Mitsubishi Lancer Evolution X. Manual - part 253

MULTIPORT FUEL INJECTION (MFI) DIAGNOSIS

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MULTIPORT FUEL INJECTION (MFI)

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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).

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

have been met.

Judgment Criterion

• The open timing of the intake valve is faster than  

− 17.0 degrees (ATDC) for 10 seconds.

or

• The open timing of the intake valve is slower than 

− 3.9 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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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.
• Intake variable valve timing sprocket tooth com-

ing 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 intake 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 intake camshaft position sensor connector 

B-07, and connect test harness special tool (MB991709) 
between the separated connectors.

(4) Connect the oscilloscope probe to the intake 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. 14 (intake 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

AD

Intake camshaft position
sensor connector

Oscilloscope

MB991709

MULTIPORT FUEL INJECTION (MFI) DIAGNOSIS

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MULTIPORT FUEL INJECTION (MFI)

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(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 P0016 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 intake 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 P0016 set?

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

AK704223 AB

2 engine revolutions

Normal waveform

(Volt)

5

0

5

0

Crankshaft position sensor 
output wave pattern

Intake camshaft position sensor
output ware pattern

MULTIPORT FUEL INJECTION (MFI) DIAGNOSIS

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DTC P0017: Crankshaft/camshaft (exhaust) Position Sensor Phase Problem

.

TECHNICAL DESCRIPTION

• The ECM checks the variable valve timing sys-

tem for malfunction.

.

DESCRIPTIONS OF MONITOR METHODS

The close timing of the exhaust valve is faster or 

slower than the specified value.

.

MONITOR EXECUTION

Continuous

.

MONITOR EXECUTION CONDITIONS 
(Other monitor and Sensor)

Other Monitor (There is no temporary DTC stored 

in memory for the item monitored below)

• Not applicable

Sensor (The sensor below is determined to be 

normal)

• Camshaft position sensor
• Crankshaft position sensor
• Engine coolant temperature sensor
• Throttle position sensor
• Engine oil control valve

.