Operation CHARM: Car repair manuals for everyone.
Home >> Volkswagen >> 2008 >> Passat Sedan (3C2) L4-2.0L Turbo (BPY) >> Repair and Diagnosis >> Powertrain Management >> Computers and Control Systems >> Testing and Inspection >> Component Tests and General Diagnostics >> Component Tests (VAG Code Tests) >> Turbo Engine Mechanical Fuel Injection And Ignition - Fuel Supply System >> Delivery Quantity, Checking

Delivery Quantity, Checking



Delivery Quantity, Checking

- Remove seat bench







- Remove cover - 1 - with Fuel Pump (FP) control module J538 - 2 - from fuel delivery unit.







- Disconnect the flange connector - A -.







- Place the test instrument adapter/DSO (5 pin) VAS 5565 on the connector and on the fuel delivery unit.
- Connect the remote control V.A.G 1348/3A to the test instrument adapter/DSO (5 pin) VAS 5565 and to battery plus (+).

NOTE: This work step allows the fuel pump to run when the engine is not running.

- Remove fuel filler cap from fuel filler tube.

CAUTION: Fuel supply line is under pressure. Wear protective goggles and protective clothing to prevent injuries and contact with skin. Before removing from hose connection wrap a cloth around the connection. Then release pressure by carefully pulling hose off connection.







- Disconnect supply line - arrow - and catch escaping fuel using a cloth.

NOTE: Press in securing ring to disengage the fuel lines.







- Connect pressure gauge V.A.G 1318 with double connection V.A.G 1318/23 and adapter set V.A.G 1318/17A to fuel supply line.
- Connect hose adapter V.A.G 1318/16 to adapter V.A.G 1318/11 of pressure gauge and hold it in a measuring container.

CAUTION: Danger of spraying when opening shut-off valve; wear protective goggles and protective clothing to prevent injuries and contact with skin. Hold container in front of free connection of pressure measuring device.

- Open shut-off valve of pressure gauge set. Lever will point in direction of flow - A -.
- Operate remote control V.A.G 1348/3A. Slowly close shut-off tap, until pressure gauge shows 4 bar. From this point on do not move position of shut-off tap.
- Empty measuring container.
- Delivery rate of Fuel Pump (FP) is dependent on battery voltage. Therefore, also connect multi-meter V.A.G 1715 to Fuel Pump (FP) using adapter cables from connector test kit V.A.G 1594C.
- Operate the remote control for 30 seconds and simultaneously measure voltage at Fuel Pump (FP).







- Compare the quantity of fuel delivered with specification.
*) Minimum delivery rate cu.cm /30s
**) Voltage at Fuel Pump (FP) with engine at stand still and pump running.

Example:
During test, a voltage of 10.5 Volts is measured. This results in a minimum delivery rate of approximately 580 cu.cm /30 s.

If the Specification is Not Obtained
- Check fuel line for possible restrictions (kinks) or clogging.

If no malfunction can be found:
- Remove Fuel Pump (FP) and check filter strainer for dirt. If there is no malfunction here as well, replace flange with fuel filter.
- Repeat the test.

If specified value is again not obtained:
- Fuel Pump (FP) faulty, replace fuel delivery unit.

If the delivery rate has been attained but nevertheless you suspect a fuel supply system malfunction (e.g. intermittent failure of fuel supply system):
- Check Fuel Pump (FP) current draw.
pro multis · About Operation CHARM