Mitsubishi Colt Ralliart. Manual - part 466

IGNITION SWITCH

CHASSIS ELECTRICAL

54A-9

DIAGNOSTIC TROUBLE CODE 
PROCEDURES

Code No.11 Transponder Communication System or Radio Interference of Encrypted Code.

AC601474 AB

Ignition Key Ring and Immobilizer-ECU 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 : Gray     R : Red     P : Pink     V : Violet

IMMOBILIZER-
ECU

KEY
REMINDER
SWITCH

IGNITION
KEY RING
ANTENNA

IGNITION KEY

TRANSPONDER

HIGH FREQUENCY
CIRCUIT

DIAGNOSIS CODE SET CONDITIONS

• Diagnosis code 11 may be set if other ignition 

keys or the equipment which trigger a radio inter-
ference are in the vicinity of the vehicle as it is 
being started.

• The transponder’s encrypted code is not sent to 

the immobiliser-ECU immediately after the igni-
tion switch is turned to "ON" position.

NOTE: Diagnosis code 11 is always set together with 
MPI system diagnosis code P0513.

POSSIBLE CAUSES

• Radio interference of the encrypted code

• Malfunction of ignition key

• Malfunction of immobiliser-ECU

DIAGNOSIS PROCEDURE

STEP 1. Check for presence of other key near the 
key in the ignition.

Q: Is there any other key near the key in the ignition?

YES : 

Move the other key well away from key 

being used. Retest the system.

NO : 

Go to Step 2.

STEP 2. Check for presence of the equipment 
which trigger a radio interference.

Q: Is there any equipment which the customer 

attached? For example, a plug-in air freshener and 
so on.
YES : 

Remove or disconnect the equipment. 

Retest the system.

NO : 

Go to Step 3.

STEP 3. Check that the engine start using the 
spare ignition key which encrypted code has 
been registered.

Q: Does the engine start using the spare ignition key 

for which the encrypted code has been registered?
YES : 

Replace the ignition key that does not work. 

Then register the password (secret key 
code) and encrypted code 

P.54A-23

. Retest 

the system.

NO : 

Go to Step 4.

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IGNITION SWITCH

CHASSIS ELECTRICAL

54A-10

STEP 4. M.U.T.-III diagnosis code
Check that the immobiliser-ECU sets a diagnosis 
code.

Q: Is the diagnosis code set?

YES (diagnosis cede No.11 is set) : 

Go to Step 5.

YES (diagnosis cede No.12 is set) : 

Code No.12 

The ignition key is unregistered or 
encrypted codes do not match.  Refer to 

P.54A-12

.

NO : 

The procedure is complete.

STEP 5. Resistance measurement the key 
reminder switch connector B-140.

•

AC401044

Connector: B-140

AB

Harness side

B-140(B)

Disconnect the key reminder switch connector 

B-140.

•

AC401646 AB

Connector B-140 
(Harness side)

Resistance between key reminder switch connector 

B-140 terminal No.3 and No.7.

OK: Continuity exists (2 

Ω or less)

Q: Is the check result normal?

YES : 

Go to Step 6.

NO : 

Replace the ignition key ring antenna. 
Retest the system.

STEP 6. Connector check: Immobiliser-ECU 
connector B-49 and key reminder switch 
connector B-140

AC509573

Connector: B-49

Harness side

AB

AC401044

Connector: B-140

AB

Harness side

B-140(B)

Q: Is the check result normal?

YES : 

Go to Step 7.

NO : 

Repair or replace the defective connector.

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IGNITION SWITCH

CHASSIS ELECTRICAL

54A-11

STEP 7. Check the wiring harness between 
immobiliser-ECU connector B-49 (terminal 7 and 
8) and key reminder switch connector B-140 
(terminal 3 and 7).

AC509573

Connector: B-49

Harness side

AB

AC401044

Connector: B-140

AB

Harness side

B-140(B)

Q: Are the wiring harness between immobiliser-ECU 

connector B-49 (terminal 7 and 8) and key reminder 
switch connector B-140 (terminal 3 and 7) in good 
condition?
YES : . 

Replace the immobiliser-ECU and then 

register the password (secret key code) and 
encrypted code (Refer to 

P.54A-23

). Retest 

the system.

NO : . 

Repair the wiring harness.

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IGNITION SWITCH

CHASSIS ELECTRICAL

54A-12

Code No.12 Encrypted Codes are Not the Same or Not Registered.

DIAGNOSIS CODE SET CONDITIONS

The encrypted code sent by the transponder is not 
the same encrypted code which is registered in the 
immobiliser-ECU.
NOTE: Diagnosis code 12 is always set together with 
MPI system diagnosis code P0513.

POSSIBLE CAUSES

• The encrypted code in the ignition key has not 

been properly registered 

• The encrypted code in the ignition key is initial 

value 

• Malfunction of immobiliser-ECU

DIAGNOSIS PROCEDURE

Resister the encrypted code.

Q: Was the encrypted code registered?

YES : 

The procedure is complete.

NO : 

Replace the immobiliser-ECU and register 
the password (secret key code) and on 
encrypted code (Refer to 

P.54A-23

).

Trouble symptom chart

M1543007201503

CAUTION

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

Trouble symptom

Inspection 
procedure No.

Reference page

MPI system-related diagnostic code No.P0513 is set, and 
communication between M.U.T.-III and immobiliser cannot 
be established.

1

P.54A-13

The ignition key cannot be registered with the M.U.T.-III.

2

P.54A-16

The engine does not start. (cranking occurs but initial 
combustion does not)

3

P.54A-18

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

4

P.54A-19

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