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

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)

Checking procedure 28: A/C load signal system check
(ref. P.13A-73)

(2) NG

(1) NG

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)

Repair

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

YES

Repair

Finish

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