Posted in Mitsubishi Colt

U1110 – A-C-ECU Time-out MMC Colt

 Posted by  Posted on September 27, 2020

TROUBLE JUDGMENT

  • While the cranking switch is in “OFF” position, or when 3 seconds pass after the cranking switch is in “OFF” from “ON”.
  • The battery voltage is 10 V or more.
  • The signals cannot be received from A/C-ECU through CAN busline.

    • COMMENT ON TROUBLE SYMPTOM

  • The failure is possibly caused by malfunction of the harness and connector in CAN busline between engine-ECU and A/C-ECU or between engine-ECU and A/C-ECU, by malfunction in the power supply system of A/C-ECU, in A/C-ECU itself, in engine-ECU.

    • PROBABLE CAUSES

  • Failed of the harness and the connector
  • Failed A/C-ECU
  • Failed engine-ECU

    • DIAGNOSIS PROCEDURE

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

  • Using M.U.T.-III, perform CAN busline diagnosis.

    • Q. Is the check result normal?

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

  • Confirm whether the diagnosis codes are output from A/C-ECU.

    • Q. Is the diagnosis code output?

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

  • Confirm whether Diagnosis Code U1110 A/C-ECU timeout is output from the following ECU having CAN communication with A/C-ECU.
  • Center display unit
  • Combination meter
  • ETASC-ECU

    • Q. Is the diagnosis code output?

    STEP 4. Reconfirmation of diagnosis codes

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

    • Q. Is the diagnosis code output?

    STEP 5. Reconfirmation of diagnosis codes

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

    • Q. Is the diagnosis code output?

    STEP 6. Reconfirmation of diagnosis codes

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

    • Q. Is the diagnosis code output?

    Author: admin