DTC P2456:00 [PCM (SKYACTIV-D 2.2)]

DTC P2456:00	Exhaust gas pressure sensor No.2: Characteristic malfunction
DETECTION CONDITION	• When the following conditions are met, the PCM detects a difference of less than 0.1 kPa for a consecutive 8 times between the value detected by exhaust pressure sensor No.2 when the exhaust amount is 2.0 m³/min or more and the value detected by exhaust pressure sensor No.2 when the exhaust amount is less than 0.85 m³/min. ― Battery positive voltage: 8—16 V ― 0.5 s have elapsed after ignition is switched ON (engine on) ― The following DTCs are not detected • MAP sensor No.2: P0107:00, P0108:00 • BARO sensor: P2228:00, P2229:00 • MAF sensor: P0102:00, P0103:00 • EGR valve position sensor: P0405:00, P0406:00 • IAT sensor No.2: P1118:00, P1119:00 • Exhaust gas pressure sensor No.1: P0472:00, P0473:00 • Exhaust gas temperature sensor No.1: P0545:00, P0546:00 • Constant voltage power supply control system: P0642:00, P0643:00, P0652:00, P0653:00 • Exhaust gas pressure sensor No.2: P2454:00, P2455:00 • IAT sensor No.3: P242C:00, P242D: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/Snapshot data is available. • DTC is stored in the PCM memory.
FAIL-SAFE FUNCTION	• Limits engine torque. • Inhibits the automatic diesel particulate filter regeneration control. • Inhibits the manual diesel particulate filter regeneration control. • Inhibits the EGR control.
POSSIBLE CAUSE	• Exhaust gas pressure sensor No.2 connector or terminal malfunction • Pipe clogging or damage between exhaust sensor No.2 and catalytic converter • PCM connector or terminal malfunction • Exhaust gas pressure sensor No.2 malfunction • PCM malfunction
SYSTEM WIRING DIAGRAM	Not applicable

DTC P2456:00

Exhaust gas pressure sensor No.2: Characteristic malfunction

DETECTION CONDITION

• When the following conditions are met, the PCM detects a difference of less than 0.1 kPa for a consecutive 8 times between the value detected by exhaust pressure sensor No.2 when the exhaust amount is 2.0 m³/min or more and the value detected by exhaust pressure sensor No.2 when the exhaust amount is less than 0.85 m³/min.

― Battery positive voltage: 8—16 V

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

― The following DTCs are not detected

• MAP sensor No.2: P0107:00, P0108:00

• BARO sensor: P2228:00, P2229:00

• MAF sensor: P0102:00, P0103:00

• EGR valve position sensor: P0405:00, P0406:00

• IAT sensor No.2: P1118:00, P1119:00

• Exhaust gas pressure sensor No.1: P0472:00, P0473:00

• Exhaust gas temperature sensor No.1: P0545:00, P0546:00

• Constant voltage power supply control system: P0642:00, P0643:00, P0652:00, P0653:00

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

• IAT sensor No.3: P242C:00, P242D: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/Snapshot data is available.

• DTC is stored in the PCM memory.

FAIL-SAFE FUNCTION

• Limits engine torque.

• Inhibits the automatic diesel particulate filter regeneration control.

• Inhibits the manual diesel particulate filter regeneration control.

• Inhibits the EGR control.

POSSIBLE CAUSE

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

• Pipe clogging or damage between exhaust sensor No.2 and catalytic converter

• PCM connector or terminal malfunction

• Exhaust gas pressure sensor No.2 malfunction

• PCM malfunction

SYSTEM WIRING DIAGRAM

Not applicable

Step	Inspection	Results	Action
1	RECORD VEHICLE STATUS WHEN DTC WAS DETECTED TO UTILIZE WITH REPEATABILITY VERIFICATION Note • Recording can be facilitated using the screen capture function of the PC. • Record the freeze frame data/snap shot data.	—	Go to the next step.
2	INSPECT EXHAUST GAS PRESSURE SENSOR NO.2 CONNECTOR CONDITION • Switch the ignition OFF. • Disconnect the exhaust gas pressure sensor No.2 connector. • Inspect the connector engagement and connection condition, and inspect the terminals for damage, deformation, corrosion, or disconnection. • Is the connector normal?	Yes	Go to the next step.
No	Repair or replace the connector, then go to Step 6.
3	INSPECT EXHAUST GAS PRESSURE SENSOR NO.2-RELATED PIPING • Visually inspect the exhaust gas pressure No.2-related piping for clogging, damage, or less. • Is the exhaust gas pressure sensor No.2-related piping normal?	Yes	Go to the next step.
No	Repair or replace the malfunctioning location, then go to the next step.
4	INSPECT PCM CONNECTOR CONDITION • Switch the ignition OFF. • Disconnect the PCM connector. • Inspect the connector engagement and connection condition, and inspect the terminals for damage, deformation, corrosion, or disconnection. • Is the connector normal?	Yes	Go to the next step.
No	Repair or replace the connector, then go to Step 6.
5	INSPECT EXHAUST GAS PRESSURE SENSOR NO.2 • Reconnect all disconnected connectors and hoses. • Inspect exhaust gas pressure sensor No.2. • Is exhaust gas pressure sensor No.2 normal?	Yes	Go to the next step.
No	Replace exhaust gas pressure sensor No.2, then go to the next step.
6	VERIFY THAT REPAIRS HAVE BEEN COMPLETED • Reconnect all the disconnected connectors. • Refer to the [MEMORY CLEARING PROCEDURE] and clear the DTC. • Perform the following operation: 1. Start the engine. 2. Shift the selector lever to the N position. 3. Depress the accelerator and release it immediately when the engine speed is 3,000 rpm or more. 4. Idle the engine for 5 s or more. 5. Repeat Steps 3 and 4 operations above 10 times or more in succession. • Display the DTCs using the M-MDS. • Has DTC P2456:00 been recorded?	Yes	Repeat the inspection from Step 1. • If the malfunction recurs, replace the PCM, then go to the next step.
No	Go to the next step.
7	VERIFY OTHER DTCs • Has any other DTC or pending code been stored?	Yes	Repair the malfunctioning location according to the applicable DTC troubleshooting.
No	DTC troubleshooting completed.

Step

Inspection

Results

Action

RECORD VEHICLE STATUS WHEN DTC WAS DETECTED TO UTILIZE WITH REPEATABILITY VERIFICATION

Note

• Recording can be facilitated using the screen capture function of the PC.

• Record the freeze frame data/snap shot data.

—

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 the connector engagement and connection condition, and inspect the terminals for damage, deformation, corrosion, or disconnection.

• Is the connector normal?

Yes

Go to the next step.

Repair or replace the connector, then go to Step 6.

INSPECT EXHAUST GAS PRESSURE SENSOR NO.2-RELATED PIPING

• Visually inspect the exhaust gas pressure No.2-related piping for clogging, damage, or less.

• Is the exhaust gas pressure sensor No.2-related piping normal?

Yes

Go to the next step.

Repair or replace the malfunctioning location, then go to the next step.

INSPECT PCM CONNECTOR CONDITION

• Switch the ignition OFF.

• Disconnect the PCM connector.

• Inspect the connector engagement and connection condition, and inspect the terminals for damage, deformation, corrosion, or disconnection.

• Is the connector normal?

Yes

Go to the next step.

Repair or replace the connector, then go to Step 6.

INSPECT EXHAUST GAS PRESSURE SENSOR NO.2

• Reconnect all disconnected connectors and hoses.

• Inspect exhaust gas pressure sensor No.2.

• Is exhaust gas pressure sensor No.2 normal?

Yes

Go to the next step.

Replace exhaust gas pressure sensor No.2, then go to the next step.

VERIFY THAT REPAIRS HAVE BEEN COMPLETED

• Reconnect all the disconnected connectors.

• Refer to the [MEMORY CLEARING PROCEDURE] and clear the DTC.

• Perform the following operation:

1. Start the engine.

2. Shift the selector lever to the N position.

3. Depress the accelerator and release it immediately when the engine speed is 3,000 rpm or more.

4. Idle the engine for 5 s or more.

5. Repeat Steps 3 and 4 operations above 10 times or more in succession.

• Display the DTCs using the M-MDS.

• Has DTC P2456:00 been recorded?

Yes

Repeat the inspection from Step 1.

• If the malfunction recurs, replace the PCM, then go to the next step.

Go to the next step.

VERIFY OTHER DTCs

• Has any other DTC or pending code been stored?

Yes

Repair the malfunctioning location according to the applicable DTC troubleshooting.

DTC troubleshooting completed.