Code No.U1120
Failure Information on engine-ECU <M/T> or Engine-A/T-ECU
(Related to Engine)
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If diagnosis code U1120 is set in the combination meter,
diagnose the CAN main bus line.
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The combination meter communicates with the engine-ECU <M/T> or
engine-A/T-ECU <A/T> via CAN bus line. If failure information
is sent to the engine-ECU <M/T> or engine-A/T-ECU <A/T>,
diagnosis code U1120 will be set.
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COMMENTS ON TROUBLE SYMPTOM
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Current trouble
- The engine-ECU <M/T> or engine-A/T-ECU <A/T> 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 between
the engine-ECU <M/T> or engine-A/T-ECU <A/T> and
the combination meter. For diagnosis procedures, refer to "How to cope with past trouble" (Refer
to GROUP 00, How to Use Troubleshooting/Inspection Service Points
 ).
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- Damaged harness wires and connectors
- Malfunction of engine-ECU <M/T> or engine-A/T-ECU <A/T>
- 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 6.
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Step 2. M.U.T.-III other system diagnosis code
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Check if an MPI system diagnosis code is set.
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Q.
Is the diagnosis code set?
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Diagnose MPI system. (Refer to GROUP 13A, Troubleshooting or
GROUP 13B, Troubleshooting )
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Go to Step 3.
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Step 3. M.U.T.-III other system diagnosis code
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Check if a diagnosis code, which relates to CAN communication-linked systems below, is
set.
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A/C-ECU
- Code No.U1120: Failure information on engine-ECU <M/T> or
engine-A/T-ECU <A/T> (related to engine)
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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. 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 engine-ECU <M/T> or engine-A/T-ECU <A/T> 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 engine-ECU <M/T> or engine-A/T-ECU <A/T> and
then go to step 6.
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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)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 engine-ECU <M/T> or engine-A/T-ECU <A/T> 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 combination meter and then go to step 6.
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Step 6. 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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