1993 VOLKSWAGEN CORRADO Repair Manual

ANTI-LOCK BRAKE SYSTEM
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 08:57PM
connector terminals No. 9 and 10. See Fig. 2. If there is continuity,
switch is okay. If continuity does not exist, check wiring. If wiring
is okay, replace switch, and retest.
Right Rear Wheel Speed Sensor Resistance Test
Turn ignition off. Using an ohmmeter, measure resistance
between ECU connector terminals No. 4 and 22. See Fig. 2. If
resistance is 800-1400 ohms, go to next test. If resistance is not as
specified, check resistance at right rear wheel speed sensor. If
resistance is correct, repair wiring and retest. If resistance is not
correct, replace wheel speed sensor and retest.
Left Rear Wheel Speed Sensor Resistance Test
Using an ohmmeter, measure resistance between ECU connector
terminals No. 6 and 24. See Fig. 2. If resistance is 800-1400 ohms, go
to next test. If resistance is not as specified, check resistance at
left rear wheel speed sensor. If resistance is correct, repair wiring
and retest. If resistance is not correct, replace wheel speed sensor,
and retest.
Right Front Wheel Speed Sensor Resistance Test
Using an ohmmeter, measure resistance between ECU connector
terminals No. 7 and 25. See Fig. 2. If resistance is 800-1400 ohms, go
to next test. If resistance is not as specified, check resistance at
right front wheel speed sensor. If resistance is correct, repair
wiring and retest. If resistance is not correct, replace wheel speed
sensor and retest.
Left Front Wheel Speed Sensor Resistance Test
Using an ohmmeter, measure resistance between ECU connector
terminals No. 5 and 23. See Fig. 2. If resistance is 800-1400 ohms, go
to next test. If resistance is not as specified, check resistance at
left front wheel speed sensor. If resistance is correct, repair
wiring, and retest. If resistance is not correct, replace wheel speed
sensor, and retest.
Right Rear Wheel Speed Sensor Shielding Resistance Test
Using an ohmmeter, measure resistance between ECU connector
terminals No. 1 and 4. See Fig. 2. If resistance is 20,000 ohms or
more, go to next test. If resistance is less than 20,000 ohms, check
shielding wire for damage. Replace harness if damage is found and
retest.
Left Rear Wheel Speed Sensor Shielding Resistance Test
Using an ohmmeter, measure resistance between ECU connector
terminals No. 1 and 6. See Fig. 2. If resistance is 20,000 ohms or
more, go to next test. If resistance is less than 20,000 ohms, check
shielding wire for damage. Replace harness if damage is found and
retest.
Right Front Wheel Speed Sensor Shielding Resistance Test
Using an ohmmeter, measure resistance between ECU connector

ANTI-LOCK BRAKE SYSTEM
Article Text (p. 8)
1993 Volkswagen Corrado
For Volkswagen Technical Site: http://vw.belcom.ru
Copyright © 1998 Mitchell Repair Information Company, LLC
Wednesday, March 22, 2000 08:57PM
terminals No. 1 and 7. See Fig. 2. If resistance is 20,000 ohms or
more, go to next test. If resistance is less than 20,000 ohms, check
shielding wire for damage. Replace harness if damaged, and retest.
Left Front Wheel Speed Sensor Shielding Resistance Test
Using an ohmmeter, measure resistance between ECU connector
terminals No. 1 and 5. See Fig. 2. If resistance is 20,000 ohms or
more, go to next test. If resistance is less than 20,000 ohms, check
shielding wire for damage. Replace harness if damaged, and retest.
ECU Relay Resistance Test
Using an ohmmeter, measure resistance between ECU connector
terminals No. 1 and 8. See Fig. 2. If resistance is 50-100 ohms, go to
next test. If resistance is not as specified, check wiring. If wiring
is faulty, repair and retest. If wiring is okay, replace relay and
retest. See Fig. 3.Fig. 3: Locating Relays
Courtesy of Volkswagen United States, Inc.
ABS Main Valve Resistance Test
Using an ohmmeter, measure resistance between terminals at
ABS main valve terminals. See Figs. 1 and 4. If resistance is 2-5
ohms, ABS main valve is okay. If resistance is not 2-5 ohms, replace
hydraulic modulator.

ANTI-LOCK BRAKE SYSTEM
Article Text (p. 9)
1993 Volkswagen Corrado
For Volkswagen Technical Site: http://vw.belcom.ru
Copyright © 1998 Mitchell Repair Information Company, LLC
Wednesday, March 22, 2000 08:57PM
ABS Main Valve Continuity Test
Using an ohmmeter, check for continuity between ABS main
valve terminal No. 1 (Black wire) and ECU connector terminal No. 18,
and between ABS main valve terminal No. 2 (Brown wire) and ground.
There should be continuity at both test points. If there is no
continuity at both test points, repair wiring and retest.
Rear Hydraulic Modulator Inlet Valve Resistance Test
Using an ohmmeter, measure resistance between ECU connector
terminals No. 11 and 17. See Fig. 2. If resistance is 5-7 ohms, go to
next test. If resistance is not 5-7 ohms, measure between hydraulic
modulator block terminals No. 1 (Brown wire) and No. 5 (Gray wire).
See Fig. 4. If resistance is 5-7 ohms, check wiring between hydraulic
modulator and ECU for open circuit. If resistance is not 5-7 ohms,
replace hydraulic modulator.
Right Front Hydraulic Modulator Inlet Valve Resistance Test
Using an ohmmeter, measure resistance between ECU connector
terminals No. 11 and 15. See Fig. 2. If resistance is 5-7 ohms, go to
next test. If resistance is not 5-7 ohms, measure between hydraulic
modulator terminals No. 1 (Brown wire) and No. 2 (Yellow wire). See
Fig. 4. If resistance is 5-7 ohms, check wiring between hydraulic
modulator and ECU for open circuit. If resistance is not 5-7 ohms,
replace hydraulic modulator.
Left Front Hydraulic Modulator Inlet Valve Resistance Test
Using an ohmmeter, measure resistance between ECU connector
terminals No. 11 and 35. See Fig. 2. If resistance is 5-7 ohms, go to
next test. If resistance is not 5-7 ohms, measure between hydraulic
modulator terminals No. 1 (Brown wire) and No. 7 (Blue or Black/Green
wire). See Fig. 4. If resistance is 5-7 ohms, check wiring between
valve block and ECU for open circuit. If resistance is not 5-7 ohms,
replace hydraulic modulator.
Rear Hydraulic Modulator Outlet Valve Resistance Test
Using an ohmmeter, measure resistance between ECU connector
terminals No. 11 and 33. See Fig. 2. If resistance is 3-5 ohms, go to
next test. If resistance is not 3-5 ohms, measure between valve block
terminals No. 1 (Brown wire) and No. 4 (White wire). See Fig. 4. If
resistance is 3-5 ohms, check wiring between hydraulic modulator and
ECU for open circuit. If resistance is not 3-5 ohms, replace hydraulic
modulator.
Right Hydraulic Modulator Block Outlet Valve Resistance Test
Using an ohmmeter, measure resistance between ECU connector
terminals No. 11 and 34. See Fig. 2. If resistance is 3-5 ohms, go to
next test. If resistance is not 3-5 ohms, measure between hydraulic
modulator terminals No. 1 (Brown wire) and No. 3 (Green wire). See
Fig. 4. If resistance is 3-5 ohms, check wiring between hydraulic
modulator and ECU for open circuit. If resistance is not 3-5 ohms,
replace hydraulic modulator.

ANTI-LOCK BRAKE SYSTEM
Article Text (p. 10)
1993 Volkswagen Corrado
For Volkswagen Technical Site: http://vw.belcom.ru
Copyright © 1998 Mitchell Repair Information Company, LLC
Wednesday, March 22, 2000 08:57PM
Left Front Hydraulic Modulator Outlet Valve Resistance Test
Using an ohmmeter, measure resistance between ECU connector
terminals No. 11 and 16. See Fig. 2. If resistance is 3-5 ohms, go to
next test. If resistance is not 3-5 ohms, measure between hydraulic
modulator terminals No. 1 (Brown wire) and No. 6 (Black/Blue wire).
See Fig. 4. If resistance is 3-5 ohms, check wiring between hydraulic
modulator and ECU for open circuit. If resistance is not 3-5 ohms,
replace hydraulic modulator.
Hydraulic Modulator/Pump Relay Resistance Test
Turn ignition off. Unplug pressure switch connector from
hydraulic modulator. Using an ohmmeter, measure resistance between ECU
connector terminals No. 2 and 14. See Fig. 2. If resistance is 50-100
ohms, go to next test. If resistance is not 50-100 ohms, check wiring.
If wiring is faulty, repair wiring and retest. If wiring is okay,
replace relay and retest.
ABS Main Valve Function Test
Connect a jumper wire between ECU connector terminals No. 2
and 18. See Fig. 2. Depress brake pedal. Turn ignition on. Brake pedal
should rise slightly. If brake pedal did not rise slightly, check
wiring between terminals and hydraulic modulator. If wiring is okay,
replace hydraulic modulator.
Hydraulic Modulator/Pump Test
Turn ignition off. Depress brake pedal 25 times. Turn
ignition on. BRAKE and ANTILOCK lights should come on for 2-60
seconds. Pump should operate for 2-60 seconds, then turn off. If
lights do not come on, check wiring and warning light bulbs, and
retest. Also check bulb(s). If lights come on, then turn off, and pump
operates for 60 seconds maximum, then turns off, go to next test. If
pump does not operate and all other preceding tests have been
performed, replace hydraulic modulator/pump.
CAUTION: During VALVE BLOCK FUNCTION TESTS, DO NOT turn ignition on
longer than 60 seconds during any test.
Rear Valve Block Function Test
Connect a jumper wire ECU between ECU connector terminals No.
2, 17 and 33. See Fig. 2. Depress brake pedal. Rear wheels should be
locked up. Turn ignition on. Rear wheels should rotate. If wheels do
not rotate, replace hydraulic modulator. Turn ignition off.
Right Front Valve Block Function Test
Connect a jumper wire ECU between ECU connector terminals No.
2, 15 and 34. See Fig. 2. Depress brake pedal. Right front wheel
should be locked up. Turn ignition on. Right front wheel should
rotate. If wheel does not rotate, replace hydraulic modulator. Turn
ignition off.
Left Front Valve Block Function Test

ANTI-LOCK BRAKE SYSTEM
Article Text (p. 11)
1993 Volkswagen Corrado
For Volkswagen Technical Site: http://vw.belcom.ru
Copyright © 1998 Mitchell Repair Information Company, LLC
Wednesday, March 22, 2000 08:57PM
Connect a jumper wire ECU between ECU connector terminals No.
2, 16 and 35. See Fig. 2. Depress brake pedal. Left front wheel should
be locked up. Turn ignition on. Left front wheel should rotate. If
wheel does not rotate, replace hydraulic modulator. Turn ignition off.
REMOVAL & INSTALLATION
HYDRAULIC MODULATOR/PUMP
Removal & Installation
1) Depressurize brake system. See DEPRESSURIZING BRAKE
SYSTEM. Disconnect negative battery cable. Unplug all electrical
connectors from hydraulic modulator/pump. Identify and disconnect all
hydraulic lines from hydraulic modulator/pump. Plug all line openings.
2) From inside passenger compartment, remove push rod clevis
pin. Remove hydraulic modulator/pump retaining nuts. Remove hydraulic
modulator/pump. To install, reverse removal procedure. Tighten all
fittings to specification. See TORQUE SPECIFICATIONS table. Bleed
brake system. See BLEEDING BRAKE SYSTEM.
WHEEL SPEED SENSORS
NOTE: To protect magnetic part of sensor, always leave new wheel
speed sensor in special packaging until ready for
installation.
Removal & Installation
Remove bolt retaining wheel speed sensor. Unplug connector.
Remove wheel speed sensor. To install, apply Lubricant (G-000-650) to
sensor. Install sensor, and tighten retaining bolt to 84 INCH lbs. (10
N.m).
TORQUE SPECIFICATIONS
TORQUE SPECIFICATIONS TABLEÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄApplications Ft. Lbs. (N.m)
Brake Lines-To-Hydraulic Modulator/Pump .................... 11 (15)
Hydraulic Modulator/Pump Retaining Nuts .................... 18 (25)
INCH Lbs. (N.m)
Wheel Sensor Retaining Bolt ................................ 89 (10)
ÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄ WIRING DIAGRAMS

ANTI-LOCK BRAKE SYSTEM
Article Text (p. 12)
1993 Volkswagen Corrado
For Volkswagen Technical Site: http://vw.belcom.ru
Copyright © 1998 Mitchell Repair Information Company, LLC
Wednesday, March 22, 2000 08:57PMFig. 4: ABS Wiring Diagram (Corrado SLC)
END OF ARTICLE

ANTI-THEFT SYSTEM
Article Text
1993 Volkswagen Corrado
For Volkswagen Technical Site: http://vw.belcom.ru
Copyright © 1998 Mitchell Repair Information Company, LLC
Wednesday, March 22, 2000 08:57PM
ARTICLE BEGINNING
1993 ACCESSORIES & EQUIPMENT
Volkswagen Anti-Theft
Volkswagen; Corrado SLC, Passat
DESCRIPTION & OPERATION
The anti-theft system monitors the radio, all doors, hood and
trunk lid position. When the anti-theft system is activated, The horn
and emergency flashers will be activated and the vehicle will not
start. The windows and sun roof (if equipped) are not monitored.
The anti-theft system has self-diagnostic capabilities that
monitor all components and wiring harness. If the system is
functioning correctly, the horn will sound briefly after front door is
locked with the key.
ANTI-THEFT CONTROL MODULE LOCATION TABLEÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄModel Location
Corrado SLC ...................... Behind Right Kick Panel
Passat ...................... Driver Side Fuse/Relay Panel
ÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄ TROUBLE SHOOTING
SYSTEM DOES NOT OPERATE
NOTE: Ensure battery is fully charged and all fuses are okay.
1) Ground Circuit Check
Obtain radio security code. Disconnect battery cable
terminals. Disconnect anti-theft control module 6-pin and 10-pin
wiring harness connector. See ANTI-THEFT CONTROL MODULE LOCATION
table. Connect ohmmeter negative lead to ground. Connect positive lead
to anti-theft control module 10-pin wiring harness connector terminal
No. "3" (Brown wire). If continuity is present, go to next step. If
continuity is not present, repair open circuit.
2) Power Circuit Check
Connect battery cable terminals. Connect voltmeter negative
lead to ground. Connect positive lead to anti-theft control module 6-
pin wiring harness connector terminal No. "3" (Red wire). Switch
positive lead to anti-theft control module 10-pin wiring harness
connector terminal No. "1" (Red wire). If 12 volts are present at both
terminals, go to next step. If 12 volts are not present, repair open
circuit.
3) Turn ignition on. Leave voltmeter negative lead connected
to ground. Connect positive lead to anti-theft control module 10-pin
wiring harness connector terminal No. "4" (Black wire for Corrado;

ANTI-THEFT SYSTEM
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 08:57PM
Black/Yellow wire for Passat). If 12 volts are present, go to next
step. If 12 volts are not present, repair open circuit.
4) Alarm Horn Check
Turn ignition off. Connect ohmmeter negative lead to ground.
Connect positive lead to anti-theft control module 6-pin wiring
harness connector terminal No. "4" (Black/Yellow wire). If continuity
is present, go to next step. If continuity is not present, repair open
circuit. If circuit is okay, replace alarm horn.
5) Door Lock Switch Check
Connect voltmeter negative lead to ground. Connect positive
lead to anti-theft control module 10-pin wiring harness connector
terminal No. "7" (Red/Yellow wire for Corrado; Yellow/Red for Passat).
Insert key in driver's door lock. Turn key to lock position and hold
momentarily. Voltmeter should register 12 volts. Repeat procedure for
passengers door. If voltage is correct for each door, go to next step.
If voltage is not correct, repair open circuit or replace switch.
6) Door Lock Switch Check
Connect voltmeter negative lead to ground. Connect positive
lead to anti-theft control module 10-pin wiring harness connector
terminal No. "6" (Red/Black wire). Insert key in driver's door lock.
Turn key to unlocked position and hold momentarily. Voltmeter should
register 12 volts. Repeat procedure for passengers door. If voltage is
correct for each door, go to next step. If voltage is not correct,
repair open circuit or replace switch.
7) Alarm Switch & Hood Check
Connect ohmmeter negative lead to ground. Disconnect negative
battery cable. Connect positive lead to the following anti-theft
control module connector terminals:
* 10-pin harness connector terminal No. "5" (Gray wire).
* 10-pin harness connector terminal No. "8" (Brown/Red wire).
* 10-pin harness connector terminal No. "9" (Brown/Green wire).
* 10-pin harness connector terminal No. 10 (Brown/White wire for
Corrado SLC; Brown/Green wire for Passat).
If continuity is present, check for circuit short to ground. If
circuit is okay, replace switch. If continuity is not present, go to
next step.
8) Indicator Light Check
Leave ohmmeter negative lead connected to ground. Connect
negative battery cable. Using multimeter set on 10 A DC scale, connect
positive lead to anti-theft control module 10-pin wiring harness
connector terminal No. "2". If indicator light comes on, replace anti-
theft control module. If indicator light does not come on, repair open
circuit in wiring harness.
ALARM SYSTEM WILL NOT SWITCH OFF
1) Ground Circuit Check
Ensure battery is fully charged. Obtain radio security code.
Disconnect battery cable terminals. Disconnect anti-theft control
module 6-pin and 10-pin wiring harness connector. See ANTI-THEFT
CONTROL MODULE LOCATION table. Reconnect battery cable terminals.
2) Connect voltmeter negative lead to ground. Connect