Mitsubishi Lancer Evolution 8. Manual - part 159

MPI – TROUBLESHOOTING

13A-22

MUT-II/III actuator test
• No.03: No.3 injector
OK: Idle condition changes

Intermittent malfunction (ref.
Chapter 00 – Intermittent
Malfunctions)

Check and repair harness
between register (used for
injectors) and engine control relay
• Check if power supply cable is

broken or has short circuit

Check harness between No.3
injector and register (used for
injectors)
• Check if power supply cable is

broken or has short circuit

Check register (ref. P.13D-116) *

Check connector B-19X, B-129,
C-23

B-27 No.3 Injector connector
measurements
• Undo connector, take

measurement at harness

• Resistance across 1 – 2
OK: 2 ~ 3

Ω

B-27 No.3 Injector connector
measurements
• Undo connector, take

measurement at harness

• Ignition switch: ON
• Voltage across 1 – earth
OK: Battery voltage

Check harness between No.3
injector and register (used for
injectors)
• Check for damage to power

supply cable

Check harness between register
(used for injectors) and engine
control relay
• Check for damage to power

supply cable

Check connector C-49

Check harness between No.3
injector and engine ECU
• Check if output wire is broken,

has short circuit, or is damaged

Check connector B-27

Replace No.3 injector

Replace engine ECU

C-49 Measure signal waveform
at engine ECU connector (using
an oscilloscope)
• Engine idling
• Voltage across 24 – earth
OK: Output waveform should be
as explained in P.13A-92
(Instructions for checks done
using oscilloscope)

* Refer to ’01 Lancer Evolution VII Workshop Manual (No.1036K02)

Code No.P0203 No.3 Injector System

Probable causes

Inspection Conditions
• Engine speed: 50 ~ 1,000rpm or less
• TPS output voltage 1.15V or less
• Not during MUTII/III forced drive (actuator test)
Evaluation conditions
• Injector coil surge voltage not detected for a 2 second duration

• No.3 injector malfunction
• No.3 injector circuit broken, has short circuit, or

poor connector contact

• Engine ECU malfunction

Repair

MPI – TROUBLESHOOTING

13A-23

MUT-II/III actuator test
• No.04: No.4 injector
OK: Idle condition changes

Intermittent malfunction (ref.
Chapter 00 – Intermittent
Malfunctions)

Check and repair harness
between register (used for
injectors) and engine control relay
• Check if power supply cable is

broken or has short circuit

Check harness between No.4
injector and register (used for
injectors)
• Check if power supply cable is

broken or has short circuit

Check register (ref. P.13D-116) *

Check connector B-19X, B-129,
C-23

Check connector B-26

Replace No.4 injector

Replace engine ECU

B-26 No.4 Injector connector
measurements
• Undo connector, take

measurement at harness

• Resistance across 1 –2
OK: 2 ~ 3

Ω

B-26 No.4 Injector connector
measurements
• Undo connector, take

measurement at harness

• Ignition switch: ON
• Voltage across 1 – earth
OK: Battery voltage

Check harness between No.4
injector and register (used for
injectors)
• Check for damage to power

supply cable

Check harness between register
(used for injectors) and engine
control relay
• Check for damage to power

supply cable

Check connector C-49

Check harness between No.4
injector and engine ECU
• Check if output wire is broken,

has short circuit, or is damaged

C-49 Measure signal waveform at
engine ECU connector (using an
oscilloscope)
• Engine idling
• Voltage across 2 – earth
OK: Output waveform should be
as explained in P.13A-92
(Instructions for checks done
using oscilloscope)

* Refer to ’01 Lancer Evolution VII Workshop Manual (No.1036K02)

Code No.P0204 No.4 Injector System

Probable causes

duration

• No.4 injector malfunction
• No.4 injector circuit broken, has short circuit, or poor

connector contact

• Engine ECU malfunction

Repair

MPI – TROUBLESHOOTING

13A-24

Check spark plug cable (ref.
Chapter 16 – Ignition System)

Replace spark plug cable

Replace spark plugs

Replace ignition coil

Check connector B-17X

• Check ignition coil relay
(ref. Chapter 16 Electrical)

Check and repair harness
between ignition coil and Ignition
coil relay
• Check to see if power supply

cable has short circuit.

C-49 Engine ECU connector
measurement
• Measure engine ECU terminal

voltage

• Disconnect B-119, B-123
• Engine cranking
(1) Voltage across 11, 12 - earth
OK: 0.5 ~ 4.0V

Check connector C-49

Check and repair harness
between ignition coil and Engine
ECU
Check to see if power supply
cable is broken.

Confirm fault symptoms

Replace engine ECU

Check and repair harness
between ignition coil and body
earth
• Check for broken or damaged

earth wire

Check connector C-49

Check and repair harness
between ignition coil and Engine
ECU
Check to see if power supply
cable has short circuit.

Intermittent malfunction (ref.
Chapter 00 – Intermittent
Malfunctions)

Check spark plugs (ref. Chapter
16 – Ignition System)

Check ignition coil: B-119,
B-123

Check ignition coil (re. Chapter
16 – Ignition Systems)

To next page

B-119, B-123 Ignition coil
connector measurement
• Undo connector, then take

harness measurement

(1) Voltage across 1 - earth

(Ignition switch: ON)
OK: Battery voltage

(2) Voltage across 3 - earth

(engine cranking)
OK: 0.5 ~ 4.0V

(3) Resistance across 2 - earth

OK: 2

Ω

or less

Code No.P0300 Injection Coil (housing a power transistor) System

Probable causes

Inspection Conditions
• Engine speed: 1500 ~ 3,500rpm or less
• Volumetric efficiency 40% - 80%
• Not whilst engine is cranking
Evaluation conditions
• Detecting engine speed abnormalities caused by misfiring, using crank

angle sensor (one of the two coils is for fuel)

• Ignition coil malfunction
• Spark plug malfunction
• Spark plug cable malfunction
• Ignition primary circuit broken, has a short

circuit, or poor connector contact

• Engine ECU malfunction

Repair

(1) NG

(2) NG

(3) NG

Repair

MPI – TROUBLESHOOTING

13A-25

From previous page

Check harness between ignition
coil and ignition coil relay
• Check for damage to power

supply cable

Check harness between ignition
coil and engine ECU
• Check for damage to output

cable

Confirm fault symptoms

Replace engine ECU

Intermittent malfunction (ref.
Chapter 00 – Intermittent
Malfunctions)

Check connector B-106

B-106 Knock sensor connector measurement
• Undo connector, then take harness measurement
• Resistance across 2 – earth
OK: 2

Ω

or less

Check connector C-51

Check harness between knock sensor and engine ECU
• Check to see if output wire is broken, has short circuit,

or is damaged

Confirm fault symptoms

Replace knock sensor

Confirm fault symptoms

Replace engine ECU

Check and repair harness between knock sensor and
body earth
• Check to see if earth wire is broken or damaged

Intermittent malfunction (ref. Chapter 00 – Intermittent
Malfunctions)

Code No.P0325 Knock Sensor System

Probable causes

Inspection Conditions
• Ignition switch: ON
• Excluding a duration of 2 seconds after turning ignition to

ON position, or immediately after engine has fully started up

• Engine speed approx. 2,500rpm or more
• Volumetric efficiency at least 30%
Evaluation conditions
• For 200 continuous cycles, change in knock sensor output

voltage (knock sensor peak value for each half turn of crank
shaft) 0.06V or less

• Knock sensor malfunction
• Knock sensor circuit broken, has a short circuit, or poor

connector contact

• Engine ECU malfunction

Repair

Finish

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