Table G No Communication With EBCM/EBTCM

"No Communication With EBCM/EBTCM" (Part 1 Of 2):

"No Communication With EBCM/EBTCM" (Part 2 Of 2):

No Communication W/EBCM/EBTCM Schematic:

CIRCUIT DESCRIPTION
The UART serial data link allows information to be exchanged from module to module as needed. This is done by the PCM the PCM requests and sends all the information that is transmitted on the UART line. When a scan tool is connected to the UART line, it takes over for the PCM and sends and requests the needed information.

DIAGNOSTIC AIDS
- It is very important that a thorough inspection of the wiring and connectors be performed. Failure to carefully and fully inspect wiring and connectors may result in misdiagnosis, causing part replacement with reappearance of the malfunction.

TABLE TEST DESCRIPTION
The numbers below refer to step numbers on the diagnostic table.
3. Checks for a good ground.
5. Checks for voltage at terminal A.
7. Checks for voltage at terminal D.
9. Checks for voltage at terminal E.
11. Checks the UART line for continuity between the EBCM/EBTCM and the data link.