Code No. P2453: Exhaust Differential Pressure Sensor Range/Performance Problem <EURO5>

OPERATION

A power voltage of 5 V is applied to the exhaust differential pressure sensor power terminal from the engine-ECU DDP5 and earthed to the engine-ECU DDPE from the exhaust differential pressure sensor.
The sensor signal is inputted to the engine-ECU DDPS from the exhaust differential pressure sensor output terminal.

FUNCTION

The exhaust differential pressure sensor outputs the voltage to the engine-ECU in accordance with the difference in the voltage between the DPF upstream area and the DPF downstream area.
The engine-ECU anticipates the amount of PM accumulated in the DPF through this output voltage.

TROUBLE JUDGEMENT

Check Conditions

Battery positive voltage is 8 - 16 V
Vehicle in steady running.

Judgement Criterion

The exhaust differential pressure sensor output voltage is less than threshold value based on exhaust gas flow for predetermined time.

Check Conditions

Battery positive voltage is 8 - 16 V
Predetermined time has passed after the engine is stopped.
The malfunction of P2454 or P2455 is not detected.

Judgement Criterion

The exhaust differential pressure sensor output is more than 2.75 kPa for predetermined time.

or

The exhaust differential pressure sensor output is less than -2.75 kPa for predetermined time.

FAIL-SAFE AND BACKUP FUNCTION

The DPF regeneration is prohibited.
The EGR control is stopped (fully closed).
The throttle valve is opened (Electrical discontinuity).

PROBABLE CAUSES

The exhaust pressure hose or the exhaust pressure pipe is disconnected, damaged, misconnected or clogged.
Failed exhaust differential pressure sensor
Harness damage in exhaust differential pressure sensor circuit or loose connector contact
Failed engine-ECU

DIAGNOSIS PROCEDURE

STEP 1. Check exhaust pressure hose and exhaust pressure pipe.

Check the lines between the exhaust differential pressure sensor and the exhaust centre pipe (DPF) (i.e, exhaust pressure hose and exhaust pressure pipe) for disconnection, damage, wrong connection or clogging.

Q. Are the check results normal?

	Go to Step 2.

	Repair or replace the exhaust pressure hose or exhaust pressure pipe.

STEP 2. M.U.T.-III data list

Refer to Data List Reference Table .

Item 120: Exhaust differential pressure sensor

Q. Is the check result normal?

	Intermittent malfunction (Refer to GROUP 00 - How to Use Troubleshooting/Inspection Service Points - How to Cope with Intermittent Malfunctions).

	Go to Step 3.

STEP 3. Check harness between exhaust differential pressure (terminal No. 3) sensor connector and engine-ECU connector DDP5.

Check power supply line for damage.

Q. Is the check result normal?

	Go to Step 4.

	Repair the damaged harness wire.

STEP 4. Check harness between exhaust differential pressure sensor connector (terminal No. 1) and engine-ECU connector terminal DDPS.

Check output line for damage.

Q. Is the check result normal?

	Go to Step 5.

	Repair the damaged harness wire.

STEP 5. Check harness between exhaust differential pressure sensor connector (terminal No. 2) and engine-ECU connector terminal DDPE.

Check earthing line for damage.

Q. Is the check result normal?

	Go to Step 6.

	Repair the damaged harness wire.

STEP 6. Replace the exhaust differential pressure sensor

After replacing the exhaust differential pressure sensor, carry out the forcible DPF regeneration. [Refer to GROUP 17 - Emission Control <DIESEL> - Diesel Particulate Filter (DPF) System <4N1-EURO5> - Forcible DPF Regeneration ]. After carrying out the forcible DPF regeneration, re-check the trouble symptoms.

Q. Is the check result normal?

	Check end.

	Replace the engine-ECU.