Mitsubishi Pajero Pinin. Manual — part 149
ENGINE ELECTRICAL –
Starting System
16-26
BRUSH
1.
Check the brush for roughness of the surface that contacts
the commutator and check the brush length.
Limit: Wear limit line
2.
In case the contacting surface has been corrected or the
brush has been replaced, correct the contacting surface
by winding sandpaper around the commutator.
ARMATURE COIL SHORT-CIRCUIT TEST
1.
Place armature in a growler.
2.
Hold a thin steel blade parallel and just above while rotating
armature slowly in growler. A shorted armature will cause
blade to vibrate and be attracted to the core. Replace
shorted armature.
Caution
Clean the armature surface thoroughly before
checking.
3.
Check the insulation between each commutator segment
and armature coil core.
If there is no continuity, the insulation is in order.
ARMATURE COIL OPEN-CIRCUIT INSPECTION
Check the continuity between segments. If there is continuity,
the coil is in order.
Wear limit line
Growler
ENGINE ELECTRICAL –
Ignition System
16-27
IGNITION SYSTEM
GENERAL INFORMATION
This system is equipped with four ignition coils with
built-in power transistors for each of the cylinders.
Interruption of the primary current flowing in the
primary side of an ignition coil generates a high
voltage in the secondary side of the ignition coil.
The high voltage thus generated is applied to the
spark plugs to generate sparks.
The engine-ECU turns the power transistors inside
the ignition coils alternately on and off. This causes
the primary currents in the ignition coils to be
alternately interrupted and allowed to flow to fire
the cylinders in the order 1 – 3 – 4 – 2.
The engine-ECU determines which ignition coil
should be controlled by means of the signals from
the camshaft position sensor and the crank angle
sensor. It also detects the crankshaft position, in
order to provide ignition at the most appropriate
timing in response to the engine operation
conditions.
When the engine is cold or running at high altitudes,
the ignition timing is slightly advanced to provide
optimum performance. Furthermore, if knocking
occurs, the ignition timing is gradually retarded until
knocking ceases.
SYSTEM DIAGRAM
Engine-
ECU
Air flow sensor
Barometric pressure sensor
Intake air temperature sensor
Engine coolant temperature
sensor
Accelerator pedal position
switch
Camshaft position sensor
Crank angle sensor
Ignition switch-ST
Detonation sensor
Vehicle speed sensor
Inhibitor switch
Ignition switch
Battery
Ignition coil
Spark plug
Cylinder No.
To tachometer
4
3
2
1
A/T-ECU
ENGINE ELECTRICAL –
Ignition System
16-28
IGNITION COIL SPECIFICATIONS
Items
Specifications
Type
Molded 4-coil
SPARK PLUG SPECIFICATIONS
Items
Specifications
NGK
IZFR6B
SERVICE SPECIFICATIONS
SPARK PLUG
Items
Standard value
Limit
Spark plug gap mm
0.5 – 0.6
0.75
Spark plug insulation resistance M
Ω
–
1
SPECIAL TOOL
Tool
Number
Name
Use
MD998773
Detonation sensor
wrench
Detonation sensor removal and installation
ENGINE ELECTRICAL –
Ignition System
16-29
ON-VEHICLE SERVICE
IGNITION COIL (WITH BUILT-IN POWER
TRANSISTOR) CHECK
Check by the following procedure, and replace if there is a
malfunction.
PRIMARY COIL AND POWER TRANSISTOR
CONTINUITY CHECK
NOTE
1.
An analogue-type circuit tester should be used.
2.
Connect the negative (–) prove of the circuit tester to
terminal 1.
Caution
This test must be performed quickly (in less than 10
seconds) to prevent coil from burning and power transistor
from breakage.
Voltage: 1.5V
Terminal No.
g
1
2
3
When current is
flowing
When current is
not flowing
SECONDARY COIL CHECK
NOTE
It is impossible to check the secondary coil through the
continuity check as a diode is integrated in the secondary
coil circuit of this ignition coil. So, check the secondary coil
in the following procedure.
1.
Disconnect the ignition coil connector.
2.
Remove the ignition coil and install a new spark plug to
the ignition coil.
3.
Connect the ignition coil connector.
4.
Earth the side electrode of the spark plug and crank the
engine.
5.
Check that spark is produced between the electrodes of the
spark plug.
6.
If no spark is produced, replace the ignition coil with a
new one and recheck.
7.
If spark is produced with the new ignition coil, replace
the old one as it is faulty. If no spark is produced again,
the ignition circuit is suspected as faulty. Check the ignition
circuit.
+
1.5 V
+
–
–
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