Code No. P1499: Abnormally high DPF temperature

FUNCTION

The DPF may be have melting damage if the temperature exceeds the specified value.
The engine-ECU monitors the signals from No. 3 exhaust gas temperature sensor (DPF temperature) to check if the DPF is under the specified temperature.

TROUBLE JUDGEMENT

Check Condition

On DPF regeneration

Judgement Criterion

The No. 3 exhaust gas temperature sensor (DPF temperature) detects the abnormally high temperature.

or

The estimated DPF centre temperature exceeds the specified value.

FAIL-SAFE AND BACKUP FUNCTION

The throttle valve is opened. (Electrical discontinuity)
The EGR control is stopped (fully closed).
The DPF regeneration is prohibited.
The fuel injection amount is restricted. (output restriction)
The open angle of the accelerator pedal is restricted.

PROBABLE CAUSE

Damage by the DPF with high temperature
Failed small injection quantity learning.

DIAGNOSIS PROCEDURE

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

Refer to Data List Reference Table .

Item 119: No. 3 exhaust gas temperature sensor (DPF temperature)

Q. Is the check result normal?

	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 Common Rail Engine <4N1> ).

	Go to Step 2.

STEP 2. Small injection quantity learning.

Carry out the small injection quantity learning procedure (Refer to GROUP 00 - Precautions Before Service - Small Injection Quantity Learning Procedure ).

Q. Is the diagnosis code set?

	Inspection chart for diagnosis code (Refer to ).

	The procedure is complete.