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 98 (MULTIPLEX CONTROL SYSTEMS)SELF-DIAGNOSTIC SYSTEMRETRIEVING DIAGNOSTIC TROUBLE CODESUSING TOYOTA HAND-HELD TESTER
2004 Toyota Matrix XR, FWD, Standard
Using Toyota Hand-Held Tester
2004 Toyota Matrix XR, FWD, StandardSECTION Using Toyota Hand-Held Tester
WARNING: This page is about a different car, the 2002 Toyota Avalon. However, it is still accessible from the selected car via links, so may be relevant.
- See scan tool operator's manual for specific operating instructions. Connect scan tool to DLC3 located under left side of instrument panel. See Fig 1. If scan tool cannot communicate with DLC3 diagnostic line when ignition is turned on and scan tool is operated, there is a problem either on vehicle side or tool side of the link. If communication can be established when scan tool is connected to another vehicle, inspect diagnostic circuit (TC line-Light Green/Red wire) of DLC3 circuit in original vehicle. See COMPUTER DATA LINES in SYSTEM WIRING DIAGRAMS article. If communication is still impossible when scan tool is connected to another vehicle, problem is probably in scan tool itself. Consult the Service Department listed in tool's instruction manual. When communication is established, use scan tool to retrieve DTCs. See tester operator's manual for specific operating instructions. Retrieve and record DTCs. Clear DTCs. See CLEARING DIAGNOSTIC TROUBLE CODES .
- Operate system for which complaint was recorded to see if symptom can be recreated. Again retrieve and record DTCs. If same DTC is displayed and symptom is present, problem is current in diagnostic circuit; diagnose and repair DTC. See DIAGNOSTIC TROUBLE CODE INDEX table. If same DTC is not received and no symptoms are present, original DTC was a history code signifying that problem occurred in circuit some time in the past or is a secondary problem. If same DTC is not received, but symptom is still present, problem is still occurring somewhere other than current diagnostic circuit. Diagnose and repair problem based on existing symptoms as follows:
- For symptoms related to engine performance, see TROUBLE SHOOTING - NO CODES article in ENGINE PERFORMANCE.
- For symptoms related to body control system, see BODY CONTROL SYSTEMS - AVALON article under COMMUNICATION DEVICES in ACCESSORIES & EQUIPMENT.
- For symptoms related to driver or passenger door control system, see BODY CONTROL SYSTEMS - AVALON article under COMMUNICATION DEVICES in ACCESSORIES & EQUIPMENT.
- For symptoms related to theft deterrent system, see ANTI-THEFT SYSTEMS - AVALON article under DOOR LOCKS & ANTI-THEFT SYSTEMS in ACCESSORIES & EQUIPMENT.
- For symptoms related to power seats, see POWER SEATS - AVALON article under SEATS in ACCESSORIES & EQUIPMENT.
- If same DTC is not received and symptom is not present, fault may have occurred in wire harness or connector in the past. Check connectors for loose, damaged or corroded terminals.
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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.