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DTC U1190: No receive fault detect signal
 
 
caution
  • If diagnostic trouble 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 stores DTC No.U1190.
 
 
DTC SET CONDITION
Check Conditions
  • When all the following conditions are met.
    1. Power supply mode: ON
    2. ETACS-ECU system voltage is at 10 to 16 V.
Judgment Criterion
  • After the following condition is met, 5,000 ms or more have elapsed.
    1. CAN signal from the ETACS-ECU cannot be received.
 
 
TROUBLESHOOTING HINTS
  • Malfunction of the CAN bus line
  • Malfunction of ETACS-ECU
  • Malfunction of KOS-ECU
 
 
DIAGNOSIS
STEP 1. Using scan tool (M.U.T-III), diagnose the CAN bus line.
(1)
cautionTo prevent damage to scan tool (M.U.T-III), always turn the power supply mode of the engine switch to the OFF position before connecting or disconnecting scan tool (M.U.T-III).
Connect scan tool (M.U.T-III). Refer to "How to connect scan tool (M.U.T.-III) ."
(2) Turn the power supply mode of the engine switch to ON.
(3) Diagnose the CAN bus line.
(4) Turn the power supply mode of the engine switch to OFF.
Is the CAN bus line found to be normal?
Go to Step 2.
Repair the CAN bus line. (Refer to GROUP 54C, Diagnosis ).
 
STEP 2. Using scan tool (M.U.T-III), read the other system diagnostic trouble code.
Check if DTC is set in the ETACS-ECU.
(1)
cautionTo prevent damage to scan tool (M.U.T-III), always turn the power supply mode of the engine switch to the OFF position before connecting or disconnecting scan tool (M.U.T-III).
Connect scan tool (M.U.T-III). Refer to "How to connect scan tool (M.U.T.-III) ."
(2) Erase the DTC.
(3) Turn the power supply mode of the engine switch to ON.
(4) Check if DTC is set.
(5) Turn the power supply mode of the engine switch to OFF.
Is the DTC set?
Perform troubleshooting for ETACS (Refer to GROUP 54A, Troubleshooting ).
Go to Step 3.
 
STEP 3. Using scan tool (M.U.T-III), read the other system diagnostic trouble code.
Check again if DTC is set in the ETACS-ECU.
(1)
cautionTo prevent damage to scan tool (M.U.T-III), always turn the power supply mode of the engine switch to the OFF position before connecting or disconnecting scan tool (M.U.T-III).
Connect scan tool (M.U.T-III). Refer to "How to connect scan tool (M.U.T.-III) ."
(2) Erase the DTC.
(3) Turn the power supply mode of the engine switch to ON.
(4) Check if DTC is set.
(5) Turn the power supply mode of the engine switch to OFF.
Is the DTC set?
Replace the ETACS-ECU.
Go to Step 4.
 
STEP 4. Recheck for diagnostic trouble code.
Check again if the DTC is set in the KOS-ECU.
(1) Erase the DTC.
(2) Turn the power supply mode of the engine switch from OFF to ON.
(3) Check if DTC is set.
(4) Turn the power supply mode of the engine switch from ON to OFF.
Is the DTC 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 ).