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DTC U1412: Implausible Vehicle Speed Signal Received
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If there is any problem in the CAN bus lines, an incorrect diagnostic trouble code may be set. Prior to this diagnosis, diagnose the CAN bus lines (Refer to GROUP 54C, Trouble code diagnosis  ).
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KOS-ECU receives the wheel speed information from ASC-ECU via the CAN-bus line. If KOS-ECU cannot receive the information about the wheel speed sensor from ASC-ECU, this code is set.
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The most likely causes for this DTC to set are:
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- Damaged wiring harness and connector
- Malfunction of ASC-ECU
- Malfunction of KOS-ECU
- Malfunction of ETACS-ECU
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Required Special Tools:
- MB991958 Scan Tool (M.U.T.-III Sub Assembly)
- MB991824: Vehicle Communication Interface (V.C.I.)
- MB991827 M.U.T.-III USB Cable
- MB991910 M.U.T.-III Main Harness A
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STEP 1. Using scan tool MB991958, diagnose the CAN bus lines.
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Use scan tool to diagnose the CAN bus lines.
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Q.
Is the check result normal?
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 Go to Step 3.
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 Repair the CAN bus lines (Refer to GROUP 54C - CAN Bus Diagnostics table ). On completion, go to Step 2.
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STEP 2. Diagnostic trouble code recheck after resetting CAN bus lines
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(1)Turn the ignition switch to the "LOCK" (OFF) position.
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(2)Turn the ignition switch to the "ON" position.
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(3)Check if the DTC is set.
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(4)Turn the ignition switch to the "LOCK" (OFF) position.
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Go to Step 3.
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The procedure is complete.
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STEP 3. Vehicle speed check by combination meter
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When the vehicle is driven, check whether the proper vehicle speed is shown on the combination meter or not.
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Q.
Is the check result normal?
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Replace the KOS-ECU and register ID codes (Refer to ). Then go to Step 6.
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Go to Step 4.
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STEP 4. Check for other diagnostic trouble code.
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Check if the diagnostic trouble code is set from ASC-ECU (Refer to GROUP 35C, diagnostic trouble code chart ).
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Q.
Is the check result normal?
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Go to Step 5.
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Carry out the relevant troubleshooting. (Refer to GROUP 35C, diagnostic trouble code chart ). Then go to Step 5.
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STEP 5. Check for other diagnostic trouble code.
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Check if the diagnostic trouble code is set from ETACS-ECU (Refer to GROUP 54A, ETACS - diagnostic trouble code chart ).
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Q.
Is the check result normal?
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Diagnose the combination meter. (Refer to GROUP 54A, Combination meter - diagnostic trouble code chart ) Go to Step 6.
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Carry out the relevant troubleshooting. (Refer to GROUP 54A, ETACS - diagnostic trouble code chart ). Then go to Step 6.
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STEP 6. Recheck for diagnostic trouble code.
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(1)Turn the ignition switch to the "LOCK" (OFF) position.
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(2)Turn the ignition switch to the "ON" position.
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(3)Check if the DTC is set.
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(4)Turn the ignition switch to the "LOCK" (OFF) position.
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Start over at Step 1.
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The procedure is complete.
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