Vehicles with non-adjustable throttle position sensor

WARNING: This page is about a different variant/trim than selected.

Test sequence

Connect scan tool V.A.G 1551 (VAG 1552) and select control module for engine electronics with the "address word" 01. For this, the ignition must be switched on: Refer to 01 ON BOARD DIAGNOSTIC (OBD) from M.Y. 99-01 or 01 ON BOARD DIAGNOSTIC (OBD) from M.Y. 2002 and on

Scan tool display:

Quick data transfer HELP
Select function XX

Press buttons 0 and 8 for the function "Reading measuring value blocks" and press Q button to confirm input.

Scan tool display:

Read measuring value block
Enter display group number XXX

Press buttons 0 0 and 2 for the "Display group number 2" and press Q button to confirm input.
Check reading of the throttle position in display field 2. The accelerator pedal must not be depressed for this. Specification: 0.0%

Read measuring value block 2
0/min 0.0% 0 1 0 18.4 ° C

Check reading for the idle switch in display field 3. The center digit must be set at 1. Reading: 0 1 0
Slowly depress the accelerator pedal and observe display fields 2 and 3.

Read measuring value block 2
0/min 100.0% 0 0 0 18.4

Display field 2: Throttle position value must increase continuously. Specified value for full throttle position: 100.0%
Display field 3: The center digit must jump to 0. Reading: 0 0 0

NOTE:

On vehicles with automatic transmission, the pressure point of the kick-down switch must be noticeable before the throttle reaches the wide open stop.

If specifications are not obtained:

Press → button
Press buttons 0 and 6 for the function "End output" and press Q button to confirm input.
Switch ignition off.
Check wiring for throttle position sensor G79 as follows:

Vehicles with 80-pin control module

Fig 1: Identifying Test Box V.A.G 1598/22 Connected To Control Module Wiring Harness

Courtesy of VOLKSWAGEN UNITED STATES, INC.

Fig 2: Identifying Control Module Wiring Harness Pins

Courtesy of VOLKSWAGEN UNITED STATES, INC.

Check for open circuits in wires between test box and connector according to wiring diagram. Terminal 2 + Socket 11 Terminal 3 + Socket 23 Terminal 4 + Socket 24 Terminal 5 + Socket 12 Terminal 6 + Socket 25 Vehicles with automatic transmission Terminal 1 + Socket 8 Harness resistance: max. 1.5 Ω
Check wires for short circuit to each other, to vehicle Ground (GND) and to B+. Specification: ∞ Ω

Vehicles with 121-pin control module

Fig 3: Identifying Test Box V.A.G 1598/31 Connect To Control Module Wiring Harness

Courtesy of VOLKSWAGEN UNITED STATES, INC.

Fig 4: Identifying Control Module Wiring Harness Pins

Courtesy of VOLKSWAGEN UNITED STATES, INC.

Check for open circuits in wires between test box and connector according to wiring diagram. Terminal 2 + Socket 12 Terminal 3 + Socket 50 Terminal 4 + Socket 69 Terminal 5 + Socket 70 Terminal 6 + Socket 51 Vehicles with automatic transmission Terminal 1 + Socket 63 Harness resistance: max. 1.5 Ω
Check wires for short circuit to each other, to vehicle Ground (GND) and to B+. Specification: ∞ Ω

Continue for all vehicles

If no malfunction is detected in the wiring: