Deceleration Fuel-Cut System Test

Connect a tachometer to engine (to monitor needle fluctuations). See ADJUSTMENTS for tachometer attaching points. Start engine and warm to operating temperature. Ensure A/C and other accessories are off.
Unplug throttle position sensor connector from throttle position sensor. Short terminals IDL and E1 (or E2) on wire side of connector. See Fig 1.

Fig 1: Terminal Connector For Testing Deceleration Fuel-Cut RPM
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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 2: Needle Fluctuations When Testing Fuel-Cut RPM

DECELERATION FUEL-CUT & FUEL RETURN RPM

Application	Fuel-Cut Engine RPM	Fuel Return Engine RPM
Non-Turbo	1800	1200
Turbo	1600	1200