DLC-3 Inspection
- If scan tester displays UNABLE TO CONNECT TO VEHICLE when scan tester is connected, try scan tester on another vehicle. If scan tester operates on another vehicle, go to next step. If scan tester does not operate on another vehicle, problem is probably with scan tester.
- Check DLC-3 for loose or damaged terminals. Ensure DLC-3 terminals are in correct position in connector. See appropriate wiring diagram in WIRING DIAGRAMS article. Repair as necessary. If connector and terminals are okay, go to next step.
- Check voltage and resistance between ground and specified terminal on DLC-3. See DLC-3 VOLTAGE & RESISTANCE SPECIFICATIONS table. See Fig 1. If voltage and resistance readings are not as specified, check wiring circuit. See appropriate wiring diagram in WIRING DIAGRAMS article.
NOTE:
Terminal No. 2 on DLC-3 provides the pulse generation during the information transmission from the Engine Control Module (ECM).
DLC-3 VOLTAGE & RESISTANCE SPECIFICATIONS
| Terminal No. (Application) | Specification |
|---|---|
| 4 (Chassis Ground) | Less Than One Ohm |
| 5 (Signal) | Less Than One Ohm |
| 16 (Battery Voltage) | 9-14 Volts |