Digifant
The valve prevents the idle speed from dropping excessively when the load increases, for example, when many electrical consumers are switched on. Thanks to this, the engine does not stall and its vibrations are not transmitted to the car interior.
Turn on the ignition. The speed stabilization valve should vibrate and buzz when idling. In this case, check the valve adjustment.
If the valve does not buzz, disconnect the plug from the valve and measure the resistance in the circuit from the valve to the connecting contacts. The prescribed resistance value is 3.5-4.5 ohms, otherwise replace the valve.
Check the conductivity of the electrical wire to the valve, if necessary, repair the break or replace the control unit of the Digifant system.
Control check
Warm up the engine to an engine oil temperature of at least +80°C.
Digifant system temperature sensor (blue insulation) check, replace if necessary.
Check the intake tract for leaks. To do this, start the engine and leave it to idle. Treat all places of seals with a brush with gasoline. If the engine speed increases, then the engine sucks in additional air at the place of processing with gasoline. In this case, replace the corresponding sealing gasket.
Attention: Do not spray gasoline on hot parts or the ignition system, fire hazard! Do not inhale gasoline vapors, poisonous!
Connect a suitable ammeter with test lead to idle speed control valve -1- (serial connection).
Let the engine idle for approximately one minute. Then give gas three times and each time increase the crankshaft speed to a value above 3000 1 / min.
At an idle speed of 800±50 1/min, measure the control current. The prescribed value is approximately 420±30 mA, fluctuating.
Disconnect the plug from the temperature sensor. The specified current value is approx. 420±30 mA, constant.
Attention: The value of the control current for speed stabilization depends on the engine load when idling.
With the following load, the current value can vary from 400 to 1000 mA:
- engine is cold;
- the air conditioning system is on;
- consumers of electricity are switched on;
- with power steering: steering engaged.
If the specified current values are not reached, replace the control unit (workshop work).
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