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DTC P1AA7: MASTER ECU Signal Time Out
 
 
cautionWhenever 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.
 
 
 
 
DIAGNOSIS
Erase the DTC.