Code No.U0164
A/C CAN timeout
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caution |
- If the diagnosis
code No. U0164 is set, be sure to diagnose the CAN bus line.
- When replacing the radio and CD player, always check that the communication circuit
is normal.
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If the signal from heater controller assembly (A/C-ECU) cannot be received, the
radio and CD player sets the diagnosis code No. U0164.
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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 A/C-ECU cannot be established for
2,500 ms or more, the radio and CD player determines that a problem has occurred.
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- Malfunction of CAN bus line
- Malfunction of heater controller assembly
- Malfunction of radio and CD player
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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 if diagnosis code is set to the A/C-ECU.
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Q.
Is the diagnosis code set?
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Troubleshoot the A/C-ECU (Refer to GROUP 55 - Troubleshooting ),
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. U0164 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 to the radio and CD player.
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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 heater controller assembly.
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A poor connection, open circuit or other intermittent malfunction in the CAN bus
line between the radio and CD player and the heater controller assembly (A/C-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 reset.
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Check again if the diagnosis code is set to the radio and CD player.
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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 radio and CD player.
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A poor connection, open circuit or other intermittent malfunction in the CAN bus
line between the radio and CD player and the heater controller assembly (A/C-ECU).
(Refer to GROUP 00 - How to Use Troubleshooting/Inspection Service Points
- How to Cope with Intermittent Malfunction .)
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