Deceleration Fuel-Cut System Test

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.
Unplug throttle position sensor connector from throttle position sensor. Short terminals "IDL" and "E1" (or "E2") on wire side of connector. See Fig 1.
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

Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

Fig 2: Needle Fluctuations When Testing Fuel-Cut RPM

Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

DECELERATION FUEL-CUT & FUEL RETURN RPM

Model

Fuel-Cut Engine RPM

Fuel Return Engine RPM

Pickup

22R-E

2WD With A/T ⁽¹⁾

1300

1000

All Others

1900

1600

3VZ-E

1300

1000

4Runner

22R-E

1900

1600

3VZ-E

1300

1000

⁽¹⁾	Apply service brakes when testing 4-cylinder 2WD automatic transmission.