1987 SUZUKI GRAND VITARA Service Repair Manual

6. Disconnect heater blower motor and resistor
lead wires at the coupler.
7. Loosen heater case securing nut on the engine
room side.
4. When connecting heater hoses, route them
correctly making sure they are free from
twist.
Fig. 7-8
6. Remove heater ass’v.
Fig. 7-9
9. Remove heater blower motor.
Installation
Reverse the removal procedure for installation,
exercising care to the following.
1. Make definitely sure to insert holder plate
between holder and body,
2. When installing parts, be careful to prevent
wire harness from being caught between parts.
3. Clamp wire harness securely and make sure
that it does not contact sharp edge of any
part.
[For right hand steering vehicle]
Heater valve
Heater outlet hose
From intake inlet pipemanifold
[For left hand steering vehicle]
VTo waterFrom intakemanifoldinlet pipe
Fig. 7- 10
5. Refill the proper coolant. Refer to section 6.
7-6

NOTE:
Upon completion of all jobs, perform following
checks.
l Check to ensure that every joint of each
heater hose and pipe is free from leakage
of cooling water.
l Check to ensure that each control lever
operates smoothly and that car heater operates
correctly to each control lever position.
If found faulty, adjust by changing control
cable clamp position.
l Check to ensure that each wire harnessesI
are securely clamped.Ff- -r/g. 7-l 1
Heater & Ventilator Control Cable Routing
[For right hand steering vehicle]
6
1.Cool/hot cable2.Circ/fresh cable3.Room/def. cable4. Steering column holder
5.Car heater6. I Defroster hose
[For left hand’steering vehicle]
7-7

SECTION 8
IGNITION SYSTEM
CONTENTS
8-1. GENERAL DESCRIPTION...................................8-2
DISTRIBUTOR..........................................8-3
IGNITION COIL........................................
SPARK PLUG...........................................8-4
8-2.MAINTENANCE SERVICE................................. . .8-5
HIGH TENSION CORD.....................................8-5
SPARK PLUG............................................ . . 8-5
IGNITION COIL..........................................8-5
DISTRIBUTOR..........................................8-5
IGNITION TIMING....................................... .8-9
DISTRIBUTOR DRIVE GEAR............................... .8-10
8-3.IMPORTANT REMINDERS FOR INSTALLATION.............. . 8-11
DISTRIBUTOR......................................... . .8-11
8-4
8
8-1

8-l. GENERAL DESCRIPTION
The ignition system is of contact-pointless type (full-transistorized type).
The principal components of the ignition system are spark plugs, ignition coil, and distributor. The distri-
butor has a rotor, an ignitor, a signal generator, a vacuum advancer and a centrifugal advancer.
The signal generator is to generate the ignition signal and consists of a signal rotor, a magnet and a pickup
coil. The signal rotor is attached to the distributor shaft, and the magnet and the pickup coil are attached
to the generator base plate.
When the distributor shaft rotates, the magnetic flux passing through the pickup coil varies due to the
change in air gap between the pickup coil and the signal rotor. As a result, the alternating current voltage
is induced in the pickup coil. The voltage induced turns on and off the ignitor which switches off the
ignition coil primary current. Thus, the high voltage is induced in the secondary winding of ignition coil
and ignition sparks are generated at the spark plugs.
The distributor is a sort of rotary switch, whose rotor connects the four plugs, one at a time, to secondary
winding of the ignition coil through the wires called “high-tension” cords. Note that there are one high-
tension cord, from secondary winding to the center of the distributor cap, and four more high-tension
cords between the spark plugs and the four terminals on the cap.
NOTE:
Whereabouts of terminal connections are clearly indicated in the diagram below. When inspecting the
electrical wiring, refer to this diagram and check to be sure that each connection is tight Examine the
cords for torn insulation and for evidence of groundinq
8
r
6541
1.Spark plug2.Distributor3.Distributor rotor4.Signal rotor
5.Generator6.lgnitor7.Ignition coil8.Ignition switch
9.Battery
Fig. 8- 1
8-2

Distributor
1.Vacuum ControlJer2.Distributor cap
3.
Seal4. Distributor housing
5. Distributor driven gear
6.
Pin
7.
O-ring
8. Rotor
9. Signal generator dust cover
10. lgnitor dust cover
11. Signal generator
12. lgnitor
13. Generator base plate
14. Signal rotor
Fig. 8-2
[Timing advancer] [Vacuum advancer]
The distributor shaft, from its driven-gear end to
the rotor-carrying end, is not a single solid piece;
actually this shaft is in two pieces connected
together through the timing advancer. The
advancer is essentially a flyweight mechanism.
Timing advancing action is accomplished by
twisting the top shaft piece relative to the bot-
tom one in the direction of shaft rotation.
The single rotor is mounted on the top piece.
The twisting movement is produced by the
speed-dependent radia I (or spreading) move-
ments of the two flyweights.
In this vacuum-advance mechanism, when the
vacuum in the carburetor gets high, the pressure
acting on the diaphragm overcomes the spring
force in it and the controller rod attached to the
diaphragm is pulled. And the rod so pulled turns
the generator base plate counter to the direction
of the distributor shaft rotation (counterclock-
wise) to advance (quicken) the ignition. (Before
advanca)
(After advance)
Base
C
/ -Vacuum DiaphragTI
spring
Fig. 8-3
weight
Fig. 8-4
8-3

Ignition Coil
The ignition coil is a sort of miniature transfor-
mer and, as such, has an iron core around which
two coils are wound- primary and secondary
windings mentioned above. The two are so close
to each other that a sudden change in themagnetic flux produced by “primary current”
flowing in primary winding (in a less number of
coil turns) induces a very large electromotive force (voltage) in secondary winding (in a
greater number of coil turns). These live parts
are housed in a tight, insulator case topped by the cap. Note that the cap has three terminals:
one high-tension terminal and two low-tension
terminals.
High-tension terminal
Primary terminal
lt-
Case
It
Primary winding
II
Secondary winding
j- Core
m2 I,,,insulator
Fig. 8-5
Spark Plugs
Each new machine shipped from the factory is
fitted with standard plugs.
Copper core
Center electrode
Fig. 8-6 Insulator
Standard typeCold type
NGKBPRdESBPR-6ES
Nippon DensoWlGEXR-UW’LOEXR-U
8-4

8-2. MAINTENANCE SERVICEIgnition Coil
High Tension Cords
Check cord terminals for corrosion, breaks and
distortion, and cords for crack or deterioration.
Replace cord as necessary.
NOTE:
DO NOT bend or pull high tension cords to avoid
inside damage. Grip rubber boot when removing
orinstalling cords.
1. Rubber boot2. High tension cord
Fig. 8-7
Spark Plugs
Check following:
l Electrode wear
l Carbon deposits
l Insulator damage.
If any fault is found, replace plugs.
Check gap, and make sure that gap is within
specification. If gap is out of specification,
adjust it by bending ground (side) electrode.
I
Plug gap “A”0.7 - 0.8 mm
(0.027 - 0.031 in.)
Disconnect negative cable at battery. Disconnect
lead wires and high tension cord from ignition
coil. Remove ignition coil, and check it as
follows.
Measure primary coil resistance.
Using ohmmeter, measure resistance between
positive @ and negative @ terminals.
Primary coil
resistance1.35- 1.65D
Measure secondary coil resistance.
Using ohmmeter; measure resistance between
positive @ terminal and high tension terminal.
I
Secondary coil
resistanceI11.0 - 14.5 kSZ
I
NOTE:
Take readings when coil is about 20” C (66” F).
Fig. &9
Reverse removal procedure for installation.
When reinstalling, make sure that each connec-
tion is tight.
Distributor
[Distributor cap]
Leakage of high-tension energy for ignition
shows up as misfiring in the engine. It occursat
any part of the high-tension line where insula-
tion has failed or in a dirty distributor cap, that
is, an internally dirty cap.
A wider spark gap in the plug, a condition often
found in poorly cared spark plugs, promotes a
tendency of high-tension energy to find a short-
cut to ground.
Fig. 8-8
8-5

Cleanliness is very important for the distributor
cap. With a clean dry cloth, wipe off dust or
grime, if any, and inspect for any damaged
(scarred, scratched or cracked) part or any part
evidencing high-tension leakage inside the cap.
Be sure to replace such parts.
[Signal rotor air gap]
Signal rotor air gap0.2 - 0.4 mm
(0.008 - 0.016 in)
Check air gap and adjust it as necessary.
1. Remove distributor cap and rotor.
2. Using thickness gauge, measure air gap bet-
ween signal rotor tooth and generator.
1. Signal rotor
2. Generator
3. Signal rotof air gap
Fig. 8-l 1
3. If air gap is out of specification, adjust it.
Remove distributor and then ignitor.
Loosen 2 screws securing generator.
Using blade (-) screwdriver, move generator
and adjust air gap to specification.
1. lgnitor
2. Generator
3. Generator screw4. Signal rotor air gap5. Blade screwdriver
Fig. 8-12
After adjustment, tighten 2 screws and
recheck air gap. Install ignitor, rotor and
distributor cap.
Install distributor referring to p. 8-11.
[Generator]
1. Disconnect negative cable at battery. Remove
distributor, and then ignitor and generator.
2. Remove dust cover from ignitor.
3. Disconnect red and white wires from ignitor.
1. Dust cover2. lgnitor
3. White wire
4. Red wire5. Generator
Fig. 8-13
4. Connect ohmmeter to red and white wires,
and measure generator resistance.
Generator resistance should be within 130 -
190 ohms. If resistance is not within specifi-
cation, replace the generator.
8-6