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)