Volkswagen Golf / Golf GTI / Jetta. Manual — part 101

26-42

- Remove intake hose between Mass Air Flow

(MAF) sensor and throttle valve control module:

Repair Manual, 2.8 Liter VR6 4V Fuel Injection

& Ignition, Engine Code(s) BDF, Repair Group
24

- Pull vacuum hose off Secondary Air Injection

(AIR) solenoid valve -N112- and combi-valve
(arrow).

- Connect hand vacuum pump VAG 1390 to

vacuum hose from combi-valve (arrow).

Secondary air system

26-43

When the combi-valve does not
open or is continuously open:

- Disconnect pressure hose to

combi-valve at coupling (arrow)
and blow in using light pressure.

Combi-valve must be closed.

- Operate hand vacuum pump.

Combi-valve must open.

- Replace combi-valve

Page 26-

25

, item - 5 -.

Secondary air system

26-44

EVAP system, checking using KLI 9210
tester

Introduction

The KLI 9210 EVAP tester allows testing using

nitrogen to pressurize the EVAP system and a
smoke generator or ultrasonic tester to locate the
source of EVAP system concerns.

This procedure is intended as a general guide for

the use of the EVAP tester. EVAP systems vary
between models.

Special tools and equipment

VAS 5051 or VAS 5052 diagnostic tester

KLI 9210 EVAP system tester (set to 14 in.

H

2

O)

Light source (for viewing smoke)

Special tool 3094 or equivalent

Using the KLI 9210 EVAP system tester

Tester operating instructions

Secondary air system

26-45

Calibrating the KLI 9210 tester

Determine the vehicle leak threshold:

Up to and including M.Y. 1999 leak

threshold = 0.040 in.

From M.Y. 2000 leak threshold = 0.020 in.

Testing the fuel cap

- Attach test hose to appropriate pre-set port

(black arrows).

- Turn control valve from "Hold" to "Test".

- Set flow meter flag (white arrow) at indicated

value on flow meter.

- Turn control valve to "Hold"; remove test hose.

- Remove fuel cap.

- Connect fuel cap receiver (arrow) to hose.

- Screw fuel cap tightly to cap receiver.

- Turn control valve to "Test" pressurizing cap.

- Turn valve to "Hold".

- Watch pressure gauge for drop in pressure from

14 inches H

2

O.

Secondary air system