Code No. P1A24: Ready waiting time-out (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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OPERATION
- MCU communicates with the EV-ECU via CAN.
DIAGNOSIS CODE SET CONDITIONS
- When the diagnosis code No. P1A24 is set to the MCU, the diagnosis code No. P1A24 will be set.
PROBABLE CAUSES
- Malfunction of the EV-ECU
- Malfunction of the MCU system
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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 after resetting CAN bus lines
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Check again if the diagnosis code No. P1A24 is set to the EV-ECU.
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(1)Erase the stored diagnosis code.
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(2)Start the electric motor unit, and then set the electric motor switch to the LOCK (OFF) position.
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(3)Set the electric motor switch from the LOCK (OFF) position to the ON position.
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(4)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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This 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 for other systems is set to the EV-ECU.
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Q.
Is the diagnosis code set?
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Carry out troubleshooting for the EV-ECU (refer to ). Erase the diagnosis code, and go to Step 4.
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Go to Step 4.
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STEP 4. Use M.U.T.-III to confirm a diagnosis code of other systems.
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Check if the diagnosis code No. P1A24 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. P1A24. (Refer to .) Then go to Step 5.
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Go to Step 5.
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STEP 5. Diagnosis code recheck
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Check again if the diagnosis code is set to the EV-ECU.
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(1)Erase the stored diagnosis code.
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(2)Start the electric motor unit, and then set the electric motor switch to the LOCK (OFF) position.
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(3)Set the electric motor switch from the LOCK (OFF) position to the ON position.
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(4)Check if the diagnosis code is set.
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Q.
Is the diagnosis code set?
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Return to Step 1.
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The diagnosis is complete.
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