Code No. U0100
Engine CAN timeout
| caution |
- If diagnosis
code No. U0100 is set, be sure to diagnose the CAN bus line.
- Before replacing the ECU, ensure that the power supply circuit, the earth circuit
and the communication circuit are normal.
|
DIAGNOSTIC FUNCTION
The headlamp automatic levelling-ECU sets diagnosis code No.U0100 when it cannot receive signals
from the engine-ECU.
JUDGEMENT CRITERIA
The headlamp automatic levelling-ECU cannot receive the signal from the engine-ECU via
the CAN bus line.
PROBABLE CAUSES
- Malfunction of CAN bus line
- Malfunction of engine-ECU
- Malfunction of headlamp automatic levelling-ECU
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 line (Refer to GROUP 54C - Troubleshooting 
).
STEP 2. M.U.T.-III other system diagnosis code
Check if diagnosis code is set in the engine-ECU.
Q.
Is the diagnosis code set?
Troubleshoot the engine (Refer to GROUP 13B - Diagnosis Code Chart <6B3> or
GROUP 13C - Diagnosis Code Chart <4N1>).
Go to Step 3.
STEP 3. Diagnosis code recheck
Check again if the diagnosis code is set in the headlamp automatic levelling-ECU.
|
|
(1)Erase the diagnosis code.
|
|
|
(2)Turn the ignition switch from the "LOCK" (OFF) position to the "ON" position.
|
|
|
(3)Check if the diagnosis code is set.
|
Q.
Is the diagnosis code set?
Replace the engine-ECU (Refer to GROUP 13B - Engine-ECU <6B3> or GROUP
13C - Engine-ECU <4N1>.) and
then go to Step 4.
A poor connection, open circuit, or other intermittent malfunction in the CAN
bus line between the headlamp automatic levelling-ECU and the engine-ECU. (Refer to GROUP 00 - How
to Use Troubleshooting/Inspection Service Points - How to Cope with Intermittent
Malfunction .)
STEP 4. Diagnosis code recheck
Check again if the diagnosis code is set in the headlamp automatic levelling-ECU.
|
|
(1)Erase the diagnosis code.
|
|
|
(2)Turn the ignition switch from the "LOCK" (OFF) position to the "ON" position.
|
|
|
(3)Check if the diagnosis code is set.
|
Q.
Is the diagnosis code set?
Replace the headlamp automatic levelling-ECU (Refer to )
and then go to Step 5.
A poor connection, open circuit, or other intermittent malfunction in the CAN
bus line between the headlamp automatic levelling-ECU and the engine-ECU. (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 set again.
Recheck if the diagnosis code is set.
|
|
(1)Erase the diagnosis code.
|
|
|
(2)Turn the ignition switch from the "LOCK" (OFF) position to the "ON" position.
|
|
|
(3)On completion, check that the diagnosis code is not set again.
|
Q.
Is the diagnosis code set?
Go to Step 1.
The procedure is complete.