Code No. U1190: No receive fault detect signal



caution
  • If the diagnosis code No. U1190 is set, diagnose the CAN bus lines.
  • When replacing the ECU, always check that the communication circuit is normal.

DIAGNOSTIC FUNCTION


When the signal from the ETACS-ECU cannot be received, KOS-ECU sets the diagnosis code No.U1190.

JUDGEMENT CRITERIA


Check Conditions
  1. Power supply mode: ON
  2. ETACS-ECU system voltage is at 10 to 16 V.
Judgment Criterion
  1. CAN signal from the ETACS-ECU cannot be received.

PROBABLE CAUSES




DIAGNOSIS PROCEDURE


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


Use the M.U.T.-III to diagnose the CAN bus lines.

Q. Is the check result normal?

Go to Step 2.

Repair the CAN bus line (Refer to GROUP 54C - Troubleshooting ).

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


Check again if the diagnosis code is set to the ETACS-ECU.

Q. Is the diagnosis code set?

Diagnose the ETACS-ECU (Refer to GROUP 54A, Troubleshooting ).

Go to Step 3.

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


Check again if the diagnosis code is set to the ETACS-ECU.

Q. Is the diagnosis code set?

Replace the ETACS-ECU.

Go to Step 4.

STEP 4. Diagnosis code recheck


Check again if the diagnosis code is set to the KOS-ECU.
(1)Erase the diagnosis code.
(2)Turn the engine switch from the LOCK (OFF) position to the ON position.
(3)Check if the diagnosis code is set.

Q. Is the diagnosis code set?

Replace the KOS-ECU.

Intermittent malfunction is suspected (Refer to GROUP 00 - How to Use Troubleshooting/Inspection Service Points - How to cope with Intermittent Malfunction ).