VOLKSWAGEN CORRADO 1990 Repair Manual

A/C-HEATER SYSTEM - MANUAL
Article Text (p. 14)
1990 Volkswagen Corrado
For Volkswagen Technical Site: http://vw.belcom.ru
Copyright © 1998 Mitchell Repair Information Company, LLC
Thursday, March 23, 2000 09:41PMFig. 11: Manual A/C-Heater System Wiring Diagram (Vanagon)
END OF ARTICLE

AA - USING THIS SECTION (GENERAL HELP INFORMATION)
Article Text
1990 Volkswagen Corrado
For Volkswagen Technical Site: http://vw.belcom.ru
Copyright © 1998 Mitchell Repair Information Company, LLC
Thursday, March 23, 2000 09:41PM
ARTICLE BEGINNING
ENGINE PERFORMANCE
How To Use This Section
INTRODUCTION
NOTE: Because there are so many possible combinations of
articles for the different manufacturers and models,
the new hyper-text capabilities built into this product
DO NOT apply to this article.
It is the purpose of this repair information system to help
professional automotive technicians maintain top vehicle performance
and correct driveability problems related to today's high tech
vehicles.
Because of the limited amount of space allowable for the this
product, our titles have been condensed to fit into the menus. An
alphabetical designation has been added to the front of each title to
allow the titles to be displayed in a way that reflects their
respective order of use. References to the titles in some of the
diagnostic flow charts sometimes will not correlate with the titles in
the this product menu. If not, refer to the MENU CROSS-REFERENCE table
below.
MENU CROSS-REFERENCE TABLEÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄTitle Associate Print (Book) Title:
A - ENGINE/VIN I D .................................... Introduction
B - EMISSION APPLICATION ..................... Emission Applications
C - TUNE-UP SPECS .............. Service & Adjustment Specifications
C - SPECIFICATIONS ............. Service & Adjustment Specifications
D - ADJUSTMENTS ............................. On-Vehicle Adjustments
E - THEORY/OPERATION ............................ Theory & Operation
F - BASIC TESTING ...................... Basic Diagnostic Procedures
G - TESTS W/ CODES ................................ Self-Diagnostics
H - TESTS W/O CODES .................... Trouble Shooting - No Codes
I - SYS/COMP TESTS ..................... Systems & Component Testing
J - PIN VOLTAGE CHARTS .......................... Pin Voltage Charts
K - SENSOR RANGE CHARTS .............. Sensor Operating Range Charts
L - WIRING DIAGRAMS ................................ Wiring Diagrams
M - VACUUM DIAGRAMS ................................ Vacuum Diagrams
N - REMOVE/INSTALL/OHAUL .......... Removal, Overhaul & Installation
ÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄ Because of this we recommend that you read the rest of these
INTRODUCTION paragraphs to better understand why the information is
presented in this new format.
The A - ENGINE/VIN I D article will help you identify the
vehicle and its systems. It will also explain the VIN code and in many
cases, show its location.

AA - USING THIS SECTION (GENERAL HELP INFORMATION)
Article Text (p. 2)
1990 Volkswagen Corrado
For Volkswagen Technical Site: http://vw.belcom.ru
Copyright © 1998 Mitchell Repair Information Company, LLC
Thursday, March 23, 2000 09:41PM
If you want "TUNE-UP" type information, see D - ADJUSTMENTS
for the adjustment procedures. If you are familiar with the
procedures, but need a quick way to find the specification, go to C -
TUNE-UP SPECS or C - SPECIFICATIONS for the specifications pertaining
to the vehicle.
When diagnosing driveability problems, first go to F - BASIC
TESTING. This article is here to help eliminate wasted diagnostic
time. If the basic systems are working properly, go to G - TESTS W/
CODES.
If the vehicle still is having a driveability problem or if
the vehicle has no self-diagnostic system, go to H - TESTS W/O CODES.
This article will help you diagnose the problem by symptom, locate the
symptom exhibited by the vehicle, and inspect or test the items which
may be causing the problem.
After finding which specific system or component requires
testing, use the I - SYS/COMP TESTS article to tests the systems and
components. We have also included (when available) pin voltage charts
and sensor range charts. These can be found in J - PIN VOLTAGE CHARTS
and K - SENSOR RANGE CHARTS.
Also included in this section are wiring diagrams and vacuum
diagrams. These can be found in L - WIRING DIAGRAMS and M - VACUUM
DIAGRAMS.
When all diagnostic tests have been performed and the problem
has been discovered, it may be necessary to replace or overhaul the
defective part. This information can be found in
N - REMOVE/INSTALL/OHAUL.
The content of each of these articles is outlined below. As a
summary of the driveability diagnosis, see ROUTINE OUTLINE in this
article.
A - ENGINE/VIN ID
This article shows how to identify the model and engine by
its Vehicle Identification Number (VIN). A model coverage chart shows
each model and engine, the fuel system, ignition system and engine
code. The engine serial number locations are also included in this
article.
B - EMISSION APPLICATION
These charts identify the emission systems and sub-systems
applicable to each model and engine combination.
C - TUNE-UP SPECS
This is a collection of quick-reference type specifications.
This article is helpful when you are familiar with proper adjustment
procedures and only need specifications. Included in this section are:
* Battery specifications.
* Fluid capacities.

AA - USING THIS SECTION (GENERAL HELP INFORMATION)
Article Text (p. 3)
1990 Volkswagen Corrado
For Volkswagen Technical Site: http://vw.belcom.ru
Copyright © 1998 Mitchell Repair Information Company, LLC
Thursday, March 23, 2000 09:41PM
* Replacement intervals.
* Belt adjustment.
* Engine Compression.
* Valve clearance.
* Valve Arrangement.
* Ignition coil specifications.
* High tension wire resistance.
* Spark plug type and gap.
* Firing order.
* Ignition timing.
* Fuel pump performance and injector resistance specifications
* Slow and fast idle speed and mixture specifications.
* Carbon monoxide (CO) level specifications.
* Throttle position sensor/switch specifications.
C - SPECIFICATIONS
This is a collection of quick-reference type specifications.
This article is helpful when you are familiar with proper adjustment
procedures and only need specifications. Included in this section are:
* Battery specifications.
* Fluid capacities.
* Replacement intervals.
* Belt adjustment.
* Engine Compression.
* Valve clearance.
* Valve Arrangement.
* Ignition coil specifications.
* High tension wire resistance.
* Spark plug type and gap.
* Firing order.
* Ignition timing.
* Fuel pump performance and injector resistance specifications
* Slow and fast idle speed and mixture specifications.
* Carbon monoxide (CO) level specifications.
* Throttle position sensor/switch specifications.
D - ADJUSTMENTS
This article contains the information that use to be included
in the TUNE-UP section. Checking and adjusting valves, spark plugs,
spark plug wires, base ignition timing and idle speed are found in
this section. Use this article for routine maintenance. Also, if you
have a driveability problem, ensure all on-vehicle adjustments are
correct before proceeding with any diagnosis.
E - THEORY/OPERATION

AA - USING THIS SECTION (GENERAL HELP INFORMATION)
Article Text (p. 4)
1990 Volkswagen Corrado
For Volkswagen Technical Site: http://vw.belcom.ru
Copyright © 1998 Mitchell Repair Information Company, LLC
Thursday, March 23, 2000 09:41PM
This article covers basic theory and operation of engine
performance-related systems and components. Before diagnosing vehicles
or systems with which you are not completely familiar, read this
article.
F - BASIC TESTING
When diagnosing driveability problems, there are certain
"BASIC DIAGNOSTIC PROCEDURES" which must FIRST be performed. It is
necessary to perform a careful, complete check of basic engine
mechanical and electrical conditions, and verify spark availability
and adequate fuel supply.
The procedures apply to both computerized and non-
computerized systems. If all systems are okay, go to G - TESTS W/
CODES for vehicles with self-diagnostic systems or H - TESTS W/O CODES
for diagnosis by symptom.
G - TESTS W/ CODES
Use this article to retrieve and interpret trouble codes from
the engine computer self-diagnostic system. Once information is
retrieved, diagnostic procedures are given to help pinpoint and repair
computer system/component faults. Necessary steps for clearing trouble
codes are also given. If faults indicated by trouble codes are not
present at time of testing, proceed to TESTS W/O CODES for
intermittent testing procedures.
H - TESTS W/O CODES
This article helps trouble shoot driveability problems based
upon available "SYMPTOMS" and "INTERMITTENT TESTING" procedures.
Procedures in this section should lead you to specific component or
system tests which may or may not be computer monitored/controlled.
I - SYS/COMP TESTS
In this article, you will find tests for systems and
components related to air induction systems (turbochargers), fuel
control, ignition control, and emissions control systems.
J - PIN VOLTAGE CHARTS
PIN VOLTAGE CHARTS are supplied (where available) to speed up
the diagnostic process. By checking pin voltages at the electronic
control unit, it is possible to determine if the control unit is
receiving and transmitting proper voltage signals.
K - SENSOR RANGE CHARTS
Use the SENSOR OPERATING RANGE CHARTS to determine if a

AA - USING THIS SECTION (GENERAL HELP INFORMATION)
Article Text (p. 5)
1990 Volkswagen Corrado
For Volkswagen Technical Site: http://vw.belcom.ru
Copyright © 1998 Mitchell Repair Information Company, LLC
Thursday, March 23, 2000 09:41PM
sensor is out of calibration. A sensor that is out of calibration may
not set a trouble code, but it will cause driveability problems.
L - WIRING DIAGRAMS
Use these WIRING DIAGRAMS to identify and trace component
circuits, locate shorts and opens in circuits, and understand how
individual circuits function as part of a system. The diagrams in this
article are only for fuel, ignition and emission systems
M - VACUUM DIAGRAMS
The VACUUM DIAGRAMS will assist you in finding incorrectly
routed vacuum hoses which may cause driveability problems or computer
indicated malfunctions.
N - REMOVE/INSTALL/OHAUL
N - REMOVE/INSTALL/OHAUL contains information found in the
sub-headings of REMOVAL, OVERHAUL & INSTALLATION. These are procedures
and specifications required to remove, overhaul (if possible) and
install components related to engine performance.
WHERE TO START
PERFORM BASIC INSPECTION
1) Verify customer complaint.
2) Perform visual inspection. See F - BASIC TESTING.
3) Test engine sub-system to determine that the following
systems are functioning properly. See F- BASIC TESTING.
* Mechanical conditions (compression)
* Ignition output
* Fuel Delivery
4) Check air induction system for leaks.
5) Check & adjust basic engine settings listed below to
ensure they are to specification. See D - ADJUSTMENTS.
* Ignition timing
* Idle speed
CHECK FOR TROUBLE CODES
1) If equipped with self-diagnostics, check for trouble
codes. Refer to G - TESTS W/ CODES.
2) Repair causes of trouble code(s).
3) Clear control unit memory.
SYMPTOM DIAGNOSIS

AA - USING THIS SECTION (GENERAL HELP INFORMATION)
Article Text (p. 6)
1990 Volkswagen Corrado
For Volkswagen Technical Site: http://vw.belcom.ru
Copyright © 1998 Mitchell Repair Information Company, LLC
Thursday, March 23, 2000 09:41PM
1) If no self-diagnostics available, or no trouble codes
present, identify symptom.
2) See trouble shooting procedure to repair complaint. See H
- TESTS W/O CODES
TEST SYSTEM
1) Perform necessary systems and component tests. See I -
SYS/COMP TESTS.
2) Verify that complaint is repaired.
SAFETY PRECAUTIONS
* Always refer to Engine Tune-Up Decal in engine compartment before
performing tune-up. If manual and decal differ, always use decal
specifications.
* DO NOT allow or create a condition of misfire in more than one
cylinder for an extended period of time. Damage to converter may
occur due to loading converter with unburned air/fuel mixture.
* Always turn ignition off and disconnect negative battery cable
BEFORE disconnecting or connecting computer or other electrical
components.
* DO NOT drop or shock electrical components such as computer,
airflow meter, etc.
* DO NOT use fuel system cleaning compounds that are not
recommended by the manufacturer. Damage to gaskets, diaphragm
materials and catalytic converter may result.
* Before performing a compression test or cranking engine using a
remote starter switch, disconnect coil wire from distributor and
secure it to a good engine ground, or disable ignition.
* Before disconnecting any fuel system component, ensure fuel
system pressure is released.
* Use a shop towel to absorb any spilled fuel to prevent fire.
* DO NOT create sparks or have an open flame near battery.
* If any EFI components such as hoses or clamps are replaces,
ensure they are replaced with components designed for EFI use.
* Always reassemble throttle body components with new gaskets, "O"
rings and seals.
* If equipped with an inertia switch, DO NOT reset switch until
fuel system has been inspected for leaks.
* Wear safety goggles when drilling or grinding.
* Wear proper clothing which protects against chemicals and other
hazards.
END OF ARTICLE

ABBREVIATIONS
Article Text
1990 Volkswagen Corrado
For Volkswagen Technical Site: http://vw.belcom.ru
Copyright © 1998 Mitchell Repair Information Company, LLC
Thursday, March 23, 2000 09:42PM
ARTICLE BEGINNING
GENERAL INFORMATION
COMMONLY USED ABBREVIATION
"A" ABBREVIATION TABLE
"A" ABBREVIATION TABLEÚÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÂÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄ¿
³ABBREVIATION
³DEFINITION ³
ÃÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÅÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄ´
³A
³Amperes ³
³A/C
³Air Conditioning ³
³A/T
³Automatic Transmission/Transaxle ³
³AAP
³Auxiliary Accelerator Pump ³
³AB
³Air Bleed ³
³ABCV
³Air Bleed Control Valve ³
³ABDC
³After Bottom Dead Center ³
³ABRS
³Air Bag Restraint System ³
³ABS
³Anti-Lock Brake System ³
³AC
³Alternating Current ³
³ACC
³A/C Clutch Compressor ³
³ACCS
³A/C Cycling Switch ³
³ACCUM
³Accumulator ³
³ACCY
³Accessory ³
³ACT
³Air Charge Temperature Sensor ³
³ACV
³Thermactor Air Control Valve ³
³ADJ
³Adjust or Adjustable ³
³ADV
³Advance ³
³AFS
³Airflow Sensor ³
³AI
³Air Injection ³
³AIR or A.I.R.
³Air Injection Reactor ³
³AIS
³Air Injection System ³
³ALCL
³Assembly Line Communications Link ³
³ALDL
³Assembly Line Diagnostic Link ³
³ARC
³Automatic Ride Control ³
³ASCS
³Air Suction Control Solenoid ³
³ASD
³Auto Shutdown ³
³ASDM
³Air Bag System Diagnostic Module ³
³ASV
³Air Suction Valve ³
³ATC
³Automatic Temperature Control ³
³ATDC
³After Top Dead Center ³
³ATF
³Automatic Transmission Fluid ³
³ATS
³Air Temperature Sensor ³
³AXOD
³Automatic Transaxle Overdrive ³
³Abs.
³Absolute ³
³Accy.
³Accessory ³
³Alt.
³Alternator or Altitude ³
³Amp.
³Ampere ³
³Assy.
³Assembly ³

ABBREVIATIONS
Article Text (p. 2)
1990 Volkswagen Corrado
For Volkswagen Technical Site: http://vw.belcom.ru
Copyright © 1998 Mitchell Repair Information Company, LLC
Thursday, March 23, 2000 09:42PM³Auto. ³Automatic ³
³Aux.
³Auxiliary ³
³Avg.
³Average ³
ÀÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÁÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÙ "B" ABBREVIATION TABLE
"B" ABBREVIATION TABLE
ÚÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÂÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄ¿
³ABBREVIATION
³DEFINITION ³
ÃÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÅÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄ´
³B/P
³Backpressure ³
³BAC
³By-Pass Air Control ³
³BAP
³Barometric Absolute Pressure Sensor ³
³BARO
³Barometric ³
³BBDC
³Before Bottom Dead Center ³
³BCM
³Body Control Module ³
³BDC
³Bottom Dead Center ³
³BHP
³Brake Horsepower ³
³BLK
³Black ³
³BLU
³Blue ³
³BMAP
³Barometric & Manifold Absolute Pressure Sensor ³
³BOO
³Brake On-Off Switch ³
³BP
³Barometric Pressure sensor ³
³BPS
³Barometric Pressure Sensor ³
³BPT
³Backpressure Transducer ³
³BRN
³Brown ³
³BTDC
³Before Top Dead Center ³
³BTU
³British Thermal Unit ³
³BVSV
³Bimetallic Vacuum Switching Valve ³
³Baro.
³Barometric ³
³Batt.
³Battery ³
³Bbl.
³Barrel (Example: 4-Bbl.) ³
³Blst.
³Ballast ³
³Blwr.
³Blower ³
³Brkr.
³Breaker ³
ÀÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÁÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÙ "C" ABBREVIATION TABLE
"C" ABBREVIATION TABLE
ÚÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÂÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄ¿
³ABBREVIATION
³DEFINITION ³
ÃÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÅÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄ´
³ø C
³Celsius (Degrees) ³
³C(3) I
³Computer Controlled Coil Ignition ³
³C(4)
³Computer Controlled Catalytic Converter ³
³CANP
³Canister Purge solenoid ³
³CARB
³California Air Resources Board ³
³CAT
³Catalytic Converter ³
³CB
³Circuit Breaker ³
³CBD
³Closed Bowl Distributor ³

ABBREVIATIONS
Article Text (p. 3)
1990 Volkswagen Corrado
For Volkswagen Technical Site: http://vw.belcom.ru
Copyright © 1998 Mitchell Repair Information Company, LLC
Thursday, March 23, 2000 09:42PM³CBVV ³Carburetor Bowl Vent Valve ³
³cc
³Cubic Centimeter ³
³CCC
³Computer Command Control ³
³CCD
³Computer Controlled Dwell ³
³CCM
³Central Control Module ³
³CCO
³Converter Clutch Override ³
³CCOT
³Cycling Clutch Orifice Tube ³
³CCW
³Counterclockwise ³
³CDI
³Capacitor Discharge Ignition ³
³CEC
³Computerized Engine Control ³
³CFI
³Central Fuel Injection ³
³CID
³Cubic Inch Displacement ³
³CID
³Cylinder Identification sensor ³
³CIS
³Continuous Injection System ³
³CIS-E
³Continuous Injection System-Electronic ³
³CKT
³Circuit ³
³CLR
³Clear ³
³CNG
³Compressed Natural Gas ³
³CO
³Carbon Monoxide ³
³CO2
³Carbon Dioxide ³
³CONV
³Convertible ³
³CP
³Canister Purge ³
³CPA
³Connector Position Assurance ³
³CPS
³Crank Position Sensor ³
³CTS
³Coolant Temperature Sensor ³
³CV
³Check Valve or Constant Velocity ³
³CVC
³Constant Vacuum Control ³
³CW
³Clockwise ³
³CYL or Cyl.
³Cylinder ³
³Calif.
³California ³
³Carb.
³Carburetor ³
³Chrg.
³Charging ³
³Circ.
³Circuit ³
³Cntrl.
³Control ³
³Comp.
³Compressor or Compartment ³
³Conn.
³Connector ³
³Cont.
³Continued ³
³Conv.
³Convertible or Converter ³
³Cu. In.
³Cubic Inch ³
³Cyl.
³Cylinder ³
ÀÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÁÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÙ "D" ABBREVIATION TABLE
"D" ABBREVIATION TABLE
ÚÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÂÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄ¿
³ABBREVIATION
³DEFINITION ³
ÃÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÅÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄ´
³"D"
³Drive ³
³DBC
³Dual Bed Catalyst ³
³DC
³Direct Current or Discharge ³
³DDD
³Dual Diaphragm Distributor ³