Beetle L4-1.9L DSL Turbo (ALH) (1998)
Throttle Position Sensor: Testing and Inspection
With Manufacturer's Scan Tool
Throttle Position (TP) Sensor -G79- Checking
Throttle Position (TP) sensor -G79- is located on accelerator pedal and communicates physical pedal position to Diesel Direct Fuel Injection (DFI)
Engine Control Module (ECM).
Special tools
-
VAG 1551/1552 Scan Tool with VAG 1551/3 Adapter cable
-
VAG 1598/22 Test Box (MY 1999)
-
VAG 1598/31 Test Box (from MY 2000)
-
Fluke 83 multimeter, or equivalent
-
VW 1594 Adapter kit
Test sequence
-
Switch ON ignition but do not start engine.
-
Press 0 and 1 buttons to select Address word 01: "Engine electronics"
Display will appear as shown (example only)
038906018M 1.9l R4 EDC 00AG 1813
->
Coding 0001
WSC XXXXX
-
Press -> button.
Display will appear as shown
Rapid data transfer
HELP
Select function XX
-
Press 0 and buttons to select Function 08:"Read measuring value block".
-
Press Q button to enter input.
Display will appear as shown
Read measuring value block
HELP
Input Display group number XXX
-
Press 0, 0 and 2 buttons to select "Display group 2".
-
Press Q button to enter input.
-
Observe value in Display zone 2 (Throttle Position).
Specification: 0.0 % (pedal not operated)
Read measuring value block 2
->
0 rpm
0.0%
0 1 0
18.4 5C
-
Observe value in Display zone 3.
Specification:
0 1 0 (pedal not operated)
0 0 0 (pedal operated)
Read measuring value block 2
->
0 rpm
0.0%
0 1 0
18.4 5C
-
Press accelerator pedal down slowly.
Specification: value in zone 2 must increase steadily up to 100 % (pedal fully depressed).
Read measuring value block 2
->
0 rpm
100.0%
0 0 0
18.4 5C
On vehicles with an automatic transmission, the kickdown switch pressure point must be distinctly felt before the Wide Open Throttle stop position is