Test Sequence:

WARNING: This page is about a different variant/trim than selected.

NOTE:

Pay attention to all safety precautions. Refer to SAFETY PRECAUTIONS .

Follow the guidelines for clean working conditions. Refer to PARKING/AUXILIARY HEATER AND FUEL SYSTEM CLEAN WORKING CONDITIONS .

-- Connect the Vehicle Diagnostic Tester -1- as follows:

Fig 1: Connecting Evaporative Emissions Tester To Vehicle

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-- Connect the diagnostic cable connector -2- to the diagnostic connection inside the driver footwell.

-- Switch the ignition on.

-- Select output diagnostic test mode for the fuel pump in the Vehicle Diagnostic Tester.

The fuel pump must now accelerate slowly up to the maximum RPM.

NOTE:

The output diagnostic test mode checks the fuel pump function.

The fuel pump is now activated.

The fuel pump runs very quietly.

If the output diagnostic test mode is performed several times in succession, it may be necessary to briefly start the motor before repeating the output diagnostic test mode.

-- Switch off the ignition.

If the Fuel Pump Does Not Start:

Fig 2: Identifying Right Cover

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-- Remove the bench seat. Refer to BENCH SEAT/SINGLE SEAT, REMOVING AND INSTALLING .

-- Unclip the cover -1- at the tabs in direction of -arrows- using the : 3409 .

-- Pull on the connector -arrow- without pressing the release to make sure the connection is secure.

Fig 3: Fuel Pump Control Module Connector

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-- Repeat the fuel pump function test if the connector was not connected correctly. Refer to Test Sequence: .

Fuel Pump Runs without Function:

-- Release and disconnect the connector -arrow-.

-- Check the contacts on the connector and on the fuel delivery unit for damage.

-- Connect the : VAS5565 to the connector and to the fuel delivery unit.

Fig 4: Connecting Multi-Meter To Terminals 1 And 5 Of Test Instrument Adapter/DSO (5-Pin) VAS 5565

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-- Connect an : FLU83III to the wires -1 and 5- on the : VAS5565 .

-- Repeat the fuel pump function test. Refer to Test Sequence: .

Specified value: approximately the battery voltage.

Voltage supply not OK:

-- Locate and repair the open circuit according to the wiring diagram. Refer to the appropriate Wiring Diagram.

Voltage supply OK:

-- Remove the fuel lines -1 and 2- from the flange. Disconnect the connector couplings. Refer to CONNECTOR COUPLINGS, DISCONNECTING .

Fig 5: Fuel Lines At Flange

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CAUTION:

The fuel system is under pressure.

Risk of injury from fuel spraying out.

Wear protective eyewear.
Wear safety gloves.
Reduce the pressure: place clean cloths around the connection point and carefully open the connection point.

Vehicles with Parking Heater:

-- If the vehicle has an auxiliary heater, then disconnect the connector and the fuel line from the Metering Pump -V54-.

Continuation for All Vehicles:

Fig 6: Identifying Locking Ring And Wrench T10202

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-- Drain the fuel tank. Refer to FUEL TANK, DRAINING .

-- Open the locking ring using the : T10202 .

-- Lift up the cover -3- for the fuel delivery unit.

Fig 7: Identifying Fuel Delivery Unit Flange

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-- Check if the wiring between the flange and fuel pump is connected.

-- Inspect the contacts for damage.

If an Open Circuit is not Detected:

-- The fuel pump is faulty. Replace the fuel delivery unit. Refer to FUEL DELIVERY UNIT/FUEL LEVEL SENSOR, REMOVING AND INSTALLING .

Tightening Specifications

Refer to OVERVIEW - FUEL DELIVERY UNIT/FUEL LEVEL SENSOR