1993 VOLKSWAGEN CORRADO coolant

ELECTRICAL COMPONENT LOCATOR
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 09:09PMA/C Relays (2) On fuse/relay panel, behind
left side of dash.
Aux. Coolant Pump Control

ELECTRICAL COMPONENT LOCATOR
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 09:09PMCoolant Level Module Relay In fuse/relay panel, behind
left side of dash.
Cooling Fan Relay (2nd. Stage) Mounted on top left of
radiator fan shroud.

ELECTRICAL COMPONENT LOCATOR
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 09:09PMEmergency Flasher Relay On fuse/relay panel, behind
left side of dash.
Engine Coolant Level
Control Module Relay On fuse/relay block, behind
left side of dash.

ELECTRICAL COMPONENT LOCATOR
Article Text (p. 21)
1993 Volkswagen Corrado
For Volkswagen Technical Site: http://vw.belcom.ru
Copyright © 1998 Mitchell Repair Information Company, LLC
Wednesday, March 22, 2000 09:09PM
Auxiliary Electric Coolant Pump On rear of engine.
Blower Motor In bottom of lower air duct on
right side.Door Lock Bi-Pressure Pump Built-in with central locking
control unit.
Fuel Pump Mounted in fuel tank.
Washer Pump Motor Bottom of washer fluid
reservoir, on left inner
fender panel.
Windshield Wiper Motor On center of firewall.
SENDING UNITS & SENSORSÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄComponent Component Location
ÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄABS Wheel Speed Sensor Mounted near each wheel hub
assembly.
Auto. Shoulder Belt Lock

ELECTRICAL COMPONENT LOCATOR
Article Text (p. 22)
1993 Volkswagen Corrado
For Volkswagen Technical Site: http://vw.belcom.ru
Copyright © 1998 Mitchell Repair Information Company, LLC
Wednesday, March 22, 2000 09:09PM Motion Sensor Under left corner of rear
seat.
Coolant Temperature Sensors

ELECTRICAL COMPONENT LOCATOR
Article Text (p. 25)
1993 Volkswagen Corrado
For Volkswagen Technical Site: http://vw.belcom.ru
Copyright © 1998 Mitchell Repair Information Company, LLC
Wednesday, March 22, 2000 09:09PM Gauge (Yellow) On thermostat housing, on
left rear of engine.
EGR Temperature Sensor On base of EGR valve, on right
rear of engine.
Engine Coolant Level Sensor Inside coolant

E - THEORY/OPERATION
Article Text
1993 Volkswagen Corrado
For Volkswagen Technical Site: http://vw.belcom.ru
Copyright © 1998 Mitchell Repair Information Company, LLC
Wednesday, March 22, 2000 09:09PM
ARTICLE BEGINNING
1993 ENGINE PERFORMANCE
Volkswagen Theory & Operation - Motronic
Corrado SLC
INTRODUCTION
This article covers basic description and operation of engine
performance-related systems and components. Read this article before
diagnosing vehicles or systems with which you are not completely
familiar.
COMPUTERIZED ENGINE CONTROLS
ELECTRONIC CONTROL UNIT
The Motronic engine management system uses a single
Electronic Control Module (ECM) for fuel injection, idle speed
control, ignition, and emission controls. The Electronic Control
Module (ECM) continually corrects air/fuel mixture based on signals
from various signals. The ECM is located underneath center of
windshield cowl, directly behind engine compartment firewall.
NOTE: Components are grouped into 2 categories. The first category
covers INPUT DEVICES, which control or produce voltage
signals monitored by the control unit. The second category
covers OUTPUT SIGNALS, which are components controlled by
the control unit.
INPUT DEVICES
Engine Coolant Temperature (ECT) Sensor
Sensor is located on thermostat housing. As engine coolant
temperature increases, the resistance of the sensor decreases. Engine
coolant temperature sensor signals are used for control of ignition
timing, injector pulse width, and idle speed stabilization. In
addition, knock sensors, idle speed control, oxygen sensor and fuel
tank venting are activated based on coolant temperature.
Engine Speed (RPM)/Reference Sensor
Engine speed (RPM) and crankshaft position are registered by
a single sensor located on side of engine block. The sensor reads a
toothed wheel mounted on the crankshaft. The wheel has a 2-tooth gap
which is used as a reference point for crankshaft position. The engine
speed/reference signal is used to monitor engine RPM and to identify
TDC position of cylinder No. 1.
Hall Effect Sensor
See ELECTRONIC IGNITION SYSTEM under IGNITION SYSTEM in this

E - THEORY/OPERATION
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 09:09PM
NOTE: Corrado SLC models are equipped with a Distributorless
Ignition System (DIS).
ELECTRONIC IGNITION SYSTEM
The electronic ignition system consists of ECM, power output
stage, ignition coil, distributor, mass airflow sensor, throttle valve
potentiometer, engine coolant temperature sensor, and Hall Effect
sensor.
Ignition system uses engine speed, engine load, and throttle
valve potentiometer signals to calculate ignition timing. Engine
coolant temperature signal is used to correct ignition timing when
engine is cold and to activate knock sensor circuit. See KNOCK
SENSOR(S) under IGNITION TIMING CONTROL in this article.
Hall Effect Sensor
On Corrado SLC, this sensor is mounted on end of camshaft
(near ignition coil). Sensor consists of a magnetic enclosure and
integrated semi-conductor circuit. A voltage signal is generated when
trigger wheel, turning at camshaft speed, interrupts magnetic field
created by the semi-conductor. Hall Effect sensor and engine
speed/reference signals are used to identify TDC position of cylinder
No. 1 for sequential fuel injection and spark knock regulation.
DISTRIBUTORLESS IGNITION SYSTEM (DIS)
Hall Effect Sensor
See HALL EFFECT SENSOR under ELECTRONIC IGNITION SYSTEM in
this article.
Ignition Coil & Output Stage
The distributorless (direct) ignition system consists of ECM,
power output stage, 3 double-ended ignition coils and secondary
ignition wires. The ECM operates each ignition coil through the power
output stage. The power output stage and heat sink are located behind
ignition coils. The ignition coils are located on left side of
cylinder head. When the power output stage fires an ignition coil, a
spark is supplied to 2 spark plugs at one time. One spark plug fires
during the compression stroke, and the other spark plug fires during
the exhaust stroke (waste spark).
IGNITION TIMING CONTROL
Knock Sensor(s)
The knock sensor(s) work(s) like a microphone to "listen" for
spark knock (detonation). When detonation occurs, ignition timing is
retarded until the knock is eliminated.
On Corrado SLC, 2 knock sensors are mounted on side of engine
block. Knock sensor I monitors cylinders No. 1, 3 and 5. Knock sensor
II monitors cylinders No. 2, 4 and 6.