1990 VOLKSWAGEN CORRADO fuel type

A - ENGINE/VIN ID
Article Text
1990 Volkswagen Corrado
For Volkswagen Technical Site: http://vw.belcom.ru
Copyright © 1998 Mitchell Repair Information Company, LLC
Thursday, March 23, 2000 09:40PM
ARTICLE BEGINNING
1990 ENGINE PERFORMANCE
Introduction
Volkswagen; Cabriolet, Corrado, Fox, Golf GL/GTI,
Jetta, Vanagon
1990 MODEL COVERAGE TABLEÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄ BODY ENGINE FUEL IGNITION
MODEL CODE ENGINE ID SYSTEM SYSTEM
Cabriolet 15 1.8L JH (1) Hall Effect
Corrado 50 1.8L PG (1) Hall Effect
Fox 30 1.8L JN (2) Hall Effect
Golf GL/GTI 17 1.8L 8-Valve GX (1) Hall Effect
Jetta 16 1.8L 8-Valve GX (1) Hall Effect
Jetta GLi 17 2.0L 16-Valve 9A (3) Hall Effect
Vangon 25 2.1L MV (1) Hall Effect
(1) - AFC-Digifant.
(2) - CIS-E.
(3) - CIS-Motronic.
ÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄ VIN ID
(VIN) W V W C B 5 1 5 2 L C 0 0 0 0 0 1
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17
1, 2, 3 - Indicates Nation of Origin.
4 - Indicates Series.
5 - Indicates Engine Type.
6 - Indicates Restraint System.
7, 8 - Indicates Body Code.
9 - Indicates Check Digit.
10 - Indicates Model Year.
11 - Indicates Assembly Plant.
12 thru 17 - Vehicle Production Sequence.
MODEL YEAR VIN CODE APPLICATION
ÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄVIN Code Model Year
J ................................ 1988
K ................................ 1989
L ................................ 1990
ÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄ ENGINE CODE 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

COMPUTER RELEARN PROCEDURES
Article Text
1990 Volkswagen Corrado
For Volkswagen Technical Site: http://vw.belcom.ru
Copyright © 1998 Mitchell Repair Information Company, LLC
Thursday, March 23, 2000 09:43PM
ARTICLE BEGINNING
GENERAL INFORMATION
Computer Relearn Procedures
All Models
* PLEASE READ THIS FIRST *
The following general procedures are to be used if
driveability problems are encountered after power loss or battery has
been disconnected. These procedures may provide an aid in eliminating
these problems.
To reduce the possibility of complaints, after any service
which requires battery power to be disconnected, vehicle should be
road tested.
COMPUTER RELEARN PROCEDURES
Vehicles equipped with engine or transmission computers may
require a relearn procedure after vehicle battery is disconnected.
Many vehicle computers memorize and store vehicle operation patterns
for optimum driveability and performance. When vehicle battery is
disconnected, this memory is lost. The computer will use default data
until new data from each key start is stored. As computer memorizes
vehicle operation for each new key start, driveability is restored.
Vehicle computers may memorize vehicles operation patterns for 40 of
more key starts.
Customers often complain of driveability problems during
relearn stage because vehicle acts differently then before being
serviced. Depending on type and make of vehicle and how it is
equipped, the following complaints (driveability problems) may exist:
* Harsh Or Poor Shift Quality
* Rough Or Unstable Idle
* Hesitation Or Stumble
* Rich Or Lean Running
* Poor Fuel Mileage
These symptoms and complaints should disappear after a number
of drive cycles have been memorized. To reduce the possibility of
complaints, after any service which requires battery power to be
disconnected, vehicle should be road tested. If a specific relearn
procedure is not available, the following procedure may be used:
Automatic Transmission
* Set parking brake, start engine in "P" or "N" position.
Warm-up vehicle to normal operating temperature or until
cooling fan cycles.
* Allow vehicle to idle for one minute in "N" position. Select

D - ADJUSTMENTS
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 09:43PM
059" (1.5 mm) restrictor into hole in intake air boot. If vehicle is
not equipped with this type of connector, use Plug (026 133 382D) with
.059" (1.5 mm) orifice. Adjust idle speed if not within specification.
See IDLE SPEED & CO LEVEL table.
6) Connect fuel pressure gauge and ensure system fuel
pressure is correct. See FUEL SYSTEM in F - BASIC TESTING article.
Connect an inductive tachometer or Tester (VW 1367) and Test Lead (VW
1473). See Fig. 2.Fig. 2: Tester (VW 1367) & Test Lead (VW 1473)
Courtesy of Volkswagen United States, Inc.
7) Remove CO probe receptacle cap and connect CO meter.
Ensure fit is snug to prevent exhaust leaks. Connect Digital
Multimeter (US 1119) with Adapter (VW 1315 A/1) to differential
pressure regulator. See Fig. 3.Fig. 3: Digital Multimeter Hook-Up
Courtesy of Volkswagen United States

E - THEORY/OPERATION - DIGIFANT
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 09:43PM
COOLANT TEMPERATURE SENSOR
Is a temperature sensitive variable resistor sensor (less
resistance as temperature increases). This sensor returns signals to
the ECU to determine amount of cold start enrichment, ignition timing
and idle stabilization during warm-up. The sensor return signal has
input to the ECU when the oxygen sensor, idle stabilization, and full
throttle enrichment functions are activated.
CO POTENTIOMETER (CORRADO)
The CO potentiometer adjusts CO mixture. Located on the
intake air duct before the throttle housing. The adjustment screw has
a tamper-proof plug. An air temperature sensor located within the
potentiometer housing is used to calculate air density.
ECU CONTROL RELAY
When energized by ignition switch, the ECU control relay
provides battery voltage to ECU.
FULL THROTTLE (FUEL) ENRICHMENT SWITCH
The full throttle enrichment switch supplies the control unit
with information to increase amount of fuel injected during full
throttle operation.
HALL EFFECT SENSOR
See ELECTRONIC IGNITION SYSTEM under IGNITION SYSTEM in this
article.
INTAKE AIR TEMPERATURE SENSOR
Intake air temperature sensor is a thermistor-type variable
resistor (resistance decreases with increase of temperature). This
sensor voltage signal varies to ECU in relation to engine air
temperature. Sensor is located inside the airflow meter.
KNOCK SENSOR(S)
Pick-up engine vibrations before knock occurs. The ECU
compensates timing as needed and controls timing advance or retard for
maximized engine performance.
MANIFOLD ABSOLUTE PRESSURE (MAP) SENSOR (CORRADO)
MAP is located inside the ECU. The MAP sensor signal is used
by ECU to determine engine load and manifold boost pressure. This
signal along with RPM and intake air temperature is used to calculate
fuel injection quantity.

EMISSION CONTROL VISUAL INSPECTION PROCEDURES
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 09:44PMFig. 3: Typical Thermostatic Air Cleaner System
FUEL EVAPORATIVE SYSTEM (EVAP)
The EVAP system allows for proper fuel system ventilation
while preventing fuel vapors from reaching the atmosphere. This means
that vapors must be caught and stored while the engine is off, which
is when most fuel evaporation occurs. When the engine is started,
these fuel vapors can be removed from storage and burned. In most
systems, storage is provided by an activated charcoal (or carbon)
canister. See Fig. 4. On a few early systems, charcoal canisters are
not used. Instead, fuel vapors are vented into the PCV system and
stored inside the crankcase.
The main components of a fuel evaporation system are a
sealed fuel tank, a liquid-vapor separator and vent lines to a vapor-
storing canister filled with activated charcoal. The filler cap is
normally not vented to the atmosphere, but is fitted with a valve to
allow both pressure and vacuum relief.
Although a few variations do exist between manufacturers,
basic operation is the same for all systems. Check for presence of
vapor storage canister or crankcase storage connections when required.
Ensure required hoses, solenoids, etc., are present and connected
properly. Check for proper type fuel tank cap. Check for any non-OEM
or auxiliary fuel tanks for compliance and the required number of
evaporation canisters.

EMISSION CONTROL VISUAL INSPECTION PROCEDURES
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 09:44PMFig. 4: Typical Fuel Evaporative System
CATALYTIC CONVERTERS
Oxidation Catalyst (OC)
This type of converter is the most common. It may use pellets
or monolith medium, depending upon application. See Fig. 5. Platinum
and palladium (or platinum alone) are used as catalyst in this type of
converter.
Visually check for presence of catalytic converter(s). Check
for external damage such as severe dents, removed or damaged heat
shields, etc. Also check for pellets or pieces of converter in the
tailpipe.Fig. 5: Typical Oxidation Catalytic Converter (Pellet Type) Shown;
Typical Three-Way Catalytic Converter Is Similar
Courtesy of General Motors Corp.
Three-Way Catalyst (TWC)
This type of converter is nearly identical to a conventional
converter with the exception of the catalyst. See Fig. 5. The TWC
converter uses rhodium, with or without platinum, as its catalyst.
Rhodium helps reduce NOx emissions, as well as HC and CO.