Deceleration Fuel-Cut System Test
WARNING: This page does not describe the selected car, but rather 6 other vehicles, including the 1990 Toyota Pickup, 1990 Toyota Cab & Chassis, 1990 Toyota 4Runner, 1989 Toyota Pickup, and 1989 Toyota Cab & Chassis. However, it is still accessible from the selected car via links, so may be relevant.
- 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.
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 | ||||
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