ECD SYSTEM (w/ DPF), 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 Diesel Particulate Filter (DPF), refer to the following procedures Click here.
If P2454 and/or P2455 is present, refer to the DTC chart for DPF system Click here.

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 stores DTC P2454 or P2455, and illuminates the MIL.

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	DPF Differential Pressure

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 (0 mmHg, 0 in.Hg)	Normal
Always	-5 kPa (-37.5 mmHg, -1.5 in.Hg) or less or higher than 99 kPa (743 mmHg, 29.2 in.Hg)	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

INSPECTION PROCEDURE

Note

Inspect the fuses of circuits related to this system before performing the following inspection procedure.
After replacing the ECM, the new ECM needs registration Click here and initialization Click here.
After replacing the fuel supply pump assembly or suction control valve, the ECM needs initialization Click here.
After replacing an injector assembly, the ECM needs registration Click here.

Tech Tips

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.

PROCEDURE

CHECK HARNESS AND CONNECTOR (DIFFERENTIAL PRESSURE SENSOR - ECM)

Disconnect the differential pressure sensor connector.
Disconnect the ECM connector.

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

Standard Resistance

Tester Connection	Condition	Specified Condition
D14-2 (PEX) - E12-7 (PEX)	Always	Below 1 Ω
D14-3 (VC) - E12-13 (VCPX)	Always	Below 1 Ω
D14-1 (E2) - E12-14 (EPEX)	Always	Below 1 Ω
D14-2 (PEX) or E12-7 (PEX) - Body ground	Always	10 kΩ or higher
D14-3 (VC) or E12-13 (VCPX) - Body ground	Always	10 kΩ or higher

REPAIR OR REPLACE HARNESS OR CONNECTOR Click here

CHECK TERMINAL VOLTAGE (VC VOLTAGE)

Text in Illustration

*a
Front view of wire harness connector

(to Differential Pressure Sensor)

Disconnect the differential pressure sensor connector.

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

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

Standard Voltage

Tester Connection	Switch Condition	Specified Condition
D14-3 (VC) - Body ground	Ignition switch ON	4.5 to 5.5 V

REPLACE ECM Click here

REPLACE DIFFERENTIAL PRESSURE SENSOR
1. Replace the differential pressure sensor Click here.
NEXT
CONFIRM WHETHER MALFUNCTION HAS BEEN SUCCESSFULLY REPAIRED Click here
REPLACE ECM
1. Replace the ECM Click here.
NEXT
CONFIRM WHETHER MALFUNCTION HAS BEEN SUCCESSFULLY REPAIRED Click here
REPAIR OR REPLACE HARNESS OR CONNECTOR
1. Repair or replace the harness or connector.
NEXT
CONFIRM WHETHER MALFUNCTION HAS BEEN SUCCESSFULLY REPAIRED
1. Connect the intelligent tester to the DLC3.
2. Turn the ignition switch to ON and turn the tester on.
3. Clear the DTCs Click here.
4. Turn the ignition switch to ON and wait for 5 seconds.
5. Enter the following menus: Powertrain / Engine and ECT / DTC.
6. Confirm that the DTC is not output again.
NEXT

END