SFI SYSTEM, Diagnostic DTC:U011B

DTC Code DTC Name
U011B Lost Communication with Rocker Arm Control Module "A"

DESCRIPTION

The ECM and continuously variable valve lift controller assembly send signals via CAN communication. When there is a malfunction in the CAN communication, a DTC is stored and the MIL illuminates.

DTC No. DTC Detection Condition Trouble Area
U011B CAN communication stops (1 trip detection logic).

  • CAN communication circuit

  • Continuously variable valve lift controller assembly

  • ECM

WIRING DIAGRAM

A01ITJOE03

INSPECTION PROCEDURE

Note

When one of the following DTCs is stored and the MIL is illuminated, DTC P1047 is stored and actuator position learning is performed every time the engine is started. Also, after the system returns to normal, the following occurs during the first driving cycle: 1) DTC P1047 is stored, 2) actuator position learning is performed and 3) the MIL illuminates during actuator position learning.

Actuator position learning is performed when these DTCs are output.
P1046, P1049, P104A, P1055, P2646, P2647, P2648, P2649, P264A, U011B

Tech Tips


  • When there is no power (+B) supplied to the continuously variable valve lift controller assembly, DTC U011B is stored. After the continuously variable valve lift controller assembly power supply system and communication lines have been connected or repaired, actuator position learning is performed and DTC P1047 is stored the next time the vehicle is driven.

  • After performing repairs, perform the following procedures and check that DTCs are not output again.


  1. Connect the intelligent tester to the DLC3.

  2. Start the engine and warm it up.

  3. Turn the tester on.

  4. Clear the DTCs Click here.

  5. Turn the ignition switch off and wait 10 seconds.

  6. Start the engine and idle it for 20 seconds.

  7. Clear the DTCs Click here.

  8. Turn the ignition switch off and wait 10 seconds.

  9. Start the engine and idle it for 20 seconds.

  10. Turn the ignition switch off and wait 10 seconds.

  11. Turn the ignition switch to ON.

  12. Enter the following menus: Powertrain / Engine and ECT / DTC.

  13. Read the DTCs.

Note

Inspect the fuses for circuits related to this system before performing the following inspection procedure.

PROCEDURE


  1. CHECK CONTINUOUSLY VARIABLE VALVE LIFT CONTROLLER ASSEMBLY (POWER SOURCE)


    1. A01IORXE04
      Text in Illustration
      *1

      Component without harness connected

      (Continuously Variable Valve Lift Controller)

      Disconnect the continuously variable valve lift controller assembly connector.

    2. Measure the voltage according to the value(s) in the table below.

      Standard Voltage
      Tester Connection Switch Condition Specified Condition
      C49-1(+B) - Body ground Ignition switch ON 11 to 14 V

    3. Reconnect the continuously variable valve lift controller assembly connector.


    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR (CONTINUOUSLY VARIABLE VALVE LIFT CONTROLLER - BATTERY)

    OK

  2. CHECK HARNESS AND CONNECTOR (CONTINUOUSLY VARIABLE VALVE LIFT CONTROLLER - ECM)


    1. Disconnect the continuously variable valve lift controller assembly connector.

    2. Disconnect the ECM connector.

    3. Measure the resistance according to the value(s) in the table below.

      Standard Resistance (Check for Open)
      Tester Connection Switch Condition Specified Condition
      C49-4 (CAN+) - A51-4 (CAN+) Ignition switch off Below 1 Ω
      C49-2 (CAN-) - A51-5 (CAN-) Ignition switch off Below 1 Ω
      Standard Resistance (Check for Short)
      Tester Connection Switch Condition Specified Condition
      C49-4 (CAN+) or A51-4 (CAN+) - Body ground Ignition switch off 10 kΩ or higher
      C49-2 (CAN-) or A51-5 (CAN-) - Body ground Ignition switch off 10 kΩ or higher

    4. Reconnect the ECM connector.

    5. Reconnect the continuously variable valve lift controller assembly connector.


    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR (CONTINUOUSLY VARIABLE VALVE LIFT CONTROLLER - ECM)

    OK

  3. REPLACE CONTINUOUSLY VARIABLE VALVE LIFT CONTROLLER ASSEMBLY


    1. Replace the continuously variable valve lift controller assembly Click here.


    NEXT

  4. PERFORM SIMULATION TEST


    1. Connect the intelligent tester to the DLC3.

    2. Turn the ignition switch to ON.

    3. Turn the tester on.

    4. Clear the DTC Click here.

    5. Perform a simulation test.


      1. Turn the ignition switch to ON and wait 5 seconds

      2. Start the engine and idle it for 5 seconds.

      3. Turn the ignition switch off and wait 5 seconds

    6. Turn the ignition switch to ON.

    7. Turn the tester on.

    8. Enter the following menus: Powertrain / Engine and ECT / DTC.

    9. Read the DTCs.

      Result
      Result Proceed to
      DTC U011B is output A
      DTC is not output B

    B

    END

    A

    REPLACE ECM Click here