Mitsubishi Montero (2004+). Manual — part 509

BATTERY

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CHASSIS ELECTRICAL

54A-5

BATTERY

ON-VEHICLE SERVICE

BATTERY CHECK

M1541001000193

WARNING

Battery posts, terminals and related accessories con-
tain lead and lead compounds. WASH HANDS AFTER
HANDLING.

BATTERY VISUAL INSPECTION (1)

The battery contains a visual test indicator which gives a green
signal when an adequate charge level exists, and a dark signal
when charging is required.

BATTERY VISUAL INSPECTION (2)

Make sure ignition switch is in "LOCK" (OFF) position and all
battery fed accessories are OFF.
1. Disconnect the negative cable from battery before

disconnecting the positive cable.

WARNING

Care should be taken in the event battery case is
cracked or leaking to protect hands from the electro-
lyte. A suitable pair of rubber gloves (not the house-
hold type) should be worn when removing battery by
hand.

2. Remove the battery from the vehicle.
3. Inspect battery carrier for damage caused by loss of acid

from battery. If acid damage is present, it is necessary to
clean area with a solution of clean warm water and baking
soda. Scrub area with a stiff bristle brush. Wipe clean with a
cloth moistened with ammonia or baking soda in water.

ACX01557

INDICATOR

AB

DARK EYE:CHARGING NECESSARY
GREEN:GOOD CONDITION

BATTERY

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4. Clean the battery, especially the top with same solutions as

described in step 3.

5. Inspect the battery case and cover for cracks. If cracks are

present, battery must be replaced.

6. Clean the battery post with a suitable battery post cleaning

tool.

7. Clean the inside surfaces of the terminal clamps with a

suitable battery terminal cleaning tool. Replace damaged or
frayed cables and broken terminal clamps.

8. Install the battery in the vehicle.
9. Connect the positive and negative cables to the battery in

the order of mention.

10.Tighten the clamp nut securely.

BATTERY CHARGING

M1541001100543

WARNING

When batteries are being charged, an explosive gas forms beneath the cover of each cell. Do
not smoke near batteries on charge or which have recently been charged. Do not break live
circuits at the terminals of the batteries on charge. A spark will occur where the live circuit is
broken. Keep all open flames away from the battery.

Battery electrolyte temperature may temporarily be allowed to rise to 55

°C (131°F). Increase of electrolyte

temperature above 55

°C (131°F) is harmful to the battery, causing deformation of battery cell, decrease in life

of battery, etc.

CHARGE RATE

If the test indicator is dark, the battery should be charged as outlined below. When the dot appears or when
maximum charge shown below is reached, charging should be stopped.

.

Charge Rate Chart

BATTERY TEST

M1541001200540

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 post 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.

BATTERY

80D26L-MF

Slow charging

5 amps 12 hours
10 amps 6 hours

Fast charging

20 amps 2.5 hours
30 amps 0.5 hours

IGNITION SWITCH

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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 15 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.

LOAD TEST CHART

LOAD TEST RATE CHART

IGNITION SWITCH

GENERAL DESCRIPTION

M1543009901371

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.

IMMOBILIZER SYSTEM

The immobilizer system consists of the ignition key,
the key ring antenna, the 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 the ignition key is lost
or another ignition key is added, the encrypted code
can be registered or erased by using scan tool.

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

Load test

300 amps

Cranking ratio (0

°F)

582 amps

Reserve capacity

133 minutes

Application

80D26L-MF

IGNITION SWITCH

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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 TORN ALARM DIAGNOSIS

M1543000700678

The Ignition key reminder tone alarms is controlled
by the Simplified Wiring System (SWS). For trouble-
shooting, refer to GROUP 54B, SWS Diagnosis

P.54B-22

.

IMMOBILIZER SYSTEM DIAGNOSIS

INTRODUCTION TO IMMOBILIZER SYSTEM DIAGNOSIS

M1543009901025

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 P1610 will
be output. In this case, observe the immobilizer sys-
tem troubleshooting.

IMMOBILIZER SYSTEM DIAGNOSTIC TROUBLESHOOTING STRATEGY

M1543006900700

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-15

.

ITEM

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.