Testing fuel pump relay -J17 and activation - Vehicles with 4-cylinder engine — AUDI

AFB AFF AFN AHH AHU AJM AKN ATJ AVG
Special tools and workshop equipment required

V.A.G 1526 A
V.A.G 1527 B
V.A.G 1594 A

Test requirement:

Battery voltage not less than 12.7 V

Test sequence

Remove storage compartment on driver's side:

=> General body repairs, Interior; Repair group 68; Storage compartments, covers; Removing driver's storage compartment
General body repairs, Interior
Storage compartments, covers
Removing driver's storage compartment

Start the engine.
The fuel pump relay located in 13-point relay carrier (no fixed position) should pick up; this can be felt by touching the relay. The fuel pump should run (audible in boot with cover removed from fuel delivery unit - 2nd mechanic required).

A - If the relay does not pick up:

Test voltage supply to fuel pump relay.

B - If the relay picks up but the fuel pump does not run:

Test activation of fuel pump
=>Page
20-128
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Test fuel pump (electrical test) =>Page
20-129
.

Testing voltage supply of fuel pump relay

Remove fuel pump relay from 13-point relay carrier (no fixed position).

Connect voltage tester V.A.G 1527 B as follows:

13-point relay carrier, / (No fixed position) / Contact · Measure against
2 · Engine earth

The LED should light up.

If the LED does not light up:

Rectify any open/short circuit as necessary.

=> Current flow diagrams, Electrical fault finding and Fitting locations binder

Connect voltage tester V.A.G 1527 B as follows:

13-point relay carrier, / (No fixed position) / Contact · Measure against
4 · Engine earth
6 · Battery positive

Start the engine.
The LED should light up.

If the LED does not light up:

Rectify any open/short circuit as necessary.

=> Current flow diagrams, Electrical fault finding and Fitting locations binder

Testing activation of fuel pump

Requirements for test:

Fuel pump relay connected
Engine control unit connected.

Open fuse box cover on the left side of the dashboard panel.

Pull fuse S 228 off fuse carrier (left row, 5th large fuse from the top).
Connect multimeter (voltage test range) between earth and left fuse contact.
Operate starter.
Specification: approx. battery voltage

If the specification is not obtained:

Check wiring

=> Current flow diagrams, Electrical fault finding and Fitting locations binder

If the wiring is OK and no faults are found in the tests up to this point:

Fit a new fuel pump relay -J17.