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Diagnosis & Repair

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. Turn ignition off. Access ECM behind glove box. Using DVOM, backprobe ECM harness connector and measure voltage between ground and terminal No. 1 (Black/Red wire) at ECM harness connector E10. See Figure. If voltage is 9-14 volts, replace ECM. If voltage is not 9-14 volts, go to next step.
    2. NOTE: EFI fuse may also be referred to as ECD fuse.
  2. Remove and inspect EFI fuse. EFI fuse is located in engine compartment fuse box. If fuse is blown, check for short to ground in wiring between EFI fuse and ECM. 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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