Mitsubishi Lancer Evolution IX. Manual - part 352

STARTING SYSTEM

ENGINE ELECTRICAL

16-25

BRUSHES

AK202846

Brush 
height

AB

1. Check the commutator contacting surface of each 

brush for abnormal roughness. Also check the 
height of the brush. Replace the brush holder if 
the height is lower than the limit.

Limit: 7.0 mm

2. When the contact surface of the brush is rectified 

or the brush holder is replaced, recondition the 
contact surface with sandpaper wrapped around 
the commutator.

ARMATURE COIL

1. Check the armature coil for short circuit as 

follows:

AK202733

Growler

AB

2. Set the armature in a growler.

CAUTION

Clean the surface of the armature thoroughly 
before performing the test.
3. While holding a thin strip of iron against the 

armature in parallel with its axis, turn the armature 
slowly. The armature is normal if the iron strip is 
not attracted to the armature or it does not vibrate.

AK202734

4. Check the insulation between commutator 

segments and armature coils. The armature coils 
are properly insulated if no continuity is present.

AK202713

5. Check continuity between a segment and another. 

There is no open circuit in the tested coil if there is 
continuity.

MAGNETIC SWITCH

AK202891

A

M  terminal

AB

1. Coil open circuit test

• Check that there is continuity between the M ter-

minal and body A.

• If there is no continuity, replace the magnetic 

switch.

AK202892

M terminal

B terminal

AB

IGNITION SYSTEM

ENGINE ELECTRICAL

16-26

2. Contact fusion check

• Check that there is no continuity between the B 

terminal and M terminal.

•

AK202893

M terminal

B terminal

AB

If there is continuity, replace the magnetic switch.

3. Switch contact check

• Push the indicated end of the magnetic switch 

with a strong force to close the internal contacts. 
Without releasing the switch end, check that 
there is continuity between the B terminal and M 
terminal.

• If there is no continuity, replace the magnetic 

switch.

IGNITION SYSTEM

GENERAL INFORMATION

M1163000100614

This system is equipped with two ignition coils (A and 
B) with built-in power transistors for the No. 1 and 
No. 4 cylinders and the No. 2 and No. 3 cylinders 
respectively.
Interruption of the primary current flowing in the pri-
mary side of ignition coil A generates a high voltage 
in the secondary side of ignition coil A. The high volt-
age thus generated is applied to the spark plugs of 
No. 1 and No. 4 cylinders to generate sparks. At the 
time that the sparks are generated at both spark 
plugs, if one cylinder is at the compression stroke, 
the other cylinder is at the exhaust stroke, so that 
ignition of the compressed air/fuel mixture occurs 
only for the cylinder which is at the compression 
stroke.
In the same way, when the primary current flowing in 
ignition coil B is interrupted, the high voltage thus 
generated is applied to the spark plugs of No. 2 and 
No. 3 cylinders.

The engine-ECU turns the two 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 which is incorporated in 
the camshaft and from the crank angle sensor which 
is incorporated in the crankshaft. It also detects the 
crankshaft position in order to provide ignition at the 
most appropriate timing in response to the engine 
operation conditions. It also detects the crankshaft 
position in order to provide ignition at the most 
appropriate timing in response to the engine opera-
tion conditions.
When the engine is cold or operated at high alti-
tudes, the ignition timing is slightly advanced to pro-
vide optimum performance.

IGNITION SYSTEM

ENGINE ELECTRICAL

16-27

SYSTEM DIAGRAM

AK101074

Air flow sensor

Intake air temperature
sensor

Engine coolant
temperature sensor

Camshaft position
sensor

Crank angle sensor

Barometric pressure
sensor

Detonation sensor

Vehicle speed 
sensor

Ignition switch-ST

Engine-ECU

Ignition coil B

Cylinder No.

2

3

4

AH

1

Spark plug

Ignition coil A

Ignition
switch

Battery

IGNITION COIL SPECIFICATION

Item

Specification

Type

Molded 2-coil

SPARK PLUG SPECIFICATIONS

Item

Specifications

NGK

ILFR7H

SERVICE SPECIFICATIONS

M1163000300403

IGNITION COIL

Item

Standard value

Secondary coil resistance k

Ω

8.5 

− 11.5

SPARK PLUG

Item

Standard value

Limit

Spark plug gap mm

0.5 

− 0.6

0.75

SPARK PLUG CABLE

Item

Standard value

Limit

Resistance k

Ω

−

Maximum 19

IGNITION SYSTEM

ENGINE ELECTRICAL

16-28

SPECIAL TOOL

M1163000600288

Tool

Number

Name

Use

MD998773

Detonation sensor 
wrench

Detonation sensor 
removal and installation

ON-VEHICLE SERVICE

IGNITION COIL (WITH BUILT-IN POWER TRANSISTOR) CHECK

M1163001200614

Check by the following procedure, and replace if 
there is a malfunction.

SECONDARY COIL RESISTANCE CHECK

AKX01264

Measure the resistance between the high-voltage 
terminals of the ignition coil.

Standard value: 8.5 

− 11.5 kΩ

PRIMARY COIL AND POWER TRANSIS-
TOR CONTINUITY CHECK

NOTE: 

.

•

AK501917

1 2 3

AB

1.5 V

+

–

 An analogue-type circuit tester should be used.

•

Connect the negative (-) prove of the circuit tester 
to terminal No. 1.

CAUTION

This test must be performed quickly (in less than 
10 seconds) to prevent coil from burning and 
power transistor from breakage.

1.5 V power supply 
between 2 

− 3

Continuity between 1 

− 

2

When current is flowing

Continuity

When current is not 
flowing

No continuity

IGNITION COIL RELAY CHECK <RH 
DRIVE VEHICLES>

M1163006500029

CAUTION

The top and bottom of the ignition coil relay are 
difficult to identify. The triangle mark on the relay 
surface should be uppermost.

AC311402AB

1. Removal the ignition coil relay.