1993 VOLKSWAGEN CORRADO buttons

A/C-HEATER SYSTEM - MANUAL
Article Text (p. 2)
1993 Volkswagen Corrado
For Volkswagen Technical Site: http://vw.belcom.ru
Copyright © 1998 Mitchell Repair Information Company, LLC
Wednesday, March 22, 2000 08:49PM
* Disable air bag system before servicing any air bag system or
steering column component. See DISABLING & ACTIVATING AIR BAG
SYSTEM.
* Because of critical operating requirements of system, DO NOT
attempt to service any air bag system component.
* DO NOT leave air bag parts unattended. Install parts in vehicle
immediately after obtaining.
* DO NOT use air bag components that have been dropped from height
of more than 18 inches.
* DO NOT allow chemical cleaners, oil and grease to contact vinyl
covering on air bag unit.
* DO NOT place stickers or covers on steering wheel.
* Always disable air bag system before performing electric welding
on vehicle.
* Air bag system can only be tested using Diagnostic Tester (VAG
1551) and Multimeter (US-1119). Never use test light on air bag
system.
* DO NOT expose air bag unit to temperatures greater than 194øF
(90
øC).
DISABLING & ACTIVATING AIR BAG SYSTEM
WARNING: System voltage is retained for about 20 MINUTES after system
is deactivated. Wait about 20 MINUTES after system is
disabled before servicing, as air bag may accidentally
deploy, causing personal injury.
Disabling & Activating System
To disable system, disconnect negative battery cable. Wait 20
MINUTES before working on vehicle. To activate system, reconnect
negative battery cable. Verify system is functioning properly. See
SYSTEM OPERATION CHECK.
CAUTION: When battery is disconnected, radio will go into anti-theft
protection mode. Obtain radio anti-theft protection code
from owner prior to servicing vehicle.
DESCRIPTION
The air conditioning system is a cycling clutch type.
Compressor is cycled on and off by a thermostatic switch to maintain
constant cooling rate. System components include evaporator, expansion
valve, receiver-drier, control panel and condenser. A dual-pressure
switch includes a high-pressure cut-out switch and a low-pressure cut-
out switch.
Control panel includes 3 rotary knobs over 2 push buttons.
See Fig. 1. Left knob controls the fan and increases fan speed when
turned clockwise. Center knob is the temperature control and increases
heat by turning clockwise. Right knob controls air distribution.
The 2 push buttons are ON/OFF switches controlling A/C. Left
button controls normal A/C (outside air). Right button gives maximum
A/C using recirculating air. See Fig. 1.

D - ADJUSTMENTS
Article Text
1993 Volkswagen Corrado
For Volkswagen Technical Site: http://vw.belcom.ru
Copyright © 1998 Mitchell Repair Information Company, LLC
Wednesday, March 22, 2000 08:59PM
ARTICLE BEGINNING
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 176øF (80øC). 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
Article Text (p. 2)
1993 Volkswagen Corrado
For Volkswagen Technical Site: http://vw.belcom.ru
Copyright © 1998 Mitchell Repair Information Company, LLC
Wednesday, March 22, 2000 08:59PM
function by pressing right arrow button. Press "0" and "6" for END
OUTPUT function. Press "Q" button to enter input.
8) If idle speed, CO level or ignition timing is incorrect,
turn ignition off. Check accelerator pedal and throttle cable for ease
of operation. Check dashpot adjustment. Check throttle position
sensor, idle air control valve, and EGR valve.
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

G - TESTS W/CODES
Article Text (p. 5)
1993 Volkswagen Corrado
For Volkswagen Technical Site: http://vw.belcom.ru
Copyright © 1998 Mitchell Repair Information Company, LLC
Wednesday, March 22, 2000 09:11PMÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄ ENTERING SELF-DIAGNOSTICS
VAG ON-BOARD DIAGNOSTICS
NOTE: If VAG SELF-DIAGNOSIS (VAG ON-BOARD DIAGNOSTIC) display
does not appear on scan tester, check DLC terminals for
battery voltage and ground. Upper terminal should have
battery voltage, bottom terminals serve as ground.
Corrado SLC
1) Ensure battery voltage and fuses No. 18 and 22 are okay.
Ensure engine ground connections at cylinder head cover and at
manifold are okay.
2) Connect Scan Tester (VAG 1551) to Data Link Connectors
(DLC) located in center console, in front of shift lever. Attach Black
connector first, wait for VAG ON-BOARD DIAGNOSTIC display, then
connect White connector. DO NOT connect scan tester Blue connector.
3) Turn ignition on or start engine depending on function
being selected. See appropriate SELECTABLE FUNCTIONS table. Press "1"
button to select RAPID DATA TRANSFER function.
4) Press "0" and "1" buttons to select ENGINE ELECTRONICS
function. Press "Q" button to enter input. Electronic Control Module
(ECM) identification will be displayed on scan tester.
5) If CONTROL MODULE DOES NOT ANSWER message is displayed,
press HELP button to print a list of possible causes. With scan tester
in RAPID DATA TRANSFER function, press right arrow button. Press "02"
to "08" buttons to select desired function. Press "Q" button to enter
input.
SELECTABLE FUNCTIONS (CORRADO SLC) (1)
ÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄFunction Ignition On Engine On
02 (Read DTC/Fault Memory) .. ..... ............. X
03 (Output Check/
03 Diagnostic Test Mode) ...... X .......... .....
04 (Start Basic Setting) ..... ..... ............. X
05 (Erase DTC/Fault Memory) .. ..... ............. X
06 (End Output) ............... X ............... X
08 (Read Measuring Value Block) X ............... X
(1) - Press HELP button at any time to obtain additional
scan tester operating instructions.
ÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄ OUTPUT CHECK DIAGNOSIS (OUTPUT DIAGNOSTIC TEST MODE)
NOTE: See ENTERING SELF-DIAGNOSTICS for additional scan tester
operating instructions.

G - TESTS W/CODES
Article Text (p. 7)
1993 Volkswagen Corrado
For Volkswagen Technical Site: http://vw.belcom.ru
Copyright © 1998 Mitchell Repair Information Company, LLC
Wednesday, March 22, 2000 09:11PM
arrow button twice to select END OUTPUT function on scan tester. Press
"Q" to enter input. Turn ignition off. Disconnect scan tester.
READ MEASUREMENT & READ MEASURING (TEST) VALUE BLOCK
NOTE: See ENTERING SELF-DIAGNOSTICS for additional scan tester
operating instructions.
Corrado SLC (2.8L)
1) Connect Scan Tester (VAG 1551) to Data Link Connectors
(DLC) located in center console, in front of shift lever. With scan
tester in READ MEASURING VALUE BLOCK function, press "01" to "06"
buttons to select desired display group. See appropriate DISPLAY GROUP
table.
2) When display group is selected, only the second number is
shown on display (the zero does not appear on display). With READ
MEASUREMENT BLOCK function completed, select END OUTPUT function on
scan tester. Turn ignition off. Disconnect scan tester.
DISPLAY GROUP (CORRADO SLC)ÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄDisplay Group Number Display
& Channel Number Parameters
01
1 ..................................... Engine Speed
2 ....................... Engine Coolant Temperature
3 ............................. Oxygen Sensor Signal
4 .................................. Ignition Timing
02
1 ..................................... Engine Speed
2 ................................... Injection Time
3 ................................... System Voltage
4 .................. EGR Temperature (If Applicable)
03
1 ..................................... Engine Speed
2 ...................................... Engine Load
3 ................................... Throttle Angle
4 ............. Intake Air Temperature (At Manifold)
04
1 ..................................... Engine Speed
2 ...................................... Engine Load
3 .................................... Vehicle Speed
4 .............. Switch Positions (Operating Status)
05
1 ..................................... Engine Speed
2 ..................... Idle Air Control (IAC) Valve
3 ................................... IAC Duty Cycle
4 ............ Switch Positions (A/C & Auto. Trans.)
06
1 ............................. Oxygen Sensor Signal
2 ........... Oxygen Sensor Adaptive Learning (Idle)

MAINTENANCE REMINDER LIGHT RESET PROCEDURES
Article Text (p. 2)
1993 Volkswagen Corrado
For Volkswagen Technical Site: http://vw.belcom.ru
Copyright © 1998 Mitchell Repair Information Company, LLC
Wednesday, March 22, 2000 09:20PM
flash for approximately 3 seconds in odometer display window as
ignition is turned on. When servicing becomes due (every 7500 miles),
appropriate service code will flash for approximately 60 seconds. The
four service codes available for display are as follows:
* IN 00 (No Service Necessary)
* OEL (Oil Change Service) Every 7500 Miles
* IN 01 (Inspection Service) Every 15,000 Miles
* IN 02 (Additional Servicing Work) Every 30,000 Miles
2) After performing required maintenance, each effected
service code displayed must be reset individually. For example, at 15,
000 miles service codes OEL and IN 01 will both need to be reset.
3) To reset service codes, turn ignition on. Press and hold
odometer reset button located below speedometer. While holding button,
press clock reset button (lower button for digital clock) located to
left of fuel gauge. Release buttons. Programming mode is now
activated. Service code OEL1.S (distance counter) should be displayed.
4) Press clock reset button once more. 7500 miles should now
be indicated on display. Desired mileage for reset may be attained by
pressing clock reset button. Mileage displayed will decrease in
increments of 500 miles each time button is pressed. This feature
should only be used to calibrate mileage when instrument cluster is
replaced. When desired mileage is displayed, press odometer reset
button.
5) Service code OEL2.S (time counter) should be displayed.
Press clock reset button. 6 (months) will be indicated on display.
Time counter for next oil change may be set by pressing clock reset
button if instrument cluster was replaced. When desired time is
displayed, press odometer reset button.
6) Service code IN 01.S (time counter) should be displayed.
Press clock reset button. 12 (months) will be indicated on display.
Time counter for next maintenance interval may be set by pressing
clock reset button if instrument cluster was replaced. When desired
time is displayed, press odometer reset button.
7) Service code IN 02.S (distance counter) should be
displayed. Press clock reset button. 30,000 (miles) will be indicated
on display. Desired mileage for reset may be attained by pressing
clock reset button. Mileage displayed will decrease in increments of
500 miles each time button is pressed. This feature should only be
used to calibrate mileage when instrument cluster is replaced. When
desired mileage is displayed, turn ignition off. Programming is now
stored in memory.
END OF ARTICLE