Code No.U1000 OSS CAN timeout
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- If diagnosis code No. U1000 is set, be sure to diagnose the CAN bus line.
- When replacing the CAN box unit, always check that the communication circuit is normal.
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If the signal from OSS-ECU cannot be received, the CAN box unit sets the diagnosis code No. U0230.
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With the statuses that the ignition switch is at ON position, system voltage is 10 - 16 V (data from ETACS-ECU), and there is no malfunction to the power supply fuse (IOD fuse), or odometer value is 80.5 km or more, if the communication with OSS-ECU cannot be established for 2,500 ms or more, the CAN box unit determines that a problem has occurred.
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- Malfunction of CAN bus line
- Malfunction of OSS-ECU
- Malfunction of CAN box unit
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STEP 1. M.U.T.-III CAN bus diagnostics
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Use the M.U.T.-III to diagnose the CAN bus lines.
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Q.
Is the check result normal?
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Go to Step 2.
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Repair the CAN bus line (Refer to GROUP 54C - Troubleshooting ).
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STEP 2. M.U.T.-III other system diagnosis code
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Check again if the diagnosis code is set in the OSS-ECU.
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Q.
Is the diagnosis code set?
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Troubleshoot the OSS-ECU (Refer to GROUP 42B - Diagnosis Code Chart), and then go to Step 3.
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Go to Step 3.
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STEP 3. Check the M.U.T.-III Diagnosis code for other systems
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Check if the diagnosis code No. U1000 is set to ETACS-ECU.
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Q.
Is the diagnosis code set?
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Go to Step 4.
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Go to Step 5.
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STEP 4. Diagnosis code recheck
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Check again if the diagnosis code is set in the CAN box unit.
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(1)Erase the diagnosis code.
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(2)Turn the ignition switch from the "LOCK" (OFF) position to the "ON" position.
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(3)Check if the diagnosis code is set.
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Q.
Is the diagnosis code set?
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Replace the OSS-ECU. (Refer to GROUP 42B - OSS-ECU.)
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A poor connection, open circuit or other intermittent malfunction in the CAN bus line between the CAN box unit and the OSS-ECU. (Refer to GROUP 00 - How to Use Troubleshooting/Inspection Service Points - How to Cope with Intermittent Malfunction.)
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STEP 5. Check whether the diagnosis code is set again.
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Check again if the diagnosis code is set in the CAN box unit.
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(1)Erase the diagnosis code.
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(2)Turn the ignition switch from the "LOCK" (OFF) position to the "ON" position.
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(3)Check if diagnosis code is set.
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Q.
Is the diagnosis code set?
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Replace the CAN box unit.
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A poor connection, open circuit or other intermittent malfunction in the CAN bus line between the CAN box unit and the OSS-ECU. (Refer to GROUP 00 - How to Use Troubleshooting/Inspection Service Points - How to Cope with Intermittent Malfunction.)
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