1997 AUDI A4 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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26-50

Checking internal resistance

- Disconnector connector of secondary air injection solenoid valve -
N112- (-Item 2-).

If specified value is not attained:
If specified value is attained: - Connect multimeter to injector to measure resistance.
Specified value: 27 to 30
- Replace secondary air injection solenoid valve -N112-.
- Check power supply.
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26-51

Checking power supply

Note:
The power supply for the secondary air injection
solenoid valve -N112- is via the fuel pump relay.

Test requirements:

Fuse for secondary air injection solenoid
valve OK.

Electrical Wiring Diagrams, Troubleshooting &
Component Locations binder

Fuel pump relay OK.

Repair Manual, 1.8 Liter 4
-Cyl. 5V Turbo Fuel
Injection & Ignition, Engine Code(s): AWM, Repair Group 24


- Disconnect connector from valve.

- Connect voltage tester VAG 1527 B as follows:Connector
Measure to
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contact
1 Engine Ground
- Operate starter briefly.
LED must light up.
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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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26-53
If the LED lamp does not flash or if it lights up
continuously:

- Connect VAG 1598/31 test box to wiring
harness leading to engine control module;
engine control module should not be connected:

Repair Manual, 1.8 Liter 4
-Cyl. 5V Turbo Fuel
Injection & Ignition, Engine Code(s): AWM, Repair Group 24


If the wiring is OK: - Check for open circuit and short to positive or Ground in following
wiring connection: Connector
contact
Test box VAG 1598/31
2 9
- Repair any open/short circuit as necessary.
- Replace engine control module.
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26-54


Secondary Air Injection (AIR) Pump relay -
J299- / Secondary Air Injection (AIR) Pump
motor -V101-, checking

Special tools and equipment

VAG 1526 A
VAG 1527 B
VAG 1594 A
VAG 1598/31
VAS 5051 with VAS 5051/1
- or
VAG 1551 with VAG 1551/3 A
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26-55

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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