Page 485 of 920
ELECTRICAL COMPONENT LOCATOR
Article Text (p. 27)
1993 Volkswagen Corrado
For Volkswagen Technical Site: http://vw.belcom.ru
Copyright © 1998 Mitchell Repair Information Company, LLC
Wednesday, March 22, 2000 09:09PM
Heated Seat Temperature Sensor Under lower cushion of each
seat.Intake Air Temperature Sensor On rear of upper intake
manifold.
Page 486 of 920
ELECTRICAL COMPONENT LOCATOR
Article Text (p. 28)
1993 Volkswagen Corrado
For Volkswagen Technical Site: http://vw.belcom.ru
Copyright © 1998 Mitchell Repair Information Company, LLC
Wednesday, March 22, 2000 09:09PMKnock Sensors (2) On right front & left rear of
engine block.
Page 487 of 920
ELECTRICAL COMPONENT LOCATOR
Article Text (p. 29)
1993 Volkswagen Corrado
For Volkswagen Technical Site: http://vw.belcom.ru
Copyright © 1998 Mitchell Repair Information Company, LLC
Wednesday, March 22, 2000 09:09PMMass Airflow Sensor On fresh air intake hose,
near air cleaner.
Page 488 of 920
ELECTRICAL COMPONENT LOCATOR
Article Text (p. 30)
1993 Volkswagen Corrado
For Volkswagen Technical Site: http://vw.belcom.ru
Copyright © 1998 Mitchell Repair Information Company, LLC
Wednesday, March 22, 2000 09:09PMThrottle Position (TP) Sensor On throttle body assembly.
SOLENOIDS & SOLENOID VALVESÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄComponent Component Location
Page 489 of 920
ELECTRICAL COMPONENT LOCATOR
Article Text (p. 31)
1993 Volkswagen Corrado
For Volkswagen Technical Site: http://vw.belcom.ru
Copyright © 1998 Mitchell Repair Information Company, LLC
Wednesday, March 22, 2000 09:09PMÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄEGR Frequency Solenoid Valve Near EGR valve, on right rear
of engine.EVAP Solenoid In hose, near mass airflow
sensor.
Page 494 of 920
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
Page 495 of 920
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
Page 496 of 920
D - ADJUSTMENTS
Article Text (p. 3)
1993 Volkswagen Corrado
For Volkswagen Technical Site: http://vw.belcom.ru
Copyright © 1998 Mitchell Repair Information Company, LLC
Wednesday, March 22, 2000 08:59PM
range and without interruption.
3) Reading should be 5-19 at idle. Reading should be 94-100
at full throttle stop. If readings are correct, press right arrow
button. Press "0" and "6" to select ENDING OUTPUT function. Press "Q"
button to enter input. If readings are incorrect, check TP sensor
circuit or replace TP sensor as necessary.
END OF ARTICLE
