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.