Scan Tool Problems (DLC No. 3 Inspection)
WARNING: This page is about a different car, the 2003 Lexus RX 300. However, it is still accessible from the selected car via links, so may be relevant.
- If scan tool displays UNABLE TO CONNECT TO VEHICLE when scan tool is connected, try scan tool on another vehicle. If scan tool operates on another vehicle, go to next step. If scan tool does not operate on another vehicle, problem is probably with scan tool.
- Check DLC No. 3 for loose or damaged terminals. Ensure DLC No. 3 terminals are in correct position in connector. See ENGINE PERFORMANCE in WIRING DIAGRAMS article in ELECTRICAL. Repair as necessary. If connector and terminals are okay, go to next step.
- Check voltage and resistance between ground and specified terminal on DLC No. 3. See DLC NO. 3 VOLTAGE & RESISTANCE SPECIFICATIONS table. See Fig 1. If voltage and resistance readings are not as specified, check wiring circuit. See ENGINE PERFORMANCE in WIRING DIAGRAMS article in ELECTRICAL.
DLC NO. 3 VOLTAGE & RESISTANCE SPECIFICATIONS
| Terminal No. (Application) | Specification | ||
|---|---|---|---|
| 4 (Chassis Ground) | One Ohm Or Less | ||
| 5 (Signal) | One Ohm Or Less | ||
| 7 (BUS+ Line) | (1) | ||
| 16 (Battery Voltage) | 9-14 Volts | ||
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