Test S: No Communication with the ECS Module

S1:

S2 - S3:

S4 - S5:

Normal Operation
The ECS will communicate the system fault codes through the scan tool using the Data Link Connector (DLC). If the Scan Tool displays "NO COMMUNICATION" when retrieving continuous Diagnostic Trouble Codes (DTCs), use this pinpoint test to troubleshoot the system.

Possible Causes
^ Damaged wiring on ignition Circuit 298 (P/O).
^ Damaged wiring on Circuit 70 (LB/W).
^ Poor module ground.
^ Scan Tool damaged.
^ Low battery voltage condition.