Mitsubishi Montero (1991+). Manual - part 214

assembly.

         IDLE-UP SYSTEMS

         Power Steering Idle-Up System Test

         1) Disconnect pressure hose from power steering pump. Connect

in-line a pressure gauge and hoses capable of handling 300 psi (21

kg/cm



). Also connect a shut-off valve in-line with pressure gauge.

See Fig. 13.

Fig. 13:  Connecting Pressure Gauge Shutoff Valve Assembly

Courtesy of Mitsubishi Motor Sales of America.

         2) Bleed air from system by disabling ignition system and

cranking engine while turning steering wheel completely from left to

right several times. Start engine, and turn steering wheel back and

forth to raise fluid temperature to approximately 122-140



F (50-60



C).

         3) With engine idling, gradually close shutoff valve of

pressure gauge to increase hydraulic pressure. If idle speed does not

increase 200-250 RPM when fluid pressure reaches 213-284 psi (15-20

kg/cm



), replace power steering idle-up switch.

         4) Gradually open shutoff valve. If engine speed does not

return to curb idle speed between 100-142 psi (7-10 kg/cm



), replace

power steering idle-up switch. Remove testing equipment. Bleed air

from system as in step 2).

         IGNITION SYSTEM

NOTE:    For basic ignition checks, see F - BASIC TESTING article in

         ENGINE PERFORMANCE Section.

         TIMING CONTROL SYSTEMS

         Crank Angle Sensor

         Crank angle sensor is located inside distributor on SOHC

engines and is attached to cylinder head on DOHC engines. If

malfunction occurs, Code 22 will set. For testing procedure, see

appropriate G - TESTS W/CODES article in the ENGINE PERFORMANCE

Section.

         EMISSION SYSTEMS & SUB-SYSTEMS

         EXHAUST GAS RECIRCULATION (EGR)

         System Testing (Federal)

         1) Disconnect Green-striped hose from throttle body, and

connect vacuum pump to hose end. Plug nipple where hose was connected

to throttle body. When engine is cold, 122



F (50



C) or less, and at

idle, apply vacuum to disconnected hose. If idle does not change and

vacuum bleeds down, system is okay.

         2) When engine is hot, 205



F (95



C), and at idle, apply 1.8

in. Hg. If idle does not change and vacuum holds, system is okay.

Using a vacuum pump, apply 7.7 in. Hg. If idle becomes unstable or

engine stalls (and vacuum holds), system is okay.

         System Testing (California)

         1) Connect vacuum "T" fitting into Green-striped hose from

EGR valve, and connect vacuum gauge to vacuum tee. When engine coolant

temperature is 68



F (20



C) or less and engine is idling, snap throttle

open to race engine. If no change in vacuum reading is detected on

gauge, system is okay.

         2) When engine coolant temperature is 158



F (70



C) or more

and engine is idling, snap throttle open to race engine. If vacuum

increases to 3.9 in. Hg or higher, system is okay.

         3) Using vacuum pump, apply specified vacuum to open EGR

valve. See EGR VALVE SPECIFICATIONS table. If idle becomes unstable or

engine stalls, system is okay.

         EGR Control Solenoid Valve (Pickup & Ram-50, California)

         1) EGR control solenoid valve is located near left shock

tower. Label and disconnect vacuum hoses and wiring harness from

solenoid valve.

         2) Connect hand vacuum pump to vacuum nipple where Green-

striped vacuum hose was connected. Apply vacuum and ensure vacuum does

not hold. Apply battery voltage to one terminal of solenoid, and

ground other. Ensure vacuum holds.

         3) Using an ohmmeter, measure resistance between terminals of

solenoid valve. At room temperature, reading should be 36-44 ohms.

Replace solenoid if not to specification.

NOTE:    EGR temperature sensor only determines if EGR is operating.

         An inoperative sensor will not affect driveability or

         exhaust emissions.

         EGR Temperature Sensor (California)

         1) Remove EGR temperature sensor from EGR valve. Place EGR

temperature sensor in water. While increasing water temperature,

measure resistance between wire terminals.

         2) At a temperature of 122



F (50



C), resistance should be 60,

000-80,000 ohms. At 212



F (100



C), resistance should be 11,000-14,000

ohms. Replace EGR temperature sensor if resistance differs

significantly from specifications.

         EGR Valve

         1) Remove EGR valve. Check valve for sticking, carbon

deposits and damage. Clean valve with solvent if necessary. Apply 19.8

in. Hg to valve diaphragm. If valve does not hold vacuum, replace

valve.

         2) Apply specified vacuum to valve diaphragm. See CLOSED IN.

HG in EGR VALVE SPECIFICATIONS table. If valve begins to open below

specification, replace valve.

         3) Apply specified vacuum to valve diaphragm. See OPEN IN. HG

in EGR VALVE SPECIFICATIONS table. If valve is not completely open at

or above specification, replace valve.

EGR VALVE SPECIFICATIONS TABLE

Application                     Closed             Open

                                In. Hg           In. Hg

Montero  .......................  2.4  ...........  6.7

Pickup & Ram-50  ...............  1.2  ...........  9.4

         FUEL EVAPORATION

         System Test

         1) Disconnect Red-striped purge hose from throttle body, and

connect to hand vacuum pump. Plug nipple on throttle body where purge

hose was removed.

         2) With engine coolant temperature at 140



F (60



C) or less

and engine idling, apply 14.8 in. Hg. Vacuum should hold. Raise engine

speed to 3000 RPM and again apply 14.8 in. Hg. Vacuum should hold.

         3) With engine coolant temperature at 158



F (70



C) or more

and engine idling, apply 14.8 in. Hg. Vacuum should hold. Turn engine

off. Start engine and within 3 minutes of starting engine, apply

vacuum. Vacuum should bleed down.

         4) With engine running for more than 3 minutes after

starting, raise engine speed to 3000 RPM and apply 14.8 in. Hg. Vacuum

should hold momentarily and then bleed down.

NOTE:    In step 4), vacuum should bleed down continuously if vehicle

         is at an altitude of 7200 ft. (2200 m) or higher or if

         intake air temperature is 122



F (50



C) or higher.

         Purge Control Solenoid Valve

         1) Purge control solenoid valve is located near left shock

tower. Label and disconnect both vacuum hoses from solenoid valve.

Disconnect electrical connector. Connect hand vacuum pump to solenoid

valve nipple where Red-striped hose was connected. Apply vacuum to

solenoid valve. Vacuum should hold.

         2) Apply battery voltage to terminals of solenoid valve.

Vacuum should bleed down when voltage is applied to terminals. Using

an ohmmeter, check resistance across solenoid valve terminals. Reading

should be 36-44 ohms at 68



F (20



C). If reading is not within

specification, replace valve.

         POSITIVE CRANKCASE VENTILATION (PCV)

         PCV Valve

         Remove PCV valve, and insert thin screwdriver into threaded

end of valve to ensure plunger moves.