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DTC U1190 No receive fault detect signal
 
 
caution
  • If there is any problem in the CAN bus lines, an incorrect DTC may be set. Prior to this diagnosis, diagnose the CAN bus lines (Refer to GROUP 54C, CAN Bus Diagnostics Table ).
  • Whenever ECU is replaced, ensure that the CAN bus lines are normal.
 
 
OPERATION
  • A fault detection enabling/inhibiting signal is sent from the ETACS-ECU to the electric power steering-ECU.
 
 
 
TROUBLE JUDGMENT
Check Conditions
  • Ignition switch: ON position
Judgment Criterion
  • When the microcomputer cannot receive any fault detection enabling/inhibiting signal from the ETACS-ECU, it determines that there is a problem in the system.
Fail Safe, Back Up Function
  • The electric power steering-ECU sets DTC No. U1190.
 
 
 
PROBABLE CAUSES
  • Malfunction of CAN bus line
  • Malfunction of the ETACS-ECU
 
 
 
 
DIAGNOSIS
STEP 1. Using scan tool MB991958, diagnose the CAN bus diagnostics
Use scan tool to diagnose the CAN bus lines.
Is the check result normal?
Go to Step 3.
Repair the CAN bus lines (Refer to GROUP 54C - Diagnosis/CAN Bus Diagnostics Table ). On completion, go to Step 2.
 
STEP 2. DTC recheck after resetting CAN bus lines
(1) Erase the DTC.
(2) Turn the ignition switch from the "LOCK" (OFF) position to the "ON" position.
(3) Check if the DTC is set.
Is DTC U1073 set?
Go to Step 3.
This diagnosis is complete.
 
STEP 3. Check whether the DTC is set again.
(1) Erase the DTC.
(2) Turn the ignition switch from the "LOCK" (OFF) position to the "ON" position.
(3) Check if the DTC is set.
Is DTC U1073 set?
Replace the ETACS-ECU (Refer to GROUP 54A - ETACS ).Then go to Step 4.
Intermittent malfunction (Refer to GROUP 00 - How to Use Troubleshooting/How to Cope with Intermittent Malfunctions ).
 
STEP 4. Check whether the DTC is set again.
(1) Erase the DTC.
(2) Turn the ignition switch from the "LOCK" (OFF) position to the "ON" position.
(3) Check if the DTC is set.
Is DTC U1073 set?
Return to Step 1.
This diagnosis is complete.