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DTC U1190: No receive fault detect signal
 
 
caution
  • If DTC U1190 is set, diagnose the CAN bus lines.
  • When replacing the ECU, always check that the communication circuit is normal.
 
 
JUDGMENT CRITERIA
ETACS-ECU sends the DTC (U code) detection permission or prohibition signal to each ECU connected to the CAN bus line. If the gateway-ECU cannot receive the DTC (U code) detection permission or prohibition signal for 5 seconds after turning the ignition switch to "ON" position, DTC U1190 will be set.
 
 
TROUBLESHOOTING HINTS
  • Malfunction of the ETACS-ECU
  • Malfunction of CAN bus line
  • Malfunction of the gateway-ECU
 
 
DIAGNOSIS
STEP 1. Using scan tool MB991958, diagnose the CAN bus line
(1)
cautionTo prevent damage to scan tool MB991958, always turn the ignition switch to the "LOCK" (OFF) position before connecting or disconnecting scan tool MB991958.
Connect scan tool MB991958. Refer to "How to connect the Scan Tool (M.U.T.-III) ."
(2) Turn the ignition switch to the "ON" position.
(3) Diagnose the CAN bus line.
(4) Turn the ignition switch to the "LOCK" (OFF) position.
Is the CAN bus line found to be normal?
Go to Step 2.
Repair the CAN bus line (Refer to ).
 
STEP 2. Using scan tool MB991958, read the EPS-ECU diagnostic trouble code
Check if DTC is set in the EPS-ECU.
Is the DTC set?
Replace the ETACS-ECU (Refer to GROUP 54A - ETACS ).
Go to Step 3.
 
STEP 3. Recheck for diagnostic trouble code.
Recheck if the DTC is set.
(1) Erase the DTC.
(2) Turn the ignition switch to "ON" position.
(3) On completion, check that the DTC is not set again.
Is the DTC set?
Replace the gateway-ECU (Refer to ).
Intermittent malfunction is suspected (Refer to GROUP 00 - How to Use Troubleshooting/Inspection Service Points - How to cope with Intermittent Malfunction ).