Air Injection Pump Relay: Testing and Inspection

Secondary Air Injection (AIR) Pump Relay -J299- And Activation, Checking

Special Tools and Equipment






- VAG1526A
- VAG1527B
- VAG1594A
- VAG1598/31
- VAS5051 with VAG5051/1

Test requirement:
- VAS5051 tester connected and vehicle On Board Diagnostic (OBD) -01 Engine electronics- selected.

Test sequence
- Initiate output Diagnostic Test Mode (DTM) and activate Secondary Air Injection (AIR) Pump Relay -J299-.
- Secondary Air Injection (AIR) Pump Relay -2- (in E-box, at left in plenum chamber) must engage and Secondary Air Injection (AIR) Pump Relay -J299- must run in intervals

A - does not engage the relay:
- Check voltage supply of Secondary Air Injection (AIR) Pump Relay.






- Checking activation of Secondary Air Injection (AIR) Pump Relay.

B - If relay triggers, but Secondary Air Injection (AIR) Pump Motor does not run:
- Check voltage supply of Secondary Air Injection (AIR) Pump Motor.

Checking voltage supply of Secondary Air Injection (AIR) Pump Relay

- Switch ignition off.






- Pull off rubber seal of plenum chamber cover in direction of arrow.
- Remove plenum chamber cover -1- toward front.






- Remove E-box cover in plenum chamber -arrows-.






- Remove Secondary Air Injection (AIR) Pump Relay -2-.






- Connect multimeter for voltage measurement as follows.

Relay carrier in E-box, plenum Measure to
chamber, position 3

Terminal
8 Engine Ground (GND)

- Specification: approx. battery voltage

If specified value is not obtained:
- Perform the following tests marked with dots:







- Check Fuse for secondary air pump -S130- (40 A) in E-Box, plenum chamber, position 4.
- Check wire connection from battery + via Fuse for secondary air pump -S130- to Secondary Air Injection (AIR) Pump Relay -J299- (in relay and fuse carrier in E-Box, plenum chamber, position 3) for open circuit.







- Connect multimeter for voltage measurement as follows.

Relay carrier in E-box, plenum Measure to
chamber, position 3

Terminal
4 Engine Ground (GND)

- Operate starter briefly.
- Specification: approx. battery voltage

If specified value is not obtained:
- Perform the following tests marked with dots:







- Check fuse in fuse holder -S234- (position 34).
- Check wire connection from Secondary Air Injection (AIR) Pump Relay -J299- (in 3-socket relay carrier in E-box, plenum chamber) via Fuse in fuse holder -S234- (position 34) to Fuel Pump (FP) relay for open circuit:

Check activation of the Secondary Air Injection (AIR) pump relay
- Switch ignition off.
- Remove Secondary Air Injection (AIR) pump relay







- Connect VAG1527B voltage tester as follows:

Relay carrier in E-box, plenum Measure to
chamber, position 3

Terminal
6 Engine Ground (GND)

- Initiate output Diagnostic Test Mode (DTM) and activate Secondary Air Injection (AIR) Pump Relay -J299-.
- LED must blink.

If LED does not blink:
- Switch ignition off.







- Connect VAG1598/31 test box to harness connectors of wiring harness (do not connect ECM). Connect Ground (GND) clip at test box (not visible in illustration) to Ground (GND).







- Check the following wire connection for open circuit and short circuit to Ground (GND) and B+:

Relay carrier in E-box, plenum VAG1598/31 test box
chamber, position 3

Terminal Socket
6 46

- Repair open circuit or short circuit if necessary.

If no malfunctions are detected:
- Replace Secondary Air Injection (AIR) pump relay -Secondary Air Injection (AIR) Pump Relay -J299-.