Idle Up Control Valve: Adjustments

IDLE STABILIZATION, ADJUSTING

Requirements:
- engine cold
- A/C switched OFF
- all other electrical consumers switched OFF





- attach multimeter US 1119, using VW 1315A/2 adaptor to idle stabilization valve, switch to 2A scale
- switch ON ignition
- 945 - 1055 mA

IF NO
- replace control unit
- start engine and warm up to 80°C (176°F) oil temperature, with A/C switched OFF
- idle stabilizer mA value should be: 430 ± 20 mA

NOTE: If readings are 480 ± 25 milli-amps with auto transmission or 490 ± 25 milli-amps with manual transmission, check for wire break between control unit and ignition coil terminal 1.

- specification with A/C ON automatic transmission 500 ± 20 milli-amps
- specification with A/C ON manual transmission 490 ± 20 milli-amps





IF NO
- adjust throttle by-pass screw (arrow) until 430 ± 20 mA is obtained
- check idle speed 800 ± 70 RPM