Code No. U0100
Engine CAN timeout Code No. U0114 4WD CAN timeout Code No. U0141 ETACS CAN
timeout
caution
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).
Whenever ECU is replaced, ensure that the CAN bus lines are normal.
OPERATION
The signals from the engine-ECU, 4WD-ECU and ETACS-ECU are
sent to the EPS-ECU.
FUNCTION
The signals from the engine-ECU, 4WD-ECU and ETACS-ECU are
sent to the EPS-ECU for motor control.
TROUBLE JUDGEMENT
Check Conditions
The power supply circuit system diagnosis code (No. C1540, C1541) is not set.
The diagnosis code related to engine circuit system, 4WD circuit system and ETACS
circuit system is set.
Judgement Criterion
The signals from the engine-ECU, 4WD-ECU and ETACS-ECU are not sent, and the microcomputer
determines that there is a problem in the system.
Fail Safe, Back Up Function
The EPS-ECU stores diagnosis code No. U0100, U0114 or U0141. If diagnosis code No.
U0100 is stored, the ECU displays the electric power steering warning symbol to limit the power
assistance.
PROBABLE CAUSES
Malfunction of CAN bus line
Malfunction of the EPS-ECU
Malfunction of the engine-ECU
Malfunction of the ETACS-ECU
Malfunction of the 4WD-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 3
Repair the CAN bus lines (Refer to GROUP 54C - CAN Bus Diagnostics Table ).
On completion, go to Step 2.
STEP 2. Diagnosis code recheck after resetting CAN bus lines
(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 codes U0100, U0114 or U0141 set?
Go to Step 3
This diagnosis is complete.
STEP 3. M.U.T.-III diagnosis code
Use M.U.T.-III to check if the same diagnosis code (time-out) is set in the other ECU.
Q.
Is any diagnosis code set?
YES (Code No. U0100 is set) : Replace the engine ECU (Refer to GROUP 13A - Engine-ECU <4B1>,
GROUP 13C - Engine-ECU <4J1>, GROUP 13D - Engine-ECU <4N1>),
and then go to Step 4.
YES (Code No. U0114 is set) : Replace the 4WD-ECU, and then go to Step 4.
YES (Code No. U0141 is set) : Replace the ETACS-ECU (Refer to GROUP 54A - ETACS .),
and then go to Step 4.
NO (No diagnosis code is set.) : Go to Step 4
STEP 4. Check whether the diagnosis code is reset
(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 codes U0100, U0114 or U0141 set?
Replace the EPS-ECU (Refer to ). Then go to
Step 5.
Intermittent malfunction (Refer to GROUP 00 - How to Cope with Intermittent
Malfunction ).
STEP 5. Check whether the diagnosis code is reset
(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 codes U0100, U0114 or U0141 set?