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

+

–

–