battery AUDI A4 1998 B5 / 1.G EVAP Workshop Manual

20-156

Checking output wiring (vehicles with
electronic throttle control)

- Connect voltage tester VAG1527B as follows:Electrical connector terminal
Specification
2 Battery Positive
- Initiate Diagnostic Test Mode (DTM) Page 20
-146
.
-
Press button until following display is shown:
Output Diagnostic Test Mode LDP leak test

Indicated on display:
If LED does not blink:
LED must blink
- Switch ignition off.
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- Connect test box VAG1598/22 to harness connector. The ground
clamp (not visible in the illustration) must be connected to battery
ground connection. Do not connect ECM.

- Check the following wire connection for open circuit or short circuit to
Ground or plus (B+): Electrical connector terminal
Test box VAG1598/22 socket
2 25
- Repair wiring or short circuit if necessary.
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If flow stops:

- Replace EVAP purge regulator valve -N80- and
repeat test before continuing.
If meter indicates no flow after test:

- Perform a quality check and return vehicle to
customer.
If flow continues, proceed as follows:

Method 1: Locate leak with smoke generator

- Connect leads from smoke generator to vehicle
battery.

- Use smoke generator trigger to charge fuel
system with smoke.

- Inspect complete EVAP system for escaping
smoke.
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ge 52 of 65 EVAP s
ystem, servicin
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11/18/2002 htt
p://127.0.0.1:8080/audi/servlet/Dis
play?action=Goto&t
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e=re
pair&id=AUDI.B5.GE04.20.5