Code No. U1109: ETACS-ECU Time-out


caution If Diagnosis Code U1109 is output from engine-ECU surely perform CAN bus line diagnosis.
caution Replace ECU after certainly confirming that the communication circuits are normal.
note When the diagnosis codes relating to the CAN communication error are set, make sure of the vehicle equipment. When the vehicle is not equipped with the system the engine-ECU communicates to, the diagnosis code is always set. This is not abnormal.

TROUBLE JUDGMENT


Check Condition
  • The diagnosis code setting enabled signal is received from ETACS-ECU.
Judgment Criterion
  • The signals cannot be received from ETACS-ECU for 0.5 second or more.

COMMENT ON TROUBLE SYMPTOM


Current malfunction
  • The failure is possibly caused by malfunction of the harness and connector in CAN bus line between engine-ECU and ETACS-ECU by malfunction in the power supply system of ETACS-ECU, in ETACS-ECU itself, in engine-ECU.
Past malfunction
  • Focus on diagnosing malfunction of the harness and connector in CAN bus line between engine-ECU and ETACS-ECU as well as malfunction in the power supply system of ETACS-ECU. Refer to past trouble (Refer to GROUP 00 - How to Use Troubleshooting/Inspection Service Points - How to Treat Past Trouble ) for the diagnosis procedure.
    note In case of Past trouble, M.U.T.-III CAN bus diagnosis cannot detect the failure even if there is malfunction in CAN bus, so that check CAN bus line in the same way as Intermittent malfunction (Refer to GROUP 00 - How to Use Troubleshooting/Inspection Service Points - How to Cope with Intermittent Malfunctions ). The diagnosis codes being set to each ECU with CAN communication can narrow down the most suspected area (Refer to GROUP 54C - Can Bus Diagnosis Table ).

PROBABLE CAUSES



  • Failed of the harness and the connector
  • Failed ETACS-ECU
  • Failed engine-ECU

DIAGNOSIS PROCEDURE

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

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

Q. Is the check result normal?
Go to Step 2.
Correct CAN bus line (Refer to GROUP 54C - Troubleshooting - CAN Bus Diagnosis Table ), and then go to Step 6.

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

  • Confirm whether the diagnosis codes are output from ETACS-ECU.

Q. Is the diagnosis code set?
Perform the troubleshooting of ETACS-ECU (Refer to GROUP 54B - Diagnostic Code Chart )
NO : Go to Step 3. <A/T>
NO : Go to Step 5. <M/T>

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

  • Confirm whether Diagnosis Code U1109: ETACS-ECU time out is output from the following ECU having CAN communication with automatic transmission.

  1. A/T-ECU

Q. Is the diagnosis code set?
Go to Step 4.
Go to Step 5.

STEP 4. Reconfirmation of diagnosis codes

  • Reconfirm whether the diagnosis codes are output from engine-ECU

  1. Erase the diagnosis codes being set.
  2. Ignition switch: "LOCK" (OFF) to ON
  3. Confirm whether the diagnosis codes are set.

Q. Is the diagnosis code set?
After replacing the ETACS-ECU, go to Step 6.
Intermittent malfunction in CAN bus line between engine-ECU and ETACS-ECU (Refer to GROUP 00 - How to Use Troubleshooting/Inspection Service Points - How to Cope with Intermittent Malfunctions ).

STEP 5. Reconfirmation of diagnosis codes

  • Reconfirm whether the diagnosis codes are output from engine-ECU

  1. Erase the diagnosis codes being set.
  2. Ignition switch: "LOCK" (OFF) to ON
  3. Confirm whether the diagnosis codes are set.

Q. Is the diagnosis code set?
Replace the engine-ECU. When the engine-ECU is replaced, write the chassis number (Refer to GROUP 00 - Precautions Before Service - How to Perform Chassis Number Writing ). After replacing the engine-ECU, register the injector identification code and learn fuel injection (Refer to GROUP 00 - Precautions Before Service - What The Common Rail Engine Learns ). After registering the injector identification code, the vehicle equipped with the DPF carries out the forcible DPF regeneration. (Refer to GROUP 17 - Emission Control - Diesel Particulate Filter (DPF) System - Forcible DPF Regeneration ). and then go to Step 6.
Intermittent malfunction in CAN bus line between engine-ECU and ETACS-ECU (Refer to GROUP 00 - How to Use Troubleshooting/Inspection Service Points - How to Cope with Intermittent Malfunctions ).

STEP 6. Reconfirmation of diagnosis codes

  • Reconfirm whether the diagnosis codes are output from engine-ECU

  1. Erase the diagnosis codes being set.
  2. Ignition switch: "LOCK" (OFF) to ON
  3. Confirm whether the diagnosis codes are set.

Q. Is the diagnosis code set?
Go to Step 1.
The check is end.