Code No. U0001:
Bus-off
caution |
- If there is any
problem in the CAN bus lines, an incorrect diagnosis code may be set. Prior to this diagnosis,
diagnose the CAN bus lines (Refer to GROUP 54C - CAN Bus Diagnostics Table
).
- Whenever ECU is replaced, ensure that the CAN bus lines are normal.
- When the steering wheel sensor is replaced, always carry out calibration to make
ASTC-ECU learn the neutral point (Refer to
).
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OPERATION
The steering wheel sensor outputs the steering wheel status to ASTC-ECU via the CAN bus
lines.
DIAGNOSIS CODE SET CONDITIONS
When the system detects a malfunction in the CAN-bus line.
PROBABLE CAUSES
- The CAN bus line is defective.
- Damaged wiring harness and connectors
- Malfunction of the steering wheel sensor
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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 lines (Refer to GROUP 54C - CAN Bus Diagnostics Table ).
On completion, go to Step 2.
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STEP 2. Diagnosis code recheck after resetting CAN bus lines
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Q.
Is diagnosis code No. U0001 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 again.
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Check again if the diagnosis code is set.
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(1)Turn the ignition switch to the "LOCK" (OFF) position.
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(2)Turn the ignition switch to the "ON" position.
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(3)Check if the diagnosis code is set.
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(4)Turn the ignition switch to the "LOCK" (OFF) position.
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Q.
Is diagnosis code No. U0001 set?
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Replace the steering wheel sensor. (Refer to .)
Then go to Step 4.
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The trouble can be an intermittent malfunction (Refer to GROUP 00 - How
to Cope with Intermittent Malfunction ).
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STEP 4. Check whether the diagnosis code is set again.
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Check again if the diagnosis code is set.
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(1)Turn the ignition switch to the "LOCK" (OFF) position.
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(2)Turn the ignition switch to the "ON" position.
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(3)Check if the diagnosis code is set.
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(4)Turn the ignition switch to the "LOCK" (OFF) position.
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Q.
Is diagnosis code No. U0001 set?
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Return to Step 1.
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The procedure is complete.
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