DTC P1471 Diesel Particulate Defuser (DPD) Insufficient Regeneration (4JJ3 with DPD)

Note

If there is a problem with the MAF sensor, this DTC is set. Refer to DTC P0101 to diagnose the MAF sensor. Use the scan tool data list or scan tool data from a normal vehicle to determine nominal values.

1. Engine control system check

Refer to "51.Engine Control 1A.Troubleshooting(4JJ3 with DPD) Diagnostic system check-engine controls".

2. Prioritized DTC check

1) Connect the scan tool.

2) Turn OFF the ignition switch for 1 minute or more.

3) Turn ON the ignition switch.

4) Observe the DTC information with a scan tool. Is DTC P0426, P0427, P0428, P2002, P2453, P2454, P2455, or P2456 set at the same time?

Yes

Go to the applicable DTC diagnosis.

Refer to "51.Engine Control 1A.Troubleshooting(4JJ3 with DPD) DTC P0426 Exhaust Gas Temperature (EGT) Sensor 1 Circuit Range/Performance".

Refer to "51.Engine Control 1A.Troubleshooting(4JJ3 with DPD) DTC P0427 Exhaust Gas Temperature (EGT) Sensor 1 Circuit Low".

Refer to "51.Engine Control 1A.Troubleshooting(4JJ3 with DPD) DTC P0428 Exhaust Gas Temperature (EGT) Sensor 1 Circuit High".

Refer to "51.Engine Control 1A.Troubleshooting(4JJ3 with DPD) DTC P2002 Particulate Trap Efficiency Below Threshold".

Refer to "51.Engine Control 1A.Troubleshooting(4JJ3 with DPD) DTC P2453 Differential Pressure Sensor Circuit Range/Performance".

Refer to "51.Engine Control 1A.Troubleshooting(4JJ3 with DPD) DTC P2454 Differential Pressure Sensor Circuit Low".

Refer to "51.Engine Control 1A.Troubleshooting(4JJ3 with DPD) DTC P2455 Differential Pressure Sensor Circuit High".

Refer to "51.Engine Control 1A.Troubleshooting(4JJ3 with DPD) DTC P2456 Differential Pressure Sensor Learned Position".

=>Go to DPD components inspection.

3. DPD components inspection

1) Inspect the exhaust differential pressure sensor for the following. Is the result normal?

Incorrect piping or disconnection of the differential pressure hose or pipe
Clogging, collapsing, or twisting of the differential pressure hose or pipe
Exhaust differential pressure sensor damage
Dirt or foreign material blocking the inlet of the exhaust differential pressure sensor
Misdetection or delayed response of the exhaust differential pressure sensor

Note

The installation direction of the differential pressure hose is predetermined.

Refer to "1.Engine 1Z.Engine Electrical Control(4JJ3 with DPD) exhaust differential pressure sensor removal".

2) Inspect the air intake/exhaust system for the following. Is the result normal?

Missing or damaged exhaust system gasket
Exhaust gas leakage from the exhaust pipe, gasket, DPD body, exhaust gas temperature sensor, or differential pressure hose or pipe
Exhaust system modification
Misdetection or delayed response of the exhaust gas temperature sensor
Clogged air cleaner element, collapsing of the air piping between the air cleaner and the intake manifold, or a state where flow is restricted or damage is present
Air intake system modification
Leakage in the air intake system
Dirt or foreign material blocking the inlet of the MAF sensor
Misdetection or delayed response of the MAF sensor

3) Are all of the results normal?

Yes

=>Go to DPD status verification.

Repair or replace as necessary.

Note

If the exhaust differential pressure sensor is replaced, learning must be performed.

Refer to "1.Engine 1Z.Engine Electrical Control(4JJ3 with DPD) exhaust differential pressure sensor installation".

=>Go to DPD Forced Regeneration.

4. DPD status verification

1) Observe the DPD PM Storage Status parameter and the DPD Distance Status parameter on the scan tool. Does it apply to the C or D area in the DPD status table?

Refer to "51.Engine Control 1A.Troubleshooting(4JJ3 with DPD) DPD control system check".

Yes

=>Go to DPD Forced Slow Regeneration.

=>Go to DPD Forced Regeneration.

5. DPD Forced Slow Regeneration

1) Turn ON the ignition switch.

2) If a DTC is set, clear the DTC with a scan tool.

3) Turn OFF the ignition switch for 1 minute or more.

4) Perform the DPD Slow Regeneration with a scan tool.

Caution

To prevent heat from accumulating in the underfloor, perform work in a well-ventilated area or use an electric fan, etc., to blow air into the underfloor.
Open the engine hood to allow heat to leave the engine room.
After completing DPD Slow Regeneration, do not turn OFF the engine immediately. Idle the engine for at least 15 minutes and then turn OFF the engine.
After completing the DPD Slow Regeneration, do not continue to perform regeneration. Wait at least 30 minutes.
After completing the DPD Slow Regeneration, be sure to replace the engine oil.

Procedure completion

=>Go to DPD exhaust differential pressure check.

6. DPD Forced Regeneration

1) Perform the clearing of the DTC and DPD Regeneration Data Reset with a scan tool.

Refer to "1.Engine 1G.Exhaust(4JJ3 with DPD) DPD installation".

2) Turn OFF the ignition switch for 1 minute or more.

3) Perform DPD Forced Regeneration with a scan tool.

Procedure completion

=>Go to DPD exhaust differential pressure check.

7. DPD exhaust differential pressure check

1) Perform Exhaust Differential Pressure Sensor Learning.

Refer to "1.Engine 1G.Exhaust(4JJ3 with DPD) DPD installation".

2) Observe the Exhaust Gas Temperature 1 parameter on the scan tool.

Value: 170 ℃ { 338 °F }

3) If the reading is more than the specified value, run the engine at 1,500 rpm with no load until the temperature is lowered to reach the specified value.

4) Observe the Exhaust Differential Pressure parameter when the Exhaust Gas Temperature 1 parameter reaches the specified value with the accelerator pedal fully depressed. Is the Exhaust differential pressure parameter less than or equal to the specified value?

Value: 190 ℃ { 374 °F } Exhaust Gas Temperature 1

Value: 16.0 kPa { 2.3 psi } Exhaust Differential Pressure

Yes

Observe the DTC information with a scan tool.

Replace the DPD.

Note

If a DTC is set, clear the DTC with a scan tool.

Refer to "1.Engine 1G.Exhaust(4JJ3 with DPD) DPD removal".

Refer to "1.Engine 1G.Exhaust(4JJ3 with DPD) DPD installation".