Corrado L4-1781cc 1.8L SOHC SC (PG) (1990)
Digital Idle Stabilizer: Testing and Inspection
Idle stabilization, checking
Function, checking
- switch ON ignition
-
idle stabilizer valve 1 must vibrate and hum
If NO
- switch Fluke 83 multimeter (US 1119 or equivalent) to resistance range
- disconnect harness connector from idle stabilizer valve
- connect multimeter across stabilizer valve terminals
-
must be between 2 and 10 Ohms
If NO
- replace idle stabilizer valve
If YES
- reconnect stabilizer valve harness connector
- check stabilizer valve wiring for open circuit using wiring diagram
If wiring OK
- replace Digifant control unit (J 169)
Control, checking
Requirements
-
engine oil temperature 80°C (176°F) minimum
-
coolant temperature sensor (blue) OK
-
idle speed 0K
-
intake air system 0K (leak tight)
- switch multimeter to mA range
- connect test adaptor VAG 1315A/2 between idle stabilizer valve and its harness connector
- connect multimeter to terminals of VAG 1315A/2 adaptor using jumpers from VW 1594 adaptor kit
- start engine and let idle