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Diagnosis & Repair (Using OBD-II Scan Tool) - ES300

  1. Access ECM harness connectors behind glove box. Backprobing ECM harness connector, measure voltage between ground and terminal No. 7 (Gray wire) STA at ECM E7 connector. See Figure.
  2. Turn ignition switch to START position. With starter being cranked, voltage should be 6 volts or more. If voltage is not as specified, go to next step. If voltage is as specified, no problem is indicated at this time. Diagnose by symptom. See TROUBLE SHOOTING - NO CODES article.
  3. 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.
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