Mitsubishi Montero (1991+). Manual - part 213

not present, check circuit between relay and battery, including

fusible link No. 1.

Fig. 10:  MPI Control Relay Connector Term. ID (8 Pin)

Courtesy of Mitsubishi Motor Sales of America.

         2) Disconnect wiring harness connector at relay. Remove

relay. Check continuity between terminals No. 1 and 4, terminals No. 2

and 4 and terminals No. 3 and 4. If there is no continuity, go to next

step. If there is continuity, replace relay.

         3) Check diode operation between terminals No. 6 and 8. If

there is continuity in only one direction, go to next step. If there

is no continuity in either direction or if there is continuity in both

directions, replace relay.

         4) Measure resistance between terminals No. 6 and 7. If

resistance is approximately 35 ohms, go to next step. If resistance is

not approximately 35 ohms, replace relay.

         5) Measure resistance between terminals No. 2 and 5 and

between terminals No. 3 and 5. In both tests, if resistance is

approximately 95 ohms, go to next step. If resistance is not

approximately 95 ohms, replace relay.

         6) Connect positive lead of 12-volt source to terminal No. 7

and negative lead to terminal No. 6. If there is continuity between

terminals No. 1 and 4, go to next step. If there is no continuity,

replace relay.

         7) Connect positive lead of 12-volt source to terminal No. 5

and negative lead to terminal No. 2. If there is continuity between

terminals No. 1 and 4, go to next step. If there is no continuity,

replace relay.

         8) Connect positive lead of 12-volt source to terminal No. 5

and negative lead to terminal No. 3. If there is continuity between

terminals No. 1 and 4, go to next step. If there is no continuity,

replace relay.

         9) Connect positive lead of 12-volt source to terminal No. 8

and negative lead to terminal No. 6. If there is continuity between

terminals No. 3 and 4 and between terminals No. 2 and 4, relay is

okay. If there is no continuity, replace relay.

         SOLENOIDS

         Fuel Pressure Control Solenoid Valve

         See FUEL DELIVERY under FUEL SYSTEM.

         Fuel Injector Solenoids

         See FUEL CONTROL under FUEL SYSTEM.

         FUEL SYSTEM

         FUEL DELIVERY

NOTE:    For fuel system pressure testing, see F - BASIC TESTING

         article in the ENGINE PERFORMANCE Section.

         FUEL CONTROL

         Fuel Injectors

         1) Using a stethoscope, check operating sound of injector(s)

during engine cranking or idling. If clicking sound is heard,

injectors are okay. If clicking sound is not heard at each injector,

go to step 2).

         2) Disconnect injector electrical connector. Measure

resistance between injector connector terminals. At 68



F (20



C), if

resistance is not 13-16 ohms, replace injector.

         3) If resistance is within specification, check injector

wiring circuit for open or short to ground. If wiring circuit tests

okay, replace injector.

         IDLE CONTROL SYSTEM

NOTE:    ISC motor adjusts throttle plate angle to regulate idle air

         by-pass volume.

         IDLE SPEED CONTROL (ISC) MOTOR OPERATION TEST

CAUTION:  DO NOT apply more than 6 volts to ISC motor.

         Pickup 2.4L & Ram-50 2.4L

         Connect 6-volt DC source across terminals No. 1 and 2 of ISC

motor connector. See Fig. 11. Reverse leads of 6-volt source. If motor

does not operate in both directions, replace ISC motor assembly.

Fig. 11:  ISC Motor Connector Term. ID (2 Pin)

Courtesy of Mitsubishi Motor Sales of America.

         Montero, Pickup 3.0L & Ram-50 3.0L

         1) Remove throttle body from intake plenum. Remove ISC motor

from throttle body. Apply 6-volt source parallel to terminals No. 2

and 5 of ISC motor connector. See Fig. 12.

Fig. 12:  ISC Motor Connector Term. ID (6 Pin)

Courtesy of Mitsubishi Motor Sales of America.

         2) Apply source ground lead to ISC motor connector terminals

No. 3 and 6. Note slight movement of ISC motor plunger. Remove ground

leads from terminals No. 3 and 6.

         3) Apply and remove source ground at terminals No. 1 and 6, 1

and 4, 3 and 4, and 3 and 6. Note slight movement of ISC motor plunger

during each phase of test.

         4) Beginning at terminal No. 6, reverse grounding sequence

following same procedure specified in step 2). If motor does not

operate when grounding any of specified terminals, replace ISC motor.

         IDLE SPEED CONTROL (ISC) MOTOR RESISTANCE TEST

         Pickup 2.4L & Ram-50 2.4L

         Disconnect ISC motor connector. Connect ohmmeter between

terminals No. 1 and 2 of ISC motor connector. See  Fig. 11. If

resistance is not 5-35 ohms at 68



F (20



C), replace ISC motor

assembly.

         Montero, Pickup 3.0L & Ram-50 3.0L

         Measure resistance between terminals No. 1 and 2, 2 and 3, 4

and 5, and 5 and 6 of ISC motor connector. See  Fig. 12. In each case,

if resistance is not 28-33 ohms at 68



F (20



C), replace ISC motor