Code No.U1100 Engine-ECU <M/T> or Engine-A/T-ECU <A/T> Time-out (Related to Engine)
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If diagnosis code U1100 or U1101 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 receives engine control system-related signals from the engine-ECU <M/T> or engine-A/T-ECU <A/T> via CAN bus lines. If the display unit can not receives the necessary signals, diagnosis code U1100 will be 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 engine-ECU <M/T> or engine-A/T-ECU <A/T> and the combination meter, the power supply system to the engine-ECU <M/T> or engine-A/T-ECU <A/T>, the engine-ECU <M/T> or engine-A/T-ECU <A/T> 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 engine-ECU <M/T> or engine-A/T-ECU <A/T> and the combination meter, and the power supply system to the engine-ECU <M/T> or engine-A/T-ECU <A/T>. 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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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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caution |
If the ignition switch is turned on without starting the engine and then three minutes passes, the combination meter may store U1102 as past trouble.
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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 ). Repair the CAN bus line and go to Step 6.
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Step 2. M.U.T.-III other system diagnosis code
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Check whether the MPI system and the A/T system diagnosis codes are set or not.
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Q.
Is the diagnosis code set?
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Diagnose MPI system or A/T system. (Refer to GROUP 13A, Troubleshooting or GROUP 13B, Troubleshooting or GROUP 23A, 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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ETACS-ECU
- Code No.U1100: engine-ECU <M/T> or engine-A/T-ECU <A/T> time-out (related to Engine)
A/C-ECU
- Code No.U1100: engine-ECU <M/T> or engine-A/T-ECU <A/T> time-out (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 CAN bus 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 CAN bus 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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