Jetta GL L4-1.9L DSL Turbo (ALH) (2001)
Engine Control Module: Component Tests and General Diagnostics
With Manufacturer's Scan Tool
Diesel (DFI) Engine Control Module (ECM) Voltage Supply - J248-, Checking
Engine control module voltage supply, checking
Special tools and equipment
-
Digital multimeter US 1119 (Fluke 83 or equivalent)
-
VAG 1594 Adapter kit
-
VAG 1598/22 Test box (through my 1999)
-
VAG 1598/31 Test box (from my 2000)
-
Wiring diagram
Test conditions
-
Fuses No.29 and 32 OK.
-
Battery 11.5 Volts minimum.
-
All electrical consumers, e.g. lights and rear window defog must be switched off.
-
A/C switched off.
-
Selector lever in position "P" or "N" (automatic trans.).
Test sequence
-
Remove wiper arms and cowl panel
-
Connect test box VAG 1598/22 (through my 1999) or VAG 1598/31 (from my 2000) to Engine Control Module (ECM) -J248- wiring harness,
See: Computers and Control Systems/Testing and Inspection