Diagnosis & Repair
WARNING: This page is about a different car, the 2003 Toyota 4Runner. However, it is still accessible from the selected car via links, so may be relevant.
- Check resistance of throttle control motor. See THROTTLE BODY under IDLE CONTROL SYSTEMS in SYSTEM & COMPONENT TESTING - V6 & V8 article. If throttle control motor is okay, go to next step. If throttle control motor is defective, replace throttle body with throttle control motor as an assembly. See THROTTLE BODY under FUEL SYSTEMS in REMOVAL, OVERHAUL & INSTALLATION - V6 & V8 article.
- Remove glove box for access to ECM with electrical connectors still installed on ECM. See Figure. Disconnect ECM 32-pin connector E6 and throttle body 6-pin connector. Check continuity between ECM 32-pin connector E6 terminals No. 3 (M+) (Red wire) and throttle body 6-pin connector terminal No. 2. Then, check continuity between ECM 32-pin connector E6 terminals No. 2 (M-) (Green wire) and throttle body 6-pin connector terminal No. 1. See Figure. Ensure no continuity exists between ground and either circuit wires. If continuity is as specified, replace ECM. If continuity is not as specified, repair or replace harness wires and/or connectors as necessary. See appropriate WIRING DIAGRAM under ENGINE PERFORMANCE in SYSTEM WIRING DIAGRAMS article.