U1412-IMPLAUSIBLE VEHICLE SPEED SIGNAL RECEIVED

For a complete wiring diagram Refer to Section 8W.

When Monitored:
Ignition on.
Set Condition:
The PCM gets an implausible signal over the CAN C circuit from the ABS Module. The circuit is continuously monitored.

Always perform the Pre-Diagnostic Troubleshooting procedure before proceeding. (Refer to 9 - ENGINE - STANDARD PROCEDURE).

Theory of Operation

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

Diagnostic Test

1. ACTIVE DTC

NOTE: For vehicle communication problems, use the scan tool to refer to the Network Review Screen. The screen depicts a high level view of the vehicle network. Fault and problem areas appear in red. Selecting any of the network components allows access to the source of the problem.

Ignition on, engine not running.
With a scan tool, select View DTCs.

Is the status Active for this DTC?

Yes

Go To 2

Refer to the *CHECKING FOR AN INTERMITTENT DTC Diagnostic Procedure. (Refer to 9 - ENGINE - DIAGNOSIS AND TESTING)
Perform the PCM Verification Test Ver. 1 (Refer to 9 - ENGINE - STANDARD PROCEDURE)

2. DTC U0001-CAN C BUS IS ACTIVE IN THE PCM

With a scan tool, select View DTCs.

Is the DTC U0001-CAN C BUS Active in the PCM?

Yes

Refer to the Diagnostic Procedure for the U0001-CAN C BUS.

Go To 3

3. ABS MODULE IS ACTIVE ON THE CAN C BUS

Using the Network Review Screen on the scan tool, verify that the ABS Module is active on the bus.

Is the ABS Module active on the bus?

Yes

Go To 4

Refer to 8 - ELECTRICAL/ELECTRONIC CONTROL MODULES - DIAGNOSIS AND TESTING for No Response diagnostic procedures.
Perform BODY VERIFICATION TEST – VER 1.

4. DTC U0001-CAN C BUS ACTIVE IN THE FCM

With the scan tool, select View DTCs in the FCM.

Is the DTC U0001-CAN C BUS Active in the FCM?

Yes

Replace the ABS Module in accordance with the Service Information.

Perform the PCM Verification Test Ver. 1 (Refer to 9 - ENGINE - STANDARD PROCEDURE)

Replace and program the Powertrain Control Module (PCM) in accordance with the Service Information.
Perform the PCM Verification Test Ver. 1 (Refer to 9 - ENGINE - STANDARD PROCEDURE)