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Tacoma & 4Runner

  1. If using scan tool, go to next step. If scan tool is not available, go to step  3.
  2. Check operation of fuel pump by using scan tool. See FUEL PUMP OPERATION under FUEL SYSTEMS in BASIC DIAGNOSTIC PROCEDURES - 4-CYLINDER article. If fuel pump does not operate when using scan tool, go to step  5. If fuel pump operates when using scan tool, check start signal circuit. See STARTER SIGNAL CIRCUIT .
  3. Remove glove box for access to Engine Control Module (ECM). For illustration of ECM location, see THEORY & OPERATION article. Note ECM terminals. See Figure-Figure .
  4. Turn ignition on. Momentarily connect jumper wire between body ground and FC terminal at ECM and listen for fuel pump operating sound. See ECM IDENTIFICATION FOR FUEL PUMP FC TERMINAL (TACOMA & 4RUNNER)  table. Feel for fuel pressure in fuel return line from fuel pressure regulator when fuel return line is pinched closed. If fuel pump does not operate when jumper wire was connected, go to next step. If fuel pump operates when jumper wire was connected, check starter signal circuit. See STARTER SIGNAL CIRCUIT .
  5. Check ECM power source circuit. See ENGINE CONTROL MODULE (ECM) POWER SOURCE CIRCUIT . If ECM power source circuit is okay, go to next step. If ECM power source circuit is defective, repair as necessary.
  6. Check circuit opening relay. See CIRCUIT OPENING RELAY  under RELAYS. If circuit opening relay is okay, go to next step. If circuit opening relay is defective, replace circuit opening relay.
  7. Remove glove box for access to ECM if not previously done. Note ECM terminals. See Figure-Figure .
  8. Turn ignition on. Using voltmeter, check voltage between body ground and FC terminal at ECM. See ECM IDENTIFICATION FOR FUEL PUMP FC TERMINAL (TACOMA & 4RUNNER)  table.
    ECM IDENTIFICATION FOR FUEL PUMP FC TERMINAL (TACOMA & 4RUNNER)

    Application ECM Connector ECM Terminal No. (Wire Color)
    Tacoma
    Calif. Emission Vehicles E6 6 (Green/Yellow)
    Except Calif. Emission Vehicles E8 14 (Green/Yellow)
    4Runner
    Calif. Emission Vehicles E7 6 (Green/Yellow)
    Except Calif. Emission Vehicles E5 14 (Green/Yellow)
  9. Voltage should be 9-14 volts. If voltage is within specification, go to next step. If voltage is not within specification, check for open in wiring harness and electrical connectors between EFI main relay and circuit opening relay, and between circuit opening relay and ECM. See WIRING DIAGRAMS article. For EFI main relay location, see EFI MAIN RELAY  under RELAYS. If wiring harness or electrical connector is defective, repair as necessary.
  10. Check fuel pump resistance and operation. See FUEL DELIVERY  under FUEL SYSTEMS. If fuel pump resistance is within specification and fuel pump operates, go to next step. If fuel pump resistance is not within specification or fuel pump does not operate, replace fuel pump.
  11. Check for open in wiring harness and electrical connectors between circuit opening relay and fuel pump, and between fuel pump and body ground. See WIRING DIAGRAMS article. If wiring harness and electrical connectors are okay, go to next step. If wiring harness or electrical connector is defective, repair as necessary.
  12. Check ECM ground circuit. See WIRING DIAGRAMS article. If ECM ground circuit is defective, repair ground circuit as necessary. If ECM ground circuit is okay, replace ECM.
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