Code No. U15A0:
FCM-ECU 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 U15A0 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.
- Whenever ECU is replaced, ensure that the CAN bus lines are normal.
- When the hydraulic unit (integrated with ASC-ECU) is replaced, always carry out
the calibration of the G and yaw rate sensor and the steering wheel sensor (Refer to and ).
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OPERATION
The ASC-ECU communicates with the FCM-ECU via the CAN bus lines.
DIAGNOSIS CODE SET CONDITIONS
If the ASC-ECU cannot receive any signal from the FCM-ECU for a predetermined period,
this diagnosis code will be set.
PROBABLE CAUSES
- The CAN bus line is defective.
- Malfunction of the FCM-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. U15A0 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 if the diagnosis code is set in the FCM-ECU (Refer to GROUP 54A -
Forward
Collision Mitigation System (Low speed range) (FCM-LS), Troubleshooting, Diagnosis Function ).
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Q.
Is the diagnosis code set?
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Follow the relevant diagnosis code procedure. (Refer to GROUP 54A -
Forward
Collision Mitigation System (Low speed range) (FCM-LS), Troubleshooting, Diagnosis Code Chart ).
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 FCM-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 laser radar (FCM-ECU) (Refer to GROUP 54A -
Forward Collision
Mitigation System (Low speed range) (FCM-LS), Laser Radar ).
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. U15A0 set?
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Replace the hydraulic unit assembly (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. U15A0 set?
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Return to Step 3.
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This diagnosis is complete.
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