Checking Fuel Pump Operation Using Toyota Hand-Held Tester (Sequoia & Tundra 4.7L V8)
WARNING: This page does not describe the selected car, but rather 10 other vehicles, including the 2002 Toyota Tundra, 2002 Toyota Tacoma, 2002 Toyota Sienna, 2002 Toyota Sequoia, and 2002 Toyota Land Cruiser. However, it is still accessible from the selected car via links, so may be relevant.
- Connect hand-held tester to data link connector No. 3 at driver's side of instrument panel. See Figure and Figure . Turn ignition on. DO NOT start engine.
- Turn hand-held tester on. Select ACTIVE TEST MODE on hand-held tester. Using hand-held tester manufacturer's instructions, operate fuel pump. Note location of fuel pressure pulsation damper located at firewall end of driver's side fuel rail. See Fig 1. Fuel pressure pulsation damper may also be referred to as pulsation damper.
- Listen for fuel pump operating sound and check that screw at center of fuel pressure pulsation damper moves upward due to the fuel pressure. See Fig 1. If fuel pump operates, check fuel pressure. See FUEL PRESSURE .
- If fuel pump does not operate, EFI main relay, fuel pump relay or circuit opening relay may be defective. For relay application and explanation of relay operation, see FUEL PUMP CONTROL CIRCUIT . For testing of EFI main relay, fuel pump relay or circuit opening relay, see appropriate relay under MODULES, MOTORS, RELAYS & SOLENOIDS in SYSTEM & COMPONENT TESTING - V6 & V8 article. If problem exists in fuel pump relay or control circuit, Diagnostic Trouble Code (DTC) P1200 may be stored in Engine Control Module (ECM). See TESTING PROCEDURE under SELF-DIAGNOSTIC SYSTEM in appropriate SELF-DIAGNOSTICS article for retrieving of DTCs.
- If relays are okay, check for defective fuses, fusible links or wiring. See WIRING DIAGRAMS
article. If fuses, fusible links and wiring are okay, check for defective fuel pump. See CHECKING FUEL PUMP OPERATION BY APPLYING BATTERY VOLTAGE TO FUEL PUMP (SEQUOIA & TUNDRA) procedure. If fuel pump operates properly, Engine Control Module (ECM) may be defective. It maybe necessary to check fuel pump resistor. See FUEL PUMP RESISTOR (SEQUOIA & TACOMA 4.7L V8)
under FUEL DELIVERY under FUEL SYSTEMS in SYSTEM & COMPONENT TESTING - V6 & V8 article.NOTE: On Sequoia, for additional testing information for fuel pump control circuit, see FUEL PUMP CONTROL CIRCUIT under COMPUTERIZED ENGINE CONTROLS in SYSTEM & COMPONENT TESTING - V6 & V8 article.