Checking secondary air pump relay: Audi 2.8 (ACK, ALG)

ALG
Special tools,
testers and auxiliary items required

V.A.G 1526 A
V.A.G 1527 B
V.A.G 1594 A
V.A.G 1598/22

Test requirements:

Final control diagnosis has been performed

Operate starter briefly.
Secondary air pump motor -V101 must start up

If secondary air pump motor -V101 does not start up:

Checking power supply

Pull plug off secondary air pump motor -V101.
Connect voltage tester V.A.G 1527 B as follows:

Connector / contact · Measure to
2 · Engine earth

Operate starter briefly.
The LED should light up.

If LED lights, but motor did not run on actuating starter:

Fit a new secondary air pump motor -V101:

=> 6-cylinder Engine (5-valve), Mechanical Components Repair Group 26; Secondary air system, Removing and installing secondary air system components

If the LED does not light up:

Carry out the following tests (marked with dots):

Check fuse S2 (in fuse holder, fuse carrier ST4 - blue).
Check fuse S130 (60 A) in fuse holder.
Check fuel pump relay => Page
24-50
.

Check for open circuit in wiring between connector at motor -V101 and secondary air pump relay -J299 (in relay and fuse carrier, electronics box, plenum chamber, position 4).

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

Check for open circuit in wiring between battery + (terminal 30) and fuse S130 (in fuse holder) as well as between fuse S130 and secondary air pump relay -J299 (in relay and fuse carrier, electronics box, plenum chamber, position 4).

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

If wiring is OK, check actuation of secondary air pump relay -J299.

Checking actuation

Pull off secondary air pump relay -J299.
Connect the multimeter to contact 4 of relay socket and earth to measure voltage.
Operate starter briefly.
Specification: approx. battery voltage

If the specification is not obtained:

Check fuel pump relay => Page
24-50
.

If the specification is obtained:

Switch off ignition.
Connect test box V.A.G 1598/22 to wiring harness for engine control unit
=>Page
24-24
.

Check for open circuit and short to positive or earth in the following wiring connections:

Relay and fuse carrier, electronics box, plenum chamber, position 4 / contact · Test box V.A.G 1598/22 / / / socket
6 · 30

Rectify short circuit or open circuit if necessary.
If wiring is OK, fit a new secondary air pump relay -J299.