DTC P2456:00 [SKYACTIV-D 2.2]

id0102s4154000

DTC P2456:00

Characteristic malfunction in exhaust gas pressure sensor No.2

DETECTION CONDITION

•  When the following conditions are met, a difference in the pressure before and after passing the diesel particulate filter of less than 0.1 kPa {0.001 kgf/cm², 0.01 psi} is detected for 16 times:

MONITORING CONDITIONS

―  Battery voltage: 8—20 V

―  During engine running

―  Amount of exhaust gas: 2.0 m³/min or more, or 0.85 m³/min or less

Diagnostic support note

•  This is a continuous monitor (CCM).

•  The check engine light illuminates if the PCM detects the above malfunction condition during the first drive cycle.

•  FREEZE FRAME DATA (Mode 2)/Snapshot data is available.

•  DTC is stored in the PCM memory.

FAIL-SAFE FUNCTION

•  PCM restricts engine torque.

•  Inhibits the EGR control.

•  Inhibits the diesel particulate filter regeneration control.

•  Inhibits engine-stop by operating the i-stop function.

•  PCM restricts engine-transaxle integration control.

POSSIBLE CAUSE

•  Exhaust gas pressure sensor No.2 connector or terminals malfunction

•  Pipe between exhaust gas pressure sensor No.2 and catalytic converter restriction and/or damaged

•  PCM connector or terminals malfunction

•  PCM malfunction

SYSTEM WIRING DIAGRAM

Not applicable

DTC P2456:00	Characteristic malfunction in exhaust gas pressure sensor No.2
DETECTION CONDITION	• When the following conditions are met, a difference in the pressure before and after passing the diesel particulate filter of less than 0.1 kPa {0.001 kgf/cm², 0.01 psi} is detected for 16 times: MONITORING CONDITIONS ― Battery voltage: 8—20 V ― During engine running ― Amount of exhaust gas: 2.0 m³/min or more, or 0.85 m³/min or less Diagnostic support note • This is a continuous monitor (CCM). • The check engine light illuminates if the PCM detects the above malfunction condition during the first drive cycle. • FREEZE FRAME DATA (Mode 2)/Snapshot data is available. • DTC is stored in the PCM memory.
FAIL-SAFE FUNCTION	• PCM restricts engine torque. • Inhibits the EGR control. • Inhibits the diesel particulate filter regeneration control. • Inhibits engine-stop by operating the i-stop function. • PCM restricts engine-transaxle integration control.
POSSIBLE CAUSE	• Exhaust gas pressure sensor No.2 connector or terminals malfunction • Pipe between exhaust gas pressure sensor No.2 and catalytic converter restriction and/or damaged • PCM connector or terminals malfunction • PCM malfunction
SYSTEM WIRING DIAGRAM	Not applicable

Diagnostic Procedure

STEP	INSPECTION		ACTION
1	VERIFY FREEZE FRAME DATA (MODE 2)/SNAPSHOT DATA HAS BEEN RECORDED • Has the FREEZE FRAME DATA (Mode 2)/snapshot data been recorded?	Yes	Go to the next step.
1		No	Record the FREEZE FRAME DATA (Mode 2)/snapshot data on the repair order, then go to the next step.
2	VERIFY RELATED SERVICE INFORMATION AVAILABILITY • Verify related Service Information availability. • Is any related Service Information available?	Yes	Perform repair or diagnosis according to the available Service Information. • If the vehicle is not repaired, go to the next step.
2		No	Go to the next step.
3	VERIFY RELATED PENDING CODE AND/OR DTC • Switch the ignition off, then ON (engine off). • Perform the Pending Trouble Code Access Procedure and DTC Reading Procedure. (See ON-BOARD DIAGNOSTIC TEST [SKYACTIV-D 2.2].) • Are any other PENDING CODEs and/or DTCs present?	Yes	Go to the applicable PENDING CODE or DTC inspection. (See DTC TABLE [SKYACTIV-D 2.2].)
3		No	Go to the next step.
4	INSPECT EXHAUST GAS PRESSURE SENSOR NO.2 CONNECTOR CONDITION • Switch the ignition off. • Disconnect the exhaust gas pressure sensor No.2 connector. • Inspect for poor connection (such as damaged/pulled-out pins, corrosion). • Is there any malfunction?	Yes	Repair or replace the connector and/or terminals, then go to Step 7.
4		No	Go to the next step.
5	INSPECT EXHAUST GAS PRESSURE SENSOR NO.2 RELATED PIPE • Visually inspect the exhaust gas pressure sensor No.2 related pipe for restriction and damaged. (See EXHAUST GAS PRESSURE SENSOR INSPECTION [SKYACTIV-D 2.2].) • Is there any malfunction?	Yes	Repair or replace the malfunctioning part according to the inspection results, then go to Step 7.
5		No	Go to the next step.
6	INSPECT PCM CONNECTOR CONDITION • Disconnect the PCM connector. • Inspect for poor connection (such as damaged/pulled-out pins, corrosion). • Is there any malfunction?	Yes	Repair or replace the connector and/or terminals, then go to the next step.
6		No	Go to the next step.
7	VERIFY DTC TROUBLESHOOTING COMPLETED • Always reconnect all disconnected connectors. • Clear the DTC from the PCM memory using the M-MDS. (See AFTER REPAIR PROCEDURE [SKYACTIV-D 2.2].) • Perform the Drive Mode Type A. (See OBD DRIVE MODE [SKYACTIV-D 2.2].) • Perform the DTC Reading Procedure. (See ON-BOARD DIAGNOSTIC TEST [SKYACTIV-D 2.2].) • Is the same DTC present?	Yes	Repeat the inspection from Step 1. • If the malfunction recurs, replace the PCM. (See PCM REMOVAL/INSTALLATION [SKYACTIV-D 2.2].) Go to the next step.
7		No	Go to the next step.
8	VERIFY AFTER REPAIR PROCEDURE • Perform the “AFTER REPAIR PROCEDURE”. (See AFTER REPAIR PROCEDURE [SKYACTIV-D 2.2].) • Are any DTCs present?	Yes	Go to the applicable DTC inspection. (See DTC TABLE [SKYACTIV-D 2.2].)
8		No	DTC troubleshooting completed.