7000 - 7999: 7200

7200-LOST COMMUNICATION WITH ECM/PCM

For a complete wiring diagram consult Diagrams/Electrical Electrical Diagrams.


- When Monitored:
- With the ignition on
- Battery voltage between 10 and 16 volts
- IOD fuse installed
- BCM is configured correctly
- Set Condition:

Bus messages not received from the ECM/PCM for approximately 500 ms.








Diagnostic Test


1. VERIFY DTC IS ACTIVE

NOTE: Ensure the IOD fuse is installed and battery voltage is between 10 and 16 volts before proceeding.

With the scan tool, read active DTCs.

Is this DTC active?

Yes

- Go To 2

No

- Refer to the Stored Lost Communication test procedure.
- Perform BODY VERIFICATION TEST - VER 1. Verification Tests



2. CHECK FOR ANY OF THE FOLLOWING ACTIVE DTCS

With the scan tool, read all active DTCs from all modules.


NOTE: Check for BCM configuration, CAN B or C hardware electrical, VIN Missing/Mismatch, battery or ignition related DTCs.

Does the scan tool display any active DTCs to the conditions listed above?

Yes

- Diagnose and repair the DTC.
- Perform BODY VERIFICATION TEST - VER 1. Verification Tests

No

- Go To 3



3. VERIFY THAT THE ECM/PCM IS ACTIVE ON THE BUS

Turn the ignition on.

With the scan tool, select Network Diagnostics.

Verify that the ECM/PCM is active on the bus.

Is the ECM/PCM active on the bus?

Yes

- Go To 4

No

- Refer to Manufacturer Trouble Codes for a no response test procedure.
- Perform BODY VERIFICATION TEST - VER 1. Verification Tests



4. CHECK FOR ADDITIONAL COMMUNICATION RELATED DTCS

With the scan tool, select Network Diagnostics.

Is there more than one module with active DTCs "Logged Against" the ECM/PCM?

Yes

- Replace/update the ECM/PCM.
- Perform BODY VERIFICATION TEST - VER 1. Verification Tests

No

- Replace/update the module that set this DTC.
- Perform BODY VERIFICATION TEST - VER 1. Verification Tests