Code No. P0603: EEP ROM Malfunction

FUNCTION

• To check whether the information such as the idle learned value and so on is stored in the memory of engine-ECU.
  

TROUBLE JUDGMENT

• Ignition switch is in "ON" position.
  

• The latest learned data that was flashed while the ignition switch was in "OFF" position are not stored correctly.
  

PROBABLE CAUSE

• Failed engine-ECU
  

	Replace the engine-ECU then perform the variant coding (Refer to GROOP 00 - Precautions Before Service - How to Perform Variant Coding).

	Intermittent malfunction (Refer to GROUP 00 - How to Use Troubleshooting/Inspection Service Points - How to Cope with Intermittent Malfunctions ).