Checking Fuel Pump Operation Using Toyota Hand-Held Tester (Land Cruiser)
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- Connect hand-held tester to data link connector No. 3 at driver's side of instrument panel. See Fig 1. 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. Disconnect fuel return hose from clamp on V-bank cover. Remove 2 bolts, nuts and V-bank cover. V-bank cover must be removed for access to fuel pressure pulsation damper located at firewall end of driver's side fuel rail. See Fig 2. 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 fuel pressure. See Fig 2. If fuel pump operates, check fuel pressure. See FUEL PRESSURE .
- If fuel pump does not operate, EFI main relay, ECM or fuel pump switch may be defective, or fuel pump switch may need to be reset. For explanation of EFI main relay, ECM and fuel pump switch operation, or resetting of fuel pump switch, see FUEL PUMP CONTROL CIRCUIT . For testing of EFI main relay, see EFI MAIN RELAY under MODULES, MOTORS, RELAYS & SOLENOIDS in SYSTEM & COMPONENT TESTING - V6 & V8 article. For testing of fuel pump switch, see FUEL DELIVERY under FUEL SYSTEMS in SYSTEM & COMPONENT TESTING - V6 & V8 article.
- If EFI main relay and fuel pump switch are okay, check for defective fuses or wiring. See appropriate SYSTEM WIRING DIAGRAMS article in ELECTRICAL. If fuses and wiring are okay, check for defective fuel pump. See CHECKING FUEL PUMP OPERATION BY APPLYING BATTERY VOLTAGE TO FUEL PUMP (AVALON, CAMRY SOLARA, HIGHLANDER, LAND CRUISER, SIENNA, TACOMA & 4RUNNER) procedure. If problem exists in fuel pump control circuit, Diagnostic Trouble Code (DTC) P0230 may be stored in Engine Control Module (ECM). See TESTING PROCEDURE under SELF-DIAGNOSTIC SYSTEM in appropriate SELF-DIAGNOSTICS article for retrieving of DTCs.
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