Posted in MMC L200

U1190 – The Network System Diagnosis Code Output Permitted Signal Can Not Be Received | MMC L200 IV

 Posted by  Posted on September 28, 2020

TROUBLE JUDGEMENT

  • Ignition switch is in “ON” position
  • The diagnosis enable signal from the ETACS-ECU about the abnormal CAN is not received at all for 5 seconds or more after the ignition switch is on.
  • The ETACS-ECU sends the permitted / not permitted signals for detecting the diagnosis code (U-code) to each ECU connected with the CAN bus line. When the engine-ECU cannot receive the permitted / not permitted signals for detecting the diagnosis code (U-code) for 5seconds, the diagnosis code No. U1190 is stored.

    • PROBABLE CAUSES

  • Failed ETACS-ECU
  • Failed CAN bus
  • Failed engine-ECU

    • DIAGNOSIS PROCEDURE

    STEP 1. M.U.T.-III CAN bus diagnostics

  • Using M.U.T.-III perform the CAN bus lines diagnosis.

    • Q. Is the check result normal?

    STEP 2. M.U.T.-III diagnosis code.

  • Reconfirm whether the diagnosis codes are stored in the engine-ECU.
  • Erase the diagnosis codes being stored.
  • Ignition switch: “LOCK” (OFF) to “ON”.
  • Confirm whether the diagnosis codes are stored.

    • Q. Are the diagnosis codes stored?

    STEP 3. M.U.T.-III diagnosis code.

  • Reconfirm whether the diagnosis codes are stored in the engine-ECU.
  • Erase the diagnosis codes being stored.
  • Ignition switch: “LOCK” (OFF) to “ON”.
  • Confirm whether the diagnosis codes are stored.

    • Q. Are the diagnosis codes stored?

    Author: admin