STOP AND START SYSTEM, Diagnostic DTC:U0100, U0114, U0121, U0126, U0151, U0155, U0164

DTC Code DTC Name
U0100 Lost Communication with ECM / PCM "A"
U0114 Lost Communication with Four-Wheel Drive Clutch Control Module
U0121 Lost Communication with Anti-lock Brake System (ABS) Control Module
U0126 Lost Communication with Steering Angle Sensor Module
U0151 Lost Communication with SRS Airbag ECU
U0155 Lost Communication with Instrument Panel Cluster Control Module (Combination Meter)
U0164 Lost Communication with HVAC Control Module

DESCRIPTION

The engine stop and start ECU communicates with the ECD system, vehicle stability control system, air conditioning system, airbag system, combination meter assembly and 4 wheel drive control ECU via CAN communication.

If there is a communication error between the engine stop and start ECU and any of the systems, the engine stop and start ECU stores DTCs and illuminates the stop and start cancel indicator light except when there is a communication error with the meter/gauge system.

Tech Tips


  • When there is an open in the output side of the backup boost converter (built into the engine stop and start ECU), power to the system with the open is cut off. The engine stop and start ECU stores CAN communication DTCs for the system with the open and stop and start system DTC P323B.

  • When the backup boost converter (built into the engine stop and start ECU) detects overcurrent in any of the circuits it supplies power to, it shuts off the circuit. The engine stop and start ECU stores CAN communication DTCs for the system which circuit was shut off and stores stop and start system DTC B22C0.

DTC No. Detection Item DTC Detection Condition Trouble Area Warning Indicate Memory
U0100 Lost Communication with ECM / PCM "A" No communication between the engine stop and start ECU and ECM for 0.92 seconds.

  • Wire harness or connector

  • Engine stop and start ECU

  • ECM

 Blinks DTC stored
U0114 Lost Communication with Four-Wheel Drive Clutch Control Module No communication between the engine stop and start ECU and 4 wheel drive control ECU for 0.92 seconds.

  • Wire harness or connector

  • Engine stop and start ECU

  • 4 wheel drive control ECU

 Blinks DTC stored
U0121 Lost Communication with Anti-lock Brake System (ABS) Control Module No communication between the engine stop and start ECU and skid control ECU (brake actuator assembly) for 2.4 seconds.

  • Wire harness or connector

  • Engine stop and start ECU

  • Skid control ECU (Brake actuator assembly)

 Blinks DTC stored
U0126 Lost Communication with Steering Angle Sensor Module No communication between the engine stop and start ECU and spiral with sensor cable sub-assembly for 0.72 seconds.

  • Wire harness or connector

  • Engine stop and start ECU

  • Spiral with sensor cable sub-assembly

 Blinks DTC stored
U0151 Lost Communication with SRS Airbag ECU No communication between the engine stop and start ECU and airbag sensor assembly for 10.6 seconds.

  • Wire harness or connector

  • Engine stop and start ECU

  • Airbag sensor assembly

 Blinks DTC stored
U0155 Lost Communication with Instrument Panel Cluster Control Module (Combination Meter) No communication between the engine stop and start ECU and the combination meter assembly for 3.6 seconds.

  • Wire harness or connector

  • Engine stop and start ECU

  • Combination meter assembly

 Blinks DTC stored
U0164 Lost Communication with HVAC Control Module No communication between the engine stop and start ECU and air conditioning amplifier assembly for 10.6 seconds.

  • Wire harness or connector

  • Engine stop and start ECU

  • Air conditioning amplifier assembly

 Blinks DTC stored

CAUTION / NOTICE / HINT

Tech Tips

If any of CAN communication system DTCs and sensor malfunction DTCs related to the CAN communication system are output simultaneously, perform troubleshooting for the CAN communication system DTCs first, then for the sensor malfunction DTCs.

PROCEDURE


  1. CLEAR DTC


    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 / Stop and Start / Trouble Codes.

    5. Clear the DTCs.


      Powertrain > Stop and Start > Clear DTCs
      Result
      Proceed to
      NEXT

    NEXT

  2. CHECK DTC OUTPUT


    1. Turn the ignition switch off and wait for 30 seconds or more.

    2. Turn the ignition switch to ON.

    3. Start the engine.

    4. Perform a road test.

    5. Enter the following menus: Powertrain / Stop and Start / Trouble Codes.

    6. Read the DTCs.


      Powertrain > Stop and Start > Trouble Codes
      Result
      Result Proceed to
      DTC U0100, U0114, U0121, U0126, U0151, U0155 or U0164 is output A
      DTC U0100, U0114, U0121, U0126, U0151, U0155 or U0164 is not output B

    A

    GO TO CAN COMMUNICATION SYSTEM for LHD (w/ Centrl Gateway ECU) Click here for RHD (w/ Centrl Gateway ECU) Click here for LHD (w/o Centrl Gateway ECU) Click here for RHD (w/o Centrl Gateway ECU) Click here

    B

    USE SIMULATION METHOD TO CHECK Click here