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 UART serial data signal at terminal 9 and signal ground at terminal 5. The DLC also provides the class 2 serial data signal at terminal 2 and signal ground at terminal 5. The DLC also provides the E+C serial data signal at terminal 14 and signal ground at terminal 5. The scan tool will power up with the ignition off.
Test Description
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The CIGAR/DLC 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 |
|---|---|---|---|
Test the DLC battery positive voltage circuit for an open or a short to ground. Refer to Flat Wire Repairs in Wiring Systems. Did you find and correct the condition? | Go to the applicable Diagnostic System Check | ||
2 | Test the DLC ground circuit terminal 4 for an open. Refer to Flat Wire Repairs in Wiring Systems. Did you find and correct the condition? | Go to the applicable Diagnostic System Check | |
3 | Inspect for poor connections/terminal tension at the DLC terminals 4 and 16. Refer to Connector Repairs in Wiring Systems. Did you find and correct the condition? | Go to the applicable Diagnostic System Check | |
The scan tool may be malfunctioning. Refer to the scan tool instruction manual. Did you obtain a properly operating scan tool? | Go to the applicable Diagnostic System Check | -- |
