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DTC U1920: FMCU K-line error
 
 
cautionBefore replacing the ECU, ensure that the communication circuit is normal.
 
 
DTC SET CONDITIONS
The PHEV-ECU sets DTC U1920 when the DTC (U1910, U1920) is set in the FEMCU.
 
 
 
PROBABLE CAUSES
  • Malfunction of the FEMCU.
  • Damaged harness or connector.
  • Malfunction of the PHEV-ECU.
 
 
 
 
DIAGNOSIS
STEP 1. Using scan tool (M.U.T.-IIISE), check whether the other DTC is set.
Check whether the other DTC (K-Line related DTC) is set in the FEMCU (Refer to GROUP 54Db - Diagnostic Trouble Code Chart ).
Is the DTC set?
Troubleshoot for the relevant DTC.
Go to Step 2.
 
STEP 2. Check the signal line for open circuit, short to ground circuit and short to power supply circuit (PHEV-ECU and FEMCU)
Check the wiring harness between the PHEV-ECU connector (terminal KLN1) and the FEMCU (terminal KLN1).
Is the check result normal?
Go to Step 3.
Repair the connector or wiring harness.
 
STEP 3. 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 ).