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DTC U0168: KOS/WCM CAN Time-out
 
 
caution
  • If diagnostic trouble code No. U0168 is set, be sure to diagnose the CAN bus line.
  • When replacing the ECU, always check that the communication circuit is normal.
 
 
DIAGNOSTIC FUNCTION
If the signal from KOS-ECU cannot be received, the power liftgate control unit sets diagnostic trouble code No. U0168.
 
 
JUDGMENT CRITERIA
With the statuses that the ignition switch is at ON position, system voltage is 10 to 16 V (data from ETACS-ECU), and there is no malfunction to the power supply fuse, or odometer value is 80.5 km or more, if the communication with KOS-ECU cannot be established for 2,500 ms or more, the power liftgate control unit determines that a problem has occurred.
 
 
PROBABLE CAUSES
  • Malfunction of KOS-ECU
  • Malfunction of the power liftgate control unit
  • Malfunction of CAN bus line
 
 
DIAGNOSIS
STEP 1. Using scan tool (M.U.T.-III), diagnose the CAN bus line
(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 CAN bus line found to be normal?
Go to Step 2.
Repair the CAN bus line (Refer to GROUP 54C, Diagnosis ).
 
STEP 2. Using scan tool (M.U.T.-III), read the KOS diagnostic trouble code
Check if DTC is set in the KOS-ECU.
Is the DTC set?
Troubleshoot the KOS. Refer to GROUP 42B - DTC Chart .
Go to Step 3.
 
STEP 3. Using scan tool (M.U.T-III), read the other system diagnostic trouble code.
Check if DTC U0U0168 is set in the SRS-ECU, OSS-ECU, combination meter, ETACS-ECU, MMCS or radio and CD player.
(1)
cautionTo prevent damage to scan tool (M.U.T-III), always turn the power supply mode of the engine switch to the OFF position before connecting or disconnecting scan tool (M.U.T-III).
Connect scan tool (M.U.T-III). Refer to "How to connect scan tool (M.U.T.-III) ."
(2) Erase the DTC.
(3) Turn the power supply mode of the engine switch to ON.
(4) Check if DTC is set.
(5) Turn the power supply mode of the engine switch to OFF.
Is the DTC set?
Go to Step 4.
Go to Step 5.
 
STEP 4. Recheck for diagnostic trouble code.
Check again if the DTC is set in the power liftgate control unit.
(1) Erase the DTC.
(2) Turn the power supply mode of the engine switch from OFF to ON.
(3) Check if DTC is set.
(4) Turn the power supply mode of the engine switch from ON to OFF.
Is the DTC set?
Replace the KOS-ECU.
Intermittent malfunction is suspected (Refer to GROUP 00 - How to Use Troubleshooting/Inspection Service Points - How to Cope with Intermittent Malfunction ).
 
STEP 5. Recheck for diagnostic trouble code.
Check again if the DTC is set in the power liftgate control unit.
(1) Erase the DTC.
(2) Turn the power supply mode of the engine switch from OFF to ON.
(3) Check if DTC is set.
(4) Turn the power supply mode of the engine switch from ON to OFF.
Is the DTC set?
Replace the power liftgate control unit.
Intermittent malfunction is suspected (Refer to GROUP 00 - How to Use Troubleshooting/Inspection Service Points - How to Cope with Intermittent Malfunction ).