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.
ELECTRIC MOTOR UNIT CONTROL SYSTEM CIRCUIT
OPERATION
The EV-ECU controls the IGBT gate in the MCU by outputting
the gate shutdown signal to the MCU. The MCU also transmits the input status of the gate shutdown signal
to the EV-ECU as a feedback signal by means of the CAN signal.
DIAGNOSIS CODE SET CONDITIONS
If the gate shutdown signal commanded by the EV-ECU differs
from the feedback signal received from the MCU for 1 second or longer, the diagnosis code No.
P1A18 will be set.
PROBABLE CAUSES
Damaged wiring harness or connector(s)
Malfunction of the MCU
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. P1A18 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.
)
)
)
Go to Step 3.
Repair the CAN bus line. (Refer to GROUP 54C - Troubleshooting 
.)
Then go to Step 2.