U1412

U1412-IMPLAUSIBLE VEHICLE SPEED SIGNAL RECEIVED





For the Engine circuit diagram, Refer to SCHEMATICS AND DIAGRAMS.

When Monitored
Ignition on.

Set Condition
The PCM gets an implausible signal over the CAN C circuit from the ABS Module or FCM (NON-ABS). The circuit is continuously monitored.

Possible Causes
- CAN C BUS CIRCUIT SHORTED
- CAN C BUS CIRCUIT OPEN
- ABS MODULE
- PCM

Always perform the Pre-Diagnostic Troubleshooting procedure before proceeding.

Theory of Operation
The ABS Module or FCM (NON-ABS) sends vehicle speed information over the CAN C Bus circuit to the PCM.

Diagnostic Test
1. ACTIVE DTC





NOTE: Diagnose all CAN B and C communication failures before continuing.

Ignition on, engine not running.
With a scan tool, read DTCs.
Is the U1412-IMPLAUSIBLE VEHICLE SPEED SIGNAL RECEIVED active at this time?
Yes >> Go To 2
No >> Refer to the INTERMITTENT CONDITION Diagnostic Procedure.
Perform (NGC) POWERTRAIN VERIFICATION TEST VER - 5. Powertrain Verification Test - Ver 5
2. U0001-NO COMMUNICATION ON THE CAN C BUS CIRCUIT IS ACTIVE
Continue reading DTCs.
Is the U0001-NO COMMUNICATION ON THE CAN C BUS CIRCUIT ACTIVE at this time?
Yes >> Refer to the Diagnostic Procedure for the U0001-NO COMMUNICATION ON THE CAN C BUS CIRCUIT
No >> Go To 3
3. ABS MODULE IS ACTIVE ON THE CAN C BUS
With the scan tool, select ECU View.
Verify that the ABS Module is active on the bus.

Is the ABS Module active on the bus?
Yes >> Go To 4
No >> Refer to ELECTRONIC CONTROL MODULES for No Response diagnostic procedures.
Perform BODY VERIFICATION TEST VER - 1. Body Verification Test
4. ACTIVE DTCS IN THE FCM
With the scan tool, select ECU View and select FCM.
With the scan tool, read active DTCs.

Is the U0001-NO COMMUNICATION ON THE CAN C BUS CIRCUIT ACTIVE in the FCM at this time?
Yes >> Refer to ELECTRONIC CONTROL MODULES for U0001 diagnostic procedures.
Perform BODY VERIFICATION TEST VER - 1. Body Verification Test
No >> Replace and program the Powertrain Control Module per Service Information.
Perform POWERTRAIN VERIFICATION TEST - VER 5.