Code No. P1A2A: IGBT overcurrent (MCU)


caution If there is any problem in the CAN bus lines, an incorrect diagnosis code may be set. Prior to this diagnosis, always diagnose the CAN bus lines.

OPERATION



  • MCU communicates with the EV-ECU via CAN.

DIAGNOSIS CODE SET CONDITIONS



  • When the diagnosis code No. P1A2A is set to the MCU, the diagnosis code No. P1A2A will be set.

PROBABLE CAUSES



  • Malfunction of the MCU IGBT system

DIAGNOSIS PROCEDURE

STEP 1. M.U.T.-III CAN bus diagnosis
Use the M.U.T.-III to diagnose the CAN bus lines.

Q. Is the check result normal?
Go to Step 3.
Repair the CAN bus line. (Refer to GROUP 54C - Troubleshooting .) Then go to Step 2.

STEP 2. Diagnosis code recheck after resetting CAN bus lines
Check again if the diagnosis code No. P1A2A is set to the EV-ECU.
(1)Erase the stored diagnosis code.
(2)Set the electric motor switch from the LOCK (OFF) position to the ON position.
(3)Set the electric motor switch to the LOCK (OFF) position, and start the electric motor unit.
(4)Run the vehicle.
(5)Check if the diagnosis code is set.

Q. Is the diagnosis code set?
Go to Step 3.
This diagnosis is complete.

STEP 3. Use M.U.T.-III to confirm a diagnosis code of other systems.
Check if the diagnosis code No. P1A2A is set to the MCU.

Q. Is the diagnosis code set?
Carry out troubleshooting for the diagnosis code No. P1A2A. (Refer to .) Then go to Step 4.
Go to Step 4.

STEP 4. Diagnosis code recheck
Check again if the diagnosis code is set to the EV-ECU.
(1)Erase the stored diagnosis code.
(2)Set the electric motor switch from the LOCK (OFF) position to the ON position.
(3)Set the electric motor switch to the LOCK (OFF) position, and start the electric motor unit.
(4)Run the vehicle.
(5)Check if the diagnosis code is set.

Q. Is the diagnosis code set?
Return to Step 1.
The diagnosis is complete.