Code No.U15A0:
FCM-ECU CAN timeout
caution |
- If diagnosis
code No. U15A0 is set in the combination meter, always diagnose the CAN bus lines.
- Whenever the ECU is replaced, ensure that the communication circuit is normal.
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DIAGNOSTIC FUNCTION
If the signal from laser radar (FCM-ECU) cannot be received, the combination meter sets
the diagnosis code No. U15A0.
JUDGEMENT CRITERIA
With the ignition switch is at ON position, the diagnosis code No. U1190 is not stored
and the diagnosis code No. U1195 is not stored, if the communication with the laser radar (FCM-ECU) cannot
be established for 2,500 ms or more, the combination meter determines that a problem has occurred.
COMMENTS ON TROUBLE SYMPTOM
Current trouble
- Connector(s) or wiring harness in the CAN bus lines between the laser radar (FCM-ECU)
and the combination meter, the power supply system to the laser radar (FCM-ECU), the laser radar (FCM-ECU)
itself, or the combination meter may be defective.
Past trouble
- Carry out diagnosis with particular emphasis on connector(s) or wiring harness in
the CAN bus lines between the laser radar (FCM-ECU) and the combination meter, and the power
supply system to the laser radar (FCM-ECU). For diagnosis procedures, refer to "How to cope
with past trouble" (Refer to GROUP 00 - How to Use Troubleshooting/Inspection
Service Points).
note |
For a past trouble, you may not find it by the M.U.T.-III CAN bus diagnostics even if
there is any failure in CAN bus lines. In this case, refer to GROUP 00, How to Use Troubleshooting/Inspection
Service Points, and check the CAN bus lines. You can narrow down the possible cause of the trouble
by referring to the diagnosis code, which is set regarding the CAN communication-linked ECUs
(Refer to GROUP 54C - CAN Bus Line Diagnostic Flow).
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PROBABLE CAUSES
- Damaged harness wires and connectors
- Malfunction of laser radar (FCM-ECU)
- Malfunction of combination meter
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STEP 1. M.U.T.-III CAN bus diagnostics.
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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 2.
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Repair the CAN bus lines. (Refer to GROUP 54C - Troubleshooting ).
Repair the CAN bus line and go to Step 5.
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STEP 2. M.U.T.-III other system diagnosis code.
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Check if a diagnosis code, which relates to CAN communication-linked systems below, is
set.
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ETACS-ECU
- Code No. U15A0: FCM-ECU timeout diagnosis code
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Q.
Is the diagnosis code set?
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Go to Step 3.
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Go to Step 4.
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STEP 3. Check whether the diagnosis code is reset.
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Check again if the diagnosis code is set to the combination meter.
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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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(3)On completion, check that the diagnosis code is reset.
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Q.
Is the diagnosis code set?
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Replace laser radar (FCM-ECU) and then go to Step 5.
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A poor connection, open circuit or other intermittent malfunction is present in
the CAN bus lines between the laser radar (FCM-ECU) and the combination meter (Refer to GROUP
00 - How to use troubleshooting/Inspection Service Points).
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STEP 4. Check whether the diagnosis code is reset.
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Check again if the diagnosis code is set to the combination meter.
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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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(3)On completion, check that the diagnosis code is reset.
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Q.
Is the diagnosis code set?
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Replace combination meter and then go to Step 5.
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A poor connection, open circuit or other intermittent malfunction is present in
the CAN bus lines between the laser radar (FCM-ECU) and the combination meter (Refer to GROUP
00 - How to use troubleshooting/Inspection Service Points).
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STEP 5. Check whether the diagnosis code is reset.
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Check again if the diagnosis code is set to the combination meter.
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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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(3)On completion, check that the diagnosis code is reset.
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Q.
Is the diagnosis code set?
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Go to Step 1.
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The procedure is complete.
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