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Diagnosis & Repair

WARNING: This page is about a different car, the 2003 Lexus SC 430. However, it is still accessible from the selected car via links, so may be relevant.
  1. Measure the voltage between terminal E1 and FPR of E6 and E3 ECM connectors. See Fig 1. With STA signal on, 9-14 volts should be present. With STA signal OFF, 0-3 volts should be present. If okay, go to next step. If not okay, check and replace ECM.
    Fig 1: Checking At ECM FPR Terminal
    G00239964Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
  2. Remove fuel pump relay from engine room No. 2 relay block. Continuity should always be present between terminals No. 1 and 2. No continuity should be present between terminals No. 3 and 4. With battery voltage applied between terminals No. 1 and 2, continuity should be present between terminals No. 3 and 4. See Fig 2. Replace relay as necessary. If okay, go to next step.
    Fig 2: Checking Fuel Pump Relay
    G00239965Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
  3. Disconnect the E6 ECM connector. Check the continuity between the wire harness side connectors. Continuity should be present between fuel pump relay terminal No. 1 of relay block and +FPR (E6-15) terminals. No continuity should be present between fuel pump relay terminal No. 1 of relay block or +FPR (E6-15) - E1 (E3-7) terminals. See Fig 3. Repair wiring as necessary. If okay, check and replace ECM.
    Fig 3: Checking Wiring Between Fuel Pump Relay & ECM
    G00239966Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
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