Dtc P2454 Diesel Particulate Filter Pressure Sensor A Circuit Low


DESCRIPTION

MONITOR DESCRIPTION

WIRING DIAGRAM

INSPECTION PROCEDURE

CHECK TERMINAL VOLTAGE (POWER SOURCE OF DIFFERENTIAL PRESSURE SENSOR)

INSPECT DIFFERENTIAL PRESSURE SENSOR (PEX VOLTAGE)

CHECK WIRE HARNESS (DIFFERENTIAL PRESSURE SENSOR - ECM)

CHECK ECM (CHECK RESISTANCE)

REPLACE DIFFERENTIAL PRESSURE SENSOR

CHECK ECM (POWER SOURCE OF DIFFERENTIAL PRESSURE SENSOR)

REPLACE ECM

REPAIR OR REPLACE HARNESS OR CONNECTOR

CONFIRM WHETHER MALFUNCTION HAS BEEN SUCCESSFULLY REPAIRED

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

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


DESCRIPTION

HINT:
  1. For more information on the differential pressure sensor and Diesel Particulate Filter (DPF), refer to the following procedures (LandCruiser RM000000XSN04PX.html).
  2. If P2454 and/or P2455 is present, refer to the DTC chart for DPF system (LandCruiser RM000000XSN04PX.html).

Land Cruiser, Land Cruiser Prado. Grj150 Trj150,155 Kdj150,155 Lj150, Gdj150,155.1Gd-Ftv Engine Control.Ecd System. Dtc P2454 Diesel Particulate Filter Pressure Sensor A Circuit Low

The two sensing chambers of the differential pressure sensor are mounted to monitor the pressure before and after the DPF 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 DPF 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 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 sets DTC P2454 or P2455, and illuminates the MIL.

P2454
DTC Detection Drive Pattern
DTC Detection Condition
Trouble Area
Engine switch on (IG) for 5 seconds
Differential pressure sensor output voltage is below 0.4 V for 3 seconds or more.
(1 trip detection logic)
  1. Open or short in differential pressure sensor circuit
  2. Incorrect air hose routing
  3. Differential pressure sensor
  4. ECM

P2455
DTC Detection Drive Pattern
DTC Detection Condition
Trouble Area
Engine switch on (IG) for 5 seconds
Differential pressure sensor output voltage is higher than 4.8 V for 3 seconds or more.
(1 trip detection logic)
  1. Open or short in differential pressure sensor circuit
  2. Incorrect air hose routing
  3. Differential pressure sensor
  4. ECM

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

HINT:
  1. 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 assembly.
  2. After confirming DTC P2454 and P2455, check the differential pressure in the "Powertrain / Engine and ECT / Data List / DPF Differential Pressure" menu using the GTS.

Reference:
Condition
Differential Pressure Output
Sensor Condition
Engine switch on (IG)
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


Land Cruiser, Land Cruiser Prado. Grj150 Trj150,155 Kdj150,155 Lj150, Gdj150,155.1Gd-Ftv Engine Control.Ecd System. Dtc P2454 Diesel Particulate Filter Pressure Sensor A Circuit Low


INSPECTION PROCEDURE

NOTICE:
After replacing the ECM, the new ECM needs registration (LandCruiser RM0000012XK0AVX.html) and initialization (LandCruiser RM000000TIN08IX.html).
HINT:
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.
1.CHECK TERMINAL VOLTAGE (POWER SOURCE OF DIFFERENTIAL PRESSURE SENSOR)


    Land Cruiser, Land Cruiser Prado. Grj150 Trj150,155 Kdj150,155 Lj150, Gdj150,155.1Gd-Ftv Engine Control.Ecd System. Dtc P2454 Diesel Particulate Filter Pressure Sensor A Circuit Low

  1. Disconnect the differential pressure sensor connector.

  1. Turn the engine switch on (IG).

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

    Standard Voltage:
    Tester Connection
    		Switch Condition
    		Specified Condition
    C129-3 (VC) - C129-1 (E2)
    		Engine switch on (IG)
    		4.5 to 5.5 V
    Text in Illustration
    *a
    		Front view of wire harness connector
    (to Differential Pressure Sensor)

  1. Reconnect the differential pressure sensor connector.



NG
Go to step 6
OK


2.INSPECT DIFFERENTIAL PRESSURE SENSOR (PEX VOLTAGE)


    Land Cruiser, Land Cruiser Prado. Grj150 Trj150,155 Kdj150,155 Lj150, Gdj150,155.1Gd-Ftv Engine Control.Ecd System. Dtc P2454 Diesel Particulate Filter Pressure Sensor A Circuit Low

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

    Standard Resistance:
    Tester Connection
    		Condition
    		Specified Condition
    C151-27 (PEX) - C151-26 (EPEX)
    		Engine switch on (IG)
    		0.4 to 4.8 V
    Text in Illustration
    *a
    		Component with harness connected
    (ECM)


OK
Go to step 7
NG


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

  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:

    Tester Connection
    		Condition
    		Specified Condition
    C129-2 (PEX) - C151-27 (PEX)
    		Always
    		Below 1 Ω
    C129-3 (VC) - C151-32 (VCPX)
    		Always
    		Below 1 Ω
    C129-1 (E2) - C151-26 (EPEX)
    		Always
    		Below 1 Ω
    C129-2 (PEX) or C151-27 (PEX) - Body ground and other terminals
    		Always
    		10 kΩ or higher
    C129-3 (VC) or C151-32 (VCPX) - Body ground and other terminals
    		Always
    		10 kΩ or higher

  1. Reconnect the differential pressure sensor connector.

  1. Reconnect the ECM connector.



NG
Go to step 8
OK


4.CHECK ECM (CHECK RESISTANCE)


    Land Cruiser, Land Cruiser Prado. Grj150 Trj150,155 Kdj150,155 Lj150, Gdj150,155.1Gd-Ftv Engine Control.Ecd System. Dtc P2454 Diesel Particulate Filter Pressure Sensor A Circuit Low

  1. Disconnect the differential pressure sensor connector.

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

    Standard Voltage:
    Tester Connection
    		Switch Condition
    		Specified Condition
    C129-3 (VC) - C129-2 (PEX)
    		Engine switch off
    		No short or open circuit
    C129-2 (PEX) - C129-1 (E2)
    Text in Illustration
    *a
    		Front view of wire harness connector
    (to Differential Pressure Sensor)

  1. Reconnect the differential pressure sensor connector.



NG
Go to step 7
OK


5.REPLACE DIFFERENTIAL PRESSURE SENSOR

  1. Replace the differential pressure sensor (LandCruiser RM000005UKB000X.html).



NEXT
Go to step 9

6.CHECK ECM (POWER SOURCE OF DIFFERENTIAL PRESSURE SENSOR)


    Land Cruiser, Land Cruiser Prado. Grj150 Trj150,155 Kdj150,155 Lj150, Gdj150,155.1Gd-Ftv Engine Control.Ecd System. Dtc P2454 Diesel Particulate Filter Pressure Sensor A Circuit Low

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

    Standard Voltage:
    Tester Connection
    		Condition
    		Specified Condition
    C151-32 (VCPX) - C151-26 (EPEX)
    		Engine switch on (IG)
    		4.5 to 5.5 V
    Text in Illustration
    *a
    		Component with harness connected
    (ECM)


NG
Go to step 8
OK


7.REPLACE ECM

  1. Replace the ECM (LandCruiser RM0000013Z002DX.html).



NEXT
Go to step 9

8.REPAIR OR REPLACE HARNESS OR CONNECTOR

  1. Repair or replace the harness or connector.


NEXT


9.CONFIRM WHETHER MALFUNCTION HAS BEEN SUCCESSFULLY REPAIRED

  1. Connect the GTS to the DLC3.

  1. Clear the DTCs (LandCruiser RM000000PDK1ENX.html).

  1. Turn the engine switch on (IG) and wait for 5 seconds.

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

  1. Confirm that the DTC is not output again.


NEXT

END