Volkswagen Workshop Service and Repair Manuals

Checking delivery rate l  Voltage supply OK. l  Remote control for V.A.G 1348 -V.A.G 1348/3A- is connected. –  Remove filler cap from fuel tank filler neck.   WARNING Fuel supply lines are under pressure! Before loosening hose connections, wrap a cloth around the connection. Then release pressure by carefully pulling hose off connection. Engine codes AAM, ABS, ADZ, ANN, ANP

–  Pull fuel supply line -1- off injector. –  Connect K-Jetronic pressure tester -V.A.G 1318- with adapter -V.A.G 1318/10-12- to fuel supply line -1-. –  Push adapter -V.A.G 1318/1- onto adapter -V.A.G 1318/11- of pressure tester and hold in measuring container. –  Open shut-off tap of pressure tester (handle in through-flow direction). –  When operating remote control for V.A.G 1348 -V.A.G 1348/3A- close shut-off tap slowly until pressure gauge indicates 1.2 bar. Do not change position of shut-off tap. Engine codes 2E, ADY, AGG, AKR –  Remove intake hose.

–  Pull fuel supply line -1- off fuel rail. –  Connect K-Jetronic pressure tester -V.A.G 1318- with adapter set -V.A.G 1318/10-12- to fuel supply line -1-. –  Push adapter -V.A.G 1318/1- onto adapter -V.A.G 1318/11- of pressure tester and hold it in measuring container. –  Open the pressure tester shut-off tap. The lever then points in direction of flow -A-. –  Operate remote control for V.A.G 1348 -V.A.G 1348/3A-. Then slowly close shut-off tap until a pressure of 3 bar is displayed on pressure gauge. From this point on do not move position of shut-off tap. Continuation for all engine codes –  Empty measuring container. –  To measure voltage, connect multimeter -V.A.G 1715- with adapter cables from auxiliary measuring set -V.A.G 1594C- to vehicle battery. –  Operate remote control for 30 seconds. –  Compare quantity of fuel delivered with specification.

Diagram for engine codes AAM, ABS, ADZ, ANN, ANP *) Minimum delivery rate cm3/30 seconds **) Fuel pump voltage with engine not running and pump running (approx. 2 volts less than battery voltage).

Diagram for engine codes 2E, ADY, AGG, AKR *) Minimum delivery rate cm3/30 seconds **) Fuel pump voltage with engine not running and pump running (approx. 2 volts less than battery voltage). Example: During test a battery voltage of 12.2 volt is measured. As the voltage at the pump is approx. 2 volts less than the battery voltage, this will equate to a minimum delivery rate of 550 cm3/30 s. If the minimum delivery rate is not attained: –  Check the fuel pipes for possible restrictions (kinks) or blockages.

–  Pull supply hose -1- off inlet to fuel filter. –  Connect K-Jetronic pressure tester -V.A.G 1318- with adapter set -V.A.G 1318/10-12- to hose. –  Repeat delivery rate check. If the minimum delivery rate is now attained: –  Renew fuel filter. If the minimum delivery rate is again not attained: –  Remove fuel delivery unit ( → Chapter) and check fuel strainer for soiling. Only if still no fault has been detected: –  Renew fuel delivery unit. If delivery rate has been attained, but nevertheless you suspect a fuel supply system fault (e.g. intermittent failure of fuel supply system): –  Check current consumption of fuel pump as follows: –  Reconnect all disconnected fuel lines.

–  Connect multimeter -V.A.G 1715- with pick-up clamp to the red/yellow wire in wiring harness. –  Start engine and run at idling speed. –  Measure current draw of fuel pump. Specification: max. 8 amps   Note If the fuel system malfunction is intermittent, you can perform the check during a road test, but a 2nd person is necessary. If the current consumption is exceeded: –  Renew fuel delivery unit.