1998 MITSUBISHI LANCER EVOLUTION IV check engine

INTAKE AND EXHAUST – On-vehicle Service15-3
(3) If the boost pressure is lower than the standard value,
check for following which are probably the cause:
Wastegate actuator inoperative
Boost pressure leak
Turbocharger defective
(4) If the boost pressure is higher than the standard value,
boost pressure control is probably faulty. Make the
following checks:
Wastegate actuator inoperative
Wastegate valve inoperative
Wastegate actuator rubber hose disconnected or
cracked
2. BOOST PRESSURE CONTROL SYSTEM
CHECK
(1) Disconnect the hose (black) from the wastegate solenoid
valve and connect a three-way joint between the hose
and solenoid valve.
(2) Connect a hand vacuum pump to the three-way joint.
(3) Disconnect the hose (black) from the intake pipe nipple
connected to the turbocharger compressor housing and
fit a blank plug to this nipple.
(4) Disconnect the negative cable from the battery, keep it
disconnected for 10 sec. or more, and then reconnect
it back again.
(5) Block and unblock the end of the vacuum hose (black)
with a finger to apply vacuum and check for the vacuum
condition.
Engine conditionHose (black) endNormally
Stationary
(ignition switch: ON)
UnblockedVacuum leaks.
(ignition switch: ON)
BlockedVacuum retained.
Idling after warmupVacuum leaks.
NOTE
If the vacuum condition is faulty, the wastegate actuator,
wastegate solenoid valve, or hose is probably defective.
Wastegate
solenoid valve

INTAKE AND EXHAUST – On-vehicle Service15-5
6. SECONDARY AIR CONTROL SYSTEM
CHECK
(1) Start the engine and let it run at idle speed.
(2) Short-circuit the no. 6 terminal of the engine ECU
connector using a jumper wire and check at this time
that the secondary air valve lifts.
At this time, the engine ECU connector should be
connected.
7. SECONDARY AIR CONTROL SOLENOID
VALVE CHECK
7-1 OPERATION CHECK
(1) Disconnect the vacuum hose (white stripe, yellow stripe)
from the solenoid valve.
(2) Disconnect the harness connector.
(3) Connect a hand vacuum pump to nipple A of the solenoid
valve.
(4) Using jumper wires, connect the solenoid valve terminal
to battery terminals.
(5) Disconnecting and reconnecting the jumper wire on the
(–) terminal side, apply vacuum to check for airtightness.
Jumper wireNipple B conditionNormally
ConnectedOpenVacuum leaks.
PluggedVacuum retained.
DisconnectedOpenVacuum leaks.
7-2 COIL RESISTANCE CHECK
Measure the resistance across solenoid valve terminals.
Standard value: 28 – 36 Ω (at 20
C)
Secondary air control
solenoid valve
Battery

INTAKE AND EXHAUST – Intake Manifold15-10
REMOVAL SERVICE POINT
ADELIVERY PIPE, INJECTOR AND PRESSURE
REGULATOR REMOVAL
Remove the delivery pipe with the injectors and pressure
regulator attached to it.
Caution
Care must be taken, when removing the delivery pipe,
not to drop the injector.
INSTALLATION SERVICE POINT
AHIGH-PRESSURE FUEL HOSE INSTALLATION
(1) When connecting the high-pressure fuel hose to the
delivery pipe, apply a small amount of new engine oil
to the O-ring and then insert the high-pressure fuel hose,
being careful not to damage the O-ring.
Caution
Be careful not to let any engine oil get into the delivery
pipe.
(2) Check to be sure that the high pressure hose turns
smoothly.
If it does not turn smoothly, the O-ring may be trapped.
Remove the high-pressure fuel hose to check for damaged
O-ring and then re-insert it into the delivery pipe and
check once again.
(3) Tighten the mounting bolts to the specification.
INSPECTION
INTAKE MANIFOLD CHECK
(1) Check the intake manifold for damage or cracking and
replace it if defective.
(2) Using a straight edge and feeler gauge, check for distortion
of the cylinder head installation surface.
Standard value: 0.15 mm or less
Limit: 0.2 mm
High-pressure
fuel hoseDelivery pipe
O-ring

INTAKE AND EXHAUST – Exhaust Manifold and Turbocharger15-13
COIL RETURN PIPE GASKET INSTALLATION
Install the gasket so that its print part is on the oil pan side.
INSPECTION
1. TURBOCHARGER CHECK
(1) Visually check the turbine wheel and compressor wheel
for damage and cracking.
(2) Check that the turbine wheel and compressor wheel can
be turned manually with a light force.
(3) Check that there is no oil leak from the turbocharger.
(4) Check to see if the wastegate valve remains open. If
any of these faulty symptoms is evident, disassemble
the turbocharger and replace the defective part.
NOTE
For the disassembly procedure, refer to ENGINE
WORKSHOP MANUAL.
2. EXHAUST MANIFOLD CHECK
(1) Check the exhaust manifold for damage and cracking
and replace it as necessary.
(2) Using a straightedge and feeler gauge, check the cylinder
head mounting surface for distortion and replace as
necessary.
Standard value: Within 0.15 mm
Limit: 0.2 mm
Print
Gasket
Compressor wheel

16-1
ENGINE
ELECTRICAL
CONTENTS
CHARGING SYSTEM 2. . . . . . . . . . . . . . . .
ALTERNATOR 2. . . . . . . . . . . . . . . . . . . . . . . . . . .
IGNITION SYSTEM 4. . . . . . . . . . . . . . . . . .
ON-VEHICLE SERVICE 4. . . . . . . . . . . . . . . . . . .
1. Ignition Coil with Built-in Power Transistor
Check 4. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
2. Spark Plug Check, Cleaning, and
Replacement 4. . . . . . . . . . . . . . . . . . . . . . . . . .
CAMSHAFT POSITION SENSOR AND
CRANK ANGLE SENSOR
5 . . . . . . . . . . . . .

ENGINE ELECTRICAL – Ignition System16-4
IGNITION SYSTEM
ON-VEHICLE SERVICE
1. IGNITION COIL WITH BUILT-IN POWER TRANSISTOR CHECK
Secondary coil resistance measurement
Standard value: 15 – 21 kΩ
2. SPARK PLUG CHECK, CLEANING, AND REPLACEMENT
Check the plug gap and replace if the limit is exceeded.
Caution
(1) Do not attempt to adjust the gap of the platinum plug.
(2) Cleaning the platinum plug can damage platinum tips. If a cleaning is needed, use a plug
cleaner and finish cleaning within 20 seconds to protect the electrodes. Never use wire brushes.
Standard values and limits:
ManufacturerModelStandard value (mm)Limit (mm)
NGKPGR7A0.7 – 0.80.95
DENSOP22PR80.7 – 0.80.95

ENGINE EMISSION CONTROL –
Engine Control System /
Emission Control System 17-2
ENGINE CONTROL SYSTEM
SERVICE SPECIFICATIONS
ItemsStandard value
Idle speed rpm850 ± 50
EMISSION CONTROL SYSTEM
ON-VEHICLE SERVICE
SYSTEM CONFIGURATION DIAGRAM
Canister
Check
valve
Throttle body
Fuel pressure control
valve
Fuel pressure regulator
PCV valve
AirInjector
High temperature sensor*
*: EVOLUTION-IV only

ENGINE EMISSION CONTROL – Emission Control System 17-3
VACUUM HOSE PIPING CIRCUIT DIAGRAM
Fuel pressure
control valve
Surge tank
Secondary air
control solenoid
valveBlue White
Canister
Check
valve
Throttle body
Fuel
pressure
regulatorWastegate
solenoid
valve
Secondary
air valve
Bypass
valve
Front of vehicle
Wastegate
actuator Vacuum hose color
B: Black
L: Blue
R: Red
W: White
Y: Yellow
CANISTER
REMOVAL AND INSTALLATION
Pre-removal and Post-installation Operation

Air Cleaner Removal and Installation
2
1
3
4
Removal steps
1. Vapor hose
2. Purge hose
3. Canister
4. Canister bracket