Mitsubishi Colt Ralliart. Manual - part 468

IGNITION SWITCH

CHASSIS ELECTRICAL

54A-17

Step 2. Connector check: Immobiliser-ECU 
connector B-49 and engine-ECU <M/T> or 
engine-CVT-ECU <CVT> connector A-08

AC509191

Connector: A-08

Harness side

AD

A-08 (GR)

AC509573

Connector: B-49

Harness side

AB

Q: Are immobiliser-ECU connector B-49 and 

engine-ECU <M/T> or engine-CVT-ECU <CVT> 
connector A-08 in good condition?
YES : 

Go to Step 3.

NO : 

Repair the defective connector.

Step 3. Check the harness wires between 
immobiliser-ECU connector B-49 (terminal 3) and 
engine-ECU <M/T> or engine-CVT-ECU <CVT> 
connector A-08 (terminal 120).

AC509191

Connector: A-08

Harness side

AD

A-08 (GR)

AC509573

Connector: B-49

Harness side

AB

NOTE: 

AC401053

AH

Connector: B-40

Prior to the wiring harness inspection, check interme-
diate connector B-40, and repair if necessary.

Q: Are the harness wires between immobiliser-ECU 

connector B-49 (terminal 3) and engine-ECU <M/T> 
or engine-CVT-ECU <CVT> connector A-08 
(terminal 120) in good condition?
YES : 

Go to Step 4.

NO : 

Repair the wiring harness.

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IGNITION SWITCH

CHASSIS ELECTRICAL

54A-18

Step 4. Check the communication with M.U.T.-III

Q: Can the system communicate with the M.U.T.-III?

YES : 

Go to Step 5.

NO : 

Refer to INSPECTION PROCEDURE 1 
"MPI system-related diagnostic code 
No.P0513 is set, and communication 
between M.U.T.-III and immobiliser cannot 
be established 

P.54A-13

"

Step 5. M.U.T.-III diagnosis code
Check whether the engine immobilizer sys-
tem-related diagnosis code is set.

Q: Is the diagnosis code set?

YES : 

Refer to 

P.54A-8

.

NO : 

Go to Step 6.

Step 6. Retest the system.
Check that the ignition key can be registered.

Q: Is the check result normal?

YES : 

The procedure is complete.

NO : 

Replace the immobilizer ECU, and then go 
to Step 7 .

Step 7. Retest the system.
Check that the ignition key can be registered.

Q: Is the check result normal?

YES : 

The procedure is complete.

NO : 

Replace the engine-ECU <M/T> or 
engine-CVT-ECU <CVT>.

Inspection procedure: 3 The Engine does not Start. (Cranking Occurs but Initial Combustion does 
not)

COMMENTS ON TROUBLE SYMPTOM

If the fuel injection does not work, the immobi-
liser-ECU and the MPI system may be defective. It is 
no problem with the malfunction above when the 
engine is started with unregistered ignition key.

POSSIBLE CAUSES

• Malfunction of MPI system

• Malfunction of immobiliser-ECU

DIAGNOSIS PROCEDURE

Step 1. Battery voltage check
Measure the battery voltage when cranking.

OK: 8 V or more

Q: Is the check result normal?

YES : 

Go to Step 2.

NO : 

Check the battery. Refer to 

P.54A-5

.

Step 2. M.U.T.-III other system diagnosis code
Check whether the MPI system-related diagnosis 
code is set.

Q: Is the diagnosis code set?

YES : 

Refer to GROUP 13A, Troubleshooting 

P.13A-20

.

NO : 

Go to Step 3.

Step 3. M.U.T.-III diagnosis code
Check whether the engine immobiliser sys-
tem-related diagnosis code is set.

Q: Is the diagnosis code set?

YES : 

Refer to 

P.54A-8

.

NO : 

Go to Step 4.

Step 4. Check that the engine starts. 

Q: Does the engine start?

YES : 

The procedure is complete.

NO : 

Refer to GROUP 13A, Troubleshooting 

P.13A-20

. Replace the immobiliser-ECU 

when the cause of the failure cannot tracked 
down by performing the troubleshooting. 

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IGNITION SWITCH

CHASSIS ELECTRICAL

54A-19

Inspection procedure: 4 Check the Power Supply and Earth Circuit to the Immobiliser-ECU. 

AC601476 AB

Immobilizer-ECU Power Source, Earth and Engine-ECU <M/T> or Engine-CVT-ECU <CVT>

Communication Line Circuit

IMMOBILIZER-
ECU

POWER
SOURCE

ENGINE
CONTROL
RELAY

ENGINE-ECU <M/T>
ENGINE-CVT-ECU <CVT>

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

CIRCUIT OPERATION

 Refer to 

P.54A-13

.

COMMENTS ON TROUBLE SYMPTOM

The power supply and earth circuit to the immobi-
liser-ECU may be defective. 

POSSIBLE CAUSES

• Damaged harness wires and connectors

DIAGNOSTIC PROCEDURE

Step 1. Connector check: Immobiliser-ECU 
connector B-49

AC509573

Connector: B-49

Harness side

AB

Q: Is the check result normal?

YES : 

Go to Step 2.

NO : 

Repair the defective connector.

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IGNITION SWITCH

CHASSIS ELECTRICAL

54A-20

Step 2. Voltage measurement at immobiliser-ECU 
connector B-49 in order to check the battery 
circuit of power supply system to the key 
reminder switch.

AC509573

Connector: B-49

Harness side

AB

(1) Disconnect the immobiliser-ECU connector B-49 

and measure the voltage at immobiliser-ECU 
connector B-49 harness side.

(2) Turn the ignition switch to “ON” position.

AC400965AN

Connector: B-49 
(Harness side)

(3) Measure the voltage between terminal 1 and 

earth.

OK: System voltage

Q: Is the check result normal?

YES : 

Go to Step 5.

NO : 

Go to Step 3.

Step 3. Connector check: Engine control relay 
connector B-106

Q: Is the check result normal?

YES : 

Go to Step 4.

NO : 

Repair the defective connector.

Step 4. Check the wiring harness between engine 
control relay connector B-106 (terminal 4) and 
immobiliser-ECU connector B-49 (terminal 1).

•

AC509573

Connector: B-49

Harness side

AB

AC313870

Connector: B-106

Junction block (Front view)

BF

Harness side

Check the power supply line for open circuit.
NOTE: 

AC401053

AH

Connector: B-40

Prior to the wiring harness inspection, check junction 

block connector B-131, and repair if necessary.

Q: Are the wiring harness between engine control 

relay connector B-106 (terminal 4) and 
immobiliser-ECU connector B-49 (terminal 1) in 
good condition?
YES : 

 Go to Step 5.

NO : 

Repair the wiring harness.

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