Mitsubishi Galant (2004+). Manual — part 1441

BATTERY

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CHASSIS ELECTRICAL

54A-7

BATTERY TEST

M1541001200528

BATTERY TESTING PROCEDURE

STEP 1. Check the battery cables.

Remove the negative cable, then the positive cable.
Check for dirty or corroded connections.

Q: Are the battery cables dirty or have corroded

connections?

YES :

Clean the battery cables. Then go to Step 2.

NO :

Go to Step 2.

STEP 2. Check the battery post.

Check for loose battery post.

Q: Are the battery posts faulty?

YES :

Replace the battery. Then go to Step 4.

NO :

Go to Step 3.

STEP 3. Check the battery case and cover.
(1) Remove the hold-downs and shields.
(2) Check for broken/cracked case or cover.

Q: Is the battery case or cover faulty?

YES :

Replace the battery. Then go to Step 4.

NO :

Go to Step 4.

STEP 4. Check the open circuit voltage.
(1) Turn headlights on for 15 seconds.
(2) Turn headlights off for two minutes to allow

battery positive voltage to stabilize.

(3) Disconnect the battery cables.
(4) Read open circuit voltage.

Q: Is open circuit voltage 12.4 volts or more?

YES :

Go to Step 5.

NO :

Charge the battery at 5 amps for 10.4 hours.
Then re-test.

STEP 5. Check the load test.
(1) Connect a load tester to the battery.
(2) Load the battery at the recommended discharge

rate (See LOAD TEST RATE CHART) for 15
seconds.

(3) Read voltage after 15 seconds, then remove

load.

(4) Compare the measured value with the minimum

voltage (See LOAD TEST CHART).

Q: Is the voltage higher than minimum voltage?

YES :

The battery is normal.

NO :

Replace the battery. Then go to Step 4.

IGNITION SWITCH

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CHASSIS ELECTRICAL

54A-8

LOAD TEST RATE CHART

LOAD TEST CHART

IGNITION SWITCH

GENERAL DESCRIPTION

M1543000100331

IGNITION KEY REMINDER TONE ALARM

.

The ignition key reminder tone alarm will sound
under the following condition, and warn the driver to
remove the ignition key.

• The driver's door is opened when the ignition

switch is at "LOCK" (OFF) or "ACC" position with-
out removing the ignition key.

However, the light reminder tone alarm will take pre-
cedence over this function.

DOOR LOCK PREVENTION FUNCTION

.

If the key is left in the ignition switch while the driver’s
door opened or the assistant door opened, all door
are automatically unlock to prevent locking the igni-
tion key in the vehicle after door is locked.

IMMOBILIZER SYSTEM

.

The immobilizer system consists of the ignition key,
the key ring antenna, immobilizer-ECU, and the
PCM. The ignition key has a built-in transponder. The
key ring antenna is installed on the steering lock key
cylinder. Only the registered ignition key permits the
engine to start, therefore, the engine can never be
started by means of a forged key or by connecting
the ignition wiring directly. The system is significantly
safe and reliable against theft. In addition, the driver
has only to turn the ignition switch to the "ON" posi-
tion to activate the immobilizer system. If the require-

ments for starting the engine are not satisfied, the
engine will be immobilized. If a registered ignition key
is lost, all your ignition keys need to be registered
again using scan tool MB991958 (MUT-III Sub
Assembly) to ensure security (Refer to

P.54A-40

).

An additional ignition key can be registered as fol-
lows (only if no ignition keys are lost):

• Using scan tool MB991958 (MUT-III Sub Assem-

bly) (Refer to

P.54A-40

).

• By operating two ignition keys that have been

already registered (Refer to

P.54A-40

).

.

OPERATION
1. When the ignition switch is turned to "ON"

position, the PCM sends a requirement for the
encrypted code to the immobilizer-ECU (at this
time, the engine is remobilized).

2. When the immobilizer-ECU receives the

requirement from the PCM, the immobilizer-ECU
supplies power to the transponder inside the
ignition key via the antenna. The energized
transponder sends the encrypted code back to the
immobilizer-ECU via the antenna.

3. The immobilizer-ECU judges the encrypted code

with its code logic in itself. If they are identical, the
immobilizer-ECU sends the encrypted code to the
PCM.

4. If the PCM can not receive the encrypted code,

the engine will be immobilized.

Load test

252 amps

Cranking ratio (0

°F)

525 amps

550 amps

Reserve capacity

90 minutes

115 minutes

Application

BCI Group size 86

BCI Group size 24

TEMPERATURE

°C

(

°F)

21 (70)
AND
ABOVE

16 (60)

10 (50)

4 (40)

−1 (30)

−7 (20)

−12 (10) −18 (0)

Minimum voltage

9.6

9.5

9.4

9.3

9.1

8.9

8.7

8.5

IGNITION SWITCH

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CHASSIS ELECTRICAL

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CAUTION WHEN REPLACING IMMOBILIZER SYSTEM RELATED PARTS
To replace immobilizer system related parts, refer to the table below. When the ignition key is re-registered
with scan tool MB991958, the originally registered ignition key registration information will be lost.

IGNITION KEY REMINDER TONE ALARM AND DOOR LOCK PREVENTION FUNCTION
DIAGNOSIS

M1543000701046

The Ignition key reminder tone alarms and door lock
prevention function are controlled by the Simplified
Wiring System (SWS). For troubleshooting, refer to
GROUP 54B, SWS Diagnosis

P.54B-59

.

AC306415AB

TRANS-
PONDER

POWER
(WIRELESS)

ENCRYPTED
CODE (WIRELESS)

MUT-III

POWERTRAIN
CONTROL
MODULE

CONTROL
SIGNAL

IGNITION
KEY RING
ANTENNA

IMMOBILIZER-
ECU

ITEMS

PCM

IMMOBILIZER-ECU

IGNITION KEY

When replacing PCM

-

Replacement is not
required

Replacement is not required.
Re-registration are required.

When rewriting PCM

-

Replacement is not
required

Replacement is not required.
Re-registration is not required.

When replacing
immobilizer-ECU

Replacement not
required

-

Replacement is not required.
Re-registration is required.

When adding ignition keys
newly (if registered ignition
keys are not lost)

Replacement not
required

Replacement is not
required

Register only additional ignition
keys to be registered.

When adding ignition key
newly (if registered ignition
keys are lost)

Replacement not
required

Replacement is not
required

Register ignition key to be
added and re-register all other
ignition keys.

When ignition key is lost

Replacement not
required

Replacement is not
required

Re-register all other ignition
keys except the lost one.

IGNITION SWITCH

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CHASSIS ELECTRICAL

54A-10

IMMOBILIZER SYSTEM DIAGNOSIS

INTRODUCTION TO IMMOBILIZER SYSTEM DIAGNOSIS

M1543009901326

CAUTION

The encrypted code should always be re-regis-
tered when replacing the immobilizer-ECU.
The immobilizer system consists of the immobi-
lizer-ECU, PCM, ignition key and ignition key ring
antenna. If the engine cannot be started by using a
registered ignition key, one of these components
may be defective. If the immobilizer system has
immobilized the engine, MFI system DTC P0513 will
be output. In this case, observe the immobilizer sys-
tem troubleshooting.

IMMOBILIZER SYSTEM DIAGNOSTIC TROUBLESHOOTING STRATEGY

M1543006900670

Use the following steps to plan your diagnostic strat-
egy.
1. Gather information about the problem from the

customer.

2. Verify that the condition as described by the

customer exists.

3. Check the vehicle for any immobilizer system

DTCs.

4. If you cannot verify the condition and there are no

immobilizer system DTCs, the malfunction is
intermittent. Refer to GROUP 00, How to Use
Troubleshooting/inspection Service Points

− How

to Cope with Intermittent Malfunctions

P.00-6

.

5. If you can verify the condition but there are no

immobilizer system DTCs, or the system cannot
communicate with scan tool MB991958, refer to
Symptom Chart and find the fault

P.54A-18

.

6. If there is an immobilizer system DTC, record the

DTC, then erase it from the memory using scan
tool MB991958.

7. Recreate the immobilizer system DTC set

conditions to see if the same immobilizer system
DTC will resets.
(1) If the same immobilizer system DTC resets,

perform the appropriate diagnostic procedure.
Refer to Diagnostic Trouble Code Chart

P.54A-13

.

(2) If the same immobilizer system DTC does not

reset, the malfunction is intermittent. Refer to
GROUP 00, How to Use
Troubleshooting/inspection Service Points

−

How to Cope with Intermittent Malfunctions

P.00-6

.