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- The signals from the engine-ECU, ABS-ECU <vehicles without ASC>, ASC-ECU <vehicles with ASC>, and ETACS-ECU are sent to the electric power steering-ECU.
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- The signals from the engine-ECU, ABS-ECU <vehicles without ASC>, ASC-ECU <vehicles with ASC>, and ETACS-ECU are sent to the electric power steering-ECU for motor control.
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Check Conditions
- The power supply circuit system diagnosis code (No. C1540, C1541) is not set.
- The diagnosis code related to engine circuit system, ABS circuit system <vehicles without ASC>, ASC circuit system <vehicles with ASC>, and ETACS circuit system is set.
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Judgement Criterion
- The signal from the engine-ECU is not received for 55 seconds.
- The signal from the ABS-ECU <vehicles without ASC>, ASC-ECU <vehicles with ASC>, and engine-ECU cannot be received for 11 seconds.
- The signals from the engine-ECU, ABS-ECU <vehicles without ASC>, ASC-ECU <vehicles with ASC>, and ETACS-ECU are not sent, and the microcomputer determines that there is a problem in the system.
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Fail Safe, Back Up Function
- The electric power steering-ECU illuminates the electric power steering warning display, and sets the diagnosis code Nos. U0100, U0121, and U0141. However, the assist operation is limited only with the diagnosis code No. U0121.
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- Malfunction of CAN bus line
- Malfunction of the electric power steering-ECU
- Malfunction of the engine-ECU
- Malfunction of the ETACS-ECU
- Malfunction of the ABS-ECU <vehicles without ASC>
- Malfunction of the ASC-ECU <vehicles with ASC>
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Use M.U.T.-III to diagnose the CAN bus lines.
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Q.
Is the check result normal?
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Repair the CAN bus lines (Refer to GROUP 54C - Troubleshooting ). On completion, go to Step 2.
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(1)Erase the diagnosis code.
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(2)Turn the ignition 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 codes U0100, U0121 or U0141 set?
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This diagnosis is complete.
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Use M.U.T.-III to check if the same diagnosis code (time-out) is set in the other ECU (CAN-C).
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Q.
Is any diagnosis code set?
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YES (Code No. U0100 is set) : Replace the engine ECU, and then go to Step 4.
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YES (Code No. U0121 is set) : Replace the ABS-ECU <vehicles without ASC>, ASC-ECU <vehicles with ASC>, and then go to Step 4.
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YES (Code No. U0141 is set) : Replace the ETACS-ECU, and then go to Step 4.
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NO (No diagnosis code is set.) : Go to Step 4.
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(1)Erase the diagnosis code.
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(2)Turn the ignition 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 codes U0100, U0121 or U0141 set?
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Replace the electric power steering-ECU (Refer to ).Then go to Step 5.
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Intermittent malfunction (Refer to GROUP 00 - How to Cope with Intermittent Malfunction ).
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(1)Erase the diagnosis code.
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(2)Turn the ignition 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 codes U0100, U0121 or U0141 set?
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This diagnosis is complete.
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