Deceleration Fuel-Cut System
- Connect a tachometer to engine (to monitor needle fluctuations). See ADJUSTMENTS article in this section 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 and Fig 2.
- 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 3. 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
| Application | Fuel-Cut RPM | Fuel Return RPM | |
|---|---|---|---|
| 4A-FE | 1800 | 1200 | |
| 4A-GE | |||
| A/C Off | 1600 | 1200 | |
| A/C On | 1900 | 1500 | |