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HOMESERVICE MANUALSTOYOTA2003PRIUSREPAIR AND DIAGNOSISENGINE PERFORMANCETESTING & DIAGNOSISENGINE CONTROL SYSTEM SELF DIAGNOSTICSSCAN TOOL PROBLEMSDATA LINK CONNECTOR INSPECTION
2003 Toyota Prius

Data Link Connector Inspection

2003 Toyota PriusSECTION Data Link Connector Inspection
  1. If Toyota hand-held tester or scan tool displays UNABLE TO CONNECT TO VEHICLE when hand-held tester or scan tool is connected to Data Link Connector (DLC3), try hand-held tester or scan tool on another vehicle. If hand-held tester or scan tool operates on another vehicle, go to next step. If hand-held tester or scan tool does not operate on another vehicle, problem is probably with hand-held tester or scan tool.
  2. Check voltage and resistance between ground and specified terminal on DLC3. See DATA LINK CONNECTOR VOLTAGE & RESISTANCE SPECIFICATIONS . See Fig 1. If voltage or resistance readings are not within specification, check wiring circuit. See ENGINE PERFORMANCE in SYSTEM WIRING DIAGRAMS article in ELECTRICAL. For full wiring diagram of DLC3, it may be necessary to see DATA LINK CONNECTORS in SYSTEM WIRING DIAGRAMS article in ELECTRICAL.
    DATA LINK CONNECTOR VOLTAGE & RESISTANCE SPECIFICATIONS

    Terminal No. (Circuit) Specification
    4 (Chassis Ground) 1 Ohm Or Less
    5 (Signal Ground) 1 Ohm Or Less
    7 (BUS Communication) (1)
    16 (Battery Voltage) 9-14 Volts
    (1) Pulse generation should exist during information transmission from Engine Control Module (ECM).
    Fig 1: Identifying Data Link Connector Terminals
    G00015576Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
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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.