Mitsubishi Lancer Evolution IX. Manual — part 269

IGNITION SWITCH

CHASSIS ELECTRICAL

54A-13

TECHNICAL DESCRIPTION (COMMENT)

• This malfunction may be caused by a defective

immobilizer-ECU, engine-ECU, or a defect in the
communication line between the immobi-
lizer-ECU and engine-ECU. If this malfunction
appears when the MPI system and M.U.T.-II/III
can communicate each other, MPI system diag-
nosis code No.P0513 will reset.

• If the MPI system is normal, the engine control

relay can be determined as normal. In addition, if
the MPI system and M.U.T.-II/III can communi-
cate each other, the circuits between the diagno-
sis connector and the engine-ECU can
determined as normal.

NOTE: If this malfunction appears, MPI system diag-

nosis code No.P0513 will be set.

TROUBLESHOOTING HINTS

• Malfunction of the immobilizer-ECU.

• Malfunction of the engine-ECU.

• The wiring harness or connectors may have

loose, corroded, or damaged terminals, or termi-
nals pushed back in the connector.

DIAGNOSIS PROCEDURE

STEP 1. Check if M.U.T.-II/III can communicate
with the MPI system and if an MPI system
diagnosis code other than P0513 is set.

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

Is an MPI system diagnosis code other than P0513
set?
YES :

Go to Step 2.

NO :

Refer to GROUP 13A, Troubleshooting

P.13A-17

.

STEP 2. Voltage measurement at
immobilizer-ECU connector C-207-1.

AC310479

Connector: C-207-1 <L.H. drive vehicles>

Harness side

AH

AC310481

Connector: C-207-1 <R.H. drive vehicles>

Harness side

AH

(1) Disconnect immobilizer-ECU connector C-207-1.
(2) Turn the ignition switch to the "ON" position.

AC304844AC

Connector C-207-1
(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.

IGNITION SWITCH

CHASSIS ELECTRICAL

54A-14

STEP 3. Connector check: Immobilizer-ECU
connector C-207-1 and engine control relay
connector B-12X

AC310479

Connector: C-207-1 <L.H. drive vehicles>

Harness side

AH

AC310481

Connector: C-207-1 <R.H. drive vehicles>

Harness side

AH

AC310439

Connector: B-12X

Harness side

AD

Q: Are immobilizer-ECU connector C-207-1 and

engine control relay connector B-12X in good
condition?
YES :

Go to Step 4.

NO :

Repair or replace the damaged
component(s). Confirm that M.U.T.-II/III
communicates normally.

IGNITION SWITCH

CHASSIS ELECTRICAL

54A-15

STEP 4. Check the harness wires between
immobilizer-ECU connector C-207-1 (terminal 1)
and engine control relay connector B-12X
(terminal 4).

AC310479

Connector: C-207-1 <L.H. drive vehicles>

Harness side

AH

AC310481

Connector: C-207-1 <R.H. drive vehicles>

Harness side

AH

AC310439

Connector: B-12X

Harness side

AD

AC310447

Connectors: C-21, C-105, C-123
<L.H. drive vehicles>

C-21

C-105

C-105

C-123

AT

C-123(GR)

C-21

AC310455

C-105

C-124

C-105

C-124

AK

Connectors: C-105, C-124
<R.H. drive vehicles>

NOTE: Prior to the wiring harness inspection, check
intermediate connector C-123 <LH drive vehicles>,
C-124 <RH drive vehicles>, joint connector C-21 and
C-105 <LH drive vehicles>, C-105 <RH drive vehi-
cles> and key reminder switch connector C-207, and
repair if necessary.

IGNITION SWITCH

CHASSIS ELECTRICAL

54A-16

Q: Are the harness wires between immobilizer-ECU

connector C-207-1 (terminal 1) and engine control
relay connector B-12X (terminal 4) in good
condition?
YES :

There is no action to be taken.

NO :

Replace damaged component(s). Confirm
that M.U.T.-II/III communicates normally.

STEP 5. Resistance measurement at
immobilizer-ECU connector C-207-1.

AC310479

Connector: C-207-1 <L.H. drive vehicles>

Harness side

AH

AC310481

Connector: C-207-1 <R.H. drive vehicles>

Harness side

AH

(1) Disconnect immobilizer-ECU connector C-207-1.

AC304851AC

Connector 207-1
(Harness side)

(2) Measure the resistance between terminal 4 and

earth.

OK: 2 ohms or less

Q: Is the check result normal?

YES :

Go to Step 8.

NO :

Go to Step 6.

STEP 6. Connector check: immobilizer-ECU
connector C-207-1

AC310479

Connector: C-207-1 <L.H. drive vehicles>

Harness side

AH

AC310481

Connector: C-207-1 <R.H. drive vehicles>

Harness side

AH

Q: Is immobilizer-ECU connector C-207-1 in good

condition?
YES :

Go to Step 7.

NO :

Repair or replace the damaged
component(s). Confirm that M.U.T.-II/III
communicates normally.