SFI SYSTEM, Diagnostic DTC:U0073, U0101, U0122, U0155, U0402, U0416, U0423

DTC Code DTC Name
U0073 Control Module Communication Bus "A" Off
U0101 Lost Communication with TCM
U0122 Lost Communication with Vehicle Dynamics Control Module
U0155 Lost Communication with Instrument Panel Cluster (IPC) Control Module
U0402 Invalid Data Received from TCM
U0416 Invalid Data Received from Vehicle Dynamics Control Module
U0423 Invalid Data Received from Instrument Panel Cluster Control Module

DESCRIPTION

Refer to CAN communication system for system description Click here.

DTC No. DTC Detection Conditions Trouble Areas
U0073

Bus off state for 0.436 seconds or more

(1 trip detection logic)

  • Wire harness (CANL and CANH circuits)

  • ECM
U0101

No communication between ECM and TCM for 0.5 seconds or more

(1 trip detection logic)

  • Wire harness (CANL and CANH circuits)

  • ECM

  • TCM
U0122

No communication between ECM and skid control ECU for 0.5 seconds or more

(1 trip detection logic)

  • Wire harness (CANL and CANH circuits)

  • ECM

  • Brake actuator assembly
U0155

No communication between ECM and combination meter assembly for 0.5 seconds or more

(1 trip detection logic)

  • Wire harness (CANL and CANH circuits)

  • ECM

  • Combination meter assembly
U0402

Invalid data received from TCM for 2 seconds or more

(1 trip detection logic)

  • Wire harness (CANL and CANH circuits)

  • ECM

  • TCM
U0416

Invalid data received from skid control ECU for 2 seconds or more

(1 trip detection logic)

  • Wire harness (CANL and CANH circuits)

  • ECM

  • Brake actuator assembly
U0423

Invalid data received from combination meter assembly for 2 seconds or more

(1 trip detection logic)

  • Wire harness (CANL and CANH circuits)

  • ECM

  • Combination meter assembly

MONITOR DESCRIPTION

The ECM, TCM, skid control ECU and combination meter assembly communicate with each other via the CAN communication line. If there is a problem in this communication, the ECM stores the DTC.

CAUTION / NOTICE / HINT

Go to CAN communication system for troubleshooting Click here.

Tech Tips


  • When DTCs indicating a CAN communication system malfunction are output, repair the CAN communication system before repairing each corresponding sensor.

  • Read freeze frame data using the GTS. The ECM records vehicle and driving condition information as freeze frame data the moment a DTC is stored. When troubleshooting, freeze frame data can help determine if the vehicle was moving or stationary, if the engine was warmed up or not, if the air-fuel ratio was lean or rich, and other data from the time the malfunction occurred.

  • If the CAN communication malfunctions, there is no data output from the ECM. In this case, some of the freeze frame data are not correct and not identical with the ECM data, but the ECM data are correct.

PROCEDURE


  1. CHECK ANY OTHER DTCS OUTPUT


    1. Connect the GTS to the DLC3.

    2. Turn the ignition switch to ON.

    3. Turn the GTS on.

    4. Enter the following menus: Powertrain / Engine / Trouble Codes.

    5. Read the DTCs.

      Result
      Result Proceed to
      DTC U0073, U0101, U0122, U0155, U0402, U0416 or U0423 is output A
      DTC U0073, U0101, U0122, U0155, U0402, U0416 or U0423 and other DTCs are output B

    A

    GO TO CAN COMMUNICATION SYSTEM Click here

    B

    GO TO DTC CHART Click here