ENGINE CONTROL MODULE PROGRAMMING
An engine immobilizer system is used. If Engine Control Module (ECM) is replaced, ECM must be programmed with proper ignition key code for engine immobilizer system. For programming procedures, see COMPUTER RELEARN PROCEDURES - TOYOTA article in GENERAL INFORMATION, or appropriate ENGINE IMMOBILIZER SYSTEMS article in ACCESSORIES & EQUIPMENT.
Scheme 65
- 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.
- Check voltage and resistance between ground and specified terminal on DLC3. See «DATA LINK CONNECTOR (DLC3) VOLTAGE & RESISTANCE SPECIFICATIONS»(/toyota/land-cruiser/100-2002-2005/remont/testing-diagnostics/#engine-control-system-self-diagnostics-land-cruiser). (Scheme 65) If voltage or resistance 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 (DLC3) 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).