Code No.U1000
OSS CAN timeout
caution |
- If the diagnosis
code No. U1000 is set, diagnose the CAN bus lines.
- When replacing the ECU, always check that the communication circuit is normal.
|
DIAGNOSIS FUNCTION
When the signal from OSS-ECU cannot be received, KOS-ECU sets the diagnosis code No.U1000.
PROBABLE CAUSES
- Malfunction of CAN bus line
- Malfunction of OSS-ECU
- Malfunction of KOS-ECU
DIAGNOSIS PROCEDURE
STEP 1. M.U.T.-III CAN bus diagnostics
Use M.U.T.-III to diagnose the CAN bus lines.
Q.
Is the check result normal?
Go to Step 2.
Repair the CAN bus line (Refer to GROUP 54C -
Troubleshooting
).
On completion, go to Step 2.
STEP 2. Check the M.U.T.-III Diagnosis code for other systems
Check that the OSS-ECU set a diagnosis code.
Q.
Is the diagnosis code set?
Diagnose the OSS-ECU. Refer to Troubleshooting
.
Go to Step 3
STEP 3. M.U.T.-III other system diagnosis code
Check if diagnosis code No.U1000 is set to the ETACS-ECU.
Q.
Is the diagnosis code set?
Go to Step 4.
Go to Step 5.
STEP 4. Check whether the diagnosis code is reset.
Recheck if the diagnosis code is set.
|
(1)Erase the diagnosis code.
|
|
(2)Turn the power supply mode of the engine switch from OFF to ON.
|
|
(3)Check if the diagnosis code is set.
|
Q.
Is the diagnosis code set?
Replace the OSS-ECU.
Intermittent malfunction is suspected (Refer to GROUP 00 -
How to Use Troubleshooting/Inspection
Service Points -
How to Cope with Intermittent Malfunction
).
STEP 5. Check whether the diagnosis code is reset.
Recheck if the diagnosis code is set.
|
(1)Erase the diagnosis code.
|
|
(2)Turn the power supply mode of the engine switch from OFF to ON.
|
|
(3)Check if the diagnosis code is set.
|
Q.
Is the diagnosis code set?
Replace KOS-ECU and register the ID codes (Refer to
).
Intermittent malfunction is suspected (Refer to GROUP 00 -
How to Use Troubleshooting/Inspection
Service Points -
How to Cope with Intermittent Malfunction
).