Mitsubishi Galant. Manual — part 617

IGNITION SWITCH

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CHASSIS ELECTRICAL

54A-21

Inspection Procedure 3: Engine does not start (Cranking but no initial combustion).

TECHNICAL DESCRIPTION (COMMENT)
If the fuel injectors are not operating, there might be
a problem with the MFI system in addition to a
malfunction of the immobilizer system. It is normal for
this to occur if an attempt is made to start the engine
using a key that has not been properly registered.

TROUBLESHOOTING HINTS

•

Malfunction of MFI system

•

Malfunction of immobilizer-ECU

DIAGNOSIS

Required Special Tools:

•

MB991223: Harness Set

•

MB991502: Scan Tool

STEP 1. Check the battery positive voltage.
Measure the battery positive voltage during cranking.

Q: Is the voltage 8 volts or more?

YES : Go to Step 2.
NO : check the battery. Refer to

P.54A-5

. The engine

should start.

STEP 2. Check the immobilizer system DTC and MFI
system DTC.

Q: Which DTC resets, the immobilizer system DTC or the

MFI system DTC?
Immobilizer system DTC : Refer to

P.54A-10

.

MFI system DTC : Refer to GROUP 13A, Diagnosis

P.13A-

5

or GROUP 13B, Diagnosis

P.13B-4

.

No DTC : Go to Step 3.

STEP 3. Check the starting system.

Q: Does the engine start?

YES : Go to Step 4.
NO : Refer to GROUP 13A, Diagnosis

−

Symptom Chart

P.13A-22

or GROUP 13B, Diagnosis

−

Symptom

Chart

P.13B-22

. If a malfunction is not resolved,

replace the immobilizer-ECU. Then register the
password (secret code) and encrypted code. (Refer to

P.54A-23

.) The engine should start.

STEP 4. Recheck for malfunction

Q: Is a malfunction eliminated?

YES : This diagnosis is complete. (If no malfunction are not

found in all steps, an intermittent malfunction is
suspected. Refer to GROUP 00, How to Use
Troubleshooting/Inspection Service Points-How to
Cope with Intermittent Malfunction

P.00-8

.)

NO : Replace the immobilizer-ECU.

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CHASSIS ELECTRICAL

IGNITION SWITCH

54A-22

CHECK AT IMMOBILIZER-ECU

M1543007600199

TERMINAL VOLTAGE CHECK

SPECIAL TOOLS

M1543000600273

ACX01564 AB

TERMINAL NO.

SIGNAL

CHECKING
REQUIREMENT

TERMINAL VOLTAGE

3

Immobilizer-ECU ground

Always

0V

5

PCM

-

-

7

Immobilizer-ECU power supply

Ignition switch: "LOCK"
(OFF)

0V

Ignition switch: "ON"

Battery positive voltage

10

Ignition key ring antenna

-

-

11

Ignition key ring antenna

-

-

TOOL

TOOL NUMBER
AND NAME

SUPERSESSION

APPLICATION

MB991502 Scan tool
(MUT-II)

MB991496-OD

•

Immobilizer system check

•

Encrypted code
registration

MB991223
A:MB991219
B:MB991220
C:MB991221
D:MB991222
Harness set
A:Test harness
B:LED harness
C:LED harness

adapter

D:Probe

MB991223

Making voltage and
resistance measurements
during troubleshooting

A:Connect pin contact

pressure inspection

B:Power circuit inspection
C:Power circuit inspection
D:Commercial tester

connection

B991502

MB991223

A

B

C

D

AC

IGNITION SWITCH

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CHASSIS ELECTRICAL

54A-23

ON-VEHICLE SERVICE

ENCRYPTED CODE REGISTRATION METHOD

M1543008100131

Required Special Tool:

•

MB991502: Scan Tool (MUT-II)

CAUTION

Because registering the encrypted codes is done after all
previously-registered codes have been erased, you should
keep all of the ignition keys that have already been
registered accessible.
If the ignition key, Immobilizer-ECU, powertrain control module
is replaced or an ignition key is added, encrypted codes of all
the ignition keys must be registered. (A maximum of eight
different ignition key can be registered.) Moreover, when the
immobilizer-ECU has been replaced, you will need to use scan
tool MB991502 to register the immobilizer-ECU and input the
vehicle secret code and to register the password (secret code)
that the owner specifies into the immobilizer-ECU.

NOTE: powertrain control module has an encrypted code for
immobilizer-ECU, and the encrypted code is registered in the
immobilizer-ECU and ignition key.

POINTS TO NOTE DURING OPERATION

If none of the functions can be used, check the diagnostic
trouble codes, and after carrying out any necessary repairs,
repeat the operation.
If an incorrect password is input five times in a row, the
immobilizer-ECU judges that an unauthorized operation is
being attempted. Start-prevention mode will be set, and engine
operation will stop and all special functions will be disabled. If
the ignition switch is turned to "ON" position and left in that
position for approximately 20 minutes, "Unauthorized
operation, start- prevention mode" will be cancelled.

KEY ID REGISTER

CAUTION

To prevent damage to scan tool MB991502, always turn the
ignition switch to "LOCK" (OFF) position before
connecting or disconnecting scan tool MB991502.

NOTE:

.

•

Using the key ID register function will cause all key IDs that
have been previously registered in the immobilizer-ECU to
be erased. All keys need to be registered. Those which
have been registered before should be on hand before
using this function.

•

If registering more than one key, do not disconnect scan
tool MB991502 halfway through the registration process.

•

After registering key IDs, check that the engine can be
started using all of the keys that have been registered. If the
engine will not start, refer to Immobilizer System Diagnosis

P.54A-9

.

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CHASSIS ELECTRICAL

IGNITION SWITCH

54A-24

1. Connect scan tool MB991502 to data link connector (16

pin).

2. Turn the ignition switch to "ON" position.

3. At "System Select," press "YES"

4. Select "Immobilizer," press "YES".

5. Select "Special Func,"press "YES".

AC002883

16PIN

MB991502

AB

AC000522

AC

AC000523

AB

AC000530

AB