Code No. P1A29: Motor overcurrent (MCU)



ELECTRIC MOTOR UNIT CONTROL SYSTEM CIRCUIT





DIAGNOSIS CODE SET CONDITIONS




PROBABLE CAUSES



  • High-voltage harness check
  • Malfunction of the MCU
  • Malfunction of the motor (electric motor unit)

DIAGNOSIS PROCEDURE


STEP 1. High-voltage connector check: G-07, G-08, G-09 MCU high-voltage terminal


danger Carry out the check on the high-voltage circuit while reading carefully the precautions on handling a high-voltage vehicle. (Refer to .)
danger Wear the specified protection equipment during the check.
(1)Shut down the high voltage.
(2)Check that the following terminals are tightened to the specified torque. (Refer to .)

  • G-07, G-08, G-09 MCU high-voltage terminal

Q. Is the check result normal?

Go to Step 2.
Tighten the high-voltage terminal to the specified torque. Refer to .)

STEP 2. 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 "START" position, and start the electric motor unit.
(4)Check if the diagnosis code is set.

Q. Is the diagnosis code set?

Replace the MCU. (Refer to .) Then go to Step 3.
The diagnosis is complete.

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)Set the electric motor switch to the "START" position, and start the electric motor unit.
(4)Check if the diagnosis code is set.

Q. Is the diagnosis code set?

Replace the motor (electric motor unit). (Refer to .) Then go to Step 4.
The diagnosis is complete.

STEP 4. 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)Set the electric motor switch to the "START" position, and start the electric motor unit.
(4)Check if the diagnosis code is set.

Q. Is the diagnosis code set?

Return to Step 1.
The diagnosis is complete.