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Diagnosis & Repair

WARNING: This page is about a different car, the 2003 Lexus LX 470. However, it is still accessible from the selected car via links, so may be relevant.
  1. Remove the glove compartment door. Start the engine. Measure the voltage between terminal FPR of the ECM connector and body ground while racing the engine. See Fig 1. If voltage is 4.5-5.5 volts, check and replace ECM. If voltage is not 4.5-5.5 volts, go to next step.
    Fig 1: Measuring Voltage Between Ground & ECM Connector Terminal FPR
    G00239857Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
  2. Check operation of EFI main relay. See EFI MAIN RELAY under FUEL SYSTEM in SYSTEM & COMPONENT TESTING - LX470 article. Replace as necessary. If okay, go to next step.
  3. Check operation of C/OPN relay. See EFI MAIN RELAY under FUEL SYSTEM in SYSTEM & COMPONENT TESTING - LX470 article. Replace as necessary. If relay is okay, go to next step.
  4. Check fuel pump. See FUEL DELIVERY under FUEL SYSTEM in SYSTEM & COMPONENT TESTING - LX470 article. Replace fuel pump as necessary. If okay, repair or replace harness or connector between fuel pump relay and ECM.
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