Volkswagen Corrado (1993 year). Manual - part 143

 

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Volkswagen Corrado (1993 year). Manual - part 143

 

 

F - BASIC TESTING 

(1) - With vacuum hose disconnected from fuel pressure regulator.
(2) - Approximately 4.3-7.2 psi (0.3-0.5 kg/cm

ý

) below system

      pressure, with differential pressure regulator disconnected.
(3) - Approximately 18.5-23.0 psi (1.3-1.6 kg/cm

ý

) below system

      pressure, with differential pressure regulator connected.

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         IGNITION CHECKS

NOTE:    Ignition checks are divided according to fuel system.

         SPARK TEST

         1) Using an ohmmeter, check resistance of each spark plug
wire. See HIGH TENSION WIRE RESISTANCE table. Check for a strong Blue
spark at coil wire and at each spark plug wire by holding wire
terminal 5/16" from ground while cranking engine.
         2) Disconnect and inspect all related ignition system
connectors and harness. Clean or repair if necessary. If related
connectors and harness are okay, remove negative battery cable.
Disconnect secondary and primary leads from ignition coil.
         3) Using ohmmeter, check primary resistance between primary
terminals of coil. Check secondary resistance between coil secondary
terminal and primary positive terminal. Replace coil if readings are
not within specifications. See IGNITION COIL RESISTANCE table.

HIGH TENSION WIRE RESISTANCE TABLE

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Application                                        Ohms

Coil Wire Only  ..................................  (1)
Coil Wire With Connector  ..................  1600-2400
Spark Plug Wire Connector  .................  4000-6000
Suppressor (2)  .............................  600-1400

(1) - Check for continuity.
(2) - Suppressor is located between ignition coil wire
      and distributor cap.

ÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄ

         IGNITION COIL

IGNITION COIL RESISTANCE - Ohms @ 68

ø

F (20

ø

C)

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Application               Primary             Secondary

Cabriolet
 Digifant I  ...........  0.5-0.7  .........  3000-4000

F - BASIC TESTING 

(1) - Ignition coil pack, new for 1993, is located on
      left side of cylinder head. When ignition coil is
      triggered, spark is supplied to 2 spark plugs at
      one time. One spark plug fires during compression
      stroke and the other plug fires during exhaust
      stroke (waste spark). Ignition coil specifications
      are not available from manufacturer.

ÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄ

         DISTRIBUTOR

         Hall Effect Sender
         1) Remove coil secondary wire and attach to ground.
Disconnect Hall Effect sender harness connector at distributor. Using
an LED Test Light (US 1115), check for voltage between outer terminals
of connector. See Figs. 2 and 3. With ignition on, light should be on.
If light is on, go to next step. If light is not on, check wiring for
short or open circuit. If wiring is okay, replace ignition control
unit.
         2) Reconnect Hall Effect sender harness connector. Pull back
Hall Effect sender boot to expose contact terminals. Connect LED Test
Light (US 1115) probe to center contact and battery positive terminal.
See Fig. 2. Observe test light while cranking engine. If test light
blinks, Hall Effect sender is okay. If light does not blink, replace
Hall Effect sender.

Fig. 2:  Testing Hall Effect Sender (Typical)
Courtesy of Volkswagen United States, Inc.

         Voltage Supply & Ground To Hall Effect Sender

F - BASIC TESTING 

Fig. 3:  Testing Hall Effect Sender Connector (Typical)
Courtesy of Volkswagen United States, Inc.

         POWER STAGE

         Voltage Supply & Ground To Power Stage
         1) Turn ignition off. Disconnect coil power stage harness
connector. Connect a voltmeter to terminals No. 1 and No. 3. See
Fig. 4.
         2) Turn ignition on. Ensure battery voltage is present. Turn
ignition off. If voltage is not present, check for open wire from fuse
box to terminal No. 1, or open from terminal No. 3 to ground. Repair
open wire and recheck.

F - BASIC TESTING 

         HALL CONTROL UNIT

         Cabriolet, Fox, Golf, Jetta & GTI With Digifant II
         1) Perform spark test. See SPARK TEST under IGNITION CHECKS.
If secondary spark is present, ignition control unit is okay. If
secondary spark is not present, turn ignition off. Disconnect ignition
control unit wire harness connector. Turn ignition on. Using a
voltmeter, measure voltage between terminal No. 2 (-) and terminal No.
4 (+) of connector. See Fig. 5.
         2) Battery voltage should be present. If battery voltage is
not present, ensure continuity exists between terminal No. 2 and
ground. Continuity must also exist between terminal No. 4 and ignition
coil positive terminal. Repair wiring if necessary. If wiring is okay,
replace ignition control unit.

Fig. 5:  Checking Hall Control Unit Voltage (Typical)
Courtesy of Volkswagen United States, Inc.

         IDLE SPEED, CO LEVEL & IGNITION TIMING

         Ensure idle speed, CO level and base ignition timing are set

 

 

 

 

 

 

 

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