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DTC U0100 Engine ECU CAN timeout
DTC U0114 AWD-ECU CAN timeout
DTC U0126 SAS CAN timeout
DTC U0141 ETACS-ECU CAN timeout
 
 
caution
  • If there is any problem in the CAN bus lines, an incorrect DTC 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 ECM, AWD-ECU <Vehicles without S-AWC>, AWC-ECU <Vehicles with S-AWC>, steering wheel sensor and ETACS-ECU are sent to the EPS-ECU.
 
 
 
FUNCTION
The signals from the ECM, AWD-ECU <Vehicles without S-AWC>, AWC-ECU <Vehicles with S-AWC>, steering wheel sensor and ETACS-ECU are sent to the EPS-ECU for motor control.
 
 
 
TROUBLE JUDGMENT
Check Conditions
  • The power supply circuit system DTC (No. C1540, C1541) is not set.
  • The DTC related to engine circuit system, AWD circuit system, steering wheel sensor circuit system and ETACS circuit system is set.
Judgment Criterion
  • The signals from the ECM, AWD-ECU <Vehicles without S-AWC>, AWC-ECU <Vehicles with S-AWC>, steering wheel sensor 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 sets DTC No. U0100, U0114, U0126 or U0141.
  • If DTC No. U0100 is set, the ECU displays the electric power steering warning symbol to limit the power assistance.
  • If DTC No. U0126 is set, the feeling of steerage will be aggravated.
 
 
 
TROUBLESHOOTING HINTS
  • Malfunction of CAN bus line
  • Malfunction of the EPS-ECU
  • Malfunction of the ECM
  • Malfunction of the ETACS-ECU
  • Malfunction of the AWC-ECU <Vehicles with S-AWC>
  • Malfunction of the AWD-ECU <Vehicles without S-AWC>
  • Malfunction of the steering wheel sensor
 
 
 
 
DIAGNOSIS
STEP 1. Scan tool (M.U.T.-III) CAN bus diagnostics
(1)
cautionTo prevent damage to scan tool (M.U.T.-III), always turn the ignition switch to the "LOCK" (OFF) position before connecting or disconnecting scan tool (M.U.T.-III).
Connect scan tool (M.U.T.-III). Refer to "How to connect the Scan Tool (M.U.T.-III) ."
(2) Turn the ignition switch to the "ON" position.
(3) Diagnose the CAN bus line.
(4) Turn the ignition switch to the "LOCK" (OFF) position.
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. DTC recheck after resetting CAN bus lines
(1) Erase the DTC.
(2) Turn the ignition switch from the "LOCK" (OFF) position to the "ON" position.
(3) Check if the DTC is set.
Is DTC U0100, U0114, U0126 or U0141 set?
Go to Step 3.
This diagnosis is complete.
 
STEP 3. Scan tool (M.U.T.-III) DTC
Use scan tool (M.U.T.-III) to check if the same DTC (time-out) is set in the other ECU.
Is any DTC set?
: Replace the ECM (Refer to GROUP 13A - Engine Control Module (ECM) <2.4 L Engine>, GROUP 13B - Engine Control Module (ECM) <3.0 L Engine>), and then go to Step 4.
: Replace the AWD-ECU (Refer to GROUP 27C - Troubleshooting/Inspection Chart for DTC ) <Vehicles without S-AWC> or AWC-ECU (Refer to GROUP 23A - Troubleshooting/Inspection Chart for DTC <CVT (Vehicles with S-AWC)> or GROUP 23C - Troubleshooting/Inspection Chart for DTC <A/T (Vehicles with S-AWC)>), and then go to Step 4.
: Replace the steering wheel sensor (Refer to GROUP 35C - Steering Wheel Sensor ), and then go to Step 4.
: Replace the ETACS-ECU (Refer to GROUP 54A - ETACS ), and then go to Step 4.
: Go to Step 4.
 
STEP 4. Check whether the DTC is set again.
(1) Erase the DTC.
(2) Turn the ignition switch from the LOCK (OFF) position to the ON position.
(3) Check if the DTC is set.
Is DTC U0100, U0114, U0126 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 DTC is set again.
(1) Erase the DTC.
(2) Turn the ignition switch from the LOCK (OFF) position to the ON position.
(3) Check if the DTC is set.
Is DTC U0100, U0114, U0126 or U0141 set?
Return to Step 1.
This diagnosis is complete.