1990 VOLKSWAGEN CORRADO alternator belt

1.8L 4-CYL 8-VALVE & 1.8L 4-CYL 16-VALVE
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 09:40PM
NOTE: Match mark engine mounts to ensure original alignment is
achieved after installation. On vehicles with A/C and power
steering, remove components with hoses attached and secure
out of way.
ENGINE R & I (EXCEPT FOX)
REMOVAL (EXCEPT FOX)
1) Disconnect and remove battery. Open fuel tank fill cap and
radiator cap. Remove intake air duct. On 16-valve engines, remove
intake manifold assembly. On vehicles with A/C, remove trim panel and
lower apron. Remove condenser from crossmember and radiator. Remove
all duct work. Mark and disconnect A/C and cooling fan electrical
connectors. Remove accessory belts.
2) On Golf, GTI and Jetta models, leave A/C hoses attached
and remove A/C compressor. Pivot A/C condenser and compressor to side
of vehicle and secure.
3) On Cabriolet and Scirocco models, remove alternator and
timing belt cover. Remove 3 A/C bracket Allen head bolts behind timing
belt cover. Remove A/C bracket support brace. Remove A/C compressor
bracket bolts. Leave hoses attached and secure A/C compressor with
bracket out of way.
4) On all models, open heater controls. Remove cooling hose
from thermostat housing flange and drain coolant. Remove flange. Mark
and remove all cooling system hoses (as necessary).
5) On Golf, GTI and Jetta models, remove grille from radiator
support. Disconnect electrical connectors at radiator support. Remove
radiator-to-support bolts. Remove radiator support using care not
damage headlights. Remove radiator, fan and shroud assembly.
6) On all models, remove axle shafts from transaxle. See FWD
AXLE SHAFTS article in the DRIVE AXLES section. Mark and disconnect
shift linkage and speedometer cable. Mark and remove electrical
connectors and vacuum hoses (as necessary). Disconnect throttle,
cruise and kickdown cables (if equipped). Leave fuel lines connected
and remove cold start injector and warm-up regulator.
7) Remove fuel injectors and install protective caps and
plugs. Remove rear engine mount. Remove complete transaxle mount. On
Cabriolet models, remove right front tire assembly. Remove right and
left engine mount through bolts.
8) On all models, install engine sling on engine lift hooks.
Carefully raise engine and transaxle out of vehicle. Separate
transaxle from engine (if necessary).
INSTALLATION
1) To install, reverse removal procedure. Engine alignment
adjustment is necessary whenever engine is removed or mounts are
loosened. To adjust, loosen through bolt on engine mount "A". Loosen
transmission transaxle mount "B" bolts. Loosen front engine mount and
bracket. See Fig. 2.
2) Lightly rock engine and transaxle to allow position to

ALTERNATOR & REGULATOR - BOSCH
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
1989-92 ELECTRICAL
Alternators & Regulators - Bosch
Cabriolet, Fox, Golf, GTI, Jetta, Jetta GLI, Vanagon
1991 Corrado, Passat & Golf GL
NOTE: Some Golf, GTI, Jetta and Jetta GLI models may use a
Motorola alternator. Please refer to ALTERNATORS - SEV
MOTOROLA article. Vanagon models only use Bosch 90-amp
alternators.
DESCRIPTION
Bosch alternators are conventional 3-phase, self-rectifying
type alternators. Bosch 65 through 75-amp alternators use 3 positive
and 3 negative diodes connected to stator windings to rectify current.
Bosch 90-amp alternators use 14 diodes.
All alternators use 3 exciter diodes connected to stator
windings. These diodes turn off the alternator indicator light and
supply power to the voltage regulator while the engine is running.
Bosch regulators are transistorized and integral with alternator.
BELT TENSION ADJUSTMENT
BELT TENSION SPECIFICATIONSÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄApplication (1) Deflection In. (mm)
New Belt ................................... 5/64 (2)
Used Belt ................................. 13/64 (5)
(1) - Deflection is with 22 lbs. (10 kg) pressure
applied midway on longest belt run.
ÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄ TESTING (ON-VEHICLE)
WIRING CONTINUITY TEST
1) Connect a voltmeter between alternator "B+" terminal and
ground. Voltmeter should indicate battery voltage. If not, check
wiring between alternator and battery.
2) Turn ignition on and ensure alternator indicator light
comes on. If light does not come on, check wiring between alternator
and warning light, including indicator bulb.
OUTPUT TEST
1) Ensure connections at battery, alternator, and starter

ALTERNATOR & REGULATOR - BOSCH
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 09:42PM
(most vehicles) are clean and tight. Ensure alternator, engine and
body are properly grounded. Ensure alternator drive belt is tight and
in good condition.
2) Connect ammeter following manufacturer's instructions.
Connect voltmeter leads to battery terminals. Adjust carbon pile on
tester until voltmeter reads 13.5 volts. Alternator output should be
28-35 amps.
3) Repeat process at 1000 RPM. Alternator output should be
75-85 amps. Repeat test at 2000 RPM. Alternator output should be 89
amps. If alternator output is low, remove alternator for testing and
repairs.
4) Start engine and run at 3000 RPM. Adjust carbon pile on
tester to obtain maximum alternator output. Do not allow voltage to go
below 12.6 volts.
5) Alternator output should equal alternator rated output,
minus 16-20 amps. If reading is 16-20 amps below alternator rating,
replace regulator and retest. If output is still low, repair or
replace alternator.
REGULATOR CONTROL VOLTAGE TEST
1) Connect ammeter following manufacturer's instructions.
Connect voltmeter leads to battery terminals. Start engine and run at
3000 RPM.
2) Run engine until voltage stops rising. Voltage should be
13.5-14.5 volts. If reading is incorrect, remove regulator and ensure
brushes are longer than 7/32" (6 mm). Replace if necessary.
3) If brushes are okay and regulator fails to keep voltage
within specified limits, replace regulator and retest. If voltage is
still incorrect, repair or replace alternator.
BENCH TESTING
DIODE ASSEMBLY
1) Place ohmmeter on x 100 scale. Connect ohmmeter leads
across "B+" terminal and 3 stator terminals one at a time. Reverse
leads. Ohmmeter should indicate continuity in one direction only.
2) Connect ohmmeter leads across negative plate and 3 stator
terminals one at a time. See Fig. 1. Reverse leads. Ohmmeter should
indicate continuity in one direction only.
3) Connect ohmmeter leads across "D+" terminal and 3 stator
terminals one at a time. Reverse leads. Ohmmeter should indicate
continuity in one direction only. Replace diode assembly if defective.

C - SPECIFICATIONS
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 09:43PM
All Other Models .................................. 4.3 (4.1)
Man. Transaxle (SAE 80W-90/API GL-4)
Fox ............................................... 1.8 (1.7)
Vanagon ........................................... 3.2 (3.0)
All Other Models .................................. 2.1 (2.0)
(1) - Refill capacity.ÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄ BELT ADJUSTMENT TABLE
BELT ADJUSTMENT TABLE
ÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄApplication (1) Deflection In. (mm)
All Models (Except Vanagon)
Alternator
New ........................................... (2) 5/64 (2)
Old .............................................. 13/64 (5)
A/C Compressor
New ............................................... 3/8 (10)
Old ............................................... 3/8 (10)
Power Steering
New ............................................... 5/64 (2)
Old .............................................. 13/64 (5)
Vanagon
Alternator ................................. 3/8-9/16 (10-15)
A/C Compressor ..................................... 3/8 (10)
(1) - Deflection is with 22 lbs. (10 kg) pressure applied midway
on longest belt run.
(2) - Use 3/8" (10 mm) on models with A/C.
ÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄ REPLACEMENT INTERVALS TABLE
REPLACEMENT INTERVALS TABLE
ÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄComponent Interval (Miles)
Air Filter ............................................. 30,000
Coolant ................................................ 30,000
Fuel Filter (1) ........................................ 15,000
Oil & Filter ............................................. 7500
Spark Plugs ............................................ 30,000
(1) - Discard mini-fuel at 1000-mile maintenance interval.
Install new copper gaskets.
ÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄ

SERVICE INDICATOR & WARNING LIGHTS
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 09:51PM
started.
"BRAKE" INDICATOR LIGHT
Indicates the brake fluid level is low in the reservoir or
the parking brake is still on.
HIGH BEAM INDICATOR LIGHT
Light indicates that the head light high beam is on.
TURN SIGNAL INDICATOR LIGHTS
Indicate signal operation and direction.
SEAT BELT WARNING LIGHT
The warning light stays on until the driver's seat belt is
fastened.
ALTERNATOR WARNING LIGHT
Light comes on if alternator is not charging.
REAR WINDOW DEFOGGER INDICATOR
Indicates the rear defogger is on.
FOG LIGHTS INDICATOR
Indicates the fog lights are on.
EMERGENCY FLASHER INDICATOR
Indicates the emergency flashers are in operation.
"ECS" MALFUNCTION WARNING (IF EQUIPPED)
Warns of a malfunction in the emission control system.
OIL PRESSURE WARNING LIGHT
Indicates no, or low, oil pressure.
COOLANT TEMPERATURE & LEVEL WARNING (IF EQUIPPED)
Warns of excessive engine coolant temperature or low coolant
level in system.
"ABS" WARNING LIGHT
Warns of a malfunction in the anti-lock brake system.

STARTER - BOSCH
Article Text
1990 Volkswagen Corrado
For Volkswagen Technical Site: http://vw.belcom.ru
Copyright © 1998 Mitchell Repair Information Company, LLC
Thursday, March 23, 2000 09:51PM
ARTICLE BEGINNING
1990-92 ELECTRICAL
Starters - Bosch
1990-92 Passat
1991-92 Cabriolet, Corrado, Fox, Golf GL, GTI, Jetta, Vanagon
DESCRIPTION
Starter is a brush type, series-wound electric motor with an
overrunning clutch. Field frame is enclosed by commutator end frame
and drive bushing and carries pole shoes and field coils. A splined
armature shaft drive end carries drive assembly.
TROUBLE SHOOTING
CHARGING SYSTEM TROUBLE SHOOTING TABLEÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄPROBLEM
Possible Cause Action
ÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄNO START CONDITION
Dead Battery ............................ Check/Replace Battery
Bad Cable Connections .................... Clean/Replace Cables
Ignition Switch/Circuit Fault ............ Check Switch/Circuit
CHARGING SYSTEM WARNING LIGHT STAYS ON
Loose/Worn Alternator Belt ............... Tighten/Replace Belt
Loose Alternator Connections ......... Check/Repair Connections
Warning Light Wiring ...................... Check/Repair Wiring
Faulty Stator/Diodes ................... Test/Repair Alternator
Faulty Voltage Regulator ................ Test/Repair Regulator
WARNING LIGHT OFF WITH IGNITION SWITCH ON
Blown Fuse ................................. Check/Replace Fuse
Faulty Alternator ............................. Test Alternator
Bad Warning Light Bulb ...................... Test/Replace Bulb
WARNING LIGHT ON WITH IGNITION SWITCH OFF
Alternator Wiring Short ................... Check/Repair Wiring
Faulty Rectifier Bridge ................ Test/Repair Alternator
AMMETER INDICATES DISCHARGE
Loose/Worn Alternator Belt ............... Tighten/Replace Belt
Loose Alternator Connections ......... Check/Repair Connections

STEERING SYSTEM - POWER
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 09:51PM
3) If pump pressure is not within specification, replace
pump.
STEERING WHEEL TURNING FORCE
Except Vanagon
Remove steering gear. See POWER RACK & PINION under REMOVAL &
INSTALLATION. Loosen lock nut. Turn adjuster bolt until pinion shaft
can be turned by hand without binding. Hold adjuster bolt in position
while tightening lock nut.
Vanagon
If steering effort is too high, check steering shaft,
steering linkage, "U" joints, and ball joints for binding. If all are
okay, replace steering gear.
REMOVAL & INSTALLATION
POWER STEERING PUMP
Removal
Remove alternator and pump belts. Disconnect hydraulic lines
from pump. Cap lines to prevent contamination. Remove bracket bolts.
Remove pump. See Fig. 2.
Installation
To install, reverse removal procedure. Adjust belt tension.
See POWER STEERING PUMP BELT under ADJUSTMENTS. Tighten nuts and bolts
to specification. See TORQUE SPECIFICATIONS table at end of article.
Fill and bleed hydraulic system. See HYDRAULIC SYSTEM BLEEDING. Start
engine and check for leaks.Fig. 2: Identifying Typical Power Steering Pump Components
Courtesy of Volkswagen United States, Inc.
POWER RACK & PINION
NOTE: Refer to illustration for exploded view of power rack and

TROUBLE SHOOTING - BASIC PROCEDURES
Article Text (p. 8)
1990 Volkswagen Corrado
For Volkswagen Technical Site: http://vw.belcom.ru
Copyright © 1998 Mitchell Repair Information Company, LLC
Thursday, March 23, 2000 09:52PM
FUEL SYSTEMS
Carburetor idle or transfer Inspect system and
system plugged remove restriction
Frozen or binding heated air Inspect heated air
inlet door for bindingÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄHesitation With Defective accelerator pump Replace pump, see
Heavy Gas Pedal FUEL SYSTEMS
Movement
Metering rod carrier Remove restriction
sticking or binding
Large vacuum leak Inspect vacuum
system and repair
leak
Float level setting too Reset float level,
low see FUEL SYSTEMS
Defective fuel pump, lines Inspect pump, lines
or filter and filter
Air door setting incorrect Adjust air door
setting, see FUEL
ÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄ CHARGING SYSTEM TROUBLE SHOOTING
WARNING: This is GENERAL information. This article is not intended
to be specific to any unique situation or individual vehicle
configuration. The purpose of this Trouble Shooting
information is to provide a list of common causes to
problem symptoms. For model-specific Trouble Shooting,
refer to SUBJECT, DIAGNOSTIC, or TESTING articles available
in the section(s) you are accessing.
BASIC CHARGING SYSTEM TROUBLE SHOOTING CHART
ÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄCONDITION POSSIBLE CAUSE CORRECTION
ÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄVehicle Will Not Dead battery Check battery cells,
Start alternator belt
tension and alternator
output
Loose or corroded battery Check all charging
connections system connections
Ignition circuit or switch Check and replace as