Safety Warning
DIY auto repair can cause serious injury, fire, or vehicle damage. These guides are for informational purposes only. Always follow OEM torque specs, wear PPE, and consult a certified mechanic if you are unsure. You are solely responsible for your safety.
SYS.OK|MANUAL.DB● LIVE
HOMESERVICE MANUALSAUDI199590 QUATTRO SPORT V6-2.8L (AAH)REPAIR AND DIAGNOSISPOWERTRAIN MANAGEMENTEMISSION CONTROL SYSTEMSRELAYS AND MODULES - EMISSION CONTROL SYSTEMSAIR INJECTION PUMP RELAYTESTING AND INSPECTION
1995 Audi 90 Quattro Sport V6-2.8L (AAH)
Air Injection Pump Relay: Testing and Inspection
1995 Audi 90 Quattro Sport V6-2.8L (AAH)SECTION Testing and Inspection
REQUIREMENTS
^ Fuel pump relay OK.
^ Secondary Air Injection (AIR) pump relay fuse OK.
NOTE:
The secondary air injection pump relay is located in the fusel relay panel in the right front footwell, relay position -5-.
The fuse for the secondary air injection pump relay is located in fuse position -8-.
CHECKING RELAY POWER SUPPLY
- Switch ignition OFF.
- Remove lower right -A- pillar cover.
- Pull back carpet in right front footwell.
- Pull secondary air injection pump relay out of the relay panel, relay position -5-.
- Connect VAG 1527B voltage tester between terminal 2 of the relay socket and Ground (GND).
^ LED must light up
- Connect VAG 1527B voltage tester between terminal 6 of the relay socket and GND.
^ When starter is operated, LED must light up.
If LED does not light up:
- Repair corresponding open circuit in wiring using wiring diagram.
CHECKING RELAY ACTUATION
- Switch ignition ON.
- Connect VAG 1527B voltage tester between relay socket terminals 2 and 4.
^ LED must dimly light up.
- Initiate output DTM and actuate AIR pump relay -J299-. Refer to On-Board Diagnostics. MMS 311 Engine Management System
^ LED must brighten up for approximately 10 seconds, then dim again.
If LED lights up brighter after actuation (actuation OK):
- Replace secondary air injection pump relay -J299-.
If LED lights up brightly the entire time or does not light at all:
- Check wiring to relay.
CHECKING WIRING TO RELAY
- Connect VAG 1598 test box to wiring harness using adapter cable VAG 1598/11. Refer to VAG 1598 Pin Out Box Connecting. Connecting VAG 1598/31 Test Box
- The adapter harness for ECM is not connected.
If LED lights up continuously bright during relay actuation:
- Check wiring for short circuit to Ground (GND) between relay panel terminal 4 and VAG 1598 test box socket 6.
If LED does not light up during relay actuation:
- Check wiring for continuity between terminal 4 and VAG 1598 test box socket 6.
- If necessary, repair short circuit to GND or open circuit in wiring between relay panel terminal 4 and ECM connector C terminal 6.
If wiring is OK:
- Replace ECM.
^ Fuel pump relay OK.
^ Secondary Air Injection (AIR) pump relay fuse OK.
NOTE:
The secondary air injection pump relay is located in the fusel relay panel in the right front footwell, relay position -5-.
The fuse for the secondary air injection pump relay is located in fuse position -8-.
CHECKING RELAY POWER SUPPLY
- Switch ignition OFF.
Lower Pillar Cover:
- Remove lower right -A- pillar cover.
- Pull back carpet in right front footwell.
- Pull secondary air injection pump relay out of the relay panel, relay position -5-.
- Connect VAG 1527B voltage tester between terminal 2 of the relay socket and Ground (GND).
^ LED must light up
- Connect VAG 1527B voltage tester between terminal 6 of the relay socket and GND.
^ When starter is operated, LED must light up.
If LED does not light up:
- Repair corresponding open circuit in wiring using wiring diagram.
CHECKING RELAY ACTUATION
- Switch ignition ON.
- Connect VAG 1527B voltage tester between relay socket terminals 2 and 4.
^ LED must dimly light up.
- Initiate output DTM and actuate AIR pump relay -J299-. Refer to On-Board Diagnostics. MMS 311 Engine Management System
^ LED must brighten up for approximately 10 seconds, then dim again.
If LED lights up brighter after actuation (actuation OK):
- Replace secondary air injection pump relay -J299-.
If LED lights up brightly the entire time or does not light at all:
- Check wiring to relay.
CHECKING WIRING TO RELAY
- Connect VAG 1598 test box to wiring harness using adapter cable VAG 1598/11. Refer to VAG 1598 Pin Out Box Connecting. Connecting VAG 1598/31 Test Box
- The adapter harness for ECM is not connected.
If LED lights up continuously bright during relay actuation:
- Check wiring for short circuit to Ground (GND) between relay panel terminal 4 and VAG 1598 test box socket 6.
If LED does not light up during relay actuation:
- Check wiring for continuity between terminal 4 and VAG 1598 test box socket 6.
- If necessary, repair short circuit to GND or open circuit in wiring between relay panel terminal 4 and ECM connector C terminal 6.
If wiring is OK:
- Replace ECM.
RENDER: 1.0x
NO RELATED
Recommended Tools & Savings
Use the Manual With the Right Hardware
Pair factory procedures with proven DIY tools so the instructions are easier to execute.
Affiliate disclosure: We may earn a commission at no extra cost to you.
When to See a Mechanic
Stop DIY work and contact a certified mechanic immediately if any of the following apply:
- • You smell fuel, burning insulation, or see smoke.
- • Brakes feel soft, pull hard to one side, or make grinding noises.
- • The engine overheats, stalls repeatedly, or misfires under load.
- • You are missing required tools, torque specs, or safe lifting equipment.
- • You are not confident in the next step or safety outcome.