Code No. U1108:
Meter 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 U1108 is set in ASTC-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.
- Whenever ECU is replaced, ensure that the CAN bus lines are normal.
- When the hydraulic unit (integrated with ASTC-ECU) is replaced, always carry out
the calibration of the steering wheel sensor and the G and yaw rate sensor (Refer to ).
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OPERATION
The ASTC-ECU communicates with the combination meter via the CAN bus lines.
DIAGNOSIS CODE SET CONDITIONS
If the ASTC-ECU cannot receive any signal from the combination meter for a predetermined
period, this diagnosis code will be set.
PROBABLE CAUSES
- The CAN bus line is defective.
- Malfunction of the combination meter
- Malfunction of the hydraulic unit assembly (integrated with ASTC-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 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. U1108 set?
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Go to Step 3.
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This diagnosis is complete.
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STEP 3. Check for diagnosis codes of other systems.
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Check whether a diagnosis code is set in the combination meter (Refer to GROUP 54A - Combination
Meter, Troubleshooting, Diagnosis Code Chart ).
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Q.
Is the diagnosis code set?
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Follow the relevant diagnosis code procedure (Refer to GROUP 54A - Combination
Meter, Troubleshooting, Diagnosis Code Chart ). Then go to Step
6.
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Go to Step 4.
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STEP 4. Check for diagnosis codes of other systems.
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Check whether a combination meter "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 combination meter (Refer to GROUP 54A - Combination Meter ).
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)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)Erase the diagnosis code.
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(4)Turn the ignition switch to the "LOCK" (OFF) position.
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(5)Turn the ignition switch to the "ON" position.
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(6)Check if the diagnosis code is set.
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Q.
Is diagnosis code No. U1108 set?
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Replace the hydraulic unit assembly (integrated with ASTC-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)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)Erase the diagnosis code.
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(4)Turn the ignition switch to the "LOCK" (OFF) position.
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(5)Turn the ignition switch to the "ON" position.
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(6)Check if the diagnosis code is set.
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Q.
Is diagnosis code No. U1108 set?
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Return to Step 1.
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The procedure is complete.
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