1998 MITSUBISHI MONTERO battery

Fig. 6: Identifying Defogger Switch Terminals (3000GT)
Courtesy of Mitsubishi Motor Sales of America
DEFOGGER TIMER TEST
Montero
Remove defogger timer from interior relay block. Connect test
battery and test light to timer. See Fig. 7. Ensure test light
illuminates for about 11 seconds when battery voltage is applied to
terminal No. 3. Reapply battery voltage to terminal No. 3 and observe
test light. Test light should go off. If timer does not test as
specified, replace timer.
Fig. 7: Identifying Defogger Timer Terminals (Montero)
Courtesy of Mitsubishi Motor Sales of America
GRID TEST

1) Start and run engine at 2000 RPM. Ensure battery is fully
charged. Turn defogger switch to ON position. Using a voltmeter, check
voltage at center section of each defogger grid filament.
2) If voltage is about 6 volts, grid filament is okay. If
voltage is about 12 volts, an open is present in negative circuit.
Move probe slowly toward negative terminal to determine location of
open circuit.
3) If voltage is zero volts, an open is present in positive
circuit. Move probe slowly toward positive terminal to determine
location of open circuit. Repair grid as necessary. See
GRID FILAMENT REPAIR under ON-VEHICLE SERVICE.
ON-VEHICLE SERVICE
GRID FILAMENT REPAIR
Clean broken wire tips thoroughly. Place masking tape along
both sides of broken wire. See Fig. 8. Apply Repair Paste (DuPont
4817) to broken section of grid. Remove masking tape after paste has
dried. Wait 24 hours before using defogger.
Fig. 8: Repairing Rear Defogger Grid Element
REMOVAL & INSTALLATION
DEFOGGER SWITCH
Removal & Installation (Diamante)
Defogger switch is integral with A/C system ECU. To remove
A/C ECU, remove center console. Remove audio panel. Remove radio.
Remove A/C ECU. To install, reverse removal procedure.
Removal & Installation (Eclipse)
Remove upper stoppers from glove compartment. Drop down glove
compartment. From glove compartment opening, reach behind center air
outlet assembly and disconnect harness connectors to switches. Release
metal clips from center air outlet assembly. Remove center air outlet.
Remove defogger switch from center air outlet. To install, reverse
removal procedure.
Removal & Installation (Galant)

Connect air pressure gauge in-line to air hose from air pump.
Air pump is located in right storage area, under rear seat. Connect
battery voltage to air pump (positive lead to Red wire). The air pump
is operating correctly when the following sequences occur;
* Pump should operate for no more than 5 seconds.
* Pressure should be 4-6 psi (.28-.41 kg/cm
) within 10-20
seconds after pump has stopped.
* After air pump has stopped operating, it should not restart
operating for 5 minutes.
Center Differential Lock Operation Switch
See ANTI-LOCK BRAKE SYSTEM article in BRAKES.
Differential Lock Switch
Remove switch from center console. To test switch operation,
see Fig. 2 . Replace switch as needed.
Differential Lock Control Unit
See ANTI-LOCK BRAKE SYSTEM article in BRAKES.
Lock Detection Switch
1) Raise and support vehicle. Disconnect air hose connection
near rear differential. Connect air source with pressure regulator and
pressure gauge. Apply 4 psi (.28 kg/cm
) pressure. Disconnect lock
detection switch harness connector.
2) Using ohmmeter, check if continuity exists with air
pressure applied. Continuity should exist with air pressure applied.
If continuity exists, ensure axle is locked by attempting to turn rear
wheels separately of each other.
3) If continuity does not exist, go to step 4). If continuity\
does exist but axles are not locked, see CARRIER ASSEMBLY under
REMOVAL & INSTALLATION and inspect locking assembly.
4) Remove detection switch from housing. Using ohmmeter,
check continuity of switch. Continuity should exist with switch
plunger extended. With plunger in neutral position, continuity should
not exist. Replace switch as needed.
Fig. 2: Checking Differential Lock Switch Continuity
Courtesy of Mitsubishi Motor Sales of America.
REMOVAL & INSTALLATION

1) Connect pressure gauge with "T" joint to air pump
discharge outlet nozzle. See Fig. 1. Install air hose to differential.
Apply battery voltage to air pump connector. Note amount of time
between when air pump starts operating to when air pump stops
operating. If air pump stops within 5 seconds, internal pressure
switch is operating properly.
2) Measure pressure 10-20 seconds after air pump has stopped.
Pressure should be 4-6 psi (.28-.42 kg/cm
). If pressure is as
specified, internal release valve is operating properly. Ensure air
pump does not begin operating for 5 minutes after it has stopped.
Fig. 1: Testing Rear Differential Lock Air Pump
Courtesy of Mitsubishi Motor Sales of America.
REAR DIFFERENTIAL LOCK CONTROL UNIT

Using voltmeter, backprobe rear differential lock control
unit connector between terminal No. 6 (ground) and specified terminal
under specified conditions. See WIRING DIAGRAMS. See
REAR DIFFERENTIAL LOCK CONTROL UNIT VOLTAGE table. If voltage is not
as specified, replace control unit.
REAR DIFFERENTIAL LOCK CONTROL UNIT VOLTAGE









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Terminal No. Circuit Voltage
3 .................... Ignition Switch (IG1) ............ ( 1) Zero
3 .................... Ignition Switch (IG1) ......... ( 2) Battery
9 (ON side) ............. Rear Lock Switch .......... ( 2)( 3) Zero
1 (OFF side) ............ Rear Lock Switch ....... ( 2)( 4) Battery
10 ...................... Indicator Light ........... ( 2)( 5) Zero
10 ...................... Indicator Light ........ ( 2)( 6) Battery
2 .................. Vehicle Speed Reed Switch ............. ( 7) 5
8 ................. Rear Lock Detection Switch ...... ( 2)( 5) Zero
8 ................. Rear Lock Detection Switch ... ( 2)( 6) Battery
4 ..................... Rear Lock Air Pump ....... ( 2)( 8) Battery
4 ..................... Rear Lock Air Pump .......... ( 2)( 9) Zero
5 ................... Center Lock Operation ..... ( 2)( 10) Battery
5 ...................... Detection Switch ....... ( 2)( 10) Battery
5 ...................... Detection Switch .......... ( 2)( 11) Zero
( 1) - Ignition off.
( 2) - Ignition on.
( 3) - ON side or OFF side.
( 4) - In Neutral.
( 5) - Rear differential locked.
( 6) - Rear differential free.
( 7) - Select Drive or 1st gear and drive forward slowly.
( 8) - When filing or holding.
( 9) - When releasing.
( 10 ) - Center differential free.
( 11 ) - Center differential locked.









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REAR DIFFERENTIAL LOCK DETECTION SWITCH
NOTE: DO NOT apply more pressure than required to bring pressure
gauge reading to about 4 psi (.28 kg/cm).
1) Raise and support vehicle. Remove air pipe and air hose
connections. Connect a pressure gauge and air regulator (for adjusting
compressed air pressure) to air hose. See Fig. 2. Using air regulator,
adjust compressed air pressure until pressure gauge indicates about 4
psi (.28 kg/cm
).
2) While an assistant holds one wheel on one side of vehicle
stationary, slowly turn wheel on other side of vehicle. Using
ohmmeter, check for continuity between rear differential lock
detection switch connector terminals.
3) With air supplied, continuity should exist. With air
released, continuity should not exist. If continuity is not as
specified, replace lock detection switch.

Continuity should not be present with actuator set to LOCK position.
Left Rear Door (Montero)
1) Access and disconnect harness from left rear door lock
actuator. See DOOR LOCK ACTUATOR R & I under REMOVAL & INSTALLATION.
Set actuator in LOCK position. Connect positive lead of 12-volt power
source to actuator terminal No. 3 (Blue/Red wire). See WIRING DIAGRAMS
. Actuator should move to UNLOCK position when terminal No. 1
(Blue/Black wire) is connected to ground.
2) With actuator set in UNLOCK position, connect positive
lead of 12-volt power source to actuator terminal No. 1 (Blue/Black
wire). See WIRING DIAGRAMS . Actuator should move to LOCK position when
terminal No. 3 (Blue/Red wire) is connected to ground.
Right Rear Door (Montero)
1) Access and disconnect harness from right rear door lock
actuator. See DOOR LOCK ACTUATOR R & I under REMOVAL & INSTALLATION.
Set actuator in LOCK position. Connect positive lead of 12-volt power
source to actuator terminal No. 1 (Blue/Black wire). See
WIRING DIAGRAMS . Actuator should move to UNLOCK position when terminal
No. 3 (Blue/Red wire) is connected to ground.
2) With actuator set in UNLOCK position, connect positive
lead of 12-volt power source to actuator terminal No. 3 (Blue/Red
wire). See WIRING DIAGRAMS . Actuator should move to LOCK position when
terminal No. 1 (Blue/Black wire) is connected to ground.
DOOR LOCK POWER RELAY
1) Remove door lock relay. See COMPONENT LOCATIONS. Check for
continuity between relay terminals No. 1, 3 and 5, and terminals No.
4, 7 and 8. See RELAY TERMINAL IDENTIFICATION table. Continuity should
be present.
2) Apply positive battery voltage to relay terminal No. 7 and
ground to terminals No. 4 and 8. Check for continuity between relay
terminals No. 1 and 2, and terminals No. 2 and 3. See
RELAY TERMINAL IDENTIFICATION table. Continuity should be present.
Replace relay if continuity is not as specified.
RELAY TERMINAL IDENTIFICATION TABLE









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Application & Harness
Terminal No. Wire Color
Montero
1 ........................................... Blue/Green
2 ............................................ Red/White
3 .......................................... Blue/Orange
4 ............................................ Black/Red
5 ................................................ Black
7 ............................................ Red/Black
8 ......................................... Black/Yellow
3000GT (Relays No. 1 & 2)
1 ........................................... Blue/Black
2 ............................................ Red/Black
3 ............................................. Blue/Red
4 .......................................... Brown/White
5 ................................................ Black
7 ............................................ Red/Black
8 ........... Brown/Blue (No. 1) Or Yellow/Black (No. 2)









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DOOR LOCK CYLINDER SWITCH

NOTE: Testing information for RKE control unit is not available
from manufacturer at time of publication. See
PIN VOLTAGE TESTS .
NOTE: If after all testing procedures are completed, system is not
functioning properly, replace unit with a known-good keyless
entry control unit and retest.
POWER DOOR LOCK CONTROL UNIT
Montero (W/O Remote Keyless Entry)
1) Remove power door lock control unit. See
COMPONENT LOCATIONS . Apply battery voltage to control unit terminal
No. 8 (Red/Yellow wire). See WIRING DIAGRAMS.
2) Jumper control unit terminals No. 4 (Black wire), No. 5
(Blue/White wire), and No. 7 (Black/Yellow wire) to battery negative\
terminal. Connect an analog voltmeter between ground and terminal No.
3 (Blue/Red wire). Set voltmeter to DC volts.
3) Remove jumper from control unit terminal No. 5 or 7.
Voltmeter needle should deflect.
4) Jumper control unit terminals No. 4 (Black wire) and No. \
5
(Blue/White wire) to ground. Connect voltmeter between ground and
terminal No. 3 (Blue/Red wire). Jumper control unit terminal No. 7
(Black/Yellow wire) to ground. Voltmeter needle should deflect.
5) Jumper control unit terminal No. 4 (Black wire) to ground\
.
Connect voltmeter between ground and control unit terminal No. 3
(Blue/Red wire). Jumper control unit terminal No. 7 (Black/Yellow
wire) to ground. Voltmeter needle should not deflect.
6) Check if voltage is present between battery ground and
control unit terminals No. 2 (Black/Blue wire) and No. 6 (Black/Red
wire). Battery voltage should be present. If circuits do not test as
specified, replace door lock control unit.
BACK DOOR (LIFTGATE) LOCK ACTUATOR
Montero
Access door lock actuator. See DOOR LOCK ACTUATOR R & I under
REMOVAL & INSTALLATION. Disconnect back door actuator harness
connector. Remove actuator if needed. Connect positive lead of 12-volt
power source to actuator connector. Actuator should operate when
negative lead contacts actuator housing. Replace actuator as needed.
PIN VOLTAGE TESTS

When engine is off, fuel vapors are vented into charcoal
canister. When engine is warmed to normal operating temperature and
running at speeds greater than idle, PCM energizes purge control
solenoid valve, allowing vacuum to purge valve.
Canister vapors are then drawn through solenoid valve into
intake manifold for burning. Purge control solenoid valve remains
closed during idle and engine warm-up to reduce HC (hydrocarbons) and
CO (carbon monoxide) emissions.
POSITIVE CRANKCASE VENTILATION (PCV) VALVE
PCV valve operates in closed crankcase ventilation system.
Closed crankcase ventilation system consists of PCV valve, oil
separator, breather and ventilation hoses.
PCV valve is a one-way check valve located in valve cover.
When engine is running, manifold vacuum pulls PCV valve open, allowing
crankcase fumes to enter intake manifold. If engine backfires through
intake manifold, PCV valve closes to prevent crankcase combustion.
SELF-DIAGNOSTIC SYSTEM
NOTE: PCM diagnostic memory is retained by direct power supply
from battery. Memory is not erased by turning off ignition,
but it will be erased if battery or PCM is disconnected.
Self-diagnostic system monitors input and output signals
through the Data Link Connector (DLC). Diagnostic Trouble Codes (DTCs\
)
can only be read using a scan tester. For additional information, see
G - TESTS W/CODES article.
Malfunction Indicator Light (MIL)
MIL (CHECK ENGINE light) comes on when ignition is turned on.\
MIL remains on for several seconds after engine has started. If an
abnormal input signal occurs, MIL comes on and code is stored in
memory. If an abnormal input signal returns to normal, PCM turns MIL
off, but code remains stored in memory until it is cleared. If
ignition is turned on again, MIL will not come on until PCM detects
malfunction during system operation.