Code No. P1497: DPF System Malfunction

FUNCTION

The engine-ECU monitors the input signals from sensors to check if the DPF regeneration is executed normally.

TROUBLE JUDGEMENT

Check Condition

On DPF regeneration

Judgement Criterion

The DPF regeneration status continues for the predetermined time or more.

FAIL-SAFE AND BACKUP FUNCTION

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

PROBABLE CAUSES

Failed No. 2 exhaust gas temperature sensor (catalyst temperature)
Failed No. 3 exhaust gas temperature sensor (DPF temperature)
Failed exhaust differential pressure sensor
Catalytic converter inactive
The engine oil-containing ash is loaded to the DPF inside.
The small injection quantity improperly learned

DIAGNOSIS PROCEDURE

STEP 1. M.U.T.-III data list.

Refer to Data List Reference Table .

Item 118: No. 2 exhaust gas temperature sensor (catalyst temperature)
Item 119: No. 3 exhaust gas temperature sensor (DPF temperature)
Item 120: Exhaust differential pressure sensor

Q. Are the check results normal?

	Go to Step 2.

	Perform the diagnosis code classified check procedure for the sensor that has shown an abnormal data value (Refer to Inspection Chart for Diagnosis Code ).

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

Item 208: Short interval DPF regeneration count

OK: 10 or more

Q. Is the short interval DPF regeneration counting 10 or more?

	Go to Step 4.

	Go to Step 3.

STEP 3. Forcible DPF regeneration execution

Initialise the DPF-related parts, and then delete the diagnosis code (Refer to GROUP 00 - Precautions before Service - Initialisation Procedure for Learning Value in Common Rail Engine <4N1> ).

Item 42: DPF system malfunction service

Carry out the forcible DPF regeneration (Refer to GROUP 17 - Diesel Particulate Filter (DPF) System - Forcible DPF Regeneration ).
Carry out the small injection quantity learning procedure (Refer to GROUP 00 - Precautions Before Service - Small Injection Quantity Learning Procedure ).

Q. Is diagnosis code P0420 or P1497 set?

	Replace the catalytic converter. When the catalytic converter is replaced, initialise the learning value (Refer to GROUP 00 - Precautions before Service - Initialisation Procedure for Learning Value in Common Rail Engine <4N1> ). On completion, carry out the forcible DPF regeneration (Refer to GROUP 17 - Diesel Particulate Filter (DPF) System - Forcible DPF Regeneration ).

Replace the engine-ECU. When the engine-ECU is replaced, write the chassis number (Refer to GROUP 00 - Precautions Before Service - How to Perform Chassis Number Writing). After replacing the engine-ECU, register the injector identification code and learn fuel injection (Refer to GROUP 00 - Precautions Before Service - What The Common Rail Engine Learns

). After registering the injector identification code, carry out the forcible DPF regeneration (Refer to GROUP 17 - Diesel Particulate Filter (DPF) System - Forcible DPF Regeneration

STEP 4. Forcible DPF regeneration execution

Initialise the DPF-related parts, and then delete the diagnosis code (Refer to GROUP 00 - Precautions before Service - Initialisation Procedure for Learning Value in Diesel Particulate Filter (DPF) System ).

Item 42: DPF system malfunction service

Carry out the forcible DPF regeneration 2 times (Refer to GROUP 17 - Diesel Particulate Filter (DPF) System - Forcible DPF Regeneration ).

note Carry out the DPF regeneration 2 times because the assumption of the accumulated amount of the DPF is not stable.
Carry out the small injection quantity learning procedure (Refer to GROUP 00 - Precautions Before Service - Small Injection Quantity Learning Procedure ).
M.U.T.-III data list

Item 156: Soot loading by differential pressure

OK: 3 g/L or less

Q. Is the check result normal?

	Proceed to troubleshooting for black smoke (Refer to Inspection Procedure 13 ).

	Replace the DPF. When the DPF is replaced, initialise the learning value (Refer to GROUP 00 - Precautions Before Service - Initialisation Procedure For Learning Value in Diesel Particulate Filter (DPF) System ).