Code No. U0155:
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 -
Troubleshooting
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- If diagnosis code No. U0155 is set in ACC/FCM-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 the ECU is replaced, ensure that the CAN bus lines are normal.
- When the ACC/FCM-ECU is replaced, calibrate the radar (refer to ).
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OPERATION
The ACC/FCM-ECU communicates with the combination meter via the CAN bus lines.
DIAGNOSIS CODE SET CONDITION
The ACC/FCM-ECU receives the combination meter system-related signals from the combination
meter via the CAN bus lines. When these signals cannot be received, the ECU sets this diagnosis
code.
PROBABLE CAUSES
- Malfunction of the CAN bus line
- Malfunction of the combination meter
- Malfunction of the ACC/FCM-ECU
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STEP 1. M.U.T.-III CAN bus diagnostics.
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Use M.U.T.-III to perform the CAN bus diagnosis.
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Q.
Is the check result normal?
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 Go to Step 2.
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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. Use M.U.T.-III to confirm a diagnosis code of other systems.
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Check if the diagnosis code is set in the combination meter (Refer to GROUP 54A -
Combination
Meter, Troubleshooting, Diagnosis Function).
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Q.
Is the diagnosis code set?
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Troubleshoot the combination meter diagnosis code (Refer to GROUP 54A -
Combination
Meter, Troubleshooting, Diagnosis Code Chart).
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Go to Step 3.
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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 an combination "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).
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Go to Step 4.
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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 in the ACC/FCM-ECU.
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(1)Erase the diagnosis code.
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(2)Turn the ignition switch from "LOCK" (OFF) position to "ON" position.
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(4)Press the FCM and UMS ON/OFF switch to turn the FCM system to ON.
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(5)On completion, check that the diagnosis code is set again.
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Q.
Is diagnosis code No. U0155 set?
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Replace the ACC/FCM-ECU (Refer to ).
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Intermittent malfunction (Refer to GROUP 00 -
How to Cope with Intermittent
Malfunctions).
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