Code No.U1110
A/C CAN timeout/Not equipped
caution |
- If the diagnosis
code No. U0164 is set, be sure to diagnose the CAN bus line.
- When replacing the ECU, always check that the communication circuit is normal.
|
DIAGNOSTIC FUNCTION
If the signal from A/C-ECU cannot be received, the combination meter sets the
diagnosis code No. U1110.
JUDGEMENT CRITERIA
With the ignition switch is at ON position, the diagnosis code No. U1190 is not stored
and the diagnosis code No. U1195 is not stored, if the communication with A/C-ECU cannot be
established for 2500 ms or more, the combination meter determines that a problem has occurred.
PROBABLE CAUSES
- Malfunction of CAN bus line
- Malfunction of the A/C-ECU
- Malfunction of combination meter
DIAGNOSIS PROCEDURE
STEP 1. M.U.T.-III CAN bus diagnostics
Use the M.U.T.-III to diagnose the CAN bus lines.
Q.
Is the check result normal?
Go to Step 2.
Repair the CAN bus line (Refer to GROUP 54C -
Troubleshooting
).
Repair the CAN bus line and go to Step 6.
STEP 2. M.U.T.-III other system diagnosis code
Check if diagnosis code is set to the A/C-ECU.
Q.
Is the diagnosis code set?
Troubleshoot the A/C-ECU (Refer to GROUP 55B -
Troubleshooting
).
Go to Step 3.
STEP 3. M.U.T.-III other system diagnosis code
Check if a diagnosis code, which relates to CAN communication-linked systems below, is
set.
ETACS-ECU
- Code No. U1110: A/C CAN timeout/Not equipped
Q.
Is the diagnosis code set?
Go to Step 4.
Go to Step 5.
STEP 4. Check whether the diagnosis code is reset.
Recheck if the diagnosis code is set.
|
(1)Erase the diagnosis code.
|
|
(2)Turn the ignition switch to "ON" position.
|
|
(3)On completion, check that the diagnosis code is not reset.
|
Q.
Is the diagnosis code set?
Replace A/C-ECU and then go to Step 6.
A poor connection, open circuit or other intermittent malfunction is present in
the CAN bus lines between the A/C-ECU and the combination meter (Refer to GROUP 00 -
How
to use troubleshooting/Inspection Service Points
).
STEP 5. Check whether the diagnosis code is reset.
Recheck if the diagnosis code is set.
|
(1)Erase the diagnosis code.
|
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(2)Turn the ignition switch to "ON" position.
|
|
(3)On completion, check that the diagnosis code is not reset.
|
Q.
Is the diagnosis code set?
Replace combination meter and then go to Step 6.
A poor connection, open circuit or other intermittent malfunction is present in
the CAN bus lines between the A/C-ECU and the combination meter (Refer to GROUP 00 -
How
to use troubleshooting/Inspection Service Points
).
STEP 6. Check whether the diagnosis code is reset.
Recheck if the diagnosis code is set.
|
(1)Erase the diagnosis code.
|
|
(2)Turn the ignition switch to "ON" position.
|
|
(3)On completion, check that the diagnosis code is not reset.
|
Q.
Is the diagnosis code set?
Go to Step 1.
The procedure is complete.