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Diagnosis & Repair

WARNING: This page is about a different car, the 2002 Lexus ES 300. However, it is still accessible from the selected car via links, so may be relevant.
  1. Turn ignition off. Access ECM behind glove box. Using DVOM, backprobe ECM harness connector and measure voltage between ECM connector E10 terminal No. 28 (Brown wire) and connector E7 terminal No. 2 (Black/Yellow wire). See Figure. If voltage is 9-14 volts, replace ECM. If voltage is not 9-14 volts, go to next step.
  2. Remove and inspect EFI fuse (15-amp). EFI fuse is located in engine compartment fuse box. If fuse is blown, check for short to ground in wiring. See WIRING DIAGRAMS article. Repair as necessary and replace fuse. If fuse is okay, check for open in wiring between EFI fuse and ECM. Repair as necessary.
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