October 30: LEMON manuals on a temporary server, it is slow and having issues, download the manuals you need! Later in November we will switch back to the fast server.
Diagnosis & Repair (Using Lexus Scan Tester)
- Connect Lexus scan tester to Data Link Connector (DLC) No. 3. See Figure. Turn scan tester on. Turn ignition on. Using scan tester, read STA signal while cranking starter. With ignition switch in ON position, STA signal should be off. With ignition switch in START position, STA signal should be on. If STA signal is as specified, no problem is detected at this time. Diagnose by symptom. See TROUBLE SHOOTING - NO CODES article. If STA signal is not as specified, go to next step.
- Check for open in wiring harness between ECM and starter relay. See appropriate wiring diagram in WIRING DIAGRAMS article. Repair as necessary. If wiring is okay, replace ECM and retest.