Circuit Description
The data link connector (DLC) provides operating power for the scan tool at terminal 16 (battery positive voltage) and at terminal 4 (ground). The DLC provides the class 2 serial data signal at terminal 2 and signal ground at terminal 5. The scan tool will power up with the ignition OFF.
Test Description
Step number(s) below refer to the same step number(s) in the Diagnostic Table
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The CIGAR fuse supplies power to the DLC terminal 16.
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The DLC battery positive voltage and ground circuits are functioning properly. The malfunction must be due to the scan tool.
Step | Action | Yes | No |
|---|---|---|---|
Refer to Data Link Connector Schematics | |||
Test the DLC battery positive voltage circuit for an open or a short to ground. Refer to Circuit Testing and Wiring Repairs in Wiring Systems. Did you find and correct the condition? | Go to Step 2 | ||
2 | Test the DLC ground circuit terminal 4 for an open. Refer to Circuit Testing and Wiring Repairs in Wiring Systems. Did you find and correct the condition? | Go to Step 3 | |
3 | Inspect for poor connections at the DLC terminals 4 and 16. Refer to Testing for Intermittent Conditions and Poor Connections and Connector Repairs in Wiring Systems. Did you find and correct the condition? | Go to Step 4 | |
The scan tool may be malfunctioning. Refer to the scan tool instruction manual. Did you obtain a properly operating scan tool? | -- | ||
