Checking activation of secondary air pump relay J299: VW 1.6 (AEH, AKL, APF)

Checking activation of
secondary air pump relay
J299
Connect
121-pin adapter cable
V.A.G 1598/31
to control unit wiring harness. The engine control unit is also connected.
Bridge test box sockets 72 and 2 using adapter cables from
adapter set
V.A.G 1594A
.
Then switch ignition on and select engine control unit with
“Address word”
01.
Indicated on display:
Rapid data transfer HELP
Select function XX
Operate fault reader taking into account the information on the display:
Press keys
0
and
3
for function
“Final control diagnosis”
.
Indicated on display:
Rapid data transfer Q
03-Final control diagnosis
Activate
fuel pump relay
J17
.
Confirm entry with
Q
key.
Indicated on display:
Final control diagnosis ->
Fuel pump relay J17
The
fuel pump relay
J17
(on the relay plate, relay position 4) must click until switching to the next final control by pressing the
→
button (max. 50 seconds).
Note
Bridging test box sockets 72 and 2 when activating the
fuel pump relay
J17
also activates the
secondary air pump relay
J299
(in protective housing for relays). It must click and the
secondary air pump motor
V101
must run at intervals.
If the
secondary air pump motor
V101
does not run at intervals:
Pull 2-pin connector
arrow
off
secondary air pump motor
V101
and connect
diode test lamp
V.A.G 1527B
using adapter cables from
adapter set
V.A.G 1594A
to disconnected connector. The LED must flash.
If LED flashes:
Renew
secondary air pump motor
V101
:
If LED does not flash, but the
secondary air pump relay
J299
clicks:
Check wire between 2-pin connector contact 1 and body earth for open circuit.
If no wiring fault is detected:
Pull
secondary air pump relay
J299
arrow
off relay plate in protective housing for relays.
Note
If tools are necessary to pull relays or control units out of the relay plate, first disconnect battery earth strap.
Before disconnecting battery earth strap obtain code for radios with anti-theft coding.
Check wire for open circuit between
secondary air pump motor
V101
contact 2 and contact 2 of relay plate referring to current flow diagram.
If no wiring fault is detected:
Check voltage supply (terminal 30) for
secondary air pump relay
J299
referring to current flow diagram.
Current flow diagrams, Electrical fault finding and Fitting locations
If the voltage supply is OK:
Renew
secondary air pump relay
J299
.
If the LED does not flash and the
secondary air pump relay
J299
does not click:
Pull
secondary air pump relay
J299
arrow
off relay plate.
Note
If tools are necessary to pull relays or control units out of the relay plate, first disconnect battery earth strap.
Before disconnecting battery earth strap obtain code for radios with anti-theft coding.
Connect
voltage tester
V.A.G 1527B
to contacts 3 and 4 of relay plate using adapter cables from
adapter set
V.A.G 1594A
: LED must flash.
LED flashes:
Renew
secondary air pump relay
J299
.
LED does not flash:
Connect
voltage tester
V.A.G 1527B
to contact 3 of relay plate and body earth using adapter cables from
adapter set
V.A.G 1594A
: LED must flash.
LED does not flash:
Check wire between contact 3 of relay plate and fuse 43 for open circuit referring to current flow diagram.
LED flashes:
Disconnect
121-pin adapter cable
V.A.G 1598/31
from engine control unit. The wiring harness remains connected.
Remove bridge between test box sockets 72 and 2.
Check wire for open circuit between test box socket 72 and contact 4 of relay plate referring to current flow diagram. Wire resistance: max. 1.5 Ω.
Check wiring additionally for short circuit to battery positive or earth..
If no wiring fault is detected:
Renew engine control unit
Rep. Gr.
24
.