Component Tests and General Diagnostics: Overview

Electrical Testing





Special Tools And Equipment
^ VAG 1598/21 adapter
^ VW1594A connector test kit
^ Multimeter (Fluke 83 or equivalent)
^ VAG1921 pliers

^ If On Board Diagnostic (OBD) does not give any indication of the source of the malfunction, carry out all of the electrical test steps.
^ If On Board Diagnostic (OBD) provides a direct indication of the source of the malfunction, only carry out the test steps recommended in the DTC table (specific testing).

An overview of all the test steps in the Electrical test table, refer to Multi-Pin Harness Connector With Terminal Assignment. Multi-Pin Harness Connector With Terminal Assignment

Requirements
^ Ignition and electrical consumers switched off before beginning the check (headlights, lighting, fan, etc.)
^ Fuses -S9-, -S13-, -S20-, -S178-, -S179- must be OK (remove fuses from fuse holder to check)

Removing air cleaner





- Pull harness connector -2- off Mass Air Flow (MAF) sensor.
- Release spring-type clip -1- on air duct hose using VAG1921 pliers and pull hose off air cleaner.
- Remove air cleaner bolts -3- and take out air cleaner -4-.





- Release control module harness connector (arrow -1-) and pull off (arrow -2-).





- Pull multi-pin harness connector off ABS control module -J104- and connect VAG 1598/21 test box (-1-) to harness connector -2-,

The specified values are matched to the multimeter (Fluke 83 or equivalent) and are not necessarily applicable for other test units.