Mitsubishi Montero (1998+). Manual - part 114

         WHEEL SPEED SENSORS

         See SPEED SENSORS (ELECTRONIC WHEEL AND VEHICLE) .

         WIRING HARNESSES AND CONNECTORS

WIRING HARNESS AND CONNECTOR INSPECTION

Condition                 Code                          Procedure

Application incorrect  ...  B  ..  Require repair or replacement.

Attaching hardware

 broken  .................  A  ...  Require repair or replacement

                                                     of hardware.

Attaching hardware

 missing  ................  C  ..........  Require replacement of

                                                        hardware.

Attaching hardware not

 functioning  ............  A  ..   Require repair or replacement

                                                     of hardware.

Connector broken  ........  A  ..  Require repair or replacement.

Connector (Weatherpack

 type) leaking  ..........  A  ..  Require repair or replacement.

Connector melted  ........  A  ...........  ( 1) Require repair or

                                                     replacement.

Connector missing  .......  C  ............  Require replacement.

Insulation damaged,

 conductors exposed  .....  A  ..  Require repair or replacement.

Insulation damaged,

 conductors not exposed  .  1  ............  Suggest replacement.

Open  ....................  A  ..  Require repair or replacement.

Protective shield

 (conduit) melted  .......  2  ...........  ( 1) Suggest repair or

                                                     replacement.

Protective shield

 (conduit) missing  ......  2  ..  Suggest repair or replacement.

Resistance (voltage drop)

 out of specification  ...  A  ..  Require repair or replacement.

Routed incorrectly  ......  B  .................  Require repair.

Secured incorrectly  .....  B  .................  Require repair.

Shorted  .................  A  ..  Require repair or replacement.

Terminal broken  .........  A  ..  Require repair or replacement.

Terminal burned, affecting

 performance  ............  A  ...........  ( 1) Require repair or

                                                     replacement.

Terminal burned, not

 affecting performance  ..  2  ..  Suggest repair or replacement.

Terminal corroded,

 affecting performance  ..  A  ..  Require repair or replacement.

Terminal corroded, not

 affecting performance  ..  2  ..  Suggest repair or replacement.

Terminal loose, affecting

 performance  ............  B  ..  Require repair or replacement.

Terminal loose, not

 affecting performance  ..  1  ..  Suggest repair or replacement.

Transmission connector

 leaking  ................  ..  .....  See TRANSMISSION ASSEMBLY.

Voltage drop out of

 specification  ..........  A  ..  Require repair or replacement.

(1) - Determine cause and correct prior to repair or

      replacement of part.

         YOKES AND SLIP YOKES

YOKE AND SLIP YOKE INSPECTION

Condition                 Code                          Procedure

Bearing cap bore

 distorted  ..............  A  ..  Require repair or replacement.

Bent  ....................  A  ............  Require replacement.

Bolt holes elongated  ....  A  ..  Require repair or replacement.

Bushing or seal surface

 worn, affecting

 performance  ............  A  ..  Require repair or replacement.

Leaking through soft yoke

 plug  ...................  A  ...  Require repair or replacement

                                               of soft yoke plug.

Retainer strap bent  .....  A  ..........  Require replacement of

                                                  retainer strap.

Slip yoke broken  ........  A  ............  Require replacement.

Splines worn, affecting

 performance  ............  A  ............  Require replacement.

Splines worn close

 to the end of their

 useful life  ............  1  ............  Suggest replacement.

Threads damaged  .........  A  ..  Require repair or replacement.

Threads stripped (threads

 missing)  ...............  A  ............  Require replacement.

U-bolt damaged, affecting

 performance  ............  A  .............  Require replacement

                                                      of U-bolts.

Yoke damaged, affecting

 performance  ............  A  ..  Require repair or replacement.

E - THEORY/OPERATION 

1998 Mitsubishi Montero

         1998 ENGINE PERFORMANCE

         Mitsubishi - Theory & Operation

         Diamante, Eclipse, Galant, Mirage, Montero, Montero Sport,

         3000GT

         INTRODUCTION

         This article covers basic description and operation of engine

performance-related systems and components. Read this article before

diagnosing vehicles or systems with which you are not completely

familiar.

         AIR INDUCTION SYSTEM

         NON-TURBOCHARGED ENGINES

         Mirage equipped with 1.5L engine uses a Manifold Absolute

Pressure (MAP) sensor instead of a Volume Airflow (VAF) sensor.

Filtered air is ducted to a plenum-mounted throttle body.

         All other models use same basic air induction system using a

remote air filter (with VAF sensor) connected to a plenum-mounted

throttle body.

         TURBOCHARGED ENGINES

         In addition to basic air induction system, turbocharging

system components include turbocharger(s), charge air cooler(s), air

by-pass valve(s), wastegate actuator(s), wastegate control solenoid

valve(s) and intake duct(s).

         Wastegate Control Solenoid Valve(s)

         Powertrain Control Module (PCM) energizes solenoid valve(s),

controlling bleed-off rate of turbocharger pressure by wastegate

actuator(s).

         COMPUTERIZED ENGINE CONTROLS

         Sequential Fuel Injection (SFI) is a computerized engine

control system, which controls fuel injection, ignition timing, idle

speed and emission control systems.

         POWERTRAIN CONTROL MODULE (PCM)

         PCM, also known as Engine Control Module (ECM), receives and

processes signals from input devices. Operating conditions such as

cold starting, altitude, acceleration and deceleration affect input

device signals. Based on signals received, PCM sends signals to

various components, which control fuel injection, ignition timing,

idle speed and emission control systems. For PCM location, see

PCM LOCATION table.

PCM LOCATION TABLE

Application                                                   Location

Eclipse 2.0L Non-Turbo  ..........  In Front of Left Front Strut Tower

Mirage &

 Montero Sport  ...  Behind Right Side Of Instrument Panel (Glove Box)

Montero  .....................................  Right Front Kick Panel

All Others  ...................................  Behind Center Console

NOTE:    Components are grouped into 2 categories. The first category

         covers INPUT DEVICES, which control or produce voltage

         signals monitored by Powertrain Control Module (PCM). The

         second category covers OUTPUT SIGNALS, which are components

         controlled by PCM.

         INPUT DEVICES

         Vehicles are equipped with different combinations of input

devices. Not all input devices are used on all models. To determine

input device usage on specific models, see appropriate wiring diagram

in L - WIRING DIAGRAMS article. The following are available input

devices.

         Air Conditioning Switch

         When A/C is turned on, signal is sent to PCM. With engine at

idle, PCM increases idle speed through Idle Air Control (IAC) motor.

         Airflow Sensor Assembly

         Assembly is mounted inside air cleaner, and incorporates

barometric pressure sensor, intake air temperature sensor and volume

airflow sensor.

         Barometric (BARO) Pressure Sensor

         Sensor is incorporated into airflow sensor assembly. Sensor

converts barometric pressure to electrical signal, which is sent to

PCM. PCM adjusts air/fuel ratio and ignition timing according to

altitude.

         Camshaft Position (CMP) Sensor

         On SOHC engines equipped with a distributor, CMP sensor is

located in distributor. On Eclipse (Turbo) and DOHC V6 engines, sensor

is located beside camshaft, in front of engine. On all other engines,

CMP sensor is a separate unit mounted in place of distributor. PCM

determines TDC based on pulse signals received from sensor, and then

controls MFI timing.

         Closed Throttle Position (CTP) Switch

         CTP switch is located in the Throttle Position (TP) sensor.

PCM senses whether accelerator pedal is depressed or not. High voltage

(open) or low voltage (closed) signal is input to PCM, which then

controls Idle Air Control (IAC) motor based on input signal.

         Crankshaft Position (CKP) Sensor

         CKP sensor is located in distributor on SOHC engines, except

1.5L 4-cylinder with California emissions. On DOHC 4-cylinder, DOHC V6

and 1.5L 4-cylinder engines with California emissions, CKP sensor is

located beside crankshaft, in front of engine. PCM determines

crankshaft position on pulse signals received from sensor, and then

controls MFI timing and ignition timing.

         Engine Coolant Temperature (ECT) Sensor

         ECT sensor converts coolant temperature to electrical signal

for use by PCM. PCM uses coolant temperature information to control

fuel enrichment when engine is cold.

         Heated Oxygen Sensor (HO2S)