Code No. P1A3E: CPU ambient temperature high abnormality (MCU)
DIAGNOSIS CODE SET CONDITIONS
If the MCU board ambient temperature is kept at 85°C or more when the electric motor switch is set to the ON position, the MCU will set the diagnosis code No. P1A3E.
PROBABLE CAUSES
Malfunction of the MCU
Malfunction of the cooling system
DIAGNOSIS PROCEDURE
STEP 1. M.U.T.-III Diagnosis code of other systems
Check if the diagnosis code for the cooling system is set to the EV-ECU.
Q.
Is the diagnosis code set?
Carry out troubleshooting for the EV-ECU. (Refer to .) Then go to Step 2.
Go to Step 2.
STEP 2. Diagnosis code recheck
Check again if the diagnosis code is set to the MCU.
(1)Erase the stored diagnosis code.
(2)Set the electric motor switch from the LOCK (OFF) position to the ON position.
(3)Check if the diagnosis code is set.
Q.
Are all the check results normal?
Replace the MCU. (Refer to .) Then go to Step 3.
Intermittent malfunction (Refer to GROUP 00 - How to Use Troubleshooting/Inspection Service Points - How to Cope with Intermittent Malfunction .)
STEP 3. Diagnosis code recheck
Check again if the diagnosis code is set to the MCU.
(1)Erase the stored diagnosis code.
(2)Set the electric motor switch from the LOCK (OFF) position to the ON position.
Carry out troubleshooting for the EV-ECU. (Refer to 
.) Then go to Step 2.
Go to Step 2.