U1412

U1412-IMPLAUSIBLE VEHICLE SPEED SIGNAL RECEIVED
For a complete wiring diagram, refer to the Wiring Information.
Theory of Operation

The ABS Module sends vehicle speed information over the CAN C Bus circuit to the Powertrain Control Module (PCM).

- When Monitored:
Continuously with the ignition on.

- Set Condition:
The Powertrain Control Module (PCM) gets an implausible signal over the CAN C circuit from the ABS Module.





Always perform the Pre-Diagnostic Troubleshooting procedure before proceeding. Pre-Diagnostic Troubleshooting Procedure.

1. ACTIVE DTC
1. Ignition on, engine not running.
2. With a scan tool, read DTCs.

Is the U1412-IMPLAUSIBLE VEHICLE SPEED SIGNAL RECEIVED active at this time?

Yes

- Go To 2

No

- Perform the INTERMITTENT CONDITION diagnostic procedure. Intermittent Condition Test

2. U0001-NO COMMUNICATION ON THE CAN C BUS CIRCUIT IS ACTIVE
1. Continue reading DTCs.

Is the U0001-NO COMMUNICATION ON THE CAN C BUS CIRCUIT ACTIVE at this time?

Yes

- Testing and Inspection Perform the U0001-NO COMMUNICATION ON THE CAN C BUS CIRCUIT diagnostic procedure.

No

- Go To 3

3. ABS MODULE IS ACTIVE ON THE CAN C BUS
1. With the scan tool, select ECU View.
2. Verify that the ABS Module active on the bus.

Is the ABS Module active on the bus?

Yes

- Go To 4

No

- No Response From ABS (Antilock Brake Module) Perform the No Response from ABS diagnostic procedure.
- Perform the BODY VERIFICATION TEST. Body Verification Test.

4. ACTIVE DTCs IN THE TIPM
1. With the scan tool, select ECU View and select TIPM.
2. With the scan tool, read active DTCs.

Is the U0001-NO COMMUNICATION ON THE CAN C BUS CIRCUIT ACTIVE in the TIPM at this time?

Yes

- Replace the ABS Module.
- Perform the ABS VERIFICATION TEST. ABS Verification Test.

No

- Replace and program the Powertrain Control Module.
- Perform the POWERTRAIN VERIFICATION TEST - 6.7L. Powertrain Verification Test.