Code No.U1130 Failures Information on A/C-ECU


caution If diagnosis code U1130 is set in the multi display station, always diagnose the CAN bus lines.

TROUBLE JUDGMENT



COMMENTS ON TROUBLE SYMPTOM


Current trouble
  • The A/C-ECU or the multi display station may be defective.
Past trouble
  • Carry out diagnosis with particular emphasis on connector(s) or wiring harness between the A/C-ECU and the multi display station. For diagnosis procedures, refer to "How to treat past trouble" (Refer to GROUP 00, How to Use Troubleshooting/Inspection Service Points ).

POSSIBLE CAUSES



  • Damaged harness wires and connectors
  • Malfunction of A/C-ECU
  • Malfunction of multi display station

DIAGNOSIS PROCEDURE


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



Q. Is the check result satisfactory?





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



Q. Is the diagnosis code set?





STEP 3. Check whether the diagnosis code is reset.



(1)Replace the multi display station temporarily.
(2)Erase the diagnosis code.
(3)Turn the ignition switch to "ON" position.
(4)Check if the diagnosis code is set.

Q. Is the check result satisfactory?





STEP 4. Check whether the diagnosis code is reset.



(1)Replace the A/C-ECU temporarily.
(2)Erase the diagnosis code.
(3)Turn the ignition Switch to "ON" position.
(4)Check if the diagnosis code is set.

Q. Is the check result satisfactory?





STEP 5. Check whether the diagnosis code is reset.



(1)Erase the diagnosis code.
(2)Turn the ignition switch to "ON" position.
(3)Check if the diagnosis code is set.

Q. Is the check result satisfactory?