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.
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HOMESERVICE MANUALSTOYOTA2004MATRIX XR, FWD, STANDARDREPAIR AND DIAGNOSISEXTERNAL PAGESDIFFERENT CARSECTION 239 (ENGINE CONTROL SYSTEM SELF-DIAGNOSTICS - 4 CYL (PZEV))SCAN TOOL PROBLEMSDATA LINK CONNECTOR NO. 3 INSPECTION
2004 Toyota Matrix XR, FWD, Standard
Data Link Connector No. 3 Inspection
2004 Toyota Matrix XR, FWD, StandardSECTION Data Link Connector No. 3 Inspection
WARNING: This page is about a different car, the 2003 Toyota Camry. However, it is still accessible from the selected car via links, so may be relevant.
- If the display shows UNABLE TO CONNECT TO VEHICLE when you have connected the cable of the OBD II scan tool or the hand-held tester to the DLC3, located under left side of instrument panel, left of steering column, turned the ignition switch ON and operated the scan tool, there is a problem on the vehicle side or tool side. See Figure. If the communication is normal when the tool is connected to another vehicle, inspect the DLC3 on the original vehicle. If the communication is still impossible when the tool is connected to another vehicle, the problem is probably in the tool itself, so consult the Service Department listed in the tool's instruction manual.
- Check DLC3 for loose or damaged terminals. See Fig 1. Ensure DLC3 terminals are in correct position in connector. Repair as necessary. If connector and terminals are okay, go to next step.
- Check voltage and resistance between ground and specified terminal on DLC3. See DATA LINK CONNECTOR NO. 3 VOLTAGE & RESISTANCE SPECIFICATIONSΒ table. If voltage and resistance readings are not as specified, check wiring circuit.
NOTE:
The vehicle's Engine Control Module (ECM) uses the ISO 9141-2 for communication protocol. The terminal arrangement of DLC3 complies with SAE J1962 and matches the ISO 9141-2 format.
DATA LINK CONNECTOR NO. 3 VOLTAGE & RESISTANCE SPECIFICATIONS
| Terminal No. (Circuit) | Resistance | Condition | ||
|---|---|---|---|---|
| 4 (Chassis Ground) - Body Ground | Less Than 1 Ξ© | Always | ||
| 5 (Signal Ground) - Body Ground | Less Than 1 Ξ© | Always | ||
| 7 (BUS Communication) - 5 (Signal Ground) | (1) | During Transmission | ||
| 16 (Battery Voltage) - Body Ground | 9-14 V | Always | ||
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When to See a Mechanic
Stop DIY work and contact a certified mechanic immediately if any of the following apply:
- β’ You smell fuel, burning insulation, or see smoke.
- β’ Brakes feel soft, pull hard to one side, or make grinding noises.
- β’ The engine overheats, stalls repeatedly, or misfires under load.
- β’ You are missing required tools, torque specs, or safe lifting equipment.
- β’ You are not confident in the next step or safety outcome.