Gasoline engine injection system VW Transporter T4

Gasoline injection system — general information
The VW T4 petrol engines are equipped with the Digifant VW injection system. The advantages of a gasoline injection system compared to using a carburetor are: accurate dosing of...

Checking idling and CO content
Digifant ignition and injection system (4-cylinder petrol engine) 1. Air filter. With adjustable intake air heating damper; 2. Intake air duct; 3. Plug connection for lambda probe...

Idle stabilization
Digifant control unit and lambda probe 1. Ground connection. Attached to body 2. Connecting plug. Disconnect the plug only when the ignition is switched off 3. Digifant control...

Throttle damper
Throttle damper adjustment Attention! Only for manual transmission vehicles equipped with 4-cylinder (until 5/93) and 5-cylinder petrol engines (until 12/92) The throttle valve...

Injection valves — removal and installation
The valves inject fuel intermittently: for each revolution of the crankshaft, half of the fuel required for one stroke is injected. The fuel injected by the valve is in the shape...

Checking injection valves
Checking for voltage and resistance 1. Check Hall sensor. 2. Disconnect the plug from the cold start valve. 3. Check for voltage at all injection valves. To do this, connect the...

Idling switch
Throttle valve and idle speed control valve 1. Bolt. M6 = 10 Nm, M8 = 20 Nm; 2. Idle speed adjustment bolt (up to 5/93 g); 3. Ring. Replace if damaged; 4. Throttle pipe; 5....

Temperature sensor resistance value
Temperature sensor resistance graph The coolant temperature sensor on the coolant pipe is 2-pole. Intake air temperature sensor on CO potentiometer; pin 2 and 3 on the CO...

Checking the intake air heating
Air filter 1. Intake air duct with adjustable intake air heating damper; 2. Hose to warm air trap on exhaust manifold; 3. Filter element; 4. Air filter housing; 5. Rubber washer;...

Technical data of the Digifant system
Engine code AAS AAF Engine power 84 hp. 110 hp. Limit turns 5300 rpm 5500 rpm idle speed 800±25 rpm 800±25 rpm CO content 0.7±0.2 vol. % (up to 5/93) 0.3±1.2 vol. % (up to 6/93)...

Diagnostics of malfunctions of the fuel injection system Digifant
Before starting to troubleshoot using the following table, some prerequisites must be met: start-up errors must be ruled out. For both cold and hot engines, it is important that:...

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