[Previous][Next]
DTC U109B: ELC. Parking lock LIN error
 
 
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.
 
 
DTC SET CONDITIONS
The PHEV-ECU sets this DTC when it cannot communicate with the electric parking driver unit via LIN correctly.
 
 
 
PROBABLE CAUSES
  • Malfunction of LIN bus line.
  • Malfunction of the electrical parking driver unit.
  • Malfunction of the PHEV-ECU.
 
 
 
 
DIAGNOSIS
STEP 1. Using scan tool (M.U.T.-IIISE), check the data list. (Electrical parking driver unit)
Check that the following data list display contents are normal (Refer to GROUP 22A - Data List Reference Table ).
Data list
  • Item No.15: LIN communication fail flag
 
Check conditionNormal condition
The parking lock statusNormalOFF
AbnormalON
Is the check result normal?
Go to Step 6.
Go to Step 2.
 
STEP 2. Using scan tool (M.U.T.-IIISE), check whether the other DTC is set.
In addition, check whether the LIN related DTC is set in the PHEV-ECU.
Is the DTC set?
Troubleshoot for the relevant DTC.
Go to Step 3.
 
STEP 3. Using scan tool (M.U.T.-IIISE), check whether the other DTC is set.
In addition, check whether the LIN related DTC is set in the BMU (Refer to GROUP 54Dc - Inspection Chart for Diagnostic Trouble Codes ).
Is the DTC set?
Troubleshoot for the relevant DTC.
Go to Step 4.
 
STEP 4. Check of short to ground and open circuit in the power supply line (PHEV-ECU and the electrical parking driver unit).
Check the wiring harness between PHEV-ECU connector (terminal LIN1) and the electrical parking driver unit connector (terminal LIN).
Is the check result normal?
Go to Step 5.
Repair the connector or wiring harness.
 
STEP 5. Using scan tool (M.U.T.-IIISE), check whether the DTC is set again.
Recheck the DTC.
(1) Erase the DTC.
(2) Turn off the power supply mode of the electric motor switch.
(3) Turn on the power supply mode of the electric motor switch.
(4) Check the DTC.
Is the DTC set?
Replace the electrical parking driver unit (Refer to GROUP 22A - Electrical Parking Drive Unit ).
The trouble can be an intermittent malfunction (Refer to GROUP 00, How to Cope with Intermittent Malfunction ).
 
STEP 6. Using scan tool (M.U.T.-IIISE), check whether the DTC is set again.
Recheck the DTC.
(1) Erase the DTC.
(2) Turn off the power supply mode of the electric motor switch.
(3) Turn on the power supply mode of the electric motor switch.
(4) Check the DTC.
Is the DTC set?
Replace the PHEV-ECU (Refer to ).
The trouble can be an intermittent malfunction (Refer to GROUP 00, How to Cope with Intermittent Malfunction ).