ECM connector.


    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR Click here

    OK

  2. CHECK TERMINAL VOLTAGE (VC)


    1. A010RHNE29
      Text in Illustration
      *a

      Front view of wire harness connector

      (to Differential Pressure Sensor)

      Disconnect the differential pressure sensor connector.

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

      Standard Voltage
      Tester Connection Switch Condition Specified Condition
      B76-3 (VC) - Body ground Ignition switch ON 4.5 to 5.5 V

    3. Reconnect the differential pressure sensor connector.


    NG

    REPLACE ECM Click here

    OK

  3. REPLACE DIFFERENTIAL PRESSURE SENSOR ASSEMBLY


    1. Replace the differential pressure sensor assembly Click here.


    NEXT

    CONFIRM WHETHER MALFUNCTION HAS BEEN SUCCESSFULLY REPAIRED Click here

  4. REPLACE ECM


    1. Replace the ECM Click here.


    NEXT

    CONFIRM WHETHER MALFUNCTION HAS BEEN SUCCESSFULLY REPAIRED Click here

  5. REPAIR OR REPLACE HARNESS OR CONNECTOR


    1. Repair or replace the harness or connector.


    NEXT

  6. CONFIRM WHETHER MALFUNCTION HAS BEEN SUCCESSFULLY REPAIRED


    1. Connect the intelligent tester to the DLC3.

    2. Clear the DTCs Click here.

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

    4. Enter the following menus: Powertrain / Engine and ECT / DTC.

    5. Confirm that the DTC is not output again.


    NEXT

    END