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Diagnosis & Repair (Using OBD-II Scan Tool)

WARNING: This page is about a different car, the 2002 Lexus LX 470. However, it is still accessible from the selected car via links, so may be relevant.
  1. Access ECM behind glove box. Backprobing ECM connector, measure voltage between ground and terminal No. 7 (Black/Red wire) at ECM E9 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 WIRING DIAGRAMS article. Repair as necessary. If wiring is okay, replace ECM and retest.
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