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 JUDGMENT


Check Condition
  • On DPF regeneration
Judgement Criterion
  • The No. 3 exhaust gas temperature sensor (DPF temperature) detects the abnormally high temperature.


  • 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.
  • The AS&G control is prohibited.

PROBABLE CAUSE



  • Damage by the DPF with high temperature

DIAGNOSIS PROCEDURE

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

  • Refer to Data List Reference Table .

  1. 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> ).
Perform the diagnosis code classified check procedure for the sensor that has shown an abnormal data value (Refer to Inspection Chart for Diagnosis Code ).