Code No. U1190: CAN trouble detection control signal reception not possible


caution
  • If the EPS-ECU sets the diagnosis code No. U1190, diagnose the CAN bus lines. If there is any fault in the CAN bus lines, an incorrect diagnosis code may be set.
  • Before replacing ECU, ensure that the communication circuit is normal.

TROUBLE JUDGEMENT



COMMENT ON TROUBLE SYMPTOM


Current trouble
  • The ETACS-ECU free-run counter, ETACS-ECU itself, or EPS-ECU itself may be faulty.
Past trouble
  • Carry out diagnosis with particular emphasis on wiring harness and connectors relevant to the ETACS-ECU (free-run counter-related). For diagnosis procedures, refer to "How to Cope with Historic Trouble" (GROUP 00 - How to Use Troubleshooting/Inspection Service Points ).

PROBABLE CAUSES



  • Defective harness wire(s) or connector(s)
  • The ETACS-ECU may be defective
  • Malfunction of the EPS-ECU

DIAGNOSIS PROCEDURE


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



Q. Is the check result satisfactory?





STEP 2. Use M.U.T.-III to confirm a diagnosis code of other systems.



Q. Is the diagnosis code set?





STEP 3. Diagnosis code recheck



(1)Turn the electric motor switch from LOCK (OFF) to "ON" position, and then wait for 5 seconds.
(2)Check if the diagnosis code No. U1190 is set as a current trouble.

Q. Is diagnosis code C1190 set?





STEP 4. Diagnosis code recheck



(1)Turn the electric motor switch to the "LOCK" (OFF) → "ON" position.
(2)Check if the diagnosis code No. U1190 is set as a current trouble.

Q. Is diagnosis code C1190 set?