Checking secondary air pump relay J299 and activation — AUDI

Checking
secondary air pump relay
J299
and activation
Special tools and workshop equipment required
Hand-held multimeter
V.A.G 1526 A
or
V.A.G 1526 B
Voltage tester
V.A.G 1527 B
Auxiliary measuring set
V.A.G 1594 A
or
V.A.G 1594 C
Adapter cable, 121-pin
V.A.G 1598/31
(test box)
Vehicle diagnosis, testing and information system
VAS 5051 A
with
diagnosis lead
VAS 5051/1
Test sequence
Connect up
vehicle diagnostic, testing and information system
VAS 5051 A
with
diagnosis lead
VAS 5051/1
and select vehicle system
“01 - Engine electronics”
from list. When doing this, the ignition must be switched on.
Display on
VAS 5051 A
From the menu
1
select the diagnostic function
“03 - Final control diagnosis”
.
Display on
VAS 5051 A
Keep touching the
→
key until the following display appears:
A
5thcontrol element in test
5
Secondary air pump relay
J299
Press the
→
key again.
A
Actuator is running; continued switching is allowed
The
secondary air pump relay
J299
item 1
(below cover on left side of bulkhead) should pick up intermittently (with an audible click) and the
secondary air pump motor
V101
should start up intermittently.
Exit function
“03 - Final control diagnosis”
by pressing the
←
key.
Press
“06 - End output”
.
Switch off ignition.
A - If the relay does not pick up:
Check voltage supply of secondary air pump relay
Anchor
.
Check activation of secondary air pump relay
Anchor
.
B - If the relay picks up but the secondary air pump motor does not run:
Check voltage supply of secondary air pump motor
Anchor
.
Checking voltage supply of secondary air pump relay
Fuse 1
S131
(50 A) in main fuse box/battery OK
Fuse in fuse holder
S243
(position 43) OK.
Disconnect secondary air pump relay.
Connect multimeter to measure voltage between contact
1
and earth.
Specification: approx. battery voltage
If specification is not obtained:
Check wiring between battery + (terminal 30) and
fuse 1
S131
for
secondary air pump relay
J299
(below cover on left side of bulkhead) for open circuit using the current flow diagram.
Repair wiring connection if necessary.
Connect multimeter to measure voltage between contact
3
and earth.
Operate the starter briefly.
Specification: approx. battery voltage
Switch off ignition.
If specification is not obtained:
Check wiring between
secondary air pump relay
J299
(below cover on left side of bulkhead) and
fuel pump relay
J17
via fuse for open circuit using the current flow diagram.
Repair wiring connection if necessary.
Checking activation of secondary air pump relay
Disconnect secondary air pump relay.
Connect up
voltage tester
V.A.G 1527 B
between contact
4
and battery positive.
Vehicle diagnostic, testing and information system
VAS 5051 A
with
diagnosis lead
VAS 5051/1
is connected; vehicle self-diagnosis and vehicle system
“01 - Engine electronics”
is selected. When doing this, the ignition must be switched on.
Display on
VAS 5051 A
From the menu
1
select the diagnostic function
“03 - Final control diagnosis”
.
Display on
VAS 5051 A
Keep touching the
→
key until the following display appears:
A
5th control element in test
5
Secondary air pump relay
J299
Press the
→
key again.
A
Actuator is running; continued switching is allowed
The LED should flash.
Exit function
“03 - Final control diagnosis”
by pressing the
←
key.
Switch off ignition.
If the LED does not flash:
Connect
adapter cable, 121-pin
V.A.G 1598/31
(test box) to connectors of wiring harness; do not connect engine control unit. Connect earth clip of test box to earth
Rep. Gr.
24
.
Caution
To avoid damage to the electronic components, select the required measuring range and observe test conditions before connecting the test leads.
Check for open circuit and short to positive or earth in the following wiring:
Relay carrier on bulkhead (left-side)
Contact
Adapter cable, 121-pin
V.A.G 1598/31
(test box)
Socket
4
72
Repair wiring connection if necessary.
If no fault is found:
Renew
secondary air pump relay
J299
.
Checking voltage supply for secondary air pump motor
Take off engine cover panel
arrows
.
Unplug electrical connector
arrow
at
secondary air pump motor
V101
.
Connect
voltage tester
V.A.G 1527 B
between contacts
1
and
2
.
Vehicle diagnostic, testing and information system
VAS 5051 A
with
diagnosis lead
VAS 5051/1
is connected; vehicle self-diagnosis and vehicle system
“01 - Engine electronics”
is selected. When doing this, the ignition must be switched on.
Display on
VAS 5051 A
From the menu
1
select the diagnostic function
“03 - Final control diagnosis”
.
Display on
VAS 5051 A
Keep touching the
→
key until the following display appears:
A
5th control element in test
5
Secondary air pump relay
J299
Press the
→
key again.
A
Actuator is running; continued switching is allowed
The LED should flash.
Exit function
“03 - Final control diagnosis”
by pressing the
←
key.
Switch off ignition.
If the LED does not flash:
Check for open circuit in wiring from contact 2 of connector to
secondary air pump relay
J299
(in relay carrier below cover on left side of bulkhead) using the current flow diagram.
Use current flow diagram to check for open circuit in wiring leading from contact 1 of connector to earth.
Repair wiring connection if necessary.
If no fault is found:
Renew the secondary air pump
Chapter
.