Mitsubishi Grandis. Manual - part 348

IGNITION SWITCH

CHASSIS ELECTRICAL

54A-11

DIAGNOSTIC TROUBLE CODE 
PROCEDURES

Code No.11 Trouble related to the communication with ignition key

DIAGNOSIS CODE SET CONDITIONS

This code is set if the ID code is sent to the 
immobilizer ECU from the ignition key when the 
ignition switch is turned to the ON position.

POSSIBLE CAUSES

• Damaged harness wires and connectors

• Malfunction of ignition key

• Malfunction of immobilizer ECU

DIAGNOSIS PROCEDURE

Step 1. Check that the engine is started with 
another registered ignition key.

Q: Is the check result normal?

YES : 

Replace the ignition key that cannot start 

the engine with new registered ignition key. 
Refer to 

P.54A-26

.

NO : 

Go to Step 2.

Step 2. MUT-III diagnosis code

Check that the immobilizer ECU sets a diagnosis 
code.

Q: Is the diagnosis code set?

YES (diagnosis cede No.11 is set) : 

Replace the 

immobilizer ECU and register the ignition 
key.

YES (diagnosis cede No.12 is set) : 

Code No.12 

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

P.54A-11

.

NO : 

The procedure is complete.

Code No.12 The ignition key is unregistered or ID codes do not match. 

DIAGNOSIS CODE SET CONDITIONS

This code is set when the ignition key is not 
registered with the immobilzer ECU.

POSSIBLE CAUSES

• The ignition key is not registered with the 

immobilzer ECU.

• Malfunction of immobilizer ECU

DIAGNOSIS PROCEDURE

Resister the encrypted code.

Q: Was the encrypted code registered?

YES : 

The procedure is complete.

NO : 

Replace the immobilizer ECU and register 
the encrypted code. (Refer to 

P.54A-26

.)

Ignition Key Ring and Immobilizer-ECU Circuit

HIGH-FREQENCY
CIRCUIT

POWER
SOURCE

IMMOBILIZER-
ECU

TRANSPONDER

IGNITION SWITCH

CHASSIS ELECTRICAL

54A-12

Trouble symptom chart

M1543007201321

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.

Trouble symptom

Inspection 
procedure No.

Reference page

Diagnosis code No.P0513 is set to the MPI system or the 
immobilizer ECU cannot communicate with the MUT-III.

1

P.54A-13

The ignition key cannot be registered with the MUT-III.

2

P.54A-17

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

3

P.54A-21

Check the power supply and earth circuit to the immobilizer 
ECU. 

4

P.54A-21

IGNITION SWITCH

CHASSIS ELECTRICAL

54A-13

SYMPTOM PROCEDURES

Inspection procedure: 1 Diagnosis code No.P0513 is set to the MPI system or the immobilizer ECU 
cannot communicate with the MUT-III.

COMMENTS ON TROUBLE SYMPTOM

The immobilizer ECU communicates with the MUT-III 
via the engine-ECU <M/T> or the engine-A/T-ECU. 

The communication error between the immobilizer 
ECU and the engine-ECU <M/T> or the 
engine-A/T-ECU may be occurred.

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

ENGINE-ECU <M/T>
OR
ENGINE-A/T-ECU <A/T>

ENGINE
CONTROL
RELAY

IMMOBILIZER-
ECU

POWER
SOURCE

Immobilizer-ECU Power Source, Earth and Engine-ECU <M/T> or Engine-A/T-ECU <A/T> Communication Line Circuit

NOTE

: LH drive vehicles
: RH drive vehicles

IGNITION SWITCH

CHASSIS ELECTRICAL

54A-14

POSSIBLE CAUSES

• Malfunction of immobilizer ECU power supply 

and earth

• Damaged harness wires between the 

engine-ECU <M/T> or the engine-A/T-ECU and 
the immobilizer ECU

DIAGNOSTIC PROCEDURE

Step 1. Connector check: Key reminder switch 
connector C-308 and engine-ECU <M/T> or 
engine-A/T-ECU <A/T> connector C-112

Q: Are key reminder switch connector C-308 and 

engine-ECU <M/T> or engine-A/T-ECU <A/T> 
connector C-112 in good condition?

YES : 

Go to Step 2.

NO : 

Repair the defective connector.

AC310615

AS

Harness side

Connector: C-112 <LHD>

C-112 (GR)

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AC310628AW

Harness side

Connector: C-112 <RHD>

C-112 (GR)

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AC310153AE

Connector: C-308 <LHD>

Harness side

AC310183

AE

Connector: C-308 <RHD>

Harness side