Ford Crown Victoria/Grand Marquis 1989-1998

Diagnostic Link Connector


Some of the vehicles covered by this guide utilize two Diagnostic Link Connectors (DLCs), both of which are in the same vicinity.

The Diagnostic Link Connector(s) (DLC) may be found in the following location:

Under the hood near the firewall behind the driver's side strut tower.

The DLC is rectangular in design and capable of allowing access to 16 terminals. The connector has keying features that allow easy connection. The test equipment and the DLC have a latching feature to ensure a good mated connection.


Although stored codes may be read through the flashing of the CHECK ENGINE or SERVICE ENGINE SOON lamp, the use of hand-held scan tools such as Ford's Self-Test Automatic Readout (STAR) tester or the second generation SUPER STAR II tester or their equivalent is highly recommended. There are many manufacturers of these tools; the purchaser must be certain that the tool is proper for the intended use.

The scan tool allows any stored faults to be read from the engine controller memory. Use of the scan tool provides additional data during troubleshooting, but does not eliminate the use of the charts. The scan tool makes collecting information easier, but the data must be correctly interpreted by an operator familiar with the system.

See Figures 1, 2, 3 and 4

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Fig. Fig. 1: Super Star II tester -Ford Motor Co.

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Fig. Fig. 2: Inexpensive scan tools, such as this Auto Xray ®, are available to interface with your Ford vehicle

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Fig. Fig. 3: An economically friendly alternative is this Code Scanner ® from SunPro. They are purchased according to manufacturer and are available at many parts stores