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Diagnosis & Repair

WARNING: This page is about a different car, the 2002 Lexus RX 300. However, it is still accessible from the selected car via links, so may be relevant.
  1. Access ECM behind glove box. Locate ECM E5 connector. See Figure. Backprobing ECM connector, measure voltage between ground and terminal No. 1 (Black/Yellow wire) at ECM E5 connector. If voltage is not 9-14 volts, go to next step. If voltage is 9-14 volts, replace ECM and retest system.
  2. Remove and inspect EFI fuse (20-amp) from junction block, located in left side of engine compartment. If fuse is blown, check cause of blown fuse and repair as necessary. If fuse is okay, check and repair wiring harness or connector between battery, EFI fuse and ECM.
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