Volkswagen Corrado (1993 year). Manual - part 115

 

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Volkswagen Corrado (1993 year). Manual - part 115

 

 

D - ADJUSTMENTS 

         1993 ENGINE PERFORMANCE
         On-Vehicle Adjustments

         Corrado SLC

         ENGINE MECHANICAL

         Before performing any on-vehicle adjustments to fuel or
ignition systems, ensure engine mechanical condition is okay.

         VALVE CLEARANCE

NOTE:    All models use hydraulic lifters. No adjustments are
         required.

         IGNITION TIMING

NOTE:    See ENTERING SELF-DIAGNOSTICS in the G - TESTS W/CODES
         article in this section for additional scan tester
         operating instructions.

         VR6 IGNITION TIMING

         1) Start and warm engine to normal operating temperature.
Ensure engine oil temperature is 176

ø

F (80

ø

C). Ensure A/C and

electrical loads are off, including cooling fan.
         2) Connect engine analyzer to engine. Connect Scan Tester
(VAG 1551) to Data Link Connectors (DLC) located in center console, in
front of shift lever. Ensure no Diagnostic Trouble Codes (DTC) are
stored.
         3) Ensure throttle position sensor is properly adjusted.
Ensure idle air control valve is okay. Valve must vibrate or hum.
Connect CO tester using Adapter (VAG 1363/3) on CO tap tube. DO NOT
remove oxygen sensor. Ensure exhaust system has no leaks.
         4) Start engine and let it run at closed throttle (less than
1500 RPM). Operate scan tester and observe display. Press "1" button
to select RAPID DATA TRANSFER function. Press "Q" button to enter
input. Press right arrow button.
         5) Press "0" and "1" buttons to select ENGINE ELECTRONICS
function. Press "Q" button to enter input. Press right arrow button,
then "0" and "4" buttons to select BASIC SETTING function. Press "Q"
button to enter input.
         6) Press "0" and "1" buttons to select INPUT DISPLAY GROUP
NUMBER 01. Press "Q" button to enter input. Scan tester will display
SYSTEM IN BASIC ADJUSTMENT 1 through 4. Briefly increase engine speed
and then let it run for 2 minutes at closed throttle. Scan tester
displays idle speed in field one and ignition timing in field four.
Check CO level on CO tester.
         7) When radiator cooling fan stops running, end basic setting

D - ADJUSTMENTS 

         IDLE SPEED & MIXTURE

NOTE:    Mixture adjustment is NOT a part of normal tune-up procedure
         and should not be performed unless mixture control unit is
         replaced or vehicle fails emissions testing.

NOTE:    Ensure fuel system pressure is correct before attempting
         idle speed or mixture adjustment.

         VR6 IDLE SPEED & MIXTURE ADJUSTMENT

         See VR6 IGNITION TIMING under IGNITION TIMING near the
beginning of this article.

         THROTTLE BODY

         THROTTLE BODY ADJUSTMENT

CAUTION:  Throttle limiting (stop) screw is set by manufacturer and
          should NOT be moved. If screw is accidentally turned,
          perform throttle body adjustment.

         If stop screw for basic throttle adjustment has been moved,
replace throttle body.

         DASHPOT

         Open and close throttle until dashpot piston contacts roller.
With throttle in this position, check gap between limiter (stop) screw
and throttle. Gap between limiter (stop) screw and throttle lever must
be 0.10-0.14" (2.5-3.5 mm).

         IDLE & FULL THROTTLE SWITCHES

         THROTTLE POSITION (TP) SENSOR ADJUSTMENT

         1) Connect Scan Tester (VAG 1551) to Data Link Connectors
(DLC) located in center console, in front of shift lever. Turn
ignition on. Operate scan tester and select RAPID DATA TRANSFER,
ENGINE ELECTRONICS, then READ MEASURING VALUE BLOCK functions.
         2) Press "0" and "3" buttons to select INSERT DISPLAY GROUP
NUMBER 03 function. Press "Q" button to enter input. Slowly open
throttle, while observing display in channel 3, until throttle is wide
open. Numerical value must increase uniformly over entire opening

D - ADJUSTMENTS 

END OF ARTICLE

DEFOGGER - REAR WINDOW 

         1993 ACCESSORIES & EQUIPMENT
         Volkswagen Rear Window Defoggers

         Volkswagen;  Cabriolet, Corrado SLC, EuroVan,
         Fox, Golf, GTI, Jetta, Passat

         DESCRIPTION & OPERATION

         Ignition must be on for rear window defogger to operate.
Power to control switch is applied through fuse in fuse block. An
indicator light in the control switch comes on when the defogger is
turned on. Control switch also provides power to heating element in
both outside mirrors.

         TROUBLE SHOOTING

         DEFOGGER DOES NOT WORK

         Check for blown fuse, defective defogger switch, open wiring
or poor connections. Check for breaks in rear window defogger grid.
See FILAMENT TEST under TESTING.

         INDICATOR LIGHT DOES NOT WORK

         Check for burned bulb, blown fuse, open wiring or poor
connection.

         TESTING

         SYSTEM TEST

         Ensure and control switch are okay. Turn ignition and control
switch on. After a few minutes, feel glass for warmth. If glass is not
warm, use a test light to check for battery voltage at grid feed wire.
If no voltage is present, check control switch.

         FILAMENT TEST

         1) To locate breaks in grid filaments, connect test light
negative lead to ground side of grid. Touch opposite (positive) side
of grid with test light probe. If test light glows, grid line is okay.
Test light will glow dimmer as probe is moved toward ground side of
grid.
         2) If test light does not glow, grid line is broken. To
locate break, move probe along grid line toward ground side of heat
grid until test light glows, indicating area of damage.

         WIRING DIAGRAMS

 

 

 

 

 

 

 

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