Testing secondary air pump relay -J299 and activation — AUDI

ALZ
Special tools and workshop equipment required

V.A.G 1526 A
V.A.G 1527 B
V.A.G 1594 A
V.A.G 1598/31

Fitting location => Fitting locations overview, Page
24-5

Start final control diagnosis and select secondary air pump relay -J299
=> Page
01-53
.

Important note:

The secondary air pump relay is only activated for approx. 10 seconds, so it may be necessary to start final control element diagnosis several times (switch ignition off and back on again).

The secondary air pump relay should pick up and secondary air pump motor -V101 should run. (Relay is located in relay position 2 in 3-way relay carrier in electronics box on left side of plenum chamber).

A - If the relay does not pick up:

Test voltage supply of secondary air pump relay => Page
24-135
.
Test activation of secondary air pump relay => Page
24-138
.

B - If the relay picks up but the secondary air pump motor does not run:

Test voltage supply of secondary air pump motor =>Page
24-140
.

Testing voltage supply of secondary air pump relay

Disconnect secondary air pump relay.
Connect multimeter (voltage test range) as follows:

3-way relay carrier (electronics box in plenum chamber) socket position 2: / contact · Test against /
8 · Engine earth

Specification: approx. battery voltage

Note:

The contact cells of the relay carrier in which the contacts are located are numbered on the relay carrier.

If the specification is not obtained:

Carry out the following tests (marked with dots):

Test fuse for secondary air pump relay.

=> Current flow diagrams, Electrical fault finding and Fitting locations binder

Test for open circuit in wiring from battery + (terminal 30) to secondary air pump relay -J299 (located in relay position 2 of 3-way relay carrier in electronics box in plenum chamber.)

=> Current flow diagrams, Electrical fault finding and Fitting locations binder

Connect multimeter (voltage measurement range) as follows:

3-way relay carrier (electronics box in plenum chamber) socket position 2: / contact · Test against /
4 · Engine earth

Operate starter briefly.
Specification: approx. battery voltage

If the specification is not obtained:

Carry out the following tests (marked with dots):

Test fuse No. S234 (in fuse box, socket 34).

=> Current flow diagrams, Electrical fault finding and Fitting locations binder

Test for open circuit in wiring from secondary air pump relay -J299 (contact 4) to fuel pump relay.

=> Current flow diagrams, Electrical fault finding and Fitting locations binder

Note:

The contact cells of the relay carrier in which the contacts are located are numbered on the relay carrier.

Testing activation of secondary air pump relay

Switch off ignition.
Disconnect secondary air pump relay.
Connect voltage tester V.A.G 1527 B as follows:

3-way relay carrier (electronics box in plenum chamber) socket position 2: / contact · Test against /
6 · Battery positive

Start final control diagnosis and select secondary air pump relay -J299
=> Page
01-53
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The LED should light up for about 10 seconds.

If the LED does not light up:

Switch off ignition.
Connect test box V.A.G 1598/31 to wiring harness for engine control unit. Do not connect to the engine control unit itself.
=> Page
24-26
.

Note:

The contact cells of the relay carrier in which the contacts are located are numbered on the relay carrier.

Test for open circuit and short to positive or earth in the following wiring connection:

3-way relay carrier (electronics box in plenum chamber) socket position 2: / contact · Test box V.A.G 1598/31 / socket
6 · 72

Resistance in wiring: max. 1.5 Ohm

Rectify any open/short circuit as necessary.

=> Current flow diagrams, Electrical fault finding and Fitting locations binder

If no fault is found:

Fit a new secondary air pump relay -J299.

Testing voltage supply to secondary air pump motor

Note:

The secondary air pump motor is located behind the engine noise insulation (right side in direction of travel).

-1-: Connector for secondary air pump motor;

-2-: Secondary air pump motor.

Unplug connector from secondary air pump motor -V101.
Connect voltage tester V.A.G 1527 B between contacts 1 and 2.
Start final control diagnosis and select secondary air pump relay -J299
=> Page
01-53
.
The LED should light up for about 10 seconds.

If the LED does not light up:

Carry out the following tests (marked with dots):

Test for open circuit in wiring from connector for secondary air pump motor -V101 to secondary air pump relay -J299 (located in 3-way relay carrier in electronics box in plenum chamber, socket position 2)

=> Current flow diagrams, Electrical fault finding and Fitting locations binder

Test for open circuit in wiring from connector for secondary air pump motor -V101 to earth connection in engine compartment harness

=> Current flow diagrams, Electrical fault finding and Fitting locations binder

If no fault is found, replace secondary air pump relay:

If the LED lights up, but the secondary air pump does not start with connector plugged in (start final control diagnosis again):

Renew secondary air pump motor -V101.