V8 Quattro V8-3562cc 3.6L DOHC (PT) (1990)
Data Link Connector: Description and Operation
DESCRIPTION
The Data Link Connectors (DLC) serve as the interface between the Engine Control Module (ECM), Transmissiom Control Module (TCM) and
the diagnostic equipment used for retrieving fault code information.
There are three main signals conducted by the DLC's
^
Exciter Signal
^
Blink Code Output Signal
^
Diagnostic Signal
The Data Link Connectors are made up of 4 separate connectors with 2 pins each.
1
Black Connector - Power supply
Pin 1 to Ground
Pin 2 to power from fuse 27
2
Black Connector - Rapid data tranfer for Scan Tool
Pin 1 to ECM Terminal 13 & TCM Terminal 15
Pin 2 to ECM Terminal 55 & TCM Terminal 51
3
Brown Connector - Instrument cluster diagnosis
Pin 1 unassigned
Pin 2 to Instrument Cluster
4
Yellow Connector - Blink code output
Pin 1 unassigned
Pin 2 to ECM Terminal 22
VW Special Tool VAG 1551
The VAG 1551 tester may be used to retrieve Diagnostic Trouble Codes (DTC).