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HOMESERVICE MANUALSTOYOTA19904RUNNER 2D UTILITY, 2.4 R, AUTOMATICREPAIR AND DIAGNOSISENGINE PERFORMANCESYSTEMENGINE CONTROLS - SYSTEM/COMPONENT TESTS - EFIFUEL SYSTEMSDECELERATION FUEL-CUT SYSTEM TEST
1990 Toyota 4Runner 2D Utility, 2.4 R, Automatic

Deceleration Fuel-Cut System Test

1990 Toyota 4Runner 2D Utility, 2.4 R, AutomaticSECTION Deceleration Fuel-Cut System Test
  1. Connect a tachometer to engine (to monitor needle fluctuations). See appropriate ADJUSTMENTS article for tachometer attaching points. Start engine and warm to operating temperature. Ensure A/C and other accessories are off.
  2. Unplug throttle position sensor connector from throttle position sensor. Short terminals "IDL" and "E1" (or "E2") on wire side of connector. See Fig 1.
  3. Gradually raise engine RPM. Fuel-cut operation can be checked by noting the fluctuation of tachometer needle. Fluctuation indicates fuel-cut system is being turned on and off. See Fig 2. Check that fuel-cut points and fuel return points are within specifications. See DECELERATION FUEL-CUT & FUEL RETURN RPM  table.
Fig 1: Terminal Connector For Test Deceleration Fuel-Cut RPM
G95432Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
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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.