differential MITSUBISHI MONTERO 1998 Workshop Manual

HO2S detects oxygen content in exhaust gas and sends this
information to PCM. PCM uses input signals from HO2S to vary duration
of fuel injection. HO2S heater stabilizes sensor temperature
regardless of exhaust gas temperature to allow for more accurate
exhaust oxygen content readings.
Idle Air Control (IAC) Valve Position Sensor
Sensor is incorporated in IAC motor. Sensor senses IAC motor
plunger position and sends electrical signal to PCM.
Ignition Timing Adjustment Terminal
Used for adjusting base ignition timing. When terminal is
grounded, PCM timing control function is by-passed, allowing base
timing to be adjusted.
Intake Air Temperature (IAT) Sensor
IAT sensor is incorporated into airflow sensor assembly. This
resistor-based sensor measures temperature of incoming air and
supplies air density information to PCM.
Knock Sensor (KS)
KS is located in cylinder block and senses engine vibration
during detonation (knock). KS converts vibration into electrical
signal. PCM retards ignition timing based on this signal.
Manifold Differential Pressure (MDP) Sensor
MDP sensor converts negative air pressure in intake manifold
plenum into voltage signals sent to PCM. PCM monitors Exhaust Gas
Recirculation (EGR) system using these signals.
Park/Neutral Position (PNP) Switch (Automatic Transmission)
PNP switch senses position of transmission select lever,
indicating engine load due to automatic transmission engagement. Based
on this signal, PCM commands IAC motor to increase throttle angle,
maintaining optimum idle speed.
Power Steering Oil Pressure Switch
Switch detects increase in power steering oil pressure. When
power steering oil pressure increases, switch contacts close,
signaling PCM. PCM commands IAC motor, raising idle speed to
compensate for drop in engine RPM due to power steering load.
Throttle Position (TP) Sensor
TP sensor is a variable resistor mounted on throttle body.
PCM uses voltage signal from TP sensor to determine throttle plate
angle.
Vehicle Speed Sensor (VSS)
Mounted on transaxle/transmission, VSS sends a pulsing signal
to PCM for vehicle speed calculation. PCM uses this calculation for
cruise control and fuel cut-off.
Volume Airflow (VAF) Sensor
Incorporated into airflow sensor assembly, VAF sensor
measures intake airflow rate. Intake air flows through tunnel in
airflow sensor assembly. VAF sensor sends frequency signal to PCM. PCM
uses signal to adjust fuel injection rate.
OUTPUT SIGNALS
NOTE: Vehicles are equipped with various combinations of
computer-controlled components. Not all components listed
below are used on every vehicle. To determine component

Door Lock Control Unit Behind left side of dash.
ELC 4-Speed Automatic Transmission
Control Module Behind left side of dash.
Engine Control Module (ECM) Behind right kick panel.
Keyless Entry Control Unit Behind right side quarter
panel.
Rear Differential Lock Control Unit Mounted on top of left rear
wheelwell.
SRS Air Bag Control Unit Behind center of dash.
Sun Roof Control Unit On center of roof, behind
sun roof.
Variable Shock Absorber Control Unit Behind left rear wheelwell,
behind quarter panel.
4WD Indicator Control Unit Behind center of dash.









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MOTORS









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Component Component Location








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Blower Motor Behind right side of dash.
Condenser Fan Motor On left front of engine
compartment.
Fuel Pump In fuel tank.
Headlight Washer Motor Right side of engine
compartment, in washer fluid
reservoir.
Idle Air Control Motor On throttle body.
Motor Antenna Rear of right front wheelwell.
Rear Differential Lock Air Pump On left rear of vehicle.
Rear Washer Motor In rear of cargo area.
Rear Wiper Motor On center of tailgate.
Sun Roof Motor On center of roof, behind
sun roof.
Windshield Washer Motor Bottom of windshield washer
reservoir.
Windshield Wiper Motor On left side of firewall.









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SENDING UNITS & SENSORS

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Component Component Location








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ABS Speed Sensors (4) On bracket, on each wheel hub.\
Air Inlet Sensor In evaporator air duct.
Camshaft Position Sensor At bottom of left camshaft
gear.
Crankshaft Position Sensor Above crankshaft gear.
Engine Coolant Temperature Gauge Unit On thermostat housing.
Engine Coolant Temperature Sensor On thermostat housing.
Front Impact Sensor (Left) (SRS) On left front of engine
compartment.
Front Impact Sensor (Right) (SRS) On right front of engine
compartment.
Fuel Gauge Unit In fuel tank.
Fuel Tank Differential Pressure Sensor
(Calif.) Top of fuel tank.
G-Sensor (ABS) In center console, rear of
parking brake lever.
Geomagnetic Sensor (Compass) On top center of dash.

Heated Oxygen Sensor (Front)
(Federal) Underside of vehicle, forward
of catalytic converter.
Heated Oxygen Sensor (Front)
(Left Bank) (Calif.) In left exhaust manifold.
Heated Oxygen Sensor (Front)
(Right Bank) (Calif.) In right exhaust manifold.
Heated Oxygen Sensor (Rear)
(Federal) Underside of vehicle, behind
catalytic converter.
Heated Oxygen Sensor (Rear) (Left Bank)
(Calif.) In left exhaust pipe, below
engine.
Heated Oxygen Sensor (Rear) (Right Bank)
(Calif.) In right exhaust pipe, below
engine.
Input Shaft Speed Sensor On side of transmission.
Intake Air Temperature Sensor Mounted on outside of
evaporator case.
Manifold Differential Pressure Sensor On top left rear of engine.
Output Shaft Speed Sensor On rear of transmission.

Outside Air Temperature Sensor Below left headlamp.
Park/Neutral Position Sensor On left side of transmission.
Throttle Position Sensor On throttle body.
Vehicle Speed Sensor (VSS) On transmission tailshaft.
Volume Airflow Sensor In air cleaner duct (includes
intake air temperature sensor
& barometric pressure sensor).









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SOLENOIDS & SOLENOID VALVES









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Component Component Location








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ABS Hydraulic Unit (w/Built-In
Solenoid Valve) In right rear corner of engine
compartment.
Cruise Control Actuator (w/Built-In
Control Valve & Release Valve)
(Calif.) In right rear of engine
compartment.
Cruise Control Actuator (w/Built-In
Control Valve & Release Valve)
(Federal) In left rear of engine
compartment.
EGR Solenoid In right rear of engine
compartment.
ELC 4-Speed Automatic Transmission
Control Solenoid Inside transmission.
Evaporative Emission Purge Solenoid On front of engine.
Evaporative Emission Ventilation
Solenoid In left rear of engine
compartment.
Solenoid Valves "A" & "B" In right side of engine
compartment.









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SWITCHES









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Component Component Location








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A/T Fluid Temperature Switch On left side of transmission.
Brake Fluid Level Switch In brake master cylinder
reservoir.
Center Differential Lock Detection
Switch On transfer case.

Center Differential Lock Operation
Detection Switch On transfer case.
Dual Pressure Switch On high pressure line, on
receiver-drier.
Engine Coolant Temperature Switch Top right front of engine.
Free Wheel Engage Switch Right side of engine
compartment.
High Range/Low Range Detection Switch On transfer case.
Low Range Operation Detection Switch On transfer case.
Oil Pressure Switch Lower left front of engine.
Parking Brake Switch At base of parking brake
lever.
Power Steering Pressure Switch On power steering pump.
Rear Differential Lock Detection
Switch Under rear of vehicle, on
differential.
Reed Switch Integral with speedometer.
Seat Belt Switch On driver-side seat belt
buckle.
Stoplight Switch On bracket, above brake pedal.
2WD/4WD Detection Switch On transfer case.
4WD Operation Detection Switch On transfer case.









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MISCELLANEOUS









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Component Component Location








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Amplifier Under center console, below
floor.
Data Link Connector (DLC) Behind left side of dash,
near relay box.

than .010" (.25 mm) from tip. Chamfer sharp edge of reground valve
tip. Recheck valve stem installed height.
VALVE STEM OIL SEALS
Valve stem oil seals must be installed on valve stem. See
Fig. 2 . Seals are needed due to pressure differential at the ends of
valve guides. Atmospheric pressure above intake guide, combined with
manifold vacuum below guide, causes oil to be drawn into the cylinder.
Exhaust guides also have pressure differential created by
exhaust gas flowing past the guide, creating a low pressure area. This
low pressure area draws oil into the exhaust system.
Replacement (On Vehicle)
Mark rocker arm or overhead cam components for location.
Remove rocker arm components or overhead cam components. Components
must be installed in original location. Remove spark plugs. Valve stem
oil seals may be replaced by holding valves against seats using air
pressure.
Air pressure must be installed in cylinder using an adapter
for spark plug hole. An adapter can be constructed by welding air hose
connection to spark plug body with porcelain removed.
Install adapter in spark plug hole. Apply a minimum of 140
psi (9.8 kg/cm
) to adapter. Air pressure should hold valve closed. If
air pressure does not hold valve closed, check for damaged or bent
valve. Cylinder head must be removed for service.
Using valve spring compressor, compress valve springs. Remove
valve locks. Carefully release spring compressor. Remove retainer or
rotator and valve spring. Remove valve stem oil seal.
If oversized valves have been installed, oversized oil seals
must be used. Coat valve stem with engine oil. Install protective
sleeve over end of valve stem. Install new oil seal over valve stem
and seat on valve guide. Remove protective sleeve. Install spring
seat, valve spring and retainer or rotator. Compress spring and
install valve locks. Remove spring compressor. Ensure valve locks
are fully seated.
Install rocker arms or overhead cam components. Tighten all
bolts to specification. Adjust valves if required. Remove adapter.
Install spark plugs, valve cover and gasket.
VALVE SPRING INSTALLED HEIGHT
Valve spring installed height should be checked during
reassembly. Measure height from lower edge of valve spring to the
upper edge. DO NOT include valve spring seat or retainer. Distance
must be within specifications. If valves and/or seats have been
ground, a valve spring shim may be required to correct spring height.
See Fig. 12 .
Fig. 12: Measuring Valve Spring Installed Height - Typical
This Graphic For General Information Only

DTC P0303
Cylinder No. 3 misfire detected. Possible causes are:
connector or harness, faulty ignition coil, ignition power transistor,
spark plug, ignition circuit, injector, HO2S, compression pressure,
timing belt, air intake system, fuel pressure, or CKP sensor.
DTC P0304
Cylinder No. 4 misfire detected. Possible causes are:
connector or harness, faulty ignition coil, ignition power transistor,
spark plug, ignition circuit, injector, HO2S, compression pressure,
timing belt, air intake system, fuel pressure, or CKP sensor.
DTC P0305
Cylinder No. 5 misfire detected. Possible causes are:
connector or harness, faulty ignition coil, ignition power transistor,
spark plug, ignition circuit, injector, HO2S, compression pressure,
timing belt, air intake system, fuel pressure, or CKP sensor.
DTC P0306
Cylinder No. 6 misfire detected. Possible causes are:
connector or harness, faulty ignition coil, ignition power transistor,
spark plug, ignition circuit, injector, HO2S, compression pressure,
timing belt, air intake system, fuel pressure, or CKP sensor.
DTC P0325
Knock Sensor (KS) circuit failure. Possible causes are:
connector or harness, or faulty KS.
DTC P0335
Crankshaft Position (CKP) sensor circuit failure. Possible
causes are: connector or harness, or faulty CKP sensor.
DTC P0340
Camshaft Position (CMP) sensor circuit failure. Possible
causes are: connector or harness, or faulty CMP sensor.
DTC P0400
Exhaust Gas Recirculation (EGR) flow failure. Possible causes\
are: connector or harness, faulty EGR valve, EGR solenoid, EGR valve
control vacuum, or manifold differential pressure sensor.
DTC P0403
Exhaust Gas Recirculation (EGR) solenoid failure. Possible
causes are: connector or harness, or faulty EGR solenoid.
DTC P0420
Catalyst efficiency below threshold. Possible causes are:
cracked exhaust manifold, or faulty catalytic converter.
DTC P0421
Warm-up catalyst efficiency below threshold (bank 1).
Possible causes are: faulty exhaust manifold. If exhaust manifold is
okay, replace catalytic converter.
DTC P0431
Warm-up catalyst efficiency below threshold (bank 2).
Possible causes are: faulty exhaust manifold. If exhaust manifold is
okay, replace catalytic converter.
DTC P0442
Evaporative (EVAP) emission control system leak detected.
Possible causes are: connector or harness, faulty EVAP purge solenoid,

purge control valve, or vacuum hose routing.
DTC P0443
Evaporative (EVAP) purge control valve circuit failure.
Possible causes are: connector or harness, or faulty EVAP solenoid.
DTC P0446
Evaporative (EVAP) emission control system vent control
failure. Possible causes are: connector or harness, faulty EVAP vent
solenoid.
DTC P0450
Evaporative (EVAP) emission control system pressure sensor
failure. Possible causes are: connector or harness, or faulty fuel
tank differential pressure sensor.
DTC P0455
Evaporative (EVAP) emission control system large leak
detected. Possible causes are: connector or harness, faulty EVAP purge
solenoid, purge control valve, or vacuum hose routing.
DTC P0500
Vehicle Speed Sensor (VSS) failure. Possible causes are:
connector or harness, or faulty VSS.
DTC P0505
Idle Air Control (IAC) system failure. Possible causes are:
connector or harness, or faulty IAC motor.
DTC P0510
Closed Throttle Position (TP) switch failure. Possible causes\
are: connector or harness, or faulty closed TP switch.
DTC P0551
Power Steering Pressure (PSP) sensor failure. Possible causes\
are: connector or harness, or faulty PSP sensor.
DTC P0705
Automatic transaxle/transmission range sensor circuit
failure. Possible causes are: connector or harness, or faulty PNP
switch.
DTC P0710
Automatic transaxle/transmission fluid sensor failure.
Possible causes are: connector or harness, or faulty
transaxle/transmission sensor.
DTC P0715
Automatic transaxle input/turbine speed sensor circuit
failure. Possible causes are: connector or harness, or pulse
generator.
DTC P0720
Automatic transaxle input/turbine speed sensor circuit
failure. Possible causes are: connector or harness, or pulse
generator.
DTC P0725
Engine speed input circuit failure. Possible causes are:
connector or harness.
DTC P0740
Torque converter clutch system failure. Possible causes are:

connector or harness, or torque converter clutch solenoid.
DTC P0750
Shift solenoid "A" failure. Possible causes are: connector or
harness, or low-reverse solenoid.
DTC P0755
Shift solenoid "B" failure. Possible causes are: connector or
harness, or underdrive solenoid.
DTC P0760
Shift solenoid "C" failure. Possible causes are: connector or
harness, or second solenoid.
DTC P0765
Shift solenoid "D" failure. Possible causes are: connector or
harness, or overdrive solenoid.
DTC P1103
Turbocharger wastegate actuator failure. Possible causes are:
connector or harness, faulty wastegate solenoid or actuator, or vacuum
hose routing.
DTC P1104
Turbocharger wastegate solenoid failure. Possible causes are:
connector or harness, or faulty wastegate solenoid.
DTC P1105
Fuel pressure solenoid failure. Possible causes are:
connector or harness, or faulty fuel pressure solenoid.
DTC P1400
Manifold Differential Pressure (MDP) sensor circuit failure.
Possible causes are: connector or harness, or faulty MDP sensor.
DTC P1500
Generator FR terminal circuit failure. Possible causes are:
connector or harness.
DTC P1600
Serial communication link failure. Possible causes are:
connector or harness.
DTC P1715
Pulse Generator (PG) failure. Possible causes are: connector
or harness, or faulty PG.
DTC P1750
Solenoid failure. Possible causes are: connector or harness,
faulty converter clutch solenoid, shift control solenoid, or pressure
control solenoid.
DTC P0751
Automatic transaxle control relay failure. Possible causes
are: connector or harness, or automatic transaxle relay.
DTC P1791
Engine coolant temperature level input circuit (to TCM)
failure. Possible causes are: connector or harness.
DTC P1795
Throttle position input circuit failure. Possible causes are:
connector or harness.