check engine MITSUBISHI LANCER EVOLUTION IV 1998 Owner's Guide

MPI – Troubleshooting13-25
6-2 RESISTANCE AND CONTINUITY BETWEEN HARNESS SIDE CONNECTORS AND
TERMINALS
Engine-ECU Harness Side Connector Terminal Arrangement
Terminal No.Inspection itemNormal condition (Check condition)
1 – 12No.1 injector2 – 3 Ω (At 20C)
14 – 12No.2 injector
2 – 12No.3 injector
15 – 12No.4 injector
3 – 12Fuel pressure control valve28 – 36 Ω (At 20C)
4 – 12Stepper motor coil (A1)28 – 33 Ω (At 20C)
17 – 12Stepper motor coil (A2)
5 – 12Stepper motor coil (B1)
18 – 12Stepper motor coil (B2)
6 – 12Secondary air control solenoid valve28 – 36 Ω (At 20C)
11 – 12Wastegate solenoid valve62 – 74 Ω (At 20C)
13 – Body earthEngine-ECU earthContinuity established (0 Ω)
26 – Body earth
60 – 12Oxygen sensor heater (EVOLUTION-V
only)11 – 18 Ω (at 20C)
72 – 92Intake air temperature sensor5.3 – 6.7 kΩ (When intake air temperature is 0C)
2.3 – 3.0 kΩ (When intake air temperature is 20C)
1.0 – 1.5 kΩ (When intake air temperature is 40C)
0.30 – 0.42 kΩ (When intake air temperature is 80C)
74 – 77High temperature sensor3 Ω or less
83 – 92Engine coolant temperature sensor5.1 – 6.5 kΩ (When coolant temperature is 0C)
2.1 – 2.7 kΩ (When coolant temperature is 20C)
0.9 – 1.3 kΩ (When coolant temperature is 40C)
0.26 – 0.36 kΩ (When coolant temperature is 80C)
87 – 92Idle position switchContinuity established (when throttle valve is at idle
position)
No continuity (when throttle valve is slightly open)
91 – Body earth–Continuity established

MPI – Troubleshooting13-26
7. INSPECTION PROCEDURE USING
OSCILLOSCOPE
7-1 AIR FLOW SENSOR (AFS)
Observing waveforms displayed on the oscilloscope allows
you to visually identify possible unusual disturbances in
waveform that could temporarily occur in the air flow sensor
output.
<Measurement procedure>
(1) Disconnect the air flow sensor connector and connect
the special tool (Test Harness: MB991709) to it. (Ensure
that all terminals are connected.)
(2) Connect the oscilloscope probe to terminal no. 3 of air
flow sensor connector.
NOTE
If the engine ECU connector is used, connect the
oscilloscope probe to terminal no. 90.
(3) Perform the same steps from here on as with the 4G9
engine.
7-2 CAMSHAFT POSITION SENSOR AND CRANK
ANGLE SENSOR
Perform the same steps as with the conventional 4G9 engine
for the inspection.
7-3 INJECTOR
Observing waveforms displayed on the oscilloscope allows
you to visually check the conditions of injector drive signals
actually output from the engine ECU.
Injector Control Signal (Oscilloscope 1)
<Measurement procedure>
(1) Disconnect the injector connector and connect the special
tool (Test Harness: MB991348) to the circuit. (Ensure
that the terminals on both the power supply and engine
ECU sides are connected.)
(2) Connect the oscilloscope probe to terminal no. 2 of injector
connector.
NOTE
If the engine ECU connector is used for the measurement,
take measurements at each of the following terminals.
Connect the oscilloscope probe to terminal no. 1 when
the waveform is observed with no. 1 cylinder, to terminal
no. 14 when the waveform is observed with no. 2 cylinder,
to terminal no. 2 when the waveform is observed with
no. 3 cylinder, and to terminal no. 15 when the waveform
is observed with no. 4 cylinder.
Oscilloscope
Oscilloscope

MPI – On-vehicle Service13-32
6. INTAKE AIR TEMPERATURE SENSOR
CHECK
1. Disconnect the air flow sensor connector.
2. Measure resistance between terminals 5 and 6.
Standard value:
2.3 – 3.0 kΩ (at 20C)
0.30 – 0.42 kΩ (at 80C)
3. Measure resistance while heating the sensor using a hair
drier.
Normal condition:
Temperature (C)Resistance (kΩ)
HigherSmaller
4. If the value deviates from the standard value or the
resistance remains unchanged, replace the air flow sensor
assembly.
7. ENGINE COOLANT TEMPERATURE
SENSOR CHECK
The engine coolant temperature sensor is located as shown
on the left.
Standard value:
2.1 – 2.7 kΩ (at 20C)
0.26 – 0.36 kΩ (at 80C)
8. OXYGEN SENSOR CHECK
<EVOLUTION-IV>
The sensor connector is located as shown on the left.
<EVOLUTION-V>
(1) Disconnect the oxygen sensor connector and connect
the special tool (Test Harness: MD998464) to the oxygen
sensor connector.
Equipment sideconnector
Air flow sensor
Intake air temperature sensor
Engine coolant
temperature sensor
Oxygen sensor equipment side connector
Oxygen sensor connector
Oxygen sensor

MPI – On-vehicle Service13-33
(2) Check that there is continuity (11 to 18 Ω at 20C) across
terminal no. 1 (special tool red clip) and terminal no. 3
(special tool blue clip) of the oxygen sensor connector.
(3) If there is no continuity, replace the oxygen sensor.
(4) Run the engine until the engine coolant temperature
exceeds 80C.
(5) Using jumper wires, connect oxygen sensor terminal no.
1 (special tool red clip) and terminal no. 3 (special tool
blue clip) to battery (+) and (–) terminal, respectively.
Caution
Make sure of the correct connections: if a wrong
connection is made, a broken oxygen sensor results.
(6) Connect a digital voltmeter between terminal no. 2 (special
tool black clip) and terminal no. 4 (special tool white clip).
(7) Race the engine repeatedly to measure the oxygen sensor
output voltage.
Standard value:
EngineOxygen sensor
output voltageNOTE
When
engine is
raced0.6 – 1.0 VWhen engine racing is
repeated to enrich air-fuel
ratio, an operational oxygen
sensor should output a volt-
age of 0.6 to 1.0 V.
NOTE
Use the same procedures to remove and install the oxygen
sensor.
Red clip
Blue clip
MD998464
Red clip
Blue clip
MD998464 Black clip
White clip

MPI – On-vehicle Service13-34
9. INJECTOR CHECK
Injection Condition Check
(1) Release the residual pressure from the fuel pipe line to
prevent fuel from flowing out.
(2) Remove the injector.
(3) Set up the special tools (Injector Test Set, Adapter, Fuel
Pressure Regulator, and Clip) as illustrated below.
(4) From here on, use the same procedure as with the
conventional 4G9 engine for the check.
MD998741
MD998706 MB991607Main hose
BatteryInjectorClip: MD998746Return hose
Fuel Pressure Regulator: MD116395
10. RESISTOR CHECK
(1) Disconnect the resistor connector.
(2) Measure resistance across terminals as detailed below.
Standard value
Measurement terminalsResistance (Ω)
1 – 3
4 – 3
5 5 to 6 5 (at 20C)
5 – 3
5.5 to 6.5 (at 20C)
6 – 3
Resistor

MPI – Injector13-36
INJECTOR
REMOVAL AND INSTALLATION
Pre-removal Operation
(1) Fuel Discharge Prevention
(2) Air Hose D Removal
(Refer to GROUP15 – Intercooler.)Post-installation Operation
(1) Air Hose D Installation
(Refer to GROUP15 – Intercooler.)
(2) Fuel Leakage Check
O-ring
9 {0.9}83, 6
11
12
O-ring 10 – 13 {1.0 – 1.3}
Engine oil
1
2 3
4
5
6 78 9
10 11 12
Unit: Nm {kgf
m}
4
Removal steps
1. Injector connector
2. PCV hose connection
A3. High-pressure fuel hose connection
4. Fuel return hose connection
5. Vacuum hose connector
A6. Fuel pressure regulator7. Fuel return pipe
A8. Delivery pipe
9. Insulator
10. Insulator
AA11. Injector
12. Grommet

ENGINE COOLING – Service Specifications / Lubricant / On-vehicle Service14-2
SERVICE SPECIFICATIONS
ItemsStandard value
Thermostat valve opening temperature
CWhen open76.5 ± 1.5
When fully open90
Thermostat lift mm8.5 or more
LUBRICANT
ItemsBrandQuantity dm3 {
}
Coolant capacity (in condenser tank)MITSUBISHI GENUINE DIA QUEEN SUPER
LONG LIFE COOLANT6 {6}
ON-VEHICLE SERVICE
COOLANT REPLACEMENT
CYLINDER BLOCK DRAIN PLUG
Unit: Nm {kgfm}
Drying sealant: HELMESEAL H-1M
44 {4.5}
RADIATOR CAP VALVE OPENING PRESSURE
CHECK
On EVOLUTION-V, the radiator cap valve opening pressure
must be as shown below.
Standard value: 93 – 123 kPa {0.95 – 1.25 kgf/cm
2}
Limit: 83 kPa {0.85 kgf/cm
2}

ENGINE COOLING – Thermostat14-4
INSTALLATION SERVICE POINTS
ATHERMOSTAT INSTALLATION
(1) Install the thermostat so that the jiggle valve is facing
straight up.
Caution
Make absolutely sure that no oil is adhering to the
rubber ring of the thermostat. If the rubber ring is
damaged, replace the thermostat.
(2) When assembling the thermostat, be careful not to fold
over or scratch the rubber ring.
BRADIATOR LOWER HOSE CONNECTION
(1) Insert each hose as far as the projection of the water
inlet fitting.
(2) Align the mating marks on the radiator hose and hose
clamp, and then connect the radiator hose.
INSPECTION
THERMOSTAT CHECK
(1) Immerse the thermostat in water, and heat the water while
stirring. Check the thermostat valve opening temperature.
Standard value: 76.5 ± 1.5
C
(2) Check that the amount of valve lift is at the standard
value when the water is at the full-opening temperature.
Standard value:
Full-opening temperature: 90
C
Amount of valve lift: 8.5 mm or more
NOTE
Measure the valve height when the thermostat is fully
closed, calculate the valve lift by subtracting this
measurement from the valve height when the thermostat
is fully open.
Jiggle valve
Rubber ring
Valve lift

ENGINE COOLING – Radiator14-8
REMOVAL SERVICE POINTS
ARADIATOR UPPER HOSE / RADIATOR LOWER
HOSE DISCONNECTION
After making mating marks on the radiator hose and the hose
clamp, disconnect the radiator hose.
INSTALLATION SERVICE POINT
ARADIATOR LOWER HOSE / RADIATOR UPPER
HOSE CONNECTION
(1) Insert each hose as far as the projection of the water
inlet or outlet fitting.
(2) Align the mating marks on the radiator hose and hose
clamp, and then connect the radiator hose.
Caution
Fit the clamp on the hose at the same position as
before.
INSPECTION
1. RADIATOR FAN MOTOR CHECK
Apply the battery voltage across connector terminals 1 and
2, and terminals 3 and 4, of the radiator fan motor and check,
at that time, that the radiator fan turns.
2. POWER RELAY CONTINUITY CHECK
Battery voltageTerminal number
1345
When deenergized
When energized
Radiator fan motor relay LO

INTAKE AND EXHAUST –
Service Specifications /
Special Tool / On-vehicle Service15-2
SERVICE SPECIFICATIONS
ItemsStandard valueLimit
Turbocharger boost pressure kPa {kg/cm2}53 – 87 {0.54 – 0.89}–
Wastegate actuator activation pressure kPa {kg/cm2}Approx. 100 {1.02}–
Wastegate solenoid valve coil resistance (at 20
C) Ω62 – 74–
Air bypass valve activation pressure kPa {mmHg}Approx. 53 {400}–
Secondary air control solenoid valve coil resistance (at 20
C) Ω28 – 36–
Intake manifold and exhaust manifold mounting surface distortion
mmWithin 0.150.20
SPECIAL TOOL
ToolNumberNameApplication
MB998770Oxygen sensor
wrenchRemoval and installation of oxygen sensor
ON-VEHICLE SERVICE
1. TURBOCHARGER BOOST PRESSURE
CHECK
Caution
Carry out driving tests in a location where full-throttle
acceleration is possible with utmost safety. Two persons
should be in the vehicle during the test, the assistant
in the front passenger seat reading the pressure gauge.
(1) Disconnect the hose (black) from the boost pressure
control solenoid valve and fit the pressure gauge to this
hose.
After the hose (black) has been disconnected, fit a blank
plug to the solenoid valve nipple.
(2) Drive at full-throttle acceleration in second gear and
measure the boost pressure when the engine speed
exceeds about 3,000 r/min.
Standard value:
53 – 87 kPa {0.54 – 0.89 kg/cm
2} <EVOLUTION-IV>
59 – 84 kPa {0.61 – 0.86 kg/cm2} <EVOLUTION-V>
Wastegate
solenoid valve
Blank plug