7000 - 7999: 7204

7204-IMPLAUSIBLE MESSAGE RECEIVED FROM ECM

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 Engine Controller.





1. CHECK FOR DTC 7204-IMPLAUSIBLE MESSAGE RECEIVED FROM ECM

NOTE: This DTC must be active for the results of this test to be valid.

1. Turn the ignition on.
2. With the scan tool, record and erase DTCs.
3. Cycle the ignition switch from off to on.
4. With the scan tool, read DTCs.

Does the scan tool display: 7204-IMPLAUSIBLE MESSAGE RECEIVED FROM ECM?

Yes

- Go To 2

No

- Perform the ABS-INTERMITTENT CONDITION diagnostic procedure Testing and Inspection.

2. 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 3

3. CHECK IF ENGINE DTCS ARE PRESENT
1. With the scan tool, read ECM DTCs.

Are there any Engine DTCs present?

Yes

- Perform the appropriate diagnostic procedure.Testing and Inspection
- Perform the ECM VERIFICATION TEST. ECM Verification Test.

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. ABS Verification Test.