Mitsubishi Lancer Evolution 8. Manual — part 155
MPI – TROUBLESHOOTING
13A-6
3. CHECKING PROCEDURES BY DIAGNOSIS CODE
MUT-II/III service data
• No.12 AFS (ref. p.13A-83)
Check connector B-08
To next page
Intermittent malfunction (ref. Chapter
00 – Intermittent Malfunctions)
C-50 Engine ECU connector
measurements
• Measure engine ECU terminal
voltage
• Ignition switch: ON
• Voltage across 61 - earth
OK: 4.9 ~ 5.1V
Check connector C-50
Check harness between AFS and
Engine ECU
• Check output wire short-circuit
MUT-II/III service data
• No.12 AFS (ref. P.13A-83)
Replace engine ECU
Check connector B-19X
Check and repair harness
between AFS and Engine control
relay
• Check to see if power supply
wire broken or short-circuit
Check connector C-49
Check harness between AFS and
Engine ECU
• Check for earth wire short-
circuit, any damage
MUT-II/III service data
• No.12 AFS (ref. P.13A-83)
Replace engine ECU
Check connector C50
Check and repair harness
between AFS ~ Engine ECU
• Check to see if output wire is
broken.
Intermittent malfunction (ref.
Chapter 00 – Intermittent
Malfunctions)
Intermittent malfunction (ref.
Chapter 00 – Intermittent
Malfunctions)
B-08 AFS connector
measurements
• Undo connector, and take
harness measurement
(1) Voltage across 3 - earth
(ignition switch: ON)
OK: 4.9 ~ 5.1V
(2) Voltage across 4 - earth
(ignition switch: ON)
OK: battery voltage
(3) Resistance across 5 - earth
OK: 2
Ω
or less
Code No. P0100 Air Flow Sensor (AFS) Checking Procedure
Probable Causes
Inspection Conditions
• Engine speed: at least 500rpm
Evaluation conditions
• Sensor output frequency to 3Hz or less for 4 seconds, or continue
at 10Hz or less
• AFS malfunction
• AFS circuit broken, short-circuit, or poor connector
contact
• Engine ECU malfunction
OK
NG
NG
(1) NG
(2) NG
(3) NG
OK
OK
Repair
NG
OK
OK
NG
OK
OK
OK
OK
OK
OK
NG
NG
NG
OK
NG
NG
NG
NG
Repair
Repair
Repair
Repair
Repair
Repair
MPI – TROUBLESHOOTING
13A-7
From previous page
B-08 AFS connector
measurement
• Using test harness (MB991709),
connect to connector, and take
measurement at pick up
harness
• Ignition switch: ON
• Voltage across 7 - earth
OK: 7 ~ 8 V
B-08 AFS connector
measurement
• Using test harness (MB991709),
connect to connector, and take
measurement at pick up
harness
• Voltage across 7 - earth
OK: Engine idling
0 ~ 1V
Engine: 3,000 rpm
6 ~ 9V
Measure output waveform at B-08
AFS connector (using an
oscilloscope)
• Using test harness (MB991709),
fit to connector, and take
measurement at pick up
harness
• Engine idling
• Voltage across 3 - earth
OK: Waveforms as for
‘Checks carried using an
oscilloscope’ are output,
and there is no noise in
output waveforms
MUT-II/III service data
• No.12 AFS (ref. P.13A-83)
Replace engine ECU
Check connector C-49
Check harness between AFS and
Engine ECU
• Check for broken reset signal
wire, any damage
Replace AFS
Check connector C-49
Check harness between AFS and
Engine ECU
• Check for broken reset signal
wire, any damage
MUT-II/III service data
• No.12 AFS (ref. P.13A-83)
Replace engine ECU
Replace AFS
Confirm fault symptoms
Check connectors: C-49, C-50,
B-19X
Check harness between AFS and
Engine ECU
• Check for damage to power
supply cable
Check and repair harness
between AFS and Engine ECU
• Check for any damage to output
wire
• Check for any damage to earth
wire
Intermittent malfunction (ref.
Chapter 00 – Intermittent
Malfunctions)
Intermittent malfunction (ref.
Chapter 00 – Intermittent
Malfunctions)
OK
OK
OK
OK
OK
NG
NG
OK
OK
OK
OK
OK
NG
NG
NG
NG
NG
OK
NG
NG
NG
OK
OK
NG
NG
Repair
Repair
Repair
Repair
Finish
Repair
Repair
MPI – TROUBLESHOOTING
13A-8
MUT-II/III service data
• No.25 AFS: Barometric pressure
sensor
(ref. p.13A-83)
Check connector B-08
To next page
Intermittent malfunction (ref.
Chapter 00 – Intermittent
Malfunctions)
C-50 Engine ECU connector
measurements
• Measure engine ECU terminal
voltage
• Ignition switch: ON
• Voltage across 42 - earth
OK: 4.9~5.1V
Check connector C-50
Check harness between AFS and
Engine ECU
• Check power supply wire short-
circuit
MUT-II/III service data
• No.25 AFS Barometric pressure
sensor (ref. P.13A-83)
Replace engine ECU
Check connector C-49
Check harness between AFS and
ECU
• Check to see if earth wire is
broken or damaged
MUT-II/III service data
• No.25 Barometric Pressure
sensor (ref. P.13A-83)
Replace engine ECU
Check connector C-50
Intermittent malfunction (ref.
Chapter 00 – Intermittent
Malfunctions)
Intermittent malfunction (ref.
Chapter 00 – Intermittent
Malfunctions)
Intermittent malfunction (ref.
Chapter 00 – Intermittent
Malfunctions)
B-08 AFS connector
measurements
• Undo connector, and take
harness measurement
(1) Voltage across 1 - earth
(ignition switch: ON)
OK: 4.9 ~ 5.1V
(2) Resistance across 5 - earth
OK: 2
Ω
or less
Code No. P0105 Barometric Pressure Sensor System
Probable causes
Inspection Conditions
• Ignition switch ON
• Excluding a 2 second period after turning ignition switch to ON position, or
immediately after engine has fully started
Evaluation conditions
• Sensor output voltage at least 4.5V (equivalent to barometric pressure of
at least 114kPa)
or
• Sensor output voltage 0.2V or less (equivalent to barometric pressure of
5kPa or less)
• Barometric pressure sensor malfunction
• Barometric pressure sensor circuit broken, short-
circuit, or poor connector contact
• Engine ECU malfunction
OK
NG
NG
NG
OK
OK
NG
NG
NG
OK
NG
NG
OK
OK
OK
NG
OK
OK
NG
(1) NG
(2) NG
OK
OK
Repair
Repair
Repair
Repair
Repair
MPI – TROUBLESHOOTING
13A-9
From previous page
Check connector C-50
MUT-II/III service data
• No.25 AFS: Barometric pressure
sensor
(ref. p.13A-83)
Replace engine ECU
Check connector C-49, C-50
Check and repair harness
between AFS and Engine ECU
• Check for damage to power
supply cable
• Check for damage to earth wire
Check connector C-50
Check harness between AFS and
Engine ECU
• Check for short-circuit or
damage to output wire
Replace AFS
Check connector C-50
Check and repair harness
between AFS and Engine ECU
• Check for short-circuit or
damage to output wire
Intermittent malfunction (ref.
Chapter 00 – Intermittent
Malfunctions)
B-08 AFS connector
measurement
• Using test harness (MB991709),
connect only to connector
terminal Nos.1,.2, and 5, and
take measurement at pick up
harness
• Ignition switch: ON
(1) Voltage across 1 - earth
OK: 4.9 ~ 5.1V
(2) Voltage across 5 - earth
OK: 0.5V or less
(3) Voltage across 2 - earth
OK: Altitude 0m 3.8 ~ 4.2V
Altitude 600m 3.5 ~ 3.9V
Altitude 1200m 3.3 ~ 3.7V
Altitude 1800m 3.0 ~ 3.4V
C-50 Engine ECU connector
measurement
• Engine ECU terminal voltage
measurement
• Ignition Switch: ON
• Voltage across 51 - earth
OK: Altitude 0m 3.8 ~ 4.2V
Altitude 600m 3.5 ~ 3.9V
Altitude 1200m 3.3 ~ 3.7V
Altitude 1800m 3.0 ~ 3.4V
OK
OK
OK
OK
NG
(1), (2) NG
(3) NG
NG
NG
OK
OK
OK
OK
OK
Repair
Repair
Repair
Repair
Repair
NG
NG
NG
NG
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