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)
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
NG
OK
OK
OK
OK
OK
OK
Repair
NG
OK
NG
NG
NG
NG
NG
NG
OK
OK
NG
NG
NG
OK
OK
NG
OK
Repair
Repair
Repair
Repair
Repair
Repair
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)
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
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.4 injector malfunction
• No.4 injector circuit broken, has short circuit, or poor
connector contact
• Engine ECU malfunction
NG
OK
NG
NG
NG
NG
NG
NG
NG
OK
NG
OK
OK
OK
OK
OK
OK
OK
Repair
OK
NG
NG
NG
OK
OK
Repair
Repair
Repair
Repair
Repair
Repair
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
OK
NG
Repair
Repair
Repair
Repair
Repair
OK
NG
NG
NG
NG
(1) NG
(2) NG
(3) NG
OK
OK
OK
OK
NG
NG
OK
NG
NG
OK
OK
NG
NG
OK
OK
OK
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
OK
NG
NG
OK
OK
NG
Repair
Repair
OK
NG
NG
NG
NG
OK
OK
OK
OK
OK
NG
NG
Repair
Repair
Repair
Finish
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