Volkswagen Golf / Golf GTI / Jetta. Manual — part 85

20-60

Leak Detection Pump (LDP) -
V144-, checking

Special tools and equipment

VAG 1526 A multimeter, Fluke

83 multimeter or equivalent

VAG 1594 Adapter set

Evaporative Emissions (EVAP) system

20-61

Test conditions

No DTCs may be stored in DTC memory:

Repair Manual, 2.8 Liter VR6 4V Fuel Injection

& Ignition, Engine Code(s): BDF, Repair Group
01

Checking activation

- Check activation of LDP -V144- via output

Diagnostic Test Mode (DTM):

Repair Manual, 2.8 Liter VR6 4V Fuel Injection

& Ignition, Engine Code(s): BDF, Repair Group
01

If activation is OK:

- Check resistance at LDP -V144-

Page 20-

62

.

Evaporative Emissions (EVAP) system

20-62

Checking resistance

- Remove rear right wheel housing

liner:

Repair Manual, Body Exterior,

Repair Group 66

- Disconnect 3-pin connector

(arrow) for Leak Detection Pump
(LDP) -V144-.

- Connect multimeter to measure

resistance between contacts 1
and 3 of LDP -V144- using
adapter cables from VAG 1594 A.

Specification: 640...720

- Connect multimeter to measure

resistance between contacts 2
and 3 of LDP -V144- using
adapter cables from VAG 1594 A.

Specification: 12.5...19.5

Evaporative Emissions (EVAP) system

20-63

If the specifications are not attained:

- Replace Leak Detection Pump (LDP) -V144-

Page 20-42

, item - 7 -.

- Check DTC memory:

Repair Manual, 2.8 Liter VR6 4V Fuel Injection

& Ignition, Engine Code(s): BDF, Repair Group
01

- Read readiness code:

Repair Manual, 2.8 Liter VR6 4V Fuel Injection

& Ignition, Engine Code(s): BDF, Repair Group
01

- Generate readiness code again if DTC memory

has been erased or engine control module
separated from permanent positive supply.

Repair Manual, 2.8 Liter VR6 4V Fuel Injection

& Ignition, Engine Code(s): BDF, Repair Group
01

Evaporative Emissions (EVAP) system