Mitsubishi Lancer Evolution 8. Manual — part 158
MPI – TROUBLESHOOTING
13A-18
Check connector B-25
B-25 O2 sensor connector
measurements
• Undo connector, and take
measurement on sensor side
• Resistance across 1 - 3
OK: 11 ~ 18
Ω
B-25 O2 sensor connector
measurement
• Undo connector, then take
harness measurement
• Ignition switch: ON
• Voltage across 1 - earth
OK: Battery voltage
C-49 Engine ECU connector
measurements
• Measure engine ECU terminal
voltage
• Ignition switch: ON
• Voltage across 3 – earth
OK: Battery voltage
Check connector C-49
Check harness between O2
sensor and Engine control relay
• Check to see if power supply
wire is damaged
Check harness between O2
sensor and Engine ECU
• Check to see if earth wire is
damaged
Confirm fault symptoms
Replace engine ECU
Replace O2 sensor
Check connector B-19X
Check and repair harness
between O2 sensor ~ Engine
control relay
• Check to see if power supply
cable is broken or has short
circuit.
Check connector C49
Check harness between O2
sensor and Engine ECU
• Check to see if earth wire is
broken or has short circuit.
Replace engine ECU
Intermittent malfunction (ref.
Chapter 00 – Intermittent
Malfunctions)
Code No. P0135 O2 Sensor Heater System
Probable causes
Inspection Conditions
• Engine cooling water temperature approx. 20ºC or more
• O2 sensor heater ON
• Engine speed at least 50rpm
• A/C relay: OFF, Radiator Fan: OFF
• Battery voltage 11 ~ 16V
Evaluation conditions
• With O2 sensor heater current 0.2A or less, or 3.5A or more,
for 4 seconds
• O2 sensor heater malfunction
• O2 sensor heater circuit broken, short-circuit, or poor
connector contact
• Engine ECU malfunction
OK
NG
NG
NG
NG
NG
NG
NG
OK
OK
OK
OK
OK
OK
OK
NG
OK
OK
OK
NG
NG
NG
Repair
Repair
Repair
Repair
Repair
Repair
Repair
MPI – TROUBLESHOOTING
13A-19
MUT-II/III diagnosis codes
• Have any diagnosis codes other
than code no. P0170 been
output?
MUT-II/III service data
• No.12 AFS
• No.13 Intake air temp. sensor
• No.21 Water temp. sensor
• No.25 Atmospheric air pressure
sensor
(ref. P.13A-83)
<For reference>
When all service data values are
correct, proceed to OK.
If there are one or more abnormal
service data values, proceed to
NG
Check air being taken in via
intake hose and inlet manifold
Check for any exhaust gas leaks
from the exhaust manifold
Check for dirt on throttle body (in
the area of throttle valve)
MUT-II/III service data
• No.11: O2 service data
(ref. P.13A-83)
Check purge control solenoid
valve component (ref. Chapter 17
– Emission Control)
Check fuel pressure
(ref. P.13D-109) *
Replace injector
Confirm fault symptoms
Replace engine ECU
Table showing diagnosis codes
(ref. P.13A-8)
When abnormal service data
values occur, go to the checking
procedures relevant to the
particular sensor diagnosis codes
(ref. P.13A-5)
Clean throttle body (area of
throttle valve) (ref. P.13D-107)*
Check Code No.P0130: O2
Sensor System (ref. P.13A-19)
Replace purge control solenoid
Intermittent malfunction (ref.
Chapter 00 – Intermittent
Malfunctions)
* Refer to ’01 Lancer Evolution VII Workshop Manual (No.1036K02)
Code No. P0170 Fuel System Abnormality
Probable causes
Inspection Conditions
• Engine Air-fuel ratio learning
Evaluation conditions
• At least 5 second duration when injected fuel correction value is
abnormally low
or
• At least 5 second duration when injected fuel correction value is
abnormally high
• Fuel supply system malfunction
• O2 sensor malfunction
• Intake air temperature sensor malfunction
• Atmospheric air pressure sensor malfunction
• Air flow sensor malfunction
• Purge control solenoid valve malfunction
• Engine ECU malfunction
NO
OK
OK
OK
OK
OK
OK
OK
OK
YES
NG
NG
NG
NG
NG
NG
NG
Repair
Repair
MPI – TROUBLESHOOTING
13A-20
MUT-II/III actuator test
• No.01: No.1 injector
OK: Idle condition changes
Intermittent malfunction (ref.
Chapter 00 – Intermittent
Malfunctions)
Replace No.1 injector
Check connector B-29
B-29 No.1 Injector connector
measurements
• Undo connector, take
measurement at harness
• Resistance across 1 – 2
OK: 2 ~ 3
Ω
B-29 No.1 Injector connector
measurements
• Undo connector, take
measurement at harness
• Ignition switch: ON
• Voltage across 1 – earth
OK: Battery voltage
Check harness between No.1
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
Replace engine ECU
Check connector B-19X, B-129,
C-23
Check register (ref. P.13D-116) *
Check harness between No.1
injector and register (used for
injectors)
• Check if power supply cable is
broken or has short circuit
Check and repair harness
between register (used for
injectors) and engine control relay
• Check if power supply cable is
broken or has short circuit
Intermittent malfunction (ref.
Chapter 00 – Intermittent
Malfunctions)
Check harness between No.1
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 1 –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.P0201 No.1 Injector System
Probable causes
Inspection Conditions
• Engine speed: 50 ~ 1,000rpm
• 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.1 injector malfunction
• No.1 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
Repair
Repair
Repair
Repair
OK
OK
NG
NG
OK
Repair
Repair
NG
OK
MPI – TROUBLESHOOTING
13A-21
MUT-II/III actuator test
• No.02: No.2 injector
OK: Idle condition changes
Check connector B-28
B-28 No.2 Injector connector
measurements
• Undo connector, take
measurement at harness
• Resistance across 1 –2
OK: 2 ~ 3
Ω
B-28 No.2 Injector connector
measurements
• Undo connector, take
measurement at harness
• Ignition switch: ON
• Voltage across 1 – earth
OK: Battery voltage
Check harness between No.2
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 harness between No.2
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 9 – earth
OK: Output waveform should be
as explained in P.13A-92
(Instructions for checks done
using oscilloscope)
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.2
injector and register (used for
injectors)
• Check if power supply cable is
broken or has short circuit
Check register (ref. P.13D-116) *
Check connectors B-19X, B-
129, C-23
Replace No.2 injector
Replace engine ECU
Check connector C-49
* Refer to ’01 Lancer Evolution VII Workshop Manual (No.1036K02)
Code No.P0202 No.2 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.2 injector malfunction
• No.2 injector circuit broken, has short circuit, or poor
connector contact
• Engine ECU malfunction
NG
NG
NG
NG
NG
NG
NG
OK
OK
OK
OK
OK
OK
OK
OK
NG
Repair
OK
OK
OK
NG
OK
NG
NG
NG
Repair
Repair
Repair
Repair
Repair
Repair
Repair
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