Diagnosis code No.21 Meter failure information
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If diagnosis code No.21 is set in the ETACS-ECU, diagnose the CAN bus lines.
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Whenever the ECU is replaced, ensure that the input and output signal circuits are normal.
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The ETACS-ECU receives vehicle speed-related signal from the combination meter via the CAN bus lines. If failure information is sent to the vehicle speed-related signal, diagnosis code No.21 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, the engine-A/T-ECU <A/T> or the engine-ECU <M/T>, the combination meter, the ETACS-ECU or the output shaft speed sensor may be defective.
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Past trouble
- If diagnosis code 21 is stored as a past trouble, carry out diagnosis with particular emphasis on wiring and connector(s) between the engine-A/T-ECU <A/T> or engine-ECU <M/T> and the output shaft speed sensor. 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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- Malfunction of the engine-A/T-ECU <A/T> or engine-ECU <M/T>
- Defective combination meter
- Malfunction of the ETACS-ECU
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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 6.
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Step 2. M.U.T.-III diagnosis code
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Check whether the combination meter-related diagnosis code is set.
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Q.
Is the diagnosis code set?
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Diagnose the combination meter (Refer to GROUP 54A - Troubleshooting ).
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Go to Step 3.
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Step 3. M.U.T.-III 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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- Multi-centre display
U1113: Combination meter failure information diagnosis code
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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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Check again if the diagnosis code is set.
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(1)Erase the diagnosis code.
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(2)Ignition switch: LOCK (OFF) position to 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 engine-A/T-ECU <A/T> or the engine-ECU <M/T> and the output shaft speed sensor (Refer to GROUP 00 - How to Use Troubleshooting/Inspection Service Points ).
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Replace the combination meter, 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)Ignition switch: LOCK (OFF) position to 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 engine-A/T-ECU <A/T> or the engine-ECU <M/T> and the output shaft speed sensor (Refer to GROUP 00 - How to Use Troubleshooting/Inspection Service Points ).
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Replace the ETACS-ECU, 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)Ignition switch: LOCK (OFF) position to 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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