DTC U1412: Implausible Vehicle Speed Signal Received: Diagnosis

WARNING: This page is about a different car, the 2008 Mitsubishi Lancer. However, it is still accessible from the selected car via links, so may be relevant.

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

STEP 1. M.U.T.-III CAN bus diagnostics
Use scan tool to diagnose the CAN bus lines.

Q: Is the check result normal?

YES : Go to Step 3.

NO : Repair the CAN bus lines (Refer to CAN BUS DIAGNOSTICS TABLE ). On completion, go to Step 2.
STEP 2. Diagnostic trouble code recheck after resetting CAN bus lines
1. Turn the ignition switch to the "LOCK" (OFF) position.
2. Turn the ignition switch to the "ON" position.
3. Check if the DTC is set.
4. Turn the ignition switch to the "LOCK" (OFF) position.
Q: Is the DTC U1412 set?

YES : Go to Step 3.

NO : The procedure is complete.
STEP 3. Vehicle speed check by combination meter
During the vehicle driving, check that the correct vehicle speed is displayed on the combination meter.

Q: Is the check result normal?

YES : Replace the WCM and register ID codes (Refer to ID CODES REGISTRATION PROCEDURE .) Then go to Step 6.

NO : Go to Step 4.
STEP 4. Check for other diagnostic trouble code.
Check if the diagnostic trouble code is set from ASC-ECU (Refer to DIAGNOSTIC TROUBLE CODE CHART ).

Q: Is the check result normal?

YES : Go to Step 5.

NO : Carry out the relevant troubleshooting. (Refer to DIAGNOSTIC TROUBLE CODE CHART ). Then go to Step 5.
STEP 5. Check for other diagnostic trouble code.
Check if the diagnostic trouble code is set from ETACS-ECU (Refer to DIAGNOSTIC TROUBLE CODE CHART ).

Q: Is the check result normal?

YES : Diagnose the combination meter. (Refer to DIAGNOSTIC TROUBLE CODE CHART ) Go to Step 6.

NO : Carry out the relevant troubleshooting. (Refer to DIAGNOSTIC TROUBLE CODE CHART ). Then go to Step 6.
STEP 6. Recheck for diagnostic trouble code.
1. Turn the ignition switch to the "LOCK" (OFF) position.
2. Turn the ignition switch to the "ON" position.
3. Check if the DTC is set.
4. Turn the ignition switch to the "LOCK" (OFF) position.
Q: Is the DTC U1412 set?

YES : Start over at Step 1.

NO : The procedure is complete.