Safety Warning
DIY auto repair can cause serious injury, fire, or vehicle damage. These guides are for informational purposes only. Always follow OEM torque specs, wear PPE, and consult a certified mechanic if you are unsure. You are solely responsible for your safety.
SYS.OK|MANUAL.DB● LIVE
HOMESERVICE MANUALSLEXUS1998GS 300REPAIR AND DIAGNOSISENGINE PERFORMANCESYSTEMENGINE CONTROLS - TESTS W/CODESSCAN TOOL PROBLEMSDLC NO. 3 INSPECTION
1998 Lexus GS 300
DLC No. 3 Inspection
1998 Lexus GS 300SECTION DLC No. 3 Inspection
- 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 appropriate wiring diagram in SYSTEM 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 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 appropriate wiring diagram in SYSTEM WIRING DIAGRAMS article.
NOTE:
Terminal No. 2 on DLC No. 3 provides the pulse generation during the information transmission from the Engine Control Module (ECM).
DLC NO. 3 VOLTAGE & RESISTANCE SPECIFICATIONS
| Pin No. (Application) | Specification |
|---|---|
| 4 (Chassis Ground) | One Ohm or Less |
| 5 (Signal) | One Ohm or Less |
| 16 (Battery Voltage) | 9-14 Volts |
RENDER: 1.0x
NO RELATED
Recommended Tools & Savings
Use the Manual With the Right Hardware
Pair factory procedures with proven DIY tools so the instructions are easier to execute.
Affiliate disclosure: We may earn a commission at no extra cost to you.
When to See a Mechanic
Stop DIY work and contact a certified mechanic immediately if any of the following apply:
- • You smell fuel, burning insulation, or see smoke.
- • Brakes feel soft, pull hard to one side, or make grinding noises.
- • The engine overheats, stalls repeatedly, or misfires under load.
- • You are missing required tools, torque specs, or safe lifting equipment.
- • You are not confident in the next step or safety outcome.