Mitsubishi Colt Ralliart. Manual - part 467

IGNITION SWITCH

CHASSIS ELECTRICAL

54A-13

SYMPTOM PROCEDURES

Inspection procedure: 1 MPI System-related Diagnostic Code No.P0513 is Set, and Communication 
Between M.U.T.-III and Immobiliser cannot be Established.

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

COMMENTS ON TROUBLE SYMPTOM

The immobiliser-ECU communicates with the 
M.U.T.-III via the engine-ECU <M/T> or 
engine-CVT-ECU <CVT>. The communication error 
between the immobiliser-ECU and the engine-ECU 
<M/T> or engine-CVT-ECU <CVT> may be occurred.

POSSIBLE CAUSES

• Malfunction of immobiliser-ECU power supply 

and earth

• Damaged harness wires between the 

engine-ECU <M/T> or engine-CVT-ECU <CVT> 
and the immobiliser-ECU

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Index

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TOC

IGNITION SWITCH

CHASSIS ELECTRICAL

54A-14

DIAGNOSTIC PROCEDURE

Step 1. 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 2.

NO : 

Repair the defective connector.

Step 2. 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 3.

NO : 

Repair the wiring harness.

Main

Index

Group

TOC

IGNITION SWITCH

CHASSIS ELECTRICAL

54A-15

Step 3. Check the immoblizer-ECU power supply 
circuit and earth circuit (Refer to Inspection 
Procedure 4  "Check the immoblizer ECU power 
supply circuit and earth circuit" 

P.54A-19

.)

Q: Is the check result normal?

YES : 

Go to Step 4.

NO : 

Repair the power supply and earth circuit to 
the immobiliser-ECU.

Step 4. Retest the system.
Check that immobiliser-ECU communicates with the 
M.U.T.-III.

Q: Is the check result normal?

YES : 

Intermittent Malfunction (Refer to GROUP 

00 

− How to Use 

Troubleshooting/Inspection Service Points 

− 

How to Cope with Intermittent Malfunctions 

P.00-13

.)

NO : 

Replace the immobiliser-ECU, and then go 
to Step 5.

Step 5. Retest the system.
Check that immobiliser-ECU communicates with the 
M.U.T.-III.

Q: Is the check result normal?

YES : 

The procedure is complete.

NO : 

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

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Group

TOC

IGNITION SWITCH

CHASSIS ELECTRICAL

54A-16

INSPECTION PROCEDURE 2: The Ignition Key cannot be Registered with the M.U.T.-III.

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

If only some ignition keys cannot be registered, the 
ignition key itself may be defective. If no ignition key 
can be registered, the immobiliser-ECU may be 
defective.

POSSIBLE CAUSES

• Malfunction of ignition key

• Damaged harness wires and connectors

• Malfunction of immobiliser-ECU

• Malfunction of engine-ECU <M/T> or 

engine-CVT-ECU <CVT>

DIAGNOSTIC PROCEDURE

STEP 1. Check that no ignition key can be 
registered. 

Q: Can any of the ignition keys be registered?

YES : 

Replace the ignition key that cannot be 

registered with new registered ignition key.

NO : 

Go to Step 2.

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