Safety Warning
DIY auto repair can cause serious injury, fire, or vehicle damage. These guides are for informational purposes only. Always follow OEM torque specs, wear PPE, and consult a certified mechanic if you are unsure. You are solely responsible for your safety.
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HOMESERVICE MANUALSTOYOTA1996T100 SR5, 4WD, STANDARDREPAIR AND DIAGNOSIS (SINGLE PAGE)ENGINE PERFORMANCESYSTEMENGINE CONTROLS - BASIC TESTING - 2.7LFUEL SYSTEMFUEL PUMP OPERATIONCHECKING FUEL PUMP OPERATION USING SCAN TESTER
1996 Toyota T100 SR5, 4WD, Standard
Checking Fuel Pump Operation Using Scan Tester
1996 Toyota T100 SR5, 4WD, StandardSECTION Checking Fuel Pump Operation Using Scan Tester
- Remove cover (if equipped) and install scan tester on data link connector No. 3. See Figure. Turn ignition on. DO NOT start engine.
- Using scan tester manufacturer's instructions, activate fuel pump. Listen for fuel pump operating sound and feel for pressure in fuel inlet line near fuel filter. Turn ignition off. Remove scan tester. If fuel pump operates, check fuel pressure. See FUEL PRESSURE .
- If fuel pump does not operate, EFI main relay, circuit opening relay or fuel pump relay (if used) may be defective. For relay application and explanation of relay operation, see FUEL PUMP CONTROL CIRCUIT .
- If relays are okay, check wiring circuit and fuses. If fuel pump does not operate, check for defective fuel pump or defective fuel pump ground circuit. See appropriate wiring diagram in WIRING DIAGRAMS article.
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When to See a Mechanic
Stop DIY work and contact a certified mechanic immediately if any of the following apply:
- • You smell fuel, burning insulation, or see smoke.
- • Brakes feel soft, pull hard to one side, or make grinding noises.
- • The engine overheats, stalls repeatedly, or misfires under load.
- • You are missing required tools, torque specs, or safe lifting equipment.
- • You are not confident in the next step or safety outcome.