Work step: 18, Diagnostic: Throttle valve control module

WARNING: This page does not describe the selected car, but rather 8 other vehicles, including the 1999 Volkswagen Jetta, 1999 Volkswagen GTI, 1998 Volkswagen Jetta, 1998 Volkswagen GTI, and 1997 Volkswagen Jetta. However, it is still accessible from the selected car via links, so may be relevant.

NOTE: There are no specifications for this diagnostic test. The values in display fields are typical. Obtaining other values does not indicate a system malfunction. The diagnostic functions run in the background during the check.

Display will appear as shown

Fig 1: Identifying Scan Tool Display - Function 15, Work Step 18 (1 Of 5)

Press -0- and -8- buttons to select "Read measuring value block" function 08.
Press -Q- button to enter input.

Display will appear as shown

Fig 2: Identifying Scan Tool Display - Function 15, Work Step 18 (2 Of 5)

Press -1-, -4- and -0- buttons to input display group 140.
Press -Q- button to enter input.

Display will appear as shown (1 to 4 = display fields)

Fig 3: Identifying Scan Tool Display - Function 15, Work Step 18 (3 Of 5)

Run engine at idle.

DISPLAY GROUP: 140, FUNCTION: 08

	Display fields
	1	2	3	4
Display group: 140, Function: 08
Display	x.xx ms	xx %	x.x V	xxxx xxxx
Indicated	Engine load	Current throttle motor position	Throttle position sensor voltage	Diagnostic conditions
Specification	1.4 to 2.4 ms	65 to 85 %	3.0 to 5.0 V	---

Press -3- button (VAG 1551 scan tool) or --> button (VAG 1552).

Display will appear as shown (1-4 = display fields)

Fig 4: Identifying Scan Tool Display - Function 15, Work Step 18 (4 Of 5)

Run engine at idle.

DISPLAY GROUP: 141, FUNCTION: 08

	Display fields
	1	2	3	4
Display group: 141, Function: 08
Display	xx %	xxx %	xxx	xxxx xxxx
Indicated	-	Target throttle motor position	Throttle position controller	Diagnostic conditions
Specification	65 to 85 %	65 to 85 %	90 to 170	---
	Actual position of throttle valve actuator	Throttle valve actuator specification	Throttle valve actuator integrator

Press -3- button (VAG 1551 scan tool) or "UP" button (VAG 1552).

Display will advance as shown (1 to 4 = display fields)

Fig 5: Identifying Scan Tool Display - Function 15, Work Step 18 (5 Of 5)

Run engine at idle.

DISPLAY GROUP: 142, FUNCTION: 08

	Display fields
	1	2	3	4
Display group: 142, Function: 08
Display	xx %	xx %	xx %	xxxx xxxx
Indicated	Throttle valve actuator	Throttle valve actuator	Throttle valve actuator	Diagnostic conditions
Specification	65 to 85 %	80 to 90 %	20 to 30 %	---
Specification	Throttle valve actuator emergency running cross section	Throttle valve actuator minimum stop	Throttle valve actuator maximum stop

press --> button