No Communication With EBTCM

No Communication With EBTCM - Part 1 Of 2:

No Communication With EBTCM - Part 2 Of 2:

CIRCUIT DESCRIPTION
The Keyword 2000 serial data link allows information to be exchanged from module to module as needed. This is done by the ECM, the ECM requests and sends all the information that is transmitted on the Keyword 2000 line. When a scan tool is connected to the Keyword line it takes over for the ECM and sends and requests the needed information.

DIAGNOSTIC AIDS
^ Thoroughly inspect the wiring and the connectors. Failure to carefully and fully inspect the wiring and the connectors can result in misdiagnosis. Misdiagnosis may cause replacement of parts without repairing the malfunction.
^ If an intermittent malfunction exists, refer to Intermittents and Poor Connections Diagnosis in Diagnostic Aids.

TEST DESCRIPTION
The number(s) below refer to the step number(s) on the diagnostic table.
2. This step checks if the scan tool can communicate with other modules on the Keyword 2000 serial data line. If the scan tool can communicate with other modules, then the malfunction is likely with the ignition input, ground or the serial data line to the EBTCM.