Suzuki Grand Vitara JB416 / JB420 / JB419. Manual — part 198
1H-12 Ignition System: For Petrol Engine Model
Specifications
Tightening Torque Specifications
S6JB0A1807001
Reference:
For the tightening torque of fastener not specified in this section, refer to “Fastener Information in Section 0A”.
Special Tools and Equipment
Special Tool
S6JB0A1808001
Fastening part
Tightening torque
Note
N
⋅m
kgf-m
lb-ft
Spark plug
25
2.5
18.0
Ignition coil bolt for M16 engine
10
1.0
7.5
Ignition coil bolt for J20 engine
6.5
0.65
5.0
09930–76420
SUZUKI scan tool
Timing-light (dry cell type)
—
This kit includes following
items. 1. Tech 2, 2. PCMCIA
card, 3. DLC cable, 4. SAE
16/19 adapter, 5. Cigarette
cable, 6. DLC loop back
adapter, 7. Battery power
cable, 8. RS232 cable, 9.
RS232 adapter, 10. RS232
loop back connector, 11.
Storage case, 12. )
Starting System: For Petrol Engine Model 1I-1
Engine
Starting System
For Petrol Engine Model
Precautions
Cranking System Note
S6JB0A1910001
NOTE
Starting motor varies depending on specifications, etc.
Therefore, be sure to check model and specification of the vehicle being serviced before replacing
parts.
General Description
Cranking Circuit Introduction
S6JB0A1911001
The cranking circuit consists of the battery, starting motor, ignition switch, and related electrical wiring. These
components are connected electrically.
Starting Motor Circuit Description
S6JB0A1911002
• The magnetic switch coils are magnetized when the ignition switch is closed.
• The resulting plunger and pinion drive lever movement causes the pinion to engage the engine flywheel gear and
the magnetic switch main contacts to close, and cranking takes place.
• When the engine starts, the pinion over-running clutch protects the armature from excessive speed until the switch
is opened, at which time the return spring causes the pinion to disengage.
I5JB0A190004-01
1. Pinion drive lever
6. Magnetic switch contacts
11. Ignition & Starter switch
2. Pinion & Over-running clutch
7. Pull-in coil
12. Battery
3. Magnetic switch
8. Starting motor
13. To ECM
4. Hold-in coil
9. Starting motor control relay
5. Plunger
10. A/T: Transmission range switch (shift lever switch)
1I-2 Starting System: For Petrol Engine Model
Diagnostic Information and Procedures
Cranking System Symptom Diagnosis
S6JB0A1914001
Possible symptoms due to starting system trouble would be as follows:
• Starting motor does not run (or runs slowly)
• Starting motor runs but fails to crank engine
• Abnormal noise is heard
Proper diagnosis must be made to determine exactly where the cause of each trouble lies in battery, wiring harness,
(including starting motor switch), starting motor or engine.
Do not remove motor just because starting motor does not run. Check the following items and narrow down scope of
possible causes.
1) Condition of trouble
2) Tightness of battery terminals (including ground cable connection on engine side) and starting motor terminals
3) Discharge of battery
4) Mounting of starting motor
Condition
Possible cause
Correction / Reference Item
Motor not running – No
operating sound of
magnetic switch
Transmission range sensor is not in P or
N, or not adjusted (A/T)
Shift in P or N, or adjust sensor.
Malfunction of clutch pedal position
switch (M/T)
Adjust or replace.
Battery run down
Recharge battery.
Battery voltage too low due to battery
deterioration
Replace battery.
Poor contact in battery terminal
connection
Retighten or replace.
Loose grounding cable connection
Retighten.
Fuse set loose or blown off
Tighten or replace.
Poor contacting action of ignition switch
and magnetic switch
Replace.
Lead wire coupler loose in place
Retighten.
Open-circuit between ignition switch and
magnetic switch
Repair.
Open-circuit in pull-in coil
Replace magnetic switch.
Brushes are seating poorly or worn
down
Repair or replace.
Poor sliding or plunger and/or pinion
Repair.
Faulty starting motor control relay
“Control Relay Inspection: For Petrol Engine
Model in Section 1C”.
Faulty ECM and its circuit
“Inspection of ECM and Its Circuits: For Petrol
Engine Model in Section 1A”.
Motor not running –
Operating sound of
magnetic switch heard
Battery run down
Recharge battery.
Battery voltage too low due to battery
deterioration
Replace battery.
Loose battery cable connections
Retighten.
Burnt main contact point, or poor
contacting action of magnetic switch
Replace magnetic switch.
Brushes are seating poorly or worn
down
Repair or replace.
Weakened brush spring
Replace.
Burnt commutator
Replace armature.
Layer short-circuit of armature
Replace.
Crankshaft rotation obstructed
Repair.
Starting System: For Petrol Engine Model 1I-3
Starting Motor Performance Test
S6JB0A1914002
CAUTION
!
Each test must be performed within 3 – 5 seconds to avoid coil from burning.
Pull-In Test
1) Connect battery to magnetic switch as shown.
2) Check that plunger and pinion move outward. If plunger and pinion don’t move, replace magnetic switch.
NOTE
Before testing, disconnect lead wire from terminal “M”.
Starting motor running,
but too slow (small
torque) – Battery and
wiring are satisfactory
Insufficient contact of magnetic switch
main contacts
Replace magnetic switch.
Layer short-circuit of armature
Replace.
Disconnected, burnt or worn
commutator
Repair commutator or replace armature.
Worn brushes
Replace brush.
Weakened brush springs
Replace spring.
Burnt or abnormally worn end bush
Replace bush.
Starting motor running,
but not cranking engine
Worn pinion tip
Replace over-running clutch.
Poor sliding of over-running clutch
Repair.
Over-running clutch slipping
Replace over-running clutch.
Worn teeth of ring gear
Replace flywheel (M/T) or drive plate (A/T).
Noise
Abnormally worn bush
Replace bush.
Worn pinion or worn teeth of ring gear
Replace over-running clutch, flywheel (M/T) or
drive plate (A/T).
Poor sliding of pinion (failure in return
movement)
Repair or replace.
Worn internal or planetary gear teeth
Replace.
Lack of oil in each part
Lubricate.
Starting motor does not
stop running
Fused contact points of magnetic switch Replace magnetic switch.
Short-circuit between turns of magnetic
switch coil (layer short-circuit)
Replace magnetic switch.
Failure of returning action in ignition
switch
Replace.
Condition
Possible cause
Correction / Reference Item
1. Terminal “S”
2. Terminal “M”
3. Lead wire (switch to motor)
IYSQ01190003-01
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