With Manufacturer's Scan Tool

Fuel Injectors, Checking For Leakage


WARNING!
The fuel system is under pressure! Before loosening hoses or opening the test connection, cover the connection with a rag. Only then, open carefully to slowly release pressure.


Required special tools and test equipment
- VW 1594 connector test kit
- VAG 1630 digital potentiometer
- VAG 1602 fuel analyzer

Checking
- Disconnect harness connector for Camshaft Position (CMP) sensor -G40-.
- Disconnect vacuum hose from fuel pressure regulator.
- Remove fuel rail together with fuel injectors.







- Insert fuel injectors in VAG 1602 fuel analyzer.







- Disconnect harness connector for Engine Coolant Temperature (ECT) sensor -G62-.
- Adjust VAG 1630 digital potentiometer to 15k Ohms setting.
- Connect to ECT sensor harness connector terminals 1 and 3, using adapter cables from VW 1594 connector test kit.
- With the aid of a helper, briefly crank starter.
Fuel injectors must spray according to the firing order.
- Switch ignition off, and check for leaks at fuel injectors.
Fuel injectors may not drip more than 2 drops per minute.


NOTE: When reinstalling the fuel injectors be careful not to damage the O-rings.