Mitsubishi Lancer Evolution 8. Manual — part 166
MPI – TROUBLESHOOTING
13A-50
Checking Procedure 10
Has the battery been disconnected recently?
MUT-II/III Diagnosis Codes
• Has diagnosis code been output?
MUT-II/III Service Data
• No.14: TPS (ref. P.13A-83)
MUT-II/III Service Data
• No.45: ISC (servo) position (re.P.13A-83)
• When decelerating, (engine speed at least 1,000 rpm),
does ISC servo position drop to 0 ~ 2 step?
Check throttle body for dirt (throttle valve area)
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)
Code No.P0120: Throttle position sensor system check
(ref.P13A-16)
Code No. P.0500: Vehicle speed sensor system (ref.
P.13A-30)
Clean throttle body (in area of throttle valve)
(ref. P-13D-107)*
* Refer to ’01–1 Lancer Evolution VII Workshop Manual (No.1036K02)
Checking Procedure 11
MUT-II/III Diagnosis Codes
• Has diagnosis code been output?
Check ignition timing (ref. Chapter 11 – Engine
Adjustment)
To next page
Diagnosis Code List (ref. P.13A-5)
Check crank angle sensor and timing belt cover
assembly condition
Engine stalling during deceleration
Probable causes
The probable causes are noted right.
• ISC control system malfunction
• Exhaust gas cleaning system malfunction
• Throttle valve malfunction
• Engine ECU malfunction
Pulsating/Discontinuous Combustion (hesitation, sag), Poor
Acceleration, Stumble, Surge
Probable causes
The probable causes are noted right.
• Air fuel ratio control system malfunction
• Ignition system malfunction
• Fuel system malfunction
• Intake/Exhaust system malfunction
• Exhaust gas cleaning system malfunction
• Compression pressure poor
• Turbocharger system malfunction
OK
NO
OK
OK
OK
NG
YES
NO
OK
NO
NG
NG
NG
YES
YES
YES
Finish
MPI – TROUBLESHOOTING
13A-51
From previous page
Check injector operating noise (Use sound scope)
MUT-II/III Service Data
• No.13: Intake air temp. sensor
• No.14: TPS
• No.21: Water temp. sensor
(ref. 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.
Check purge control solenoid valve (ref. Chapter 17
–Exhaust Gas Cleaning Device Checks)
MUT-II/III Service Data
• No.11: O2 sensor (ref. P.13A-83)
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
MUT-II/III Actuator Test
• No.12: Waste gate solenoid valve
(P.13A-83)
To next page
Go to checking procedure relevant to diagnosis code for
the sensor that has generated abnormal service data
value.(ref. P.13A-5)
Abnormal cylinder code No.P0201 ~ P0204: Check
injector system
Replace purge control solenoid valve
Code No. P0130: Check O2 sensor system (P.13A-19)
Replace spark plug cables
Replace spark plugs
Replace ignition coil
Checking Procedure 33: Check waste gate solenoid
valve system (P.13A-78)
OK
OK
OK
OK
OK
OK
NG
NG
NG
NG
NG
OK
NG
NG
NG
NG
OK
OK
OK
OK
Repair
Repair
MPI – TROUBLESHOOTING
13A-52
From previous page
Check turbocharger pressure (ref. Chapter 15 – Intake
Exhaust and Vehicle Servicing)
Check turbocharging pressure control system (ref.
Chapter 15 – Intake Exhaust and Vehicle Servicing)
MUT-II/III Actuator Test
No. 09: Fuel pressure control solenoid valve (P.13A-87)
Check fuel pressure (P.13D-109) *
Confirm fault symptoms
Check compression pressure (ref. Chapter 11 – Engine
Adjustment)
Confirm fault symptoms
Check and repair broken intake hose or inlet manifold,
and air intake
Checking procedure 31: Fuel pressure control solenoid
valve system (ref. P.13A-76)
* Refer to ’01–1 Lancer Evolution VII Workshop Manual (No.1036K02)
Checking Procedure 12
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 coil component (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
Diagnosis Code List (ref. P.13A-5)
Replace spark plug cables
Replace spark plugs
Replace ignition coil
Acceleration Shock
Probable causes
The reason is likely to be ignition leak associated with an increase in spark
plug demand voltage during acceleration.
• Ignition system malfunction.
OK
NG
NG
NG
NG
OK
OK
OK
OK
OK
OK
NG
OK
NG
NO
OK
OK
OK
YES
NG
NG
NG
NG
OK
Finish
Repair
Finish
Repair
Repair
Repair
Repair
MPI – TROUBLESHOOTING
13A-53
Checking Procedure 13
MUT-II/III Diagnosis Codes
• Has diagnosis code been output?
MUT-II/III Service Data
• No.14: TPS (ref. P.13A-83)
Check ISC servo operating noise (P.13D-117) *
Check and clean throttle body for dirt (throttle valve area)
(ref.P.13D-107) *
Diagnosis Code List (ref. P.13A-5)
Code No.P0120: Throttle position sensor system check
(ref.P13A-16)
Checking procedure 34: Check idling speed control (ISC)
servo (stepper motor) system (P.13A-79)
* Refer to ’01–1 Lancer Evolution VII Workshop Manual (No.1036K02)
Checking Procedure 14
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 coil component (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
Code No.P0325: Check knock sensor system (P.13A-29)
Diagnosis Code List (ref. P.13A-5)
Replace spark plug cables
Replace spark plugs
Replace ignition coil
Acceleration Shock
Probable causes
ISC malfunction is a likely cause.
• ISC control system malfunction
Knocking
Probable causes
The probable causes are noted right.
• Knock sensor malfunction
• Knock control system malfunction
• Spark plug malfunction
• Ignition system malfunction
• Engine ECU malfunction
YES
NG
NG
OK
NO
YES
YES
OK
OK
OK
OK
OK
YES
YES
YES
YES
OK
NO
Repair
Repair
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