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TROUBLESHOOTING <OSS-ECU> KEYLESS OPERATION SYSTEM (KOS) 42B-77 3. OSS-ECU diagnosis code recheck Code No. U1190: No receive fault detect signal CAUTION • If the diagnosis code No. U1190 is set, diag- nose 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 JUDGEMENT CRITERIA Check Conditions • When all the following conditions are met. a. Power supply mode: ON Judgment Criterion • After the following condition is met, 5,000 ms or more have elapsed. a. CAN signal from the ETACS-ECU cannot be received. PROBABLE CAUSES • Malfunction of the CAN bus line • Malfunction of ETACS-ECU • Malfunction of OSS-ECU DIAGNOSIS PROCEDURE STEP 1. M.U.T.-III CAN bus diagnostics Q: Is the check result normal? YES : Go to Step 2. NO : Repair the CAN bus line (Refer to GROUP − Troubleshooting ). STEP 2. M.U.T.-III other system diagnosis code Q: Is the diagnosis code set? YES : Diagnose the ETACS-ECU (Refer to GROUP 54A, Troubleshooting ). NO : Go to Step 3. STEP 3. M.U.T.-III other system diagnosis code Q: Is the diagnosis code set? YES : Replace the ETACS-ECU. NO : Go to Step 4. STEP 4. Diagnosis code recheck position to the ON position. (3) Check if the diagnosis code is set. Q: Is the diagnosis code set? YES : Replace the OSS-ECU. NO : Intermittent malfunction is suspected (Refer − How to Use Troubleshooting/Inspection Service Points − How to cope with Intermittent Malfunction ). Code No. U1195 Coding not completed CAUTION • If diagnosis code No. U1195 is set, diagnose the CAN bus lines. • When replacing the ECU, always check that the communication circuit is normal. DIAGNOSTIC FUNCTION When the coding data is not registered, OSS-ECU JUDGEMENT CRITERIA Check Conditions • When all the following conditions are met. a. Coding is not completed. of ignition status signal (ON or during crank- Judgment Criterion • Any of the coding is not completed normally. |