Beetle L4-1781cc 1.8L Turbo (APH) (1999)
Engine Control Module: Testing and Inspection
ECM Voltage Supply, Checking
With Manufacturer's Scan Tool
Engine Control Module (ECM) Voltage Supply, Checking
Special tools, test equipment and auxiliary items
-
Scan tool VAG 1551 or vehicle system tester VAG 1552 with cable VAG 1551/3B
-
Test box VAG 1598/31
-
Multimeter (Fluke 83 or equivalent)
-
Adapter set VAG 1594
-
Wiring diagram
Check conditions
-
Fuses 10 and 29 must be OK
-
The battery voltage must be at least 11.5 V
-
All electrical consumers, e.g. lights and rear window heating must be switched off
-
If the vehicle is equipped with an air conditioner, this must be switched off
-
Selector lever must be in position "P" or "N" on vehicles with an automatic gearbox
-
Alternator OK, checking:
Test sequence
-
Connect scan tool V.A.G 1551 (V.A.G 1552). Start engine and select "Address word" 01 of Engine Control Module (ECM). When doing this the
engine must be running at idle speed. Connecting scan tool and selecting Engine Control Module (ECM). Refer to "Scan Tool Testing/Scan Tool
Connecting and Initial Checks/VAG 1551 Scan Tool", See: Testing and Inspection
Indicated on display
Rapid data transfer
HELP
Select function XX
-
Press keys 0 and 8 for the function "Read measuring value block" and confirm entry with Q key.
Indicated on display
Read measuring value block
Input display group number XXX
-
Press keys 0, 0 and 4 for "Display group number 4" and confirm entry with Q key.
Indicated on display (1-4 = Display zones)
Read measuring value block 4
->
1
2
3
4