Contents - Volkspage

4B.4 Fuel system: multi-point injection models
4.6 Prise the cable grommet (arrowed)
from the bulkhead
5.4 Remove the air flow meter
retaining screws (at-rowed)
5.7 Unplug the wiring harness from the
potentiometer at the connector (arrowed)
through into the engine bay, prise the
grommet from the bulkhead (see illustration).
7 Release the cable from its securing clips
and guide it out through the bulkhead into the
engine bay.
Refitting
8 Refit the accelerator cable by following the
removal procedure in reverse.
Adjustment
9 At the throttle body, fix the position of the
cable outer in its mounting bracket by
inserting the metal clip in one of the locating
slots, such that when the accelerator is
depressed fully, the throttle valve is held wide
open to its end stop.
Air flow meter
Removal
1 Disconnect the battery negative cable and
position it away from the terminal.
2 With reference to Section 2 and Chapter 1,
remove the top cover from the air cleaner
assembly.
3 Unplug the harness connector from the air
flow meter.
4 Remove the retaining screws and detach
the meter from the air cleaner top cover -
recover the seal (see illustration).
Caution: Handle the air flow meter
carefully - its internals are easily damaged.
Refitting
5 Refitting is a reversal of removal. Renew the
seal if it appears damaged.
Throttle valve potentiometer
(engine code 3F only)
Removal
6 Disconnect the battery negative cable and
position it away from the terminal.
5.11 The inlet air temperature sensor
(arrowed) is an integral part of the
air flow meter
7 Unplug the harness connector from the
potentiometer (see illustration).
8 Remove the retaining screws and locking
plate, then lift the potentiometer away from
the throttle body. Recover the O-ring seal.
Refitting
9 Refitting is a reversal of removal, noting the
following:
a) Renew the O-ring seal if it appears
damaged.
b) Ensure that the potentiometer drive
engages correctly with the throttle spindle
extension.
IO On completion, the potentiometer
must be “matched” electronically to the
Digifant Electronic Control Unit (ECU). This
operation requires access to dedicated
electronic test equipment, refer to a VW
dealer for advice.
Inlet air temperature sensor
Removal
11 The sensor is an integral part of the air
flow meter and cannot be renewed separately
(see illustration).
Auxiliary air valve
Removal
12 The valve is mounted on a bracket below
the inlet manifold - access is extremely limited
with the inlet manifold in position.
13 Unplug the harness connector from the
valve.
14 Release the clips and disconnect the
5.17 Two coolant temperature sensors are
fitted; the one colour coded blue (arrowed)
serves the engine management system
hoses from the auxiliary valve. Note their
order of connection to aid correct refitting.
15 Remove the screw and detach the valve
from its mountings.
Refitting
16 Refitting is a reversal of removal.
Coolant temperature sensor
Removal
17 The coolant temperature sensor is
mounted at the left hand side of the cylinder
head, directly underneath the ignition
distributor. Two sensors are fitted; the one
colour coded blue serves the engine
management system, the black one produces
a signal for the instrument panel temperature
gauge (see illustration).
18 Unplug the harness connector from the
sensor.
19 Refer to Chapter 3 and drain
approximately one quarter of the coolant from
the engine.
20 Extract the retaining clip and lift the
sensor from the coolant elbow - be prepared
for coolant loss. Recover the O-ring.
Refitting
21 Refit the sensor by reversing the removal
procedure, using a new O-ring. Refer to
Chapter 1 and top-up the cooling system.
Engine speed Hall sender
22 This sensor is an integral part of the
ignition HT distributor assembly. It can be
removed and renewed separately, but
dismantling of the distributor will be