Air Injection Pump: Testing and Inspection
Secondary air injection pump motor, checking
Special tools, testers and auxiliary items
^ VAG 1598/18 test box
^ VW1 1594 connector test kit
^ VAG 1 527B voltage tester
Checking requirement
^ Secondary Air Injection (AIR) pump relay fuse OK
Checking sequence
^ Switch ignition OFF.
^ Connect VAG1 598/18 test box to ECM wiring harness connector.
^ Disconnect pressure line from pneumatic valve.
^ Switch ignition ON.
^ Bridge test box sockets 01 and 06 using jumper wires from VW1 594 adaptor kit.
^ Connect test box terminals 49 to Ground using jumper wires from VW1 594 adaptor kit.
Pump motor must run and air must exit the pressure line.
If pump motor runs, but no air exits hose:
^ Check pressure line, and if necessary replace pump motor.
If pump motor does not run:
^ Disconnect pump motor harness connector.
^ Connect VAG1527B LED tester to disconnected connector using jumper wires from VW1594 adaptor kit.
LED tester must light up.
If tester lights up (voltage supply OK):
^ Replace pump motor.
If tester does NOT light up:
^ Check wiring between test box socket 49 and pump relay using wiring diagram.
^ Check activation of relay and wiring to pump motor using wiring diagram.
^ Reconnect 2-pin harness connector.
^ Check DTC memory, then erase.