Mitsubishi Lancer Evolution VI. Manual - part 29

MPI  – 

Service Specifications / Sealant

13-4

SERVICE SPECIFICATIONS

Items

Specifications

Basic ignition timing 

_

BTDC

5 

±

 3

Basic idle speed rpm

850 

±

 50

Throttle position sensor adjusting voltage mV

400 – 1,000

Throttle position sensor resistance k

Ω

3.5 – 6.5

ISC servo coil resistance (at 20

_

C) 

Ω

28 – 33

Intake air temperature sensor resistance k

Ω

At 20

_

C

2.3 – 3.0

At 80

_

C

0.30 – 0.42

Coolant temperature sensor resistance k

Ω

At 20

_

C

2.1 – 2.7

At 80

_

C

0.26 – 0.36

Fuel pressure kPa

When vacuum hose is connected

230

When vacuum hose is disconnected

289 – 309

Injector coil resistance 

Ω

2 – 3

Amount of injector fuel leak  drop/min

1 or less

Oxygen sensor output voltage V

0.6 – 1.0

Fuel pressure control valve coil resistance (at 20

_

C) 

Ω

28 – 36

SEALANT

Item

Specified sealant

Remark

Engine coolant temperature sensor 
threaded portion

3M Nut Locking Part No.4171 or equivalent

Drying sealant

MPI  – 

Special Tools

13-5

SPECIAL TOOLS

Tool

Number

Name

Use

MB991502

MUT-

II

 sub 

assembly

MPI system inspection

MB991348

Test harness set

D

Measurement of voltage during trouble-
shooting

D

Inspection using an oscilloscope

MB991519

Alternator harness
connector

Measurement of voltage during
troubleshooting

MD998478

Test harness 
(3-pin, triangle)

D

Measurement of voltage during trouble-
shooting

D

Inspection using an oscilloscope

Red harness

White harness

MB991223

Inspection test
harness set

D

Pin contact
pressure
inspection
harness

D

Market tester
contact probe
(for general
connectors)

Measurement of terminal voltage

MB991529

Diagnostic trouble
code check har-
ness

Reading of diagnosis codes

MB991709

Test harness

D

Measurement of voltage during trouble-
shooting

D

Inspection using an oscilloscope

MPI  – 

Troubleshooting

13-6

TROUBLESHOOTING

DIAGNOSIS TROUBLESHOOTING FLOW

Refer to GROUP 00 – How to Use Troubleshooting/Inspection
Service Points.

DIAGNOSIS FUNCTION

ENGINE WARNING LAMP (CHECK ENGINE LAMP)

If an abnormality occurs in any of the following items related
to the Multipoint Fuel Injection (MPI) system, the engine
warning lamp will illuminate.
If the lamp remains illuminated or if the lamp illuminates while
the engine is running, check the diagnosis code output.

Engine warning lamp inspection items

Engine-ECU

Air flow sensor

Intake air temperature sensor

Throttle position sensor

Engine coolant temperature sensor

Crank angle sensor

Camshaft position sensor

Barometric pressure sensor

Detonation sensor

Injector

Ignition coil, power transister unit

METHOD OF READING AND ERASING DIAGNOSIS
CODES

Refer to GROUP 00 – How to Use Troubleshooting/Inspection
Service Points.

INSPECTION USING MUT-

II

 DATA LIST AND

ACTUATOR TESTING

1.

Carry out inspection by connecting the MUT-

II

.

If there is an abnormality, check and repair the chassis
harnesses and components.

2.

After repairing, check that the abnormal input and output
have returned to normal as a result of the repairs.

3.

Erase the diagnosis code memory.

4.

Remove the MUT-

II

 and carry out a road test to confirm

that the problem has disappeared.

Engine warning lamp
(check engine lamp)

MPI  – 

Troubleshooting

13-7

FAIL-SAFE FUNCTION REFERENCE TABLE

When the main sensor malfunctions are detected by the diagnosis function, the vehicle is controlled
by means of the pre-set control logic to maintain safe conditions for driving.

Malfunctioning item

Control contents during malfunction

Air flow sensor

1.

Uses the throttle position sensor signal and engine speed signal (crank angle sensor
signal) to take reading of the basic injector drive time and basic ignition timing from
the pre-set mapping.

2.

Fixes the ISC servo in the appointed position so idle control is not performed.

Intake air temperature
sensor

Controls as if the intake air temperature is 25

_

C.

Throttle position 
sensor

No increase in fuel injection amount during acceleration due to the throttle position sensor
signal.

Engine coolant 
temperature sensor

1.

Controls as if the engine coolant temperature is 80

_

C. 

(This condition is maintained until the ignition switch is turned off even when the
sensor signal returns normal.)

2.

Lets the fan motor (radiator and condenser) run at high speed.

Camshaft position 
sensor

Injects fuel to all cylinders simultaneously for 4 seconds.
(However, after the ignition switch is turned to ON, the No. 1 cylinder top dead centre is not
detected at all.)

Barometric pressure 
sensor

Controls as if the barometric pressure is 101 kPa.

Detonation sensor

Switches the ignition timing from ignition timing for super petrol to ignition timing for standard
petrol.

Ignition coil, power
transistor unit

Cuts off the fuel supply to cylinders with an abnormal ignition.

Alternator FR terminal

Does not control the output of the alternator according to an electrical load. (works as a
normal alternator)