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DTC U1920: K-line error (master lost)
 
 
 
 
TROUBLE JUDGMENT
Check Condition
  • The power supply mode of the electric motor switch is ON.
 
 
PROBABLE CAUSES
  • Malfunction of the K-LINE
  • Malfunction of the PHEV-ECU
  • Malfunction of the power drive unit (FEMCU)

 
 
DIAGNOSIS
STEP 1. Resistance measurement at the power drive unit connector and the PHEV-ECU connector.
(1) Disconnect the connector, and measure at the wiring harness side.
(2) Measure the resistance between the power drive unit connector (KLN1 terminal) and the PHEV-ECU connector (KLN1 terminal).
OK: The resistance should be 2 ohms or less.
Is the check result normal?
Go to Step 2.
Replace the connector(s) or wiring harness.
 
STEP 2. After replacing the PHEV-ECU, recheck the diagnostic trouble code.
Replace the PHEV-ECU (Refer to ).
Is the DTC set?
Replace the power drive unit (Refer to ).
The procedure is complete.