Code No. P1A16: High-voltage system error (2)



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




DIAGNOSIS CODE SET CONDITIONS



  • If the discharging time of the smooth condenser in the MCU reaches the specified time or more, the diagnosis code No. P1A16 will be set.

PROBABLE CAUSES



  • Malfunction of the MCU
  • Malfunction of the EV-ECU

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. P1A16 is set to the EV-ECU.
(1)Erase the stored diagnosis code.
(2)Start the electric motor unit, and then set the electric motor switch to the LOCK (OFF) position.
(3)Set the electric motor switch from the LOCK (OFF) position to the ON position.
(4)Check if the diagnosis code is set.

Q. Is the diagnosis code set?

Go to Step 3.
This diagnosis is complete.

STEP 3. Diagnosis code recheck


Check again if the diagnosis code is set to the EV-ECU.
(1)Erase the stored diagnosis code.
(2)Start the electric motor unit, and then set the electric motor switch to the LOCK (OFF) position.
(3)Set the electric motor switch from the LOCK (OFF) position to the ON position.
(4)Check if the diagnosis code is set.

Q. Is the diagnosis code set?

Replace the MCU. (Refer to .) Then go to Step 4.
Intermittent malfunction (Refer to GROUP 00 - How to Use Troubleshooting/Inspection Service Points - How to Cope with Intermittent Malfunction .)

STEP 4. Diagnosis code recheck


Check again if the diagnosis code is set to the EV-ECU.
(1)Erase the stored diagnosis code.
(2)Start the electric motor unit, and then set the electric motor switch to the LOCK (OFF) position.
(3)Set the electric motor switch from the LOCK (OFF) position to the ON position.
(4)Check if the diagnosis code is set.

Q. Is the diagnosis code set?

Replace the EV-ECU. (Refer to .) Then go to Step 5.
The diagnosis is complete.

STEP 5. Diagnosis code recheck


Check again if the diagnosis code is set to the EV-ECU.
(1)Erase the stored diagnosis code.
(2)Start the electric motor unit, and then set the electric motor switch to the LOCK (OFF) position.
(3)Set the electric motor switch from the LOCK (OFF) position to the ON position.
(4)Check if the diagnosis code is set.

Q. Is the diagnosis code set?

Return to Step 1.
The diagnosis is complete.