DTC P2456:00 [SKYACTIV-D 2.2]

DTC P2456:00	Characteristic malfunction in exhaust gas pressure sensor No.2
DETECTION CONDITION	• With the following conditions met, a condition has continued while the crankshaft rotates eight times in which the difference in diesel particulate filter pressure between that of when the exhaust gas amount is 2.0 m³/min or more and that of when the exhaust gas amount is less than 0.85 m³/min is less than 0.1 kPa {0.001 kgf/cm², 0.01 psi}. MONITORING CONDITIONS ― Battery voltage: 8—20 V ― 0.5 s have elapsed after the ignition was switched ON (engine on) ― The following DTCs are not detected: • MAF sensor: P0102:00, P0103:00 • Exhaust gas pressure sensor No.2: P2454:00, P2455:00 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

• With the following conditions met, a condition has continued while the crankshaft rotates eight times in which the difference in diesel particulate filter pressure between that of when the exhaust gas amount is 2.0 m³/min or more and that of when the exhaust gas amount is less than 0.85 m³/min is less than 0.1 kPa {0.001 kgf/cm², 0.01 psi}.

MONITORING CONDITIONS

― Battery voltage: 8—20 V

― 0.5 s have elapsed after the ignition was switched ON (engine on)

― The following DTCs are not detected:

• MAF sensor: P0102:00, P0103:00

• Exhaust gas pressure sensor No.2: P2454:00, P2455:00

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

Item	Definition	Unit	Condition/Specification
EXH_FL	Exhaust gas amount	m³/min	• Displays exhaust gas amount
EXHP_DIF_AVE	Average value of the pressure difference before and after passing through the diesel particulate filter	KPa {MPa}, mBar {Bar}, psi, in H20	• Display average value of the pressure difference before and after passing through the diesel particulate filter
PM_GEN	PM generation amount	—(g/l, lb/ft3)	• Displays the PM generation amount

Item

Definition

Unit

Condition/Specification

EXH_FL

Exhaust gas amount

m³/min

• Displays exhaust gas amount

EXHP_DIF_AVE

Average value of the pressure difference before and after passing through the diesel particulate filter

KPa {MPa}, mBar {Bar}, psi, in H20

• Display average value of the pressure difference before and after passing through the diesel particulate filter

PM_GEN

PM generation amount

—(g/l, lb/ft3)

• Displays the PM generation amount

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.
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.
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].)
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.
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.
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.
No	Go to the next step.
7	PURPOSE: VERIFICATION OF VEHICLE REPAIR COMPLETION • Reconnect all disconnected connectors and hoses. • Clear the DTC from the PCM memory using the M-MDS. (See CLEARING DTC [SKYACTIV-D 2.2].) Note • If the repeatability verification procedure is to be implemented, the vehicle will need to be driven for approx. 100 km {62 mile}. Therefore, verify in advance that the repairs have been completed correctly using the repair completion verification procedure. • Verify that repairs have been completed. (See VERIFY TROUBLESHOOTING COMPLETED.) • Are the PIDs EXP_DIF_AVE, EXH_FL, and PM_GEN the standard or more?	Yes	Go to the next step.
No	Implement the repair completion verification procedure again. • If a malfunction occurs, perform the inspection from Step 1. ― If the malfunction is not resolved, replace the catalytic converter.
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].)
No	DTC troubleshooting completed.

STEP

INSPECTION

ACTION

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.

Record the FREEZE FRAME DATA (Mode 2)/snapshot data on the repair order, then go to the next step.

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.

Go to the next step.

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].)

Go to the next step.

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.

Go to the next step.

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.

Go to the next step.

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.

Go to the next step.

PURPOSE: VERIFICATION OF VEHICLE REPAIR COMPLETION

• Reconnect all disconnected connectors and hoses.

• Clear the DTC from the PCM memory using the M-MDS.

(See CLEARING DTC [SKYACTIV-D 2.2].)

Note

• If the repeatability verification procedure is to be implemented, the vehicle will need to be driven for approx. 100 km {62 mile}. Therefore, verify in advance that the repairs have been completed correctly using the repair completion verification procedure.

• Verify that repairs have been completed.

(See VERIFY TROUBLESHOOTING COMPLETED.)

• Are the PIDs EXP_DIF_AVE, EXH_FL, and PM_GEN the standard or more?

Yes

Go to the next step.

Implement the repair completion verification procedure again.

• If a malfunction occurs, perform the inspection from Step 1.

― If the malfunction is not resolved, replace the catalytic converter.

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].)

DTC troubleshooting completed.