CAN COMMUNICATION SYSTEM, Diagnostic DTC:U0182

DTC Code DTC Name
U0182 Lost Communication with AFS ECU

DESCRIPTION

DTC No. DTC Detection Condition Trouble Area
U0182 No communication from the AFS ECU continues.

  • AFS ECU branch wire or connector

  • Power source circuit of AFS ECU

  • AFS ECU

WIRING DIAGRAM

A01ELJ8E01

INSPECTION PROCEDURE

Note


  • Turn the ignition switch off before measuring the resistances between CAN bus main wires and between CAN bus branch wires.

  • Turn the ignition switch off before inspecting CAN bus wires for a ground short.

  • After the ignition switch is turned off, check that the key reminder warning system and light reminder warning system are not operating.

  • Before measuring the resistance, leave the vehicle as is for at least 1 minute and do not operate the ignition switch, any other switches or the doors. If any doors need to be opened in order to check connectors, open the doors and leave them open.

Tech Tips


  • Operating the ignition switch, any other switches or a door triggers related ECU and sensor communication on the CAN. This communication will cause the resistance value to change.

  • Even after DTCs are cleared, if a DTC is stored again after driving the vehicle for a while, the malfunction may be occurring due to vibration of the vehicle. In such a case, wiggling the ECUs or wire harness while performing the inspection below may help determine the cause of the malfunction.

PROCEDURE


  1. RECONFIRM DTC OUTPUT


    1. Reconfirm DTCs.

      Tech Tips

      If CAN No. 2 bus DTC U1002 is output from the power management control ECU (GTS display: PM1 Gateway), troubleshoot for U1002 and check for malfunctions in the CAN No. 2 main bus circuit.

      Result
      Result Proceed to
      U1002 is not output from power management control ECU (GTS display: PM1 Gateway) A
      U1002 is output from power management control ECU (GTS display: PM1 Gateway) B

    B

    GO TO CIRCUITS INDICATED BY OUTPUT DTCS Click here

    A

  2. CHECK FOR OPEN IN CAN BUS WIRES (AFS ECU BRANCH WIRE)


    1. Turn the ignition switch off.

    2. A01EK6DE20
      Text in Illustration
      *1

      Front view of wire harness connector

      (to AFS ECU)

      Disconnect the AFS ECU connector.

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

      Standard Resistance
      Tester Connection Condition Specified Value
      D44-12 (CANH) - D44-13 (CANL) Ignition switch off 54 to 69 Ω

    NG

    REPAIR OR REPLACE CAN BUS BRANCH WIRE (AFS ECU BRANCH WIRE)

    OK

  3. CHECK HARNESS AND CONNECTOR (POWER SOURCE TERMINAL)


    1. A01EK6DE49
      Text in Illustration
      *1

      Front view of wire harness connector

      (to AFS ECU)

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

      Standard Voltage
      Tester Connection Condition Specified Condition
      D44-15 (IG) - Body ground Ignition switch ON 11 to 14 V

    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR (POWER SOURCE CIRCUIT)

    OK

  4. CHECK HARNESS AND CONNECTOR (GROUND TERMINAL)


    1. A01EK6DE50
      Text in Illustration
      *1

      Front view of wire harness connector

      (to AFS ECU)

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

      Standard Resistance
      Tester Connection Condition Specified Condition
      D44-22 (E1) - Body ground Always Below 1 Ω

    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR (GROUND TERMINAL)

    OK

    REPLACE AFS ECU Click here