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Fuel Cut System

WARNING: This page is about a different variant/trim than selected.
  1. When checking fuel cut system, engine RPM must be monitored. Scan tester is connected to data link connector No. 3 for monitoring engine RPM. For connecting of scan tester, see IDLE SPEED & MIXTURE in ADJUSTMENTS article.
  2. Start and warm engine to normal operating temperature. Ensure A/C and all accessories are off. Gradually increase engine RPM to maintain at least specified engine speed. See FUEL CUT SYSTEM TESTING SPECIFICATION  table.
    FUEL CUT SYSTEM TESTING SPECIFICATION

    Application Engine RPM
    Supra 3000
  3. Using stethoscope, check for fuel injector operating sound. Ensure when throttle lever is released, fuel injector stops operating momentarily and then resumes operating (fuel return RPM).
  4. Ensure fuel return RPM is within specification. See FUEL CUT SYSTEM SPECIFICATIONS  table. Shut engine off. Remove test equipment.
FUEL CUT SYSTEM SPECIFICATIONS (1)

Application Fuel Return RPM
Supra 1400
(1) Check with engine at normal operating temperature and with A/C and all accessories off.
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