Volkswagen Golf/Jetta 2 manual

Idle speed stabilisation system - testing
Fuel and exhaust systems - Digifant fuel injection / Idle speed stabilisation system - testing


1 Check that the stabilisation control valve buzzes when the ignition is switched on. If not, use an ohmmeter to check the continuity valve after pulling off the connector (see illustration).

3.1 Idle speed stabilisation control valve (1)
3.1 Idle speed stabilisation control valve (1)

2 Run the engine until the oil temperature is at least 80°C. This should correspond to normal operating temperature.

3 Connect a multi-meter to the stabilisation control valve in series with the existing wiring.

4 All electrical components must be switched off during the test and power steering (where fitted) centralised.

5 Run the engine at idle speed. After approximately one minute, quickly increase the engine speed to 3000 rpm three times. At idling speed, the control current should be approximately 420 ± 30 mA and fluctuating.

With the temperature sender plug disconnected, the current should be approximately 420 ± 30 mA but constant.


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