ECD SYSTEM(w/o Glow Plug Controller), Diagnostic DTC:P2454 and P2455

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

DESCRIPTION

The ECM compares the exhaust gas pressure before and after the DPF* catalytic converter using a semiconductor-type differential pressure sensor.

If the differential pressure exceeds a predetermined level, the ECM judges that the catalytic converter has clogged with particulate matter (PM). At that time, the ECM begins to perform DPF catalyst regeneration.

*: Diesel Particulate Filter

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 0.35 V or less for 2 seconds.

(2 trip detection logic)

  • Open or short in differential pressure sensor circuit

  • Incorrect vacuum transmitting 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 4.9 V or higher for 2 seconds.

(2 trip detection logic)

  • Open or short in differential pressure sensor circuit

  • Incorrect vacuum transmitting hose routing

  • Differential pressure sensor

  • ECM

Comes on

DTC stored
Table 1. DTC Detection Drive Pattern

DTC No.

DTC Detection Drive Pattern

P2454

Ignition switch ON for 2 seconds

P2455
Table 2. Related Data List

DTC No.

Data List

P2454

DPF Differential Pressure

P2455
Tip:

If the DPF Differential Pressure outputs a negative value when the engine is maintained at an engine speed of 3000 rpm with no load, the hose and pipe connections may be incorrect.

WIRING DIAGRAM

A293483E04

CAUTION / NOTICE / HINT

Note:

When replacing the ECM, perform ECM Initialization and Registration.

Click hereClick here

Tip:

  • When the ECM must be replaced, before replacing the ECM, perform the "Learning Values Save" function using the GTS. Then after installing a new ECM, perform all of the initialization and registration procedures 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. READ VALUE USING GTS (DPF DIFFERENTIAL PRESSURE)

    1. Connect the GTS to the DLC3.

    2. Start the engine and turn the GTS on.

    3. Depress and release the accelerator pedal repeatedly several times.

    4. Enter the following menus: Powertrain / Engine and ECT / Data List / DPF Differential Pressure.

      Powertrain > Engine and ECT > Data List

      Tester Display

      DPF Differential Pressure

    5. Read the value when depress and release the accelerator pedal.

      Result

      Result

      Condition

      Proceed to

      -5 kPa

      Always

      A

      99 kPa or higher

      Always

      B

      Between -4 to 98 kPa

      Engine running

      depress and release accelerator pedal

      C
    B

    CHECK BLOCKAGE OF VACUUM TRANSMITTING HOSE AND TRANSMITTING PIPEClick here

    C

    CHECK FOR INTERMITTENT PROBLEMS

    Click here

    A

  2. CHECK CONNECTION OF VACUUM TRANSMITTING HOSE (DIFFERENTIAL PRESSURE SENSOR - VACUUM TRANSMITTING PIPE)

    1. Check if vacuum transmitting hoses routing between the differential pressure sensor and the vacuum transmitting pipe is correct.

      A294342C01

      *1

      Differential Pressure Sensor

      *2

      Vacuum Transmitting Hose (for upstream)

      *3

      No. 2 Vacuum Transmitting Hose (for downstream)

      -

      -

      *a

      Marked: Yellow

      *b

      Marked: Pink

      *c

      Marked: Red

      *d

      Marked: Orange

    2. Check that there is no exhaust gas leak between the differential pressure sensor and the vacuum transmitting pipe.

      OK

      The vacuum transmitting hoses routing is correct and there is no exhaust gas leak.

    Result

    Proceed to

    OK

    NG
    NG

    REPAIR OR REPLACE MALFUNCTIONING PARTSClick here

    OK

  3. CHECK BLOCKAGE OF VACUUM TRANSMITTING HOSE AND TRANSMITTING PIPE

    CAUTION:

    Be careful of being burned by exhaust gases during the following inspection.

    1. Disconnect both vacuum transmitting hoses (upstream and downstream) on the differential pressure sensor.

    2. Start the engine.

    3. Check if there are exhaust gas pulsations from both vacuum transmitting hoses during idling.

    Result

    Proceed to

    OK

    NG
    NG

    REPAIR OR REPLACE MALFUNCTIONING PARTSClick here

    OK

  4. CHECK HARNESS AND CONNECTOR (DIFFERENTIAL PRESSURE SENSOR - ECM)

    1. 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

      Tester Connection

      Condition

      Specified Condition

      B131-2 (PEX) - A101-32 (PEX)

      Always

      Below 1 Ω

      B131-3 (VC) - A101-33 (VCPX)

      Always

      Below 1 Ω

      B131-1 (E2) - A101-34 (EPEX)

      Always

      Below 1 Ω

      B131-2 (PEX) or A101-32 (PEX) - Body ground

      Always

      10 kΩ or higher

      B131-3 (VC) or A101-33 (VCPX) - Body ground

      Always

      10 kΩ or higher

      B131-1 (E2) or A101-34 (EPEX) - Body ground

      Always

      10 kΩ or higher

    Result

    Proceed to

    OK

    NG
    NG

    REPAIR OR REPLACE HARNESS OR CONNECTORClick here

    OK

  5. REPLACE DIFFERENTIAL PRESSURE SENSOR

    1. Replace the differential pressure sensor.

      Click hereClick here

    2. Start the engine and allow it to idle until the engine coolant temperature reaches 75°C (167°F) or higher (A).

    3. Turn the ignition switch off and wait for 30 seconds or more (B).

    4. Repeat the above procedures (A) and (B) 3 times.

      Tip:

      Procedures (A) and (B) must be repeated 3 times to complete the differential pressure sensor learning process.

    Result

    Proceed to

    NEXT
    NEXT

  6. CHECK WHETHER DTC OUTPUT RECURS (DTC P2454 OR P2455)

    1. Connect the GTS to the DLC3.

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

    3. Clear the DTCs.

      Powertrain > Engine and ECT > Clear DTCs

    4. Turn the ignition switch off and wait for 30 seconds or more.

    5. Turn the ignition switch to ON and wait for 10 seconds or more.

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

    7. Read the pending DTCs.

      Powertrain > Engine and ECT > Trouble Codes

      Result

      Result

      Proceed to

      DTC P2454 or P2455 is output

      A

      DTC is not output

      B
    B

    END

    A

  7. REPLACE ECM

    1. Replace the ECM.

      Click here

    Result

    Proceed to

    NEXT
    NEXT

  8. 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.

      Powertrain > Engine and ECT > Clear DTCs

    4. Turn the ignition switch off and wait for 30 seconds or more.

    5. Turn the ignition switch to ON and wait for 10 seconds or more.

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

    7. Confirm that the pending DTC is not output again.

      Powertrain > Engine and ECT > Trouble Codes

    Result

    Proceed to

    NEXT
    NEXT

    END

  9. REPAIR OR REPLACE HARNESS OR CONNECTOR

    Result

    Proceed to

    NEXT
    NEXT

    CONFIRM WHETHER MALFUNCTION HAS BEEN SUCCESSFULLY REPAIREDClick here

  10. REPAIR OR REPLACE MALFUNCTIONING PARTS

    Result

    Proceed to

    NEXT
    NEXT

    CONFIRM WHETHER MALFUNCTION HAS BEEN SUCCESSFULLY REPAIREDClick here