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Mitsubishi Lancer Evolution X. Manual - part 334

MULTIPORT FUEL INJECTION (MFI) DIAGNOSIS

TSB Revision

MULTIPORT FUEL INJECTION (MFI)

13A-401

DTC SET CONDITIONS <Range/Performance problem − alignment>

Logic Flow Chart

Check Condition

• Engine is being cranked.

• Engine speed is higher than 500 r/min excluding

during cranking.

Judgement Criterion

• Normal signal pattern has not been input for cyl-

inder identification from the crankshaft position
sensor signal and intake camshaft position sen-
sor signal for 2 seconds.

FAIL-SAFE AND BACKUP FUNCTION

• Engine runs in learned pattern until engine stops.
• Does not control variable valve timing (V.V.T.).

OBD-II DRIVE CYCLE PATTERN

Refer to Diagnostic Function − OBD-II Drive Cycle −

Pattern 23

P.13A-9

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

• Intake camshaft position sensor failed.
• Open or shorted intake camshaft position sensor

circuit, or harness damage, or connector dam-
age.

• Intake camshaft failed.
• ECM failed.

Good

Malfunction

Correct signal

pattem is detected

End

AK604335

Start

Yes

Monitoring
conditions

Continuous

failure for 2secs

MULTIPORT FUEL INJECTION (MFI) DIAGNOSIS

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MULTIPORT FUEL INJECTION (MFI)

13A-402

DIAGNOSIS

Required Special Tools:

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

STEP 1. Using the oscilloscope, check the intake camshaft
position sensor.
(1) Disconnect the intake camshaft position sensor connector

B-07, and connect test harness special tool (MB991709)
between the separated connectors. (All terminals should be
connected.)

(2) 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. 14.

(3) Start the engine and run at idle.

(4) Check the waveform.

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

tration.

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

YES : Go to Step 2.
NO : Go to Step 4.

STEP 2. Check harness connector B-07 at intake camshaft
position sensor and harness connector B-09 at ECM for
damage.
Q: Is the harness connector in good condition?

YES : Go to Step 3.
NO : Repair or replace it. Refer to GROUP 00E, Harness

Connector Inspection

P.00E-2

. Then go to Step 19.

AK604465

Intake camshaft position
sensor connector

Oscilloscope

MB991709

AK704274 AB

2 engine revolutions

Normal waveform

5Volt

MULTIPORT FUEL INJECTION (MFI) DIAGNOSIS

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MULTIPORT FUEL INJECTION (MFI)

13A-403

STEP 3. Check the trouble symptoms.
(1) Carry out a test drive with the drive cycle pattern. Refer to

Diagnostic Function − OBD-II Drive Cycle − Pattern 23

P.13A-9

(2) Check the diagnostic trouble code (DTC).
Q: Is DTC P0340 set?

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

P.42B-11

or GROUP 42C, ID Codes

Registration Judgment Table <Vehicles with WCM>

P.42C-9

. Then go to Step 19.

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 4. Check harness connector B-07 at intake camshaft
position sensor for damage.
Q: Is the harness connector in good condition?

YES : Go to Step 5.
NO : Repair or replace it. Refer to GROUP 00E, Harness

Connector Inspection

P.00E-2

. Then go to Step 19.

STEP 5. Measure the sensor supply voltage at intake
camshaft position sensor connector B-07.
(1) Disconnect the connector B-07 and measure at the harness

side.

(2) Turn the ignition switch to the "ON" position.
(3) Measure the voltage between terminal No. 3 and ground.

• Voltage should be between 4.9 and 5.1 volts.

(4) Turn the ignition switch to the "LOCK" (OFF) position.
Q: Is the measured voltage between 4.9 and 5.1 volts?

YES : Go to Step 9.
NO : Go to Step 6.

STEP 6. Check harness connector B-09 at ECM for
damage.
Q: Is the harness connector in good condition?

YES : Go to Step 7.
NO : Repair or replace it. Refer to GROUP 00E, Harness

Connector Inspection

P.00E-2

. Then go to Step 19.

AK604201

B-07 harness
connector:
component side

MULTIPORT FUEL INJECTION (MFI) DIAGNOSIS

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MULTIPORT FUEL INJECTION (MFI)

13A-404

STEP 7. Measure the sensor supply voltage at ECM
connector B-09 by using power plant ECU check harness
special tool MB992110.
(1) Disconnect the all ECM connectors. Connect the power

plant ECU check harness special tool MB992110 between
the separated connectors.

(2) Disconnect the intake camshaft position sensor connector

B-07.

(3) Turn the ignition switch to the "ON" position.

(4) Measure the voltage between terminal No. 14 and ground.

• Voltage should be between 4.9 and 5.1 volts.

(5) Turn the ignition switch to the "LOCK" (OFF) position.
Q: Is the measured voltage between 4.9 and 5.1 volts?

YES : Repair harness wire between intake camshaft

position sensor connector B-07 (terminal No. 3) and
ECM connector B-09 (terminal No. 14) because of
open circuit. Then go to Step 19.

NO : Go to Step 8.

STEP 8. Check for short circuit to ground between intake
camshaft position sensor connector B-07 (terminal No. 3)
and ECM connector B-09 (terminal No. 14).
Q: Is the harness wire in good condition?

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

P.42B-11

or GROUP 42C, ID Codes

Registration Judgment Table <Vehicles with WCM>

P.42C-9

. Then go to Step 19.

NO : Repair it. Then go to Step 19.

AK604040

ECM

Body side harness

MB992110

AK604202

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

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

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

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

Power plant ECU
check harness connector

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