Pinpoint Test Al: Lost Communication With APIM: Notes
Normal Operation and Fault Conditions
The RCM uses information contained in messages from the APIM sent on the HS-CAN2.
PPT AL RCM DTC FAULT TRIGGER CONDITIONS
| DTC | Description | Fault Trigger Conditions |
|---|---|---|
| U0253:00 | Lost Communication with Accessory Protocol Interface Module: No Sub Type Information | This DTC sets if the RCM does not receive an expected message from the APIM. |
Possible Causes
- Network communication concern
- RCM concern
- APIM
NOTE:
Most faults are due to connector and/or wiring concerns. Carry out a thorough inspection and verification before proceeding with the pinpoint test.
NOTE:
Only disconnect or reconnect SRS components when instructed to do so within a pinpoint test step. Failure to follow this instruction may result in incorrect diagnosis of the SRS.
NOTE:
Always make sure the correct SRS component is being installed. Parts released for other vehicles may not be compatible even if they appear physically similar. Check the part number listed in the Ford parts catalog to make sure the correct component is being installed. If an incorrect SRS component is installed, DTCs may set.