2002 Toyota PriusFACTORY OEM SERVICE PROCEDURE

Fuel Cut System (Prius)

WARNING: Read service precautions before proceeding with service procedure. See SERVICE PRECAUTIONS .
  1. It is necessary to put transit in inspection mode so engine will run continuously when checking fuel cut system. To put transit in inspection mode, perform the following steps within 60 seconds:
    • Ensure ignition is off and then turn ignition on.
    • Ensure transaxle is in Park and then fully depress accelerator pedal 2 times.
    • Place transaxle in Neutral and then fully depress accelerator pedal 2 times.
    • Place transaxle back in Park and then fully depress accelerator pedal 2 times.
  2. Check that master warning light on instrument cluster at center of instrument panel is flashing to indicate inspection mode operation. See Fig 1. Master warning light may also be referred to as hybrid system error warning light. Turn ignition switch to START position to start engine. Engine will now start and run continuously.
  3. Connect Toyota hand-held tester or scan tool to data link connector No. 3 at driver's side of instrument panel. See Figure. Hand-held tester or scan tool is used to read engine RPM. Warm engine to normal operating temperature.
  4. Ensure A/C is off. Gradually increase engine speed to 2250 RPM. Using stethoscope, check for fuel injector operating sound. Ensure when throttle lever is released, fuel injector stops operating momentarily and then resumes operating. Ensure when throttle lever is released, fuel injector stops operating momentarily and then resumes operating at 1400 RPM which is the fuel return RPM. Shut engine off. Remove hand-held tester or scan tool.
    Fig 1: Locating Master Warning Light (Prius)
    G00016689Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
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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.

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