Several other on-vehicle items aid in diagnostics.
Data Link Connector (DLC)
The Data Link Connector (DLC) is located under the left side of the instrument panel (figure 6-11). It is a twelve terminal connector wired to the PCM. By connecting a jumper wire between terminals “B” and “A” or connecting the Tech 1 adapter to the DLC, you can gain access to Diagnostic Trouble Codes (DTC).
“Service Throttle Soon” (STS) Lamp
The “Service Throttle Soon” (STS) lamp alerts the driver to problems involving the Accelerator Pedal Position (APP) sensors. If any of the sensors are inoperative or operating out of normal range, the “Service Throttle Soon” lamp will illuminate. Diagnostic Trouble Codes (DTC) may also set, depending on the degree of sensor failure.
