Mitsubishi Montero (1998+). Manual - part 98

DIFFERENTIAL LOCK - REAR 

1998 Mitsubishi Montero

         1997-98 DRIVE AXLES

         Mitsubishi Rear Differential Lock

         Montero, Montero Sport

         DESCRIPTION & OPERATION

         The rear differential lock system is designed to be used only

when low-speed wheel spin occurs in a ditch, or on a slippery or

uneven surface. The indicator light will blink when switch is turned

on as system completes locking operation. After the differential is

locked, the light will stop blinking and remain on.

         The rear differential lock system will not lock with vehicle

in 4H or 2H position, and if vehicle speed is greater than 7 MPH.

Vehicle speed should be maintained at less than 12 MPH during rear

differential lock operation.

NOTE:    The Anti-lock Brake System (ABS) does not operate when the

         rear differential is locked. It is normal for the ABS

         warning light to be on at this time.

         COMPONENT LOCATIONS

         Rear Differential Lock Air Pump

         Air pump is located under left side of rear seat.

         Rear Differential Lock Control Unit

         Control unit is located under left side lower quarter trim

panel in rear compartment.

         Rear Differential Lock Switch

         Lock switch is located on lower center of instrument panel,

below radio.

         Rear Differential Lock Detection Switch

         Lock detection switch is located on rear differential

carrier.

         TROUBLE SHOOTING

         INDICATOR LIGHT FLASHES WHEN LOCK SWITCH IS TURNED ON

         If vehicle speed is greater than 7 MPH, reduce speed to less

than 3 MPH. If vehicle speed is less than 7 MPH, rotate steering wheel

to right and left to reset light.

         INDICATOR LIGHT FLASHES WHEN LOCK SWITCH IS TURNED OFF

         If indicator flashes after lock switch is turned off, depress

and release accelerator several times while driving straight ahead to

reset light.

         TESTING

         REAR DIFFERENTIAL LOCK AIR PUMP

         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







































































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.







































































         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.

Fig. 2:  Testing Rear Differential Lock Detection Switch

Courtesy of Mitsubishi Motor Sales of America.

         REAR DIFFERENTIAL LOCK SWITCH