ECO mode AUDI A4 1996 B5 / 1.G AWM Engine Secondary Air System Workshop Manual

26-49


- Connect auxiliary hose to valve connector marked with an arrow.
- Initiate output Diagnostic Test Mode (DTM) and activate secondary air
injection solenoid valve -N112-.
Output Diagnostic Test Mode Secondar
y air in
jection solenoid valve -N112-

Display:
If the injector does not click:
If valve does not open or close properly:
The valve should click ... ... and should open and close (check by blowing into the auxiliary
hose).
- Check internal resistance of valve.
- Replace secondary air injection solenoid valve -N112-.
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26-52
If the LED does not light up:

- Check wiring from contact 1 on the connector
via the fuse to the fuel pump relay for an open
circuit:

Electrical Wiring Diagrams, Troubleshooting &
Component Locations binder
- Repair open circuit, if necessary
If the LED lights up:

- Check actuation.

Checking actuation

- Connect voltage tester VAG 1527 B to contacts 1 (positive) and 2 of
connector.
- Initiate output Diagnostic Test Mode (DTM) and activate secondary air
injection solenoid valve -N112-.

LED must flash.
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Test requirements:

Vehicle diagnostic, testing and information
system VAS 5051 or VAG 1551 Scan Tool.

Test sequence

- Initiate output Diagnostic Test Mode (DTM) and
activate Secondary Air Injection Pump relay -
J299-.

A - If relay does not respond:
B - If relay responds but secondary air injection pump motor does not
run:
The secondary air injection pump relay-2- (in electronics box of
plenum chamber, left) must respond and secondary air injection pump
motor -V101- must run intermittently.
- Check voltage supply of secondary air pump relay Page 26
-56
.
- Check actuation of secondary air injection pump relay Page 26
-58
.
- Check voltage supply of secondary air injection pump motor Page
26
-60
.
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26-58

- Check for open circuit in wiring from
secondary air injection pump relay (in 3-
position relay carrier in E-box of plenum
chamber) via fuse S234 (in fuse box, position
34) to fuel pump relay.

Electrical Wiring Diagrams, Troubleshooting &
Component Locations binder
Check actuation of secondary air pump relay

- Switch ignition off.

- Remove secondary air injection pump relay.

- Connect voltage tester VAG 1527 B as follows:3-position relay carrier in E-box in plenum chamber,
position 2
contact
Measure to

6 Engine
Ground
- Initiate output Diagnostic Test Mode (DTM) and activate secondary air
injection pump relay.

LED must flash.
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If LED does not flash:
Electrical Wiring Diagrams, Troubleshooting & Component Locations
binder
Electrical Wiring Diagrams, Troubleshooting & Component Locations
binder
If no malfunction is found: - Connect voltage tester VAG 1527 B between contacts 1 and 2.
- Initiate output Diagnostic Test Mode (DTM) and activate Secondary Air
Injection (AIR) Pump relay -J299-.

LED must flash.
- Carry out following tests:
- Check wiring connection from contact 1 of connector to secondary air
injection pump relay (in 3-pin relay carrier in electronic box (plenum
chamber), for open circuit.
- Check wiring connection of contact 2 of connector to Ground for
open circuit: - Replace Secondary Air Injection (AIR) Pump motor -V101-.
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pair&id=AUDI.B5.GE06.26.2