Volkswagen Fox (2004 year). Manual — part 24
demister, must be off.
Check operation and power supply voltage
– Fold rear seat forwards.
– Remove fuel pump access cover.
– Briefly operate starting motor. The fuel pump operation must
be audible.
– Switch off ignition.
If fuel pump does not work:
– Remove 4-pin connector from the fuel pump flange.
– Connect Test probe -VAG 1527B- to outer contacts of con‐
nector using adapter cables from -V.A.G 1594 - .
– Switch ignition on. The LED shall light ON for about 2 seconds.
If the LED does not light ON:
– Locate and repair cable interruption, according to the current
circuits scheme. ⇒ Current flow diagrams, Electrical fault find‐
ing and Fitting locations.
If the LED lights ON (power supply OK).
– Remove fuel pump
⇒ page 91
.
– Check if cables are connected between flange and fuel pump.
In case there is no cable interruption:
– Replace fuel pump
⇒ page 91
.
Check current consumption at fuel pump
– Remove 4-pin connector from the fuel pump flange.
Fox 2004 ➤
1. Fuel supply system components - remove and install
93
tween the contacts -1- of the connector and fuel pump.
Note
The Multimeter -V.A.G 1715 - test probe can also be inserted be‐
tween the contact -1- connector and the fuel pump by using the
adapter cables of the Multimeter -V.A.G 1715 - .
– Connect contacts -4- of connector and fuel pump by using the
adapter cables from -V.A.G 1594 A- .
– Start engine and run at idle speed.
– Measure current at fuel pump. Specification: 6,3...7.8 A.
– If the values measured lie outside the specifications:
– Replace fuel pump
⇒ page 91
.
1.9
Accelerator mechanism - repair
1 - Support
❑ Remove and install ⇒
Rep. Gr. 46 .
2 - Connector
❑ Black, 6-pin.
3 - Accelerator pedal position
sensor -G79-
❑ Not adjustable.
❑ Accelerator pedal posi‐
tion sensor transmits
the pedal position to en‐
gine command unit.
❑ Remove feet rest area
cover to remove sensor.
4 - 10 Nm
Fox 2004 ➤
94
Special tools and workshop equipment required
♦ Pressure test equipment -VAS 5187-
♦ Torque wrench - 5 to 50 Nm ( enc. 1/2") -VAG 1331-
♦ Vehicle diagnosis, measurement and information system -
VAS 5051A/52- with Diagnostic cable (3 m) -VAS 5051/5-
Test conditions
• Coolant temperature at least 85 °C.
• Injectors must be in order.
• Fuel filter and pipes must not be blocked.
• The check valve in the fuel supply hose must be in order.
Test sequence
– Remove plug -arrow-.
Fox 2004 ➤
1. Fuel supply system components - remove and install
95
Vehicle
self-diagnosis
. Then, select engine electronic control unit
with
01 Engine electronic system
.
– Select function
08 Read value block
.
– Select screen “2” via numeric keys (on keyboard) and confirm
with
Q
key.
– Read engine idle speed on field 1.
– Increase engine speed to 1,500 rpm.
– Check pressure on the pressure gauge. Specification: at least
3.5 bar.
– Press the
←
key.
– Select function
06 End the test
function key.
– Switch off ignition.
If the specification is not obtained:
– Replace auxiliary pump
⇒ page 97
.
Note
After removing pressure gauge unit, tighten plug at 25 Nm. Al‐
ways replace seal.
Fox 2004 ➤
96
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