Code No. U0164: A/C CAN time-out
caution |
- If diagnosis code No. U0164 is stored, be sure to diagnose the CAN bus line.
- When replacing the ECU, always check that the communication circuit is normal.
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DIAGNOSTIC FUNCTION
If the signal from heater controller assembly (A/C-ECU) cannot be received, the electric tailgate control unit stores diagnosis code No. U0164.
JUDGEMENT CRITERIA
With the statuses that the ignition switch is at ON position, system voltage is 10 to 16 V (data from ETACS-ECU), and there is no malfunction to the power supply fuse, or odometer value is 80.5 km or more, if the communication with heater controller assembly (A/C-ECU) cannot be established for 2,500 ms or more, the electric tailgate control unit determines that a problem has occurred.
PROBABLE CAUSES
- Malfunction of heater controller assembly (A/C-ECU)
- Malfunction of the electric tailgate control unit
- Malfunction of CAN bus line
DIAGNOSIS PROCEDURE
STEP 1. M.U.T.-III CAN bus diagnostics
Use M.U.T.-III to diagnose the CAN bus lines.
Q.
Is the check result normal?
Go to Step 2.
Repair the CAN bus lines. (Refer to GROUP 54C - Troubleshooting
.)
STEP 2. M.U.T.-III diagnosis code for other systems
Check if the heater controller assembly (A/C-ECU)-related diagnosis code is stored.
Q.
Is the diagnosis code stored?
Perform troubleshooting for heater controller assembly (A/C-ECU). (Refer to GROUP 55 - Troubleshooting
.)
Go to Step 3.
STEP 3. M.U.T.-III other system diagnosis code
Check if the diagnosis code No. U0164 is stored to the KOS-ECU, OSS-ECU, combination meter, ETACS-ECU, MMCS or radio and CD player.
Q.
Is the diagnosis code stored?
Go to Step 4.
Go to Step 5.
STEP 4. Check whether the diagnosis code is stored again.
Check again if the electric tailgate control unit stores a diagnosis code.
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(1)Erase the diagnosis code.
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(2)Turn the ignition switch from "LOCK" (OFF) position to "ON" position.
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(3)Check if diagnosis code is stored.
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Q.
Is the diagnosis code stored?
Replace the heater controller assembly (A/C-ECU).
An intermittent malfunction may be present. (Refer to GROUP 00 - How to Use Troubleshooting/Inspection Service Points - How to Cope with Intermittent Malfunction
.)
STEP 5. Check whether the diagnosis code is stored again.
Check again if the electric tailgate control unit stores a diagnosis code.
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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 stored.
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Q.
Is the diagnosis code stored?
Replace the electric tailgate control unit.
An intermittent malfunction may be present. (Refer to GROUP 00 - How to Use Troubleshooting/Inspection Service Points - How to Cope with Intermittent Malfunction
.)