AT1–90 AT340E (2JZ–GE) AUTOMATIC TRANSMISSION – TROUBLESHOOTING 4 Check O/D main switch. C 1. Disconnect the O/D main switch connector. 2. Measure resistance between terminals 2 and 4 of O/D main switch connector. OK O/D Main Switch Resistance ON ∞ Ω (open) OFF 0 Ω (continuity) AT5529 OK NG Replace O/D main switch. Check and replace combination meter. (See combination meter troubleshooting section on page BE–41). O/D OFF indicator light remains ON 1 Check O/D main switch. OK NG Replace O/D main switch. 2 Check harness and connector between O/D off indicator light and ECM (See page IN–30). OK NG Repair or replace harness or connector. Check and replace ECM. O/D OFF indicator light blinks Do diagnostic trouble code check (See page AT1–52).