Volkswagen Golf/Jetta 2 manual

Idle speed stabilisation system - testing
Fuel and exhaust systems - K-Jetronic fuel injection - 16 valve engines / 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 valve continuity after pulling off the connector (see illustration).

3.1 Checking continuity of idling stabilisation control valve wiring
3.1 Checking continuity of idling stabilisation control valve wiring

2 Similarly, check the system temperature sender resistance at the following temperatures (see illustration): a) At 20°C - approximately 1000 ohms b) At 60°C - approximately 250 ohms c) At 100°C - approximately 75 ohms

3.2 Checking temperature sender resistance
3.2 Checking temperature sender resistance

3 If the system fault cannot be traced using the previous test then check all associated wiring. If necessary, renew the control unit which is located behind the centre console.

4 The operations of the control valve may be checked by connecting a multi-meter to it.

With a tachometer connected, run the engine (hot) at idle speed and note the control current. Now pinch the hose shown (see illustration) and check that the current rises.

Release the hose, increase the engine speed to 1300 rpm and actuate the throttle valve switch. The control current should drop below 430 mA. With the wiring disconnected as described in paragraph 6, Section 2, the control current should be constant between 415 and 445 mA.

3.4 Checking idle stabilisation valve by pinching hose (arrowed)
3.4 Checking idle stabilisation valve by pinching hose (arrowed)


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