DTC P1AA7: MASTER ECU Signal Time Out
caution | Whenever ECU is replaced, ensure that the CAN bus lines are normal. |
TROUBLE JUDGMENT
Check Condition
- The power supply mode of the electric motor switch is ON, or the main drive lithium-ion battery starts to be charged.
Judgment Criterion
- The signal sent by the PHEV-ECU through the CAN cannot be received.
FAIL-SAFE AND BACKUP FUNCTION
- When the backup communication is normal, use the backup communication data.
PROBABLE CAUSES
- The CAN bus is failed.
- The PHEV-ECU is failed.
- The battery management unit (BMU) is failed.