Code No. P0602: Variant Coding System


FUNCTION



  • The engine-ECU performs proper engine control based on vehicle information entered.
  • A vehicle identification number (VIN) is entered at a plant before shipment. This diagnosis code occurs when no vehicle information is entered during engine-ECU replacement.

TROUBLE JUDGMENT


Check Condition
  • Ignition switch is "ON" position.
Judgment Criterion
  • Vehicle information is not entered into the engine-ECU.


  • The tester write area of EEPROM is abnormal.

FAIL-SAFE AND BACKUP FUNCTION



  • None

PROBABLE CAUSE



  • Failed engine-ECU

DIAGNOSIS PROCEDURE

STEP 1. M.U.T.-III diagnosis code

  • Reconfirmation of diagnosis code.

Q. Is diagnosis code set?
Replace the engine-ECU with one into which vehicle information is correctly entered.
Intermittent malfunction (Refer to GROUP 00 - How to Use Troubleshooting/Inspection Service Points - How to Cope with Intermittent Malfunctions ).