Mitsubishi Lancer Evolution X. Manual — part 254

MULTIPORT FUEL INJECTION (MFI) DIAGNOSIS

TSB Revision

MULTIPORT FUEL INJECTION (MFI)

13A-81

DTC SET CONDITIONS

Logic Flow Chart

Check Conditions

• Engine speed is between 594 r/min and 1,500

r/min.

• Engine coolant temperature is between 20° C

(68° F) and 88° C (190° F).

• Exhaust engine oil control valve is "OFF".
• 1 second has elapsed after the above mentions

have been met.

Judgment Criterion

• The close timing of the exhaust valve is faster

than −

7.7 degrees (ATDC) for 10 seconds.

or

• The close timing of the exhaust valve is slower

than 5.4 degrees (ATDC) for 10 seconds.

.

FAIL-SAFE AND BACKUP FUNCTION

• None

.

AK900350

Good

Malfunction

End

No

No

No

No

No

Cam angle

<

θ MIN

Cam angle

>

θ MAX

Start

Yes

Yes

Yes

Yes

Yes

Continuous

failure for 10secs

Monitoring
conditions

Engine oil control valve

solenoid activation

command OFF

Cam angle: Intake valve open timing (intake side)
Exhaust valve close timing (exhaust side)

θ MAX : Maximum threshold value

θ MIN : Minimum threshold value

MULTIPORT FUEL INJECTION (MFI) DIAGNOSIS

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MULTIPORT FUEL INJECTION (MFI)

13A-82

OBD-II DRIVE CYCLE PATTERN

Refer to Diagnostic Function − OBD-II Drive Cycle −

Pattern 20

P.13A-9

.

.

TROUBLESHOOTING HINTS (The most
likely causes for this code to be set are:)

• Timing chain in out of place.
• Loose timing chain.
• Exhaust variable valve timing sprocket tooth

coming off.

• ECM failed.

DIAGNOSIS

Required Special Tools

• MB991709: Test Harness
• MB992110: Power Plant ECU Check Harness

STEP 1. Using the oscilloscope, measure output wave
pattern at crankshaft position sensor and exhaust
camshaft position sensor.
(1) Disconnect the crankshaft position sensor connector B-13

and connect the test harness special tool (MB991709)
between the separated connectors.

(2) Connect the oscilloscope probe to the crankshaft position

sensor side connector terminal No. 3.

(3) Disconnect the exhaust camshaft position sensor connector

B-05, and connect test harness special tool (MB991709)
between the separated connectors.

(4) Connect the oscilloscope probe to the exhaust camshaft

position sensor side connector terminal No. 3.
NOTE: When measuring with the ECM side connector, dis-
connect all ECM connectors. Connect the check harness
special tool (MB992110) between the separated connec-
tors. Then connect the oscilloscope probe to the check har-
ness connector terminal No. 8 (crankshaft position sensor)
and terminal No. 7 (exhaust camshaft position sensor).

(5) Start the engine and run at idle.

AK704086

3

2

1

AB

Crankshaft position
sensor connector

Oscilloscope

MB991709

AK604465

3

2

1

AE

Exhaust camshaft position
sensor connector

Oscilloscope

MB991709

MULTIPORT FUEL INJECTION (MFI) DIAGNOSIS

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MULTIPORT FUEL INJECTION (MFI)

13A-83

(6) Check the waveform.

• The waveform should show a pattern similar to the illus-

tration.

(7) Turn the ignition switch to the "LOCK" (OFF) position.
Q: Is the waveform normal?

YES : Go to Step 2.
NO : Go to Step 3.

STEP 2. Check the trouble symptoms.
(1) Carry out a test drive with the drive cycle pattern. Refer to

Diagnostic Function − OBD-II Drive Cycle − Pattern 20

P.13A-9

.

(2) Check the diagnostic trouble code (DTC).
Q: Is DTC P0017 set?

YES : Replace the ECM. When the ECM is replaced,

register the ID code. Refer to GROUP 42B, ID Code
Registration Necessity Judgment Table <Vehicles
with KOS>

P.42B-11

or GROUP 42C, ID Codes

Registration Judgment Table <Vehicles with WCM>

P.42C-9

. Then go to Step 4.

NO : It can be assumed that this malfunction is intermittent.

Refer to GROUP 00, How to Use Troubleshooting/
Inspection Service Points − How to Cope with

Intermittent Malfunctions

P.00-15

.

STEP 3. Check timing mark on the timing chain.
Q: Is timing chain in out of place?

YES : Repair it. Then go to Step 4.
NO : Check the following items, and repair or replace the

defective items.

a. Check the timing chain loose.
b. Check the exhaust variable valve timing

sprocket tooth coming off.

Then go to Step 4.

STEP 4. Test the OBD-II drive cycle.
(1) Carry out a test drive with the drive cycle pattern. Refer to

Diagnostic Function − OBD-II Drive Cycle − Pattern 20

P.13A-9

.

(2) Check the diagnostic trouble code (DTC).
Q: Is DTC P0017 set?

YES : Retry the troubleshooting.
NO : The inspection is complete.

AK704224 AB

2 engine revolutions

Normal waveform

(Volt)

5

0

5

0

Crankshaft position sensor
output wave pattern

Exhaust camshaft position sensor
output ware pattern

MULTIPORT FUEL INJECTION (MFI) DIAGNOSIS

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MULTIPORT FUEL INJECTION (MFI)

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DTC P0031: Heated Oxygen Sensor (front) Heater Circuit Low

AK704225

1

3

2

4

1

2

3 4 5 6 7 8 9 10 11 12 13 14 15 16

17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32

33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48

49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64

1 2
3 4

2

8

7

6

5

4

3

11

21

20

19

18

17

16

15

14

13

12

9

22

1

10

HEATED OXYGEN SENSOR (FRONT) HEATER CIRCUIT

20A

WHITE

BLUE-BLA

CK

WHITE

WHITE

A-34X

MFI
RELAY

RELAY BOX
(ENGINE COMPARTMENT)

4

3

1

2

22

TO ECM

HEATED OXYGEN SENSOR
(FRONT)

1

4

2

3

TO ECM

TO ECM

ENGINE
CONTROL
MODULE

34

C-34

B-09

A-13

36

FUSIBLE LINK

BLUE

8

OFF

ON

AB