Deceleration Fuel Cut-Off (Digifant II)
DIGIFANT IIDeceleration Fuel Cut-off - Checking
Note: It is possible to check the deceleration fuel cut-off function using the full throttle switch because the full throttle and idle switch are wired in parallel and connected to the Digifant E.C.U. by the same wires.
Requirements
- Engine oil temperature at least 80°C (176°F).
- Coolant temperature sensor and wiring OK.
- Throttle switches and wiring OK.
- VW engine tester 1367 connected.
- Start the engine and raise speed to a minimum of 2400 RPM four times, letting the throttle close each time,
- With engine idling, close throttle switch with thumb (1).
- While holding full throttle switch closed, SLOWLY open the throttle with a screwdriver (2) to increase engine speed.
- At approx. 2200 - 2700 RPM, the injection will be cut off and RPM will drop.
- At approx. 1300 - 1800 RPM, the injection will re-activate and RPM will rise.
- This cycle will continue as long as you try to hold the RPM steady at 2700 RPM.
If the cycle does not occur,
- Replace the Digifant E.C.U.