Checking charge air cooling pump V188: Audi 3.3 TDI (AKF)

Checking
charge air cooling pump
V188
Special tools and workshop equipment required
Portable multimeter
V.A.G 1526 B
or
V.A.G 1526 A
Voltage tester
V.A.G 1527 B
Adapter set
V.A.G 1594 C
or
V.A.G 1594 A
Test box
V.A.G 1598/30
Vehicle diagnostic, testing and information system
VAS 5051 A
with
diagnostic wire
VAS 5051/1
Test conditions
Pump fuse OK (in relay and fuse carrier in electronics box in plenum chamber)
Vehicle diagnostic, testing and information system
VAS 5051 A
with
diagnostic wire
VAS 5051/1
connected, vehicle self-diagnosis and vehicle system
“01 - Engine electronics”
selected; when doing this, the ignition must be switched on
Fault memory interrogated
Test sequence
Display on
VAS 5051 A
In list
1
select function
“03 - Final control diagnosis”
.
Keep touching
→
key until
charge air cooling pump relay
J536
is actuated.
The
charge air cooling pump relay
J536
(in relay and fuse carrier in electronics box in plenum chamber) must be energised (click) intermittently and the
charge air cooling pump
V188
must run intermittently (can be heard at left of engine compartment).
Terminate function
“03 - Final control diagnosis”
by touching
←
key and switch off ignition.
A - If relay is not energised:
Check power supply of
charge air cooling pump relay
J536
Anchor
.
Check actuation of
charge air cooling pump relay
J536
Anchor
.
B - If relay is energised but
charge air cooling pump
V188
does not run:
Check power supply for
charge air cooling pump
V188
.
Checking power supply of
charge air cooling pump relay
J536
Slacken off cross-head bolts
1
at electronics box in plenum chamber.
Unclip plenum chamber cover
2
at front at bulkhead
arrows
.
Detach plenum chamber cover.
Prise out cover
1
in scuttle panel trim and slacken off rear cross-head bolt
rear right arrow
.
Slacken off the remaining cross-head bolts
arrows
.
Detach cover for electronics box in plenum chamber.
Screw out bolt
arrow
.
Disengage retainer.
Lay aside
diesel direct injection system control unit 2
J494
Item 2
with connectors attached.
Pull
charge air cooling pump relay
J536
arrow
out of relay and fuse carrier in electronics box in plenum chamber.
First connect up multimeter (voltage measuring range) between relay socket contact
2
and earth and then between relay socket contact
6
and earth.
Switch on ignition.
Specification: approx. battery voltage
If reading does not match specification:
Use current flow diagram to repair wiring.
Checking actuation of
charge air cooling pump relay
J536
Connect up
voltage tester
V.A.G 1527 B
between relay socket contact
6
and battery positive.
Repeat function
“03 - Final control diagnosis”
.
Keep touching
→
key until
charge air cooling pump relay
J536
is actuated.
LED must flash (does not go out completely).
Terminate function
“03 - Final control diagnosis”
by touching
←
key and switch off ignition.
If LED flashes but relay is not energised:
Replace
charge air cooling pump relay
J536
.
If LED does not flash:
Detach
diesel direct injection system control unit
J248
1
. Release and unplug connectors.
With ignition switched off, connect
test box
V.A.G 1598/30
to connectors of
diesel direct injection system control unit
J248
only (not to actual control unit).
Check for open circuit and short to earth or positive in the following wiring:
Relay socket
Contact
Test box
V.A.G 1598/30
Socket
4
2/02
Repair wiring if necessary.
If no fault is found in wire:
Replace engine control unit.
Checking power supply for
charge air cooling pump
V188
On vehicles with auxiliary heater, screw out bolts
arrows
for attaching exhaust pipe of auxiliary/supplementary heater to noise insulation.
Unfasten quick-release fasteners
1
and detach front noise insulation.
Unplug connector at
charge air cooling pump
V188
arrow
.
Connect up
voltage tester
V.A.G 1527 B
between contacts 1 and 2.
Repeat function
“03 - Final control diagnosis”
.
Keep touching
→
key until
charge air cooling pump relay
J536
is actuated.
The LED must flash.
Terminate function
“03 - Final control diagnosis”
by touching
←
key and switch off ignition.
If LED does not flash:
Check for open circuit in wiring between connector of
charge air cooling pump
V188
and
charge air cooling pump relay
J536
(in relay and fuse carrier in electronics box in plenum chamber).
Check for open circuit in wiring between connector of
charge air cooling pump
V188
and earth point.
If no fault is found:
Replace charge air cooling pump.