Code No.U1112:
SRS-ECU Time-out
| caution |
If diagnosis code U1112 is set in the combination meter,
always diagnose the CAN bus lines.
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| caution |
Whenever the ECU is replaced, ensure that the communication
circuit is normal.
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The combination meter communicates with the SRS-ECU through CAN bus lines. If it can not
receive all the necessary signals from the SRS-ECU, diagnosis code U1112 is set.
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COMMENTS ON TROUBLE SYMPTOM
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Current trouble
- Connector(s) or wiring harness in the CAN bus lines between the SRS-ECU and the
combination meter, the power supply system to the SRS-ECU, the SRS-ECU itself, or the combination
meter may be defective.
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Past trouble
- Carry out diagnosis with particular emphasis on connector(s) or wiring harness in
the CAN bus lines between the SRS-ECU and the combination meter, and the power supply system
to the SRS-ECU. For diagnosis procedures, refer to "How to cope with past trouble" (Refer to
GROUP 00, How to Use Troubleshooting/Inspection Service Points
 ).
| note |
For a past trouble, you may 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 - How to Cope with Intermittent Malfunctions ).
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, Explanation about the M.U.T.-III CAN Bus Diagnostics ).
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- Damaged harness wires and connectors
- Malfunction of SRS-ECU
- Malfunction of combination meter
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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 satisfactory?
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 Go to Step 2.
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 Repair the CAN bus lines (Refer to GROUP 54F, Diagnosis - Can Bus Diagnostics
Table ). On completion, go to Step 4.
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Step 2. M.U.T.-III other system diagnosis code
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Check that the SRS-ECU sets a diagnosis code.
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Q.
Is the diagnosis code set?
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Diagnose the SRS. Refer to GROUP 52B, Troubleshooting - Check Chart for
Diagnosis Code <except vehicles for Hong Kong, Singapore, Australia
and New Zealand>, <vehicles for Hong Kong
and Singapore>, <vehicles for Australia and
New Zealand>.
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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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Recheck if the diagnosis code is set.
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(1)Erase the diagnosis code.
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(2)Turn the ignition switch to "ON" position.
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(3)Check if the diagnosis code is set.
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Q.
Is the check result satisfactory?
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A poor connection, open circuit or other intermittent malfunction is present in
the lines between the SRS-ECU and the combination meter (Refer to GROUP 00, How to Use Troubleshooting/Inspection
Service Points - How to Cope with Intermittent Malfunctions ).
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Replace SRS-ECU and then go to step 4.
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Step 4. 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)Turn the ignition switch to "ON" position.
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(3)Check if the diagnosis code is set.
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Q.
Is the check result satisfactory?
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The procedure is complete.
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Go to Step 1.
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