Code No.U15A0 FCM-ECU CAN timeout
| caution |
- If diagnosis code 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.
|
DIAGNOSTIC FUNCTION
If the signal from laser radar (FCM-ECU) cannot be received, the combination meter sets diagnosis code No. U15A0.
JUDGEMENT CRITERIA
With the ignition switch is at ON position, diagnosis code No. U1190 is not set and diagnosis code No. U1195 is not set, if the communication with the laser radar (FCM-ECU) cannot be established for 2500 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 ).
|
PROBABLE CAUSES
- Damaged harness wires and connectors
- Malfunction of laser radar (FCM-ECU)
- Malfunction of combination meter
DIAGNOSIS PROCEDURE
STEP 1. M.U.T.-III CAN bus diagnostics
Use the M.U.T.-III to diagnose the CAN bus lines.
Q.
Is the check result normal?
Go to Step 2.
Repair the CAN bus lines. (Refer to GROUP 54C - Troubleshooting ). Repair the CAN bus line and go to Step 5.
STEP 2. M.U.T.-III other system diagnosis code
Check if a diagnosis code, which relates to CAN communication-linked systems below, is set.
ETACS-ECU
- Code No.U15A0: FCM-ECU timeout diagnosis code
Q.
Is the diagnosis code set?
Go to Step 3.
Go to Step 4.
STEP 3. Check whether the diagnosis code is set again.
Check again if the diagnosis code is set in the combination meter.
|
|
(1)Erase the diagnosis code.
|
|
|
(2)Turn the ignition switch from "LOCK" (OFF) position to "ON" position.
|
|
|
(3)On completion, check that the diagnosis code is set again.
|
Q.
Is the diagnosis code set?
Replace laser radar (FCM-ECU) and then go to Step 5.
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 ).
STEP 4. Check whether the diagnosis code is set again.
Check again if the diagnosis code is set in the combination meter.
|
|
(1)Erase the diagnosis code.
|
|
|
(2)Turn the ignition switch from "LOCK" (OFF) position to "ON" position.
|
|
|
(3)On completion, check that the diagnosis code is set again.
|
Q.
Is the diagnosis code set?
Replace combination meter and then go to Step 5.
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 ).
STEP 5. Check whether the diagnosis code is set again.
Check again if the diagnosis code is set in the combination meter.
|
|
(1)Erase the diagnosis code.
|
|
|
(2)Turn the ignition switch from "LOCK" (OFF) position to "ON" position.
|
|
|
(3)On completion, check that the diagnosis code is set again.
|
Q.
Is the diagnosis code set?
Go to Step 1.
The procedure is complete.