Test No. 1: Engine Immobilizer Is Not Set (Engine Starts With Ignition Key Code Other Than The Registered Ignition Key Code)
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.
Check Engine Control Module (ECM) ground circuits. See ANTI-THEFT in SYSTEM WIRING DIAGRAMS article. If ground circuits are faulty, repair and retest system. If ground circuits are okay, substitute original ECM with a known-good unit and recheck system operation. If system operates properly, original ECM was defective. If system still does not operate properly, perform ECM pin voltage check. See PIN VOLTAGE TESTS . Check wiring harness and electrical connectors for an intermittent problem. Repair wiring harnesses or connectors as necessary. If voltage values, harnesses and connectors are okay, replace ECM. After repairs have been made, perform confirmation test. See CONFIRMATION TEST .