Passat L4-1984cc 2.0L DOHC (1991)
-
mount 3084 protractor on throttle body shaft (2nd stage) and fasten using magnetic adapter 3084/1
NOTE: If throttle shaft (2nd stage) is attached with a mounting nut, place the protractor without 3084/1 magnetic adapter on the throttle shaft and if
necessary remove the mounting nut
-
open throttle fully by hand
-
close throttle by approx. 30° then push slowly back in direction of full throttle stop (arrow), while doing so check switching point (0 Ohms) of
full throttle switch 2
-
switch point 10 ± 2° before full throttle stop
-
adjust switch point if necessary by moving full throttle switch 2 as necessary, then re-check
The following procedures are for vehicles with idle switch, full throttle switch and throttle potentiometer contained in one assembly located below the
throttle body.
Idle and full throttle switches, checking and adjusting
For vehicles built after 10-90 starting with control unit:
49 states 8A0 907 404
California:893 907 404Q
The idle and full throttle switches can also be checked using the VAG 1551 Diagnostic Tester, see functional check later in this section
-
If the potentiometer is replaced in a vehicle. with an automatic transmission, the automatic transmission control unit must "learn" the voltage
value of the new potentiometer by returning the system to its basic setting.
Idle and full throttle switches, checking
-
connect VAG 1501 test adaptor to idle/full throttle switch connector (white)
-
harness connector remains disconnected
-
switch Fluke 83 multimeter to resistance range
-
connect multimeter to adaptor leads 1 and using jumpers from VW 1594 adaptor kit
-
must be 0 Ohms
-
open throttle slightly
-
idle switch must switch OFF and resistance increase to infinite Ohms
-
slowly close throttle while checking switch point (0-Ohms) of idle switch with feeler gauge between throttle lever and idle stop (limiter screw)