Diagnostic Mode Switch/Connector: Description and Operation

Service Check, Data Link, And Memory Eraser Short Connectors:

DESCRIPTION
The Service Check Connector is used to trigger the self diagnostic capabilities of the Programmed Fuel Injection Electronic Control Module (PGM-FI ECM).

OPERATION
By connecting the Service Check Connector terminals with a jumper wire as shown, the PGM-FI ECM will begin to indicate any stored Data Trouble Codes.

CAUTION: DO NOT connect the jumper wire to the three pin Data Link Connector which is next to the Service Check Connector.