Idle Stabilizer, Checking

Checking Idle Stabilizer

1st Check, Function

Note: Idle stabilizer triggering can vary depending upon specific vehicle wiring; however, in all cases the following functional check applies.





- Start engine and let idle
Idle stabilizer valve 1 must vibrate and hum

If OK, go ahead with 2nd check

If NOT, remove connector from valve 1 and check resistance of valve with multimeter US 1119
Specified value: display (continuity)

If specified value NOT obtained
- Replace valve

If specified value IS obtained
- Re-connect connector to valve and check electrical connections on control unit relay adapter (in front of right tail light) according to wiring diagram

If electrical connections OK
- Replace idle stabilizer control unit

2nd Check, Regulator

Requirements

Engine oil temperature min. 80°C
Electrical consumers turned OFF
No leaks in intake air system
Ignition timing OK
Idle rpm OK
CO% content OK

Procedure:
- Remove crankcase breather hose and close tightly
- Connect multimeter US 1119 with adapter VW 1315A/2 to idle stabilizer valve 1
- Let engine idle
specified value: approximately 430 - 20 mA (fluctuating)





- Disconnect connector 2
specified value: approximately 430 mA constant

If test conditions have been met and specified values are NOT obtained
- Replace idle stabilizer control unit