Code No. P1A3E: CPU ambient temperature high abnormality (MCU)




DIAGNOSIS CODE SET CONDITIONS




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.
(3)Check if the diagnosis code is set.

Q. Is the diagnosis code set?

Return to Step 1.
The diagnosis is complete.