Audi Workshop Service and Repair Manuals

Checking secondary air pump relay -J299- and activation

Special tools and workshop equipment required

t	Hand-held multimeter -V.A.G 1526 A-

t	Voltage tester -V.A.G 1527 B-

t	Auxiliary measuring set -V.A.G 1594 A-

t	Test box -V.A.G 1598/31-

t	Vehicle diagnosis, testing and information system -VAS 5051-

Test sequence l  Vehicle diagnostic, testing and information system -VAS 5051- is connected; vehicle self-diagnosis and vehicle system “01 - Engine electronics” is selected.

Display on -VAS 5051-: –  From menu -1- select diagnosis function “03 - Final control diagnosis”. –  Press the → button until the secondary air pump relay -J299- is activated.

l  The secondary air pump relay -J299--item 2- (located in electronics box in plenum chamber) should pick up and the secondary air pump motor -V101- should start up intermittently. –  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 for secondary air pump relay -J299- –  Detach rubber seal of plenum chamber cover in direction of arrow. –  Detach plenum chamber cover -1- towards the front.

–  Lever off both cover caps -3- with a screwdriver. –  Loosen hexagon nuts -4- several turns. –  Detach wiper arms -2- from wiper shafts by tilting slightly. –  Completely unscrew hexagon nuts and remove wiper arms. –  Pull off retaining clips -1- and detach cowl panel grille -5-.

–  Remove cover for electronics box in plenum chamber -arrows-.

–  Use screwdriver to pry off retaining strap for engine control unit -arrows- and lay control unit aside. –  If fitted, unclip retaining strap for gearbox control unit and lay control unit aside.

–  Disconnect secondary air pump relay -J299--Item 3-.

–  Connect multimeter (voltage measurement range) as follows:

Relay carrier in plenum chamber electronics box, position 2 Contact	Measure against
-8-	Engine earth

l  Specification: approx. battery voltage If specification is not obtained: –  Perform the following checks:

t  Check secondary air pump fuse -S130- (40 A) in plenum chamber electronics box, position -B-. t  Check for open circuit in wiring connection leading from battery + (terminal 30), via secondary air pump fuse -S130-, to secondary air pump relay -J299- (in relay and fuse holder, in plenum chamber electronics box, position 2) → Current flow diagrams, Electrical fault finding and Fitting locations.

–  Connect multimeter (voltage measurement range) as follows:

Relay carrier in plenum chamber electronics box, position 2 Contact	Measure against
-4-	Engine earth

–  Operate the starter briefly. l  Specification: approx. battery voltage –  Switch off ignition. If specification is not obtained: –  Perform the following checks:

t  Check fuse in fuse holder -S234- (position 34). t  Check for open circuit in wiring from secondary air pump relay -J299- (on 3-position relay carrier in electronics box in plenum chamber) via fuse in fuse holder -S234- (position 34) to fuel pump relay → Current flow diagrams, Electrical fault finding and Fitting locations.

Checking activation of secondary air pump relay -J299- –  Disconnect secondary air pump relay -J299-. –  Connect voltage tester -V.A.G 1527 B- as follows:

Relay carrier in plenum chamber electronics box, position 2 Contact	Measure against
-6-	Engine earth

Display on -VAS 5051-: –  From menu -1- select diagnosis function “03 - Final control diagnosis”. –  Press the → button until the secondary air pump relay -J299- is activated. l  The LED should flash. –  Switch off ignition. If the LED does not flash:

–  Connect test box -V.A.G 1598/31- to connectors of wiring harness; do not connect engine control unit. Connect earth clamp of test box to earth (not shown in illustration) → Motronic injection and ignition system (6-cyl.); Rep. Gr.24.

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

Relay carrier in plenum chamber electronics box, position 2 Contact	Test box -V.A.G 1598/31- Socket
-6-	46

–  If necessary repair wiring connection. If no fault is found: –  Renew secondary air pump relay -J299-.

Checking voltage supply for secondary air pump motor –  Vehicles with auxiliary heater: remove bolts -arrows- securing exhaust pipe for auxiliary/additional heater to noise insulation.

–  Release bolts or quick-release fasteners -1- and -2- and take off front noise insulation.

–  Unplug electrical connector -2- at secondary air pump motor -V101--item 1-.

–  Connect voltage tester -V.A.G 1527 B- between contacts -1- and -2-.

Display on -VAS 5051-: –  From menu -1- select diagnosis function “03 - Final control diagnosis”. –  Press the → button until the secondary air pump relay -J299- is activated. l  The LED should flash. –  Switch off ignition. If the LED does not flash: –  Perform the following checks: t  Check for open circuit in wiring from contact 2 of connector to secondary air pump relay -J299- (on relay carrier in plenum chamber electronics box, position 2) → Current flow diagrams, Electrical fault finding and Fitting locations. t  Check for open circuit in wiring from contact 1 of connector to earth → Current flow diagrams, Electrical fault finding and Fitting locations. If no fault is found: –  Renew secondary air pump motor -V101-.