DTC    P2454    Diesel Particulate Filter Pressure Sensor "A" Circuit Low

DTC    P2455    Diesel Particulate Filter Pressure Sensor "A" Circuit High

for Preparation Click here


DESCRIPTION

The ECM compares the exhaust gas pressure before and after DPF* catalytic converter using the 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

P2454 
DTC Detection Drive Pattern
DTC Detection Condition
Trouble Area
Ignition switch ON for 2 seconds
Differential pressure sensor output voltage is 0.35 V or less.
(1 trip detection logic)
  1. Open or short in differential pressure sensor circuit
  2. Incorrect exhaust pipe air hose routing
  3. Differential pressure sensor
  4. ECM

P2455 
DTC Detection Drive Pattern
DTC Detection Condition
Trouble Area
Ignition switch ON for 2 seconds
Differential pressure sensor output voltage is 4.9 V or more.
(1 trip detection logic)
  1. Open or short in differential pressure sensor circuit
  2. Incorrect exhaust pipe air hose routing
  3. Differential pressure sensor
  4. ECM

Related Data List 
DTC No.
Data List
P2454
DPF Differential Pressure
P2455

HINT:
If the 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


A198999E03


INSPECTION PROCEDURE

NOTICE:
When replacing the ECM, the ECM needs Registration and Initialization (Click here).

HINT:
  1. When the ECM must be replaced, before replacing the ECM, perform the "Learning Values Save" function using the intelligent tester. Then after installing the new ECM, perform all of the initializations/registrations for the "Learning Values Write" function by following the instructions shown on the tester display.
  2. Read freeze frame data using the intelligent tester. 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.

1.READ VALUE USING INTELLIGENT TESTER (DPF DIFFERENTIAL PRESSURE)

  1. Connect the intelligent tester to the DLC3.

  1. Start the engine and turn the tester on.

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

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

  1. Read the value when depress and release the accelerator pedal.
    Result 
    Result
    		Condition
    		Proceed to
    -5 kPa
    		Always
    		A
    99 kPa or more
    		Always
    		B
    Between -4 to 98 kPa
    		Engine running
    depress and release accelerator pedal
    		C



B
Go to step 3

C
CHECK FOR INTERMITTENT PROBLEMS (Click here)
A


2.CHECK CONNECTION OF EXHAUST PIPE AIR HOSE (DIFFERENTIAL PRESSURE SENSOR - EXHAUST PIPE AIR HOSE)


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


    A200355E01

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

    OK:
    Exhaust pipe air hose routing is correct and there is no exhaust gas leak.



NG
Go to step 9
OK


3.CHECK BLOCKAGE OF EXHAUST PIPE AIR HOSE AND TRANSMITTING PIPE

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

  1. Disconnect the exhaust pipe air hose (both upstream and downstream) on the differential pressure sensor.

  1. Start the engine.

  1. Check if there are exhaust gas pulsations from both exhaust pipe air hoses during idling.



NG
Go to step 9
OK


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


    A199023E02

  1. Disconnect the differential pressure sensor connector.

  1. Disconnect the ECM connector.

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

    Standard Resistance (Check for Open):
    Tester Connection
    		Condition
    		Specified Condition
    A39-2 (PEX) - A19-32 (PEX)
    		Always
    		Below 1 Ω
    A39-3 (VC) - A19-33 (VCPX)
    		Always
    		Below 1 Ω
    A39-1 (E2) - A19-34 (EPEX)
    		Always
    		Below 1 Ω

    Standard Resistance (Check for Short):
    Tester Connection
    		Condition
    		Specified Condition
    A39-2 (PEX) or A19-32 (PEX) - Body ground
    		Always
    		10 kΩ or higher
    A39-3 (VC) or A19-33 (VCPX) - Body ground
    		Always
    		10 kΩ or higher
    A39-1 (E2) or A19-34 (EPEX) - Body ground
    		Always
    		10 kΩ or higher

    Text in Illustration 
    *1
    		Front view of wire harness connector
    (to Differential Pressure Sensor)
    *2
    		Front view of wire harness connector
    (to ECM)

  1. Reconnect the differential pressure sensor connector.

  1. Reconnect the ECM connector.



NG
Go to step 8
OK


5.REPLACE DIFFERENTIAL PRESSURE SENSOR

  1. Replace the differential pressure sensor (Click here).

  1. Start the engine and wait until the engine coolant temperature reaches 75°C (167°F) or more (A).

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

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

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


NEXT


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

  1. Connect the intelligent tester to the DLC3.

  1. Clear the DTCs (Click here).

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

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

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

  1. Read the DTCs.
    Result 
    Result
    		Proceed to
    DTC P2454 or P2455
    		A
    No DTC output
    		B



B
END
A


7.REPLACE ECM

  1. Replace the ECM (Click here).



NEXT
Go to step 10

8.REPAIR OR REPLACE HARNESS OR CONNECTOR


NEXT
Go to step 10

9.REPAIR OR REPLACE MALFUNCTIONING PARTS

NEXT


10.CONFIRM WHETHER MALFUNCTION HAS BEEN SUCCESSFULLY REPAIRED

  1. Connect the intelligent tester to the DLC3.

  1. Clear the DTCs (Click here).

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

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

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

  1. Confirm that the DTC is not output again.


NEXT

END