Code No. U1109
ETACS CAN timeout
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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,
diagnose the CAN bus lines (Refer to GROUP 54C - CAN Bus Diagnostics Table
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- If diagnosis codes U1109 is set in ASC-ECU, always diagnose the CAN bus line. If
there is any fault in the CAN bus lines, an incorrect diagnosis code may be set. In this case,
the set diagnosis code is not highly reliable.
- Before replacing the ECU, ensure that the communication circuit is normal.
- When the hydraulic unit (integrated with ASC-ECU) is replaced, always carry out
the calibration of the steering wheel sensor and the G and yaw rate sensor (Refer to and ).
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OPERATION
The ASC-ECU communicates with the ETACS-ECU via the CAN bus lines.
DIAGNOSIS CODE SET CONDITIONS
If the ACS-ECU cannot receive any signal from the ETACS-ECU for a predetermined period,
this diagnosis code will be set.
PROBABLE CAUSES
- The CAN bus line is defective.
- Malfunction of the ETACS-ECU
- Malfunction of the hydraulic unit assembly (integrated with ASC-ECU)
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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 ).
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. U1109 set?
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Go to Step 3.
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This diagnosis is complete.
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STEP 3. Use M.U.T.-III to confirm a diagnosis code of other systems.
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Check whether a diagnosis code is set in the ETACS-ECU (Refer to GROUP 54A - ETACS-ECU,
Troubleshooting, Diagnosis Code Chart ).
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Q.
Is the diagnosis code set?
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Follow the relevant diagnosis code procedure. Then go to Step 6.
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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 whether an ETACS-ECU "time-out" related diagnosis code is set in other ECUs.
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Q.
Is the diagnosis code set?
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Replace the ETACS-ECU (Refer to GROUP 54A - ETACS-ECU ). Then
go to Step 6.
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Go to Step 5.
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STEP 5. 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)Erase the set diagnosis code.
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(2)Ignition switch: "LOCK" (OFF)
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Q.
Is diagnosis code No. U1109 set?
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Replace the hydraulic unit (integrated with ASC-ECU) (Refer to ).
Then go to Step 6.
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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 6. 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)Erase the set diagnosis code.
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(2)Ignition switch: "LOCK" (OFF)
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Q.
Is diagnosis code No. U1109 set?
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Return to Step 3.
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This diagnosis is complete.
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