Mitsubishi Lancer Evolution VI. Manual - part 36

 

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Mitsubishi Lancer Evolution VI. Manual - part 36

 

 

MPI  – 

Troubleshooting

13-32

INSPECTION PROCEDURE 17

The feeling of impact or vibration when decelerating

Probable cause

Malfunction of the ISC servo system is suspected.

D

Malfunction of the ISC servo system

MUT-

II

 Self-Diag code

Are diagnosis codes displayed?

Yes

Refer to P.13-8, INSPECTION CHART FOR DIAGNOSIS CODES.

No

Check the ISC servo for operation sound.

NG

Check the ISC servo system.
(Refer to P.13-44, INSPECTION PROCEDURE 33.)

OK

MUT-

II

 Data list

14 Throttle position sensor (Refer to P.13-57.)

NG

Check the throttle position sensor system. (Refer to P.13-9, IN-
SPECTION PROCEDURE FOR DIAGNOSIS CODE 14.)

OK

MUT-

II

 Data list

26 Idle position switch (Refer to P.13-58.)

NG

Check the idle position switch system.
(Refer to P.13-38, INSPECTION PROCEDURE 26.)

OK

Clean the throttle valve area.

INSPECTION PROCEDURE 18

Poor acceleration

Probable cause

Defective ignition system, abnormal air-fuel ratio, poor compression pressure, etc.
are suspected.

D

Malfunction of the ignition system

D

Malfunction of air-fuel ratio control system

D

Malfunction of the fuel supply system

D

Poor compression pressure

D

Clogged exhaust system

D

Malfunction of the turbocharger system

MUT-

II

 Self-Diag code

Are diagnosis codes displayed?

Yes

Refer to P.13-8, INSPECTION CHART FOR DIAGNOSIS CODES.

No

Check the injectors for operation sound.

NG

Check the injector system. (Refer to P.13-15, INSPECTION PRO-
CEDURE FOR DIAGNOSIS CODE 41.)

OK

Check the ignition timing. 
(Refer to GROUP 11 – Engine Adjustments.)*

NG

Check that the crank angle sensor and the timing belt cover are
installed properly.

OK

MUT-

II

: Check if hesitation, sag, stumble or poor acceleration occur.

(Refer to P.13-51, INSPECTION PROCEDURE 43.)

OK

Check the fuel pressure. (Refer to P.13-30.)*

OK

Check the following items.

D

Check the ignition coil, spark plugs, spark plug cables.

D

Check the turbocharger boost pressure.

D

Check the boost pressure control system.

D

Check the turbocharger turbine wheel for smooth rotation.

D

Check the compression pressure.

D

Check the fuel filter or fuel line for clogging.

D

Broken air intake hose

D

Clogged air cleaner

D

Clogged exhaust system

NOTE
*:

Refer to Workshop Manual for LANCER EVOLUTION-IV and EVOLUTION-V (Pub. No. S9806CNCP9).

MPI  – 

Troubleshooting

13-33

INSPECTION PROCEDURE 19

Surge

Probable cause

Defective ignition system, abnormal air-fuel ratio, etc. are suspected.

D

Malfunction of the ignition system

D

Malfunction of air-fuel ratio control system

MUT-

II

 Self-Diag code

Are diagnosis codes displayed?

Yes

Refer to P.13-8, INSPECTION CHART FOR DIAGNOSIS CODES.

No

Check the injectors for operation sound.

NG

Check the injector system. (Refer to P.13-15, INSPECTION PRO-
CEDURE FOR DIAGNOSIS CODE 41.)

OK

Check the ignition timing. 
(Refer to GROUP 11 – Engine Adjustments.)*

NG

Check that the crank angle sensor and the timing belt cover are
installed properly.

OK

MUT-

II

: Check if surge occurs. 

(Refer to P.13-52, INSPECTION PROCEDURE 44.)

OK

Check the fuel pressure. (Refer to P.13-30.)*

OK

Check the following items.

D

Check the ignition coil, spark plugs, spark plug cables.

D

Check the waste gate actuator.

NOTE
*:

Refer to Workshop Manual for LANCER EVOLUTION-IV and EVOLUTION-V (Pub. No. S9806CNCP9).

INSPECTION PROCEDURE 20

Knocking

Probable cause

In cases as the above, the cause is probably that the detonation control is defective
or the heat value of the spark plug is inappropriate.

D

Defective detonation sensor

D

Inappropriate heat value of the spark plug

MUT-

II

 Self-Diag code

Are diagnosis codes displayed?

Yes

Refer to P.13-8, INSPECTION CHART FOR DIAGNOSIS CODES.

No

Does knocking occur when driving with the sensor disconnected?

At this time, use the MUT-

II

 to check if the timing is retarded

compared to when the detonation sensor connector is con-
nected.

No

Check the detonation sensor system. (Refer to P.13-15, INSPEC-
TION PROCEDURE FOR DIAGNOSIS CODE 31.)

Yes

Check the following items.

D

Spark plugs

D

Check if foreign materials (water, alcohol, etc.) got into fuel.

INSPECTION PROCEDURE 21

Dieseling

Probable cause

Fuel leakage from injectors is suspected.

D

Fuel leakage from injectors

Check the injectors for fuel leakage.

MPI  – 

Troubleshooting

13-34

INSPECTION PROCEDURE 22

Too high CO and HC concentration when idling

Probable cause

Abnormal air-fuel ratio is suspected.

D

Malfunction of the air-fuel ratio control system

D

Deteriorated catalyst

Check trouble symptom.

No

Check the ignition timing. 
(Refer to GROUP 11 – Engine Adjustments.)*

NG

Check that the crank angle sensor and the timing belt cover are
installed properly.

OK

MUT-

II

 Data list

21 Engine coolant temperature sensor. (Refer to P.13-57.)

NG

Check the engine coolant temperature sensor system. 
(Refer to P.13-10, INSPECTION PROCEDURE FOR DIAGNOSIS
CODE 21.)

OK

MUT-

II

 Data list

13 Intake air temperature sensor (Refer to P.13-56.)

NG

Check the intake air temperature sensor system. (Refer to P.13-9,
INSPECTION PROCEDURE FOR DIAGNOSIS CODE 13.)

OK

MUT-

II

 Data list

25 Barometric pressure sensor (Refer to P.13-58.)

NG

Check the barometric pressure sensor system. (Refer to P.13-14,
INSPECTION PROCEDURE FOR DIAGNOSIS CODE 25.)

OK

MUT-

II

 Data list

11 Oxygen sensor

OK: 600– 1,000 mV when racing suddenly

NG

Check the oxygen sensor system. (Refer to P.13-15, INSPECTION
PROCEDURE FOR DIAGNOSIS CODE 31.)

OK

MUT-

II

 Data list

11 Oxygen sensor

OK: Repeat 0 – 400 mV and 600 – 1,000 mV alternately when

idling.

OK

NG

Check the fuel pressure. (Refer to P.13-30.)*

OK

NG

Check the following items.

D

Check the injectors for operation sound.

D

Check the injectors for fuel leakage.

D

Check the ignition coil, spark plugs, spark plug cables.

D

Check the compression pressure.

D

Check the positive crankcase ventilation system.

D

Check the evaporative emission control system.

Check the trouble symptom.

NG

Replace the catalytic converter.

Replace the oxygen sensor.

MUT-

II

 Self-Diag code

Are diagnosis codes displayed?

Yes

Refer to P.13-8, INSPECTION CHART FOR DIAGNOSIS CODES.

NOTE
*:

Refer to Workshop Manual for LANCER EVOLUTION-IV and EVOLUTION-V (Pub. No. S9806CNCP9).

MPI  – 

Troubleshooting

13-35

INSPECTION PROCEDURE 23

Low alternator output voltage (approx. 12.3 V)

Probable cause

The alternator may be defective, or malfunctions, which are listed in the right column,
may be suspected.

D

Malfunction of charging system

D

Short circuit in harness between alternator G terminal
and engine-ECU

D

Malfunction of engine-ECU

Measure at the alternator connector
side. A-05

D

Connect the connector.
(Test harness: MB991519)

D

Voltage between 1 (black clip) and
earth
Engine: at idle
Radiator fan: does not run
Headlamp: OFF 

 ON

Brake lamp: OFF 

 ON

Rear defogger switch: 
OFF 

 ON

OK: Voltages rises 

by 0.2 – 3.5 V.

NG

Measure at the alternator connector.
A-05

D

Disconnect the connector, and
measure at the harness side.

D

Disconnect the engine-ECU con-
nector.

D

Continuity between 1 and earth
OK: No continuity

NG

Check the harness wire between the
alternator and the engine-ECU connec-
tor, and repair if necessary.

OK

Check the alternator.

OK

Check the harness wire between the
alternator and the engine-ECU connec-
tor.

NG

Repair

OK

Replace the engine-ECU.

INSPECTION PROCEDURE 24

Power supply system and ignition switch-IG system

Probable cause

When an ignition switch ON signal is input to the engine-ECU, the engine-ECU turns
the control relay ON. This causes system voltage to be supplied to the engine-ECU,
injectors and air flow sensor.

D

Malfunction of the ignition switch

D

Malfunction of the control relay

D

Improper connector contact, open or short-circuited
harness wire

D

Disconnected engine-ECU earth wire

D

Malfunction of the engine-ECU

Check the control relay. (Refer to P.13-68.)

NG

Replace

OK

Measure at the control relay connector B-27.

D

Disconnect the connector, and measure at the harness side.

D

Voltage between 3, 4 and earth
OK: System voltage

NG

Check the following
connector:
 A-28

NG

Repair

OK

Check trouble symptom.

NG

Check the harness wire between battery and control relay connector,
and repair if necessary.

OK

Check the engine-ECU power supply and earth circuit. 
(Refer to P.13-53, INSPECTION PROCEDURE 45.)

 

 

 

 

 

 

 

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