Code No. P0A90:
Motor overcurrent continuation abnormality (MCU)
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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.
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ELECTRIC MOTOR UNIT CONTROL SYSTEM CIRCUIT
DIAGNOSIS CODE SET CONDITIONS
If the MCU judges the diagnosis code No. P1A29 Motor overcurrent three times in 60 seconds, it
will set the diagnosis code No. P0A90.
PROBABLE CAUSES
- Damaged high-voltage harness wires
- Malfunction of the motor (electric motor unit)
- Malfunction of the MCU
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STEP 1. M.U.T.-III CAN bus diagnosis
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Use the M.U.T.-III to diagnose the CAN bus lines.
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Q.
Is the check result normal?
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 Go to Step 3.
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 Repair the CAN bus line. (Refer to GROUP 54C - Troubleshooting  .)
Then go to Step 2.
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STEP 2. Diagnosis code recheck
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Check again if the diagnosis code is set to the MCU.
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(1)Erase the stored diagnosis code.
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(2)Set the electric motor switch from the "LOCK" (OFF) position to the "ON" position.
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(3)Check if the diagnosis code is set.
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Q.
Is the diagnosis code set?
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Go to Step 3.
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The diagnosis is complete.
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STEP 3. ?Check whether the diagnosis code is set.
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Check if the diagnosis code No. P1A29 for other systems is set to the MCU.
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Q.
Is the diagnosis code set?
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Carry out troubleshooting for the diagnosis code No. P1A29. (Refer to .)
Then go to Step 4.
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Go to Step 4.
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STEP 4. High-voltage connector check: G-07, G-08, G-09 MCU high-voltage
terminal
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Carry out the check on the high-voltage circuit while reading
carefully the precautions on handling a high-voltage vehicle. (Refer to .)
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Wear the specified protection equipment during the check.
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(1)Shut down the high voltage.
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(2)Check that the following terminals are tightened to the specified torque. (Refer
to .)
- G-07, G-08, G-09 MCU high-voltage terminal
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Q.
Is the check result normal?
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Go to Step 5.
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Tighten the high-voltage terminal to the specified torque. (Refer to .)
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STEP 5. Diagnosis code recheck
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Check again if the diagnosis code is set to the MCU.
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(1)Erase the stored diagnosis code.
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(2)Set the electric motor switch from the "LOCK" (OFF) position to the "ON" position.
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(3)Check if the diagnosis code is set.
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Q.
Is the diagnosis code set?
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Replace the MCU.(Refer to .) Then go to Step
6.
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The diagnosis is complete.
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STEP 6. Diagnosis code recheck
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Check again if the diagnosis code is set to the MCU.
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(1)Erase the stored diagnosis code.
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(2)Set the electric motor switch from the "LOCK" (OFF) position to the "ON" position.
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(3)Check if the diagnosis code is set.
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Q.
Is the diagnosis code set?
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Replace the motor (electric motor unit). (Refer to .)
Then go to Step 7.
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The diagnosis is complete.
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STEP 7. Diagnosis code recheck
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Check again if the diagnosis code is set to the MCU.
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(1)Erase the stored diagnosis code.
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(2)Set the electric motor switch from the "LOCK" (OFF) position to the "ON" position.
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(3)Check if the diagnosis code is set.
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Q.
Is the diagnosis code set?
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Go to Step 1.
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The diagnosis is complete.
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