Before troubleshooting the engine-ECU, check whether the diagnosis code is stored in the PHEV-ECU. If the PHEV-ECU has stored the diagnosis code, troubleshoot the stored diagnosis code.
After troubleshooting the engine-ECU, check that the diagnosis code regarding the engine-ECU is not stored in the PHEV-ECU. If the diagnosis code is stored, delete the diagnosis code.
Troubleshoot the engine-ECU according the troubleshooting procedures. (Refer to GROUP 00 - How to Use Troubleshooting/Inspection Service Points - Contents of Troubleshooting <PHEV> ).