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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 ABS-ECU via the CAN-bus line. If KOS-ECU
cannot receive the information about the wheel speed sensor from ABS-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 ABS-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. M.U.T.-III CAN bus diagnostics
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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. Check for other diagnostic trouble code.
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Check if the diagnostic trouble code is set from ABS-ECU <Refer to GROUP 35B,diagnostic
trouble code chart >.
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Q.
Is the check result normal?
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Go to Step 4.
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Carry out the troubleshooting for ABS-ECU <Refer to GROUP 35B, diagnostic
trouble code chart >. Then go to Step 5.
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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 ETACS-ECU (Refer to GROUP 54A -
diagnostic
trouble code chart ).
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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 5.
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Carry out the troubleshooting (Refer to GROUP 54A -
diagnostic trouble
code chart ). Then go to Step 5.
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STEP 5. Recheck for diagnostic trouble code.
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Check again if the DTC is set.
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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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Q.
Is the DTC U1412 reset?
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Start over at Step 1.
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The procedure is complete.
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