Mitsubishi Lancer (4A9 engine). Manual - part 89

IGNITION SWITCH

CHASSIS ELECTRICAL

54A-18

Tool

Number

Name

Use

MB990784

Ornament 
remover

Steering column cover removal

MB990784

IGNITION SWITCH

CHASSIS ELECTRICAL

54A-19

MB991955

a. MB991824
b. MB991827
c. MB991910
d. MB991911
e. MB991825
f. MB991826

M.U.T.-III sub-
assembly

a. Vehicle 

Communicati
on Interface 
(V.C.I.)

b. M.U.T.-III 

USB cable

c. M.U.T.-III 

Main harness 
A (Vehicles 
with CAN 
communicatio
n system)

d. M.U.T.-III 

Main harness 
B (Vehicles 
without CAN 
communicatio
n system)

e. M.U.T.-III 

Measurement 
adapter

f. M.U.T.-III 

Trigger 
harness

CAUTION

For vehicles with CAN 
communication, use M.U.T.-III 
main harness A to send 
simulated vehicle speed. If you 
connect M.U.T.-III main harness B 
instead, the CAN communication 
does not function correctly.
Diagnosis code, Data list and 
Actuator test check

MB991223

a. MB991219
b. MB991220
c. MB991221
d. MB991222

Harness set

a. Test harness
b. LED harness
c. LED harness 

adapter

d. Probe

Making voltage and resistance 
measurements during 
troubleshooting

a. For checking connector pin 

contact pressure

b. For checking power supply 

circuit

c. For checking power supply 

circuit

d. For connecting a locally sourced 

tester

Tool

Number

Name

Use

MB991910

MB991826

MB991955

MB991911

MB991824

MB991827

MB991825

a

b

c

d

e

f

DO NOT USE

MB991223

a

d

c

b

DO NOT USE

BA

IGNITION SWITCH

CHASSIS ELECTRICAL

54A-20

TROUBLESHOOTING

STANDARD FLOW OF DIAGNOSTIC 
TROUBLE SHOOTING

M1541201400140

Refer to Group 00 

− Contents of troubleshooting .

TROUBLE SYMPTOM CHART

M1541201100354

CAUTION

During diagnosis, a diagnosis code associated with other system may be set when the ignition switch 
is turned on with connector(s) disconnected. On completion, confirm all systems for diagnosis 
code(s). If diagnosis code(s) are set, erase them all.

MB992006

Extra fine probe

Continuity check and voltage 
measurement at harness wire or 
connector

Tool

Number

Name

Use

MB992006

Trouble symptom

Inspection 
procedure 
No.

Reference page

The ignition key cylinder illumination lamp does not illuminate/
extinguish normally. <vehicles with WCM>

1

Malfunction of the ignition switch power supply system

2

IGNITION SWITCH

CHASSIS ELECTRICAL

54A-21

SYMPTOM PROCEDURES

Inspection Procedure 1: Ignition key cylinder illumination lamp does not illuminate/extinguish 
normally. <vehicles with WCM>

CAUTION

Whenever the ECU is replaced, ensure that the input and output signal circuits are normal.

Ignition Key Cylinder Illumination Lamp Circuit

Wire colour code 
B : Black     LG : Light green     G : Green     L : Blue     W : White     Y : Yellow     SB : Sky blue 
BR : Brown     O : Orange     GR : Grey     R : Red     P : Pink     V : Violet     PU : Purple     SI : Silver

KEY
REMINDER
SWITCH
WHEN
REMOVING
KEY: ON

IGNITION KEY
CYLINDER
ILLUMINATION
LAMP

<VEHICLES
  WITHOUT KOS>

ETACS-ECU

AC612708

Connector: C-213 <LHD>

AU

AC612716 AL

Connector: C-213 <RHD>