Diagnosis code
No.13 A/C-ECU time-out
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| caution |
If diagnosis code No.13 is
set in the ETACS-ECU, diagnose the CAN bus lines.
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| caution |
Whenever the ECU is replaced, ensure that the input and output
signal circuits are normal.
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The ETACS-ECU receives air conditioner system-related signal from the A/C-ECU.
If air conditioner control system-related signal can not be received at all, diagnosis code
No.13 will be set.
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COMMENT ON TROUBLE SYMPTOM
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Current trouble
- Connector(s) or wiring harness in the CAN bus lines between the A/C-ECU
and the ETACS-ECU, the power supply system to the combination meter, the combination meter itself,
or the ETACS-ECU may be defective.
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Past trouble
- If diagnosis code No.13 is stored as a past trouble, carry out diagnosis with particular
emphasis on wiring and connector(s) in the CAN bus line between the ETACS-ECU and the A/C-ECU,
and the power supply system to the A/C-ECU. For diagnosis procedures, refer to "How
to treat past trouble" (Refer to GROUP 00 - How to Use Troubleshooting/Inspection
Service Points
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| note |
For a past trouble, you can not find it by the M.U.T.-III CAN bus diagnostics even if there
is any failure in CAN bus lines. In this case, refer to GROUP 00, How to Use Troubleshooting/Inspection
Service Points and check the CAN bus lines. You can narrow
down the possible cause of the trouble by referring to the diagnosis code, which is set regarding
the CAN communication-linked ECUs (Refer to GROUP 54F - CAN Bus Line Diagnostic Flow ).
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- Malfunction of the A/C-ECU
- Malfunction of the ETACS-ECU
- Damaged harness wires and connectors
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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 54F - Troubleshooting ).
Repair the CAN bus line and go to Step 5.
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Step 2. M.U.T.-III diagnosis code
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Check if an A/C-ECU diagnosis code is set.
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Q.
Is the diagnosis code set?
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Diagnose the A/C-ECU (Refer to GROUP 55 - Troubleshooting ).
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Go to Step 3.
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Step 3. Check whether the diagnosis code is reset.
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Check again if the diagnosis code is set.
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(1)Erase the diagnosis code.
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(2)Ignition switch: ON → LOCK (OFF) → ON
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(3)On completion, check that the diagnosis code is not reset.
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Q.
Is the check result normal?
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A poor connection, open circuit or other intermittent malfunction is present in
the CAN bus lines between the A/C-ECU and the ETACS-ECU (Refer to GROUP 00 - How
to Use Troubleshooting/Inspection Service Points ).
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Replace the A/C-ECU, and then go to Step 4.
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Step 4. Check whether the diagnosis code is reset.
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Check again if the diagnosis code is set.
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(1)Erase the diagnosis code.
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(2)Ignition switch: ON → LOCK (OFF) → ON
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(3)On completion, check that the diagnosis code is not reset.
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Q.
Is the check result normal?
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A poor connection, open circuit or other intermittent malfunction is present in
the CAN bus lines between the A/C-ECU and the ETACS-ECU (Refer to GROUP 00 - How
to Use Troubleshooting/Inspection Service Points ).
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Replace the ETACS-ECU, and then go to Step 5.
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Step 5. Check whether the diagnosis code is reset.
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Recheck if the diagnosis code is set.
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(1)Erase the diagnosis code.
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(2)Ignition switch: ON → LOCK (OFF) → ON
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(3)On completion, check that the diagnosis code is not reset.
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Q.
Is the check result normal?
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The procedure is complete.
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Return to Step 1.
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