7000 - 7999: 7221

7221-IMPLAUSIBLE MESSAGE RECEIVED FROM TCM

For a complete wiring diagram, Refer to the Wiring Information Electrical Diagrams.

- When Monitored:
Continuously with the ignition on, one valid CAN message received at least once.

- Set Condition:
When the Anti-Lock Brake Module detects an incorrect CAN message from the Transmission Control Module (TCM).





1. CHECK IF BCM CAN BUS DTCS ARE PRESENT
1. With the scan tool, read BCM DTCs.

Are there any BCM CAN BUS DTCs present?

Yes

- Perform the appropriate diagnostic procedure.Testing and Inspection

No

- Go To 2

2. CHECK IF TRANSMISSION DTCS ARE PRESENT
1. With the scan tool, read Transmission DTCs.

Are there any Transmission DTCs present?

Yes

- Perform the appropriate diagnostic procedure.Testing and Inspection

No

- Using the schematics as a guide, check the Anti-Lock Brake Module pins, terminals, and connectors for corrosion, damage, or terminal push out. Pay particular attention to all power and ground circuits. If no problems are found, replace the Anti-Lock Brake Module.
- Perform ABS VERIFICATION TEST. Verification Tests.