Code No. P1625: Injection Quantity Compensation Value Error


FUNCTION



  • Correction data of the injector built in the engine is written to the engine-ECU.
  • The engine-ECU checks whether the correction data thus written is valid.

TROUBLE JUDGMENT


Check Condition
  • Ignition switch is in "ON" position.
Judgment Criterion
  • An error is detected during three-side majority decision check or upper/lower limit check of an injector correction value.

FAIL-SAFE AND BACKUP FUNCTION



  • The rail pressure is controlled in the range between 50 and 100 MPa.
  • The fuel injection amount is restricted (Output restriction).
  • The open angle of the accelerator pedal is restricted.
  • The EGR control is stopped (fully closed).
  • The DPF regeneration is prohibited.
  • The throttle valve is opened (Electrical discontinuity).
  • The AS&G control is prohibited.

PROBABLE CAUSE



  • Failed engine-ECU

DIAGNOSIS PROCEDURE

STEP 1. Injector identification code data check

  • Check whether injector identification code data is correctly written to the engine-ECU in M.U.T.-III.

Q. Is the check result normal?
Replace the engine-ECU.
Go to Step 2.

STEP 2. Rewrite the injector identification code data again.

  • Rewrite the injector identification code data (Refer to GROUP 00 - Precautions Before Service - Injector Identification Code Registration Procedure <4N1> ).
  • After rewriting the injector identification code data again, recheck for abnormal symptoms.

Q. Does the trouble symptom persist?
Replace the engine-ECU.
The check is end.