Mitsubishi Lancer Evolution 8. Manual — part 165
MPI – TROUBLESHOOTING
13A-46
Checking Procedure 8
Has the battery been disconnected recently?
MUT-II/III Diagnosis Codes
• Has diagnosis code been output?
MUT-II/III Service Data
• No.12: AFS sensor
• No.13: Intake air temp. sensor
• No.14 TPS
• No.21: Water temp. sensor
• No.25: Atmospheric air pressure sensor
(P.13A-83)
<reference>
When all service data values are correct, proceed to OK.
If there is even a single abnormal service data value,
proceed to NG.
MUT-II/III Service Data
• No.45: ISC servo position
(ref. P.13A-83)
MUT-II/II Service Data
• No.27: Power steering fluid pressure switch
(ref.P.13A-83)
Check timing belt timing marks
Check intake hose and air being taken in by inlet
manifold
Check throttle body for dirt (area of throttle valve)
MUT-II/III Service Data
• No.11 : O2 sensor (ref. P.13-83)
To next page
* Refer to ’01–1 Lancer Evolution VII Workshop Manual (No.1036K02)
After engine has warmed up, run in idling mode for about
10 minutes
Diagnosis Code List (ref. P.13A-5)
Go to checking procedure relevant to diagnosis code for
the sensor that has generated abnormal service data
value.
(ref. P.13A-5)
Checking Procedure 34: Check idle speed control (ISC)
servo (check stepper motor system) (ref.P13A-79)
Checking Procedure 29: Power steering fluid pressure
switch system check (ref.P.13A-74)
Match up timing belt timing marks
Clean throttle body (area of throttle valve)
(ref.P.13D-107) *
Code No. P0130: Check O2 sensor system
(ref.P.13A-19)
Irregular idling (rough idling, hunting), incorrect idling speed (high or
low idling speed), engine stalls when idling (dies out)
Probable causes
The probable causes are noted right.
• ISC control system malfunction
• Air fuel control system malfunction
• Ignition system malfunction
• Fuel system malfunction
• Exhaust system malfunction
• Exhaust gas cleaning system malfunction
• Throttle valve malfunction
• Timing belt malfunction
• Compression pressure malfunction
• Engine ECU malfunction
YES
YES
NO
NO
OK
OK
OK
OK
OK
OK
NG
NG
NG
NG
NG
NG
NG
Repair
MPI – TROUBLESHOOTING
13A-47
From previous page
C50 engine ECU connector
measurement
• Engine ECU terminal voltage
measurement
(1) Voltage across 60 – earth
(2) Voltage across 46 – earth
Voltage across 58 – earth
(Ignition switch: ON)
OK: 0.5V or less
C-49, C-50 Engine ECU
connector measurement
• Engine ECU terminal voltage
measurement
• Engine idling (after warm up)
• Radiator fan: not operating
• Voltage across 52 – earth
OK: headlamps go off
when
they come on, the voltage rises
by about 0.2 ~3.5V.
• Voltage across 52 – earth)
OK: Headlamps go off
if they
come on, voltage drops
C50 engine ECU connector measurement
• Engine ECU terminal voltage measurement
• Engine idling
• A/C switch: ON (A/C compressor running)
• Voltage across 65 – earth
(A/C set temp.: minimum temp.)
(Air flow: maximum)
OK: 1V or less
(A/C set temp.: room temp.)
(Air flow: minimum)
OK: Battery voltage
To next page
Check connectors C-50, C-21,
C-07, C-209, C-211, C-32
Check harness between engine
ECU and battery, and check
power supply cable to see it is
broken, has a short circuit, or is
damaged
Confirm fault symptoms
Replace engine ECU
Check connector C-50
Check and repair harness
between engine ECU and earth
joint
• Check earth wire to see if
broken or damaged
Check connectors C-49, C-50,
B-21, B-03
Check harness between
alternator and engine ECU
• check output wire to see if it is
broken, has a short circuit, or is
damaged
Confirm fault symptoms
Replace alternator
Intermittent malfunction (ref.
Chapter 00 – Intermittent
Malfunctions)
Intermittent malfunction (ref.
Chapter 00 – Intermittent
Malfunctions)
Checking procedure 28: A/C load signal system check
(ref. P.13A-73)
OK
OK
OK
OK
OK
OK
OK
OK
OK
OK
OK
NG
NG
NG
NG
NG
NG
NG
NG
(2) NG
(1) NG
(1) NG
Repair
Repair
Repair
Repair
Repair
MPI – TROUBLESHOOTING
13A-48
From previous page
Check spark plug cables (ref. Chapter 16 – Ignition
Devices)
Check spark plugs (ref. Chapter 16 – Ignition Devices)
Check connector B-123, B-119
Check ignition coils (ref. Chapter 16 – Ignition Devices)
Check harness between ignition coil and body earth, and
engine ECU and ignition coil, and check to see if
connectors are broken, have any short circuits, or are
damaged
Check compression pressure (ref. Chapter 11 – Engine
Adjustment)
Check purge control solenoid valve (ref. Chapter 17 –
Exhaust gas cleaning devices checks)
Check fuel pressure (ref. P.13D-109) *
Check harness between injectors and engine ECU, and
check to see if connectors are broken, have a short
circuit, or are damaged
Replace injectors on all cylinders
Confirm fault symptoms
Replace engine ECU
Confirm fault symptoms
Check to see whether anything has contaminated the
fuel (water, light oil etc.)
Replace spark plug cables
Replace spark plugs
Replace ignition coil
Replace purge control solenoid valve
* Refer to ’01–1 Lancer Evolution VII Workshop Manual (No.1036K02)
OK
OK
OK
NG
NG
NG
NG
NG
NG
NG
NG
NG
NG
OK
OK
OK
OK
OK
OK
OK
OK
Repair
Repair
Repair
Finish
Finish
Repair
MPI – TROUBLESHOOTING
13A-49
Checking Procedure 9
Has the battery been disconnected recently?
MUT-II/III Diagnosis Codes
• Has diagnosis code been output?
Check spark plug cables (ref. Chapter 16 – Ignition
Devices)
Check spark plugs (ref. Chapter 16 – Ignition Devices)
Check connectors B-123, B-119
Check ignition coils (ref. Chapter 16 – Ignition Devices)
Check harness between ignition coil and body earth, and
engine ECU and ignition coil, and check to see if
connectors are broken, have any short circuits, or are
damaged
Check air being taken in via intake hose and inlet
manifold
Check for dirt on throttle body (in area of throttle valve)
Confirm fault symptoms
Replace engine ECU
After engine has warmed up, run in idling mode for about
10 minutes
Diagnosis Code List (ref. P.13A-5)
Replace spark plug cables
Replace spark plugs
Replace ignition coil
Clean throttle body (in area of throttle valve)
(ref. P-13D-107)*
* Refer to ’01–1 Lancer Evolution VII Workshop Manual (No.1036K02)
Engine stalling when pulling away from standing (pass out)
Probable causes
The probable causes are noted right.
• Ignition system malfunction
• Air intake system malfunction
• Exhaust gas cleaning system malfunction
• Throttle body malfunction
• Engine ECU malfunction
NO
YES
YES
NG
NG
NG
NG
NG
NG
NG
OK
NG
OK
OK
OK
OK
OK
OK
OK
OK
Repair
Repair
Repair
Finish
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