Mitsubishi Eclipse. Manual - part 511

MULTIPORT FUEL INJECTION (MFI) DIAGNOSIS

TSB Revision

MULTIPORT FUEL INJECTION (MFI) <3.0L>

13B-587

STEP 1. Using the oscilloscope, check the camshaft 
position sensor.
(1) Disconnect the camshaft position sensor connector B-22, 

and connect test harness special tool (MB991348) in 
between. (All terminals should be connected.)

(2) Connect the oscilloscope probe to the camshaft position 

sensor side connector terminal No. 5.
NOTE: When measuring with the ECM or PCM side con-
nector, connect an oscilloscope probe to terminal No. 50 
<M/T> or terminal No. 56 <A/T>.

(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 connector B-22 at camshaft position 
sensor for damage.
Q: Is the 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.

AK300439

3

4

5

1

2

6

7

B-22 (B)

AB

CONNECTOR: B-22

HARNESS CONNECTOR:
COMPONENT SIDE

AK102977AB

1 2 3 4 5 6 7

CAMSHAFT POSITION
SENSOR CONNECTOR

OSCILLOSCOPE

MB991348

AKX01420AB

2 ENGINE REVOLUTIONS

NORMAL WAVEFORM

5V

AK300439

3

4

5

1

2

6

7

B-22 (B)

AB

CONNECTOR: B-22

HARNESS CONNECTOR:
COMPONENT SIDE

MULTIPORT FUEL INJECTION (MFI) DIAGNOSIS

TSB Revision

MULTIPORT FUEL INJECTION (MFI) <3.0L>

13B-588

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 − Procedure 6 − 

Other Monitor 

P.13B-7

.

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

YES : Replace the ECM or PCM. 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 

P.00-6

.

STEP 4. Check connector B-22 at camshaft position 
sensor for damage.
Q: Is the 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. Check the sensor supply voltage at camshaft 
position sensor connector B-22.
(1) Disconnect the connector B-22 and measure at the harness 

side.

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

(3) Measure the voltage between terminal No. 5 and ground.

• Voltage should be between 4.8 and 5.2 volts.

(4) Turn the ignition switch to the "LOCK" (OFF) position.
Q: Is the measured voltage between 4.8 and 5.2 volts?

YES : Go to Step 10.
NO :  Go to Step 6.

AK300439

3

4

5

1

2

6

7

B-22 (B)

AB

CONNECTOR: B-22

HARNESS CONNECTOR:
COMPONENT SIDE

AK300439

3

4

5

1

2

6

7

B-22 (B)

AB

CONNECTOR: B-22

HARNESS CONNECTOR:
COMPONENT SIDE

AK000250AE

B-22 HERNESS 
CONNECTOR: 
COMPONENT SIDE

7 6 5 4 3 2 1

MULTIPORT FUEL INJECTION (MFI) DIAGNOSIS

TSB Revision

MULTIPORT FUEL INJECTION (MFI) <3.0L>

13B-589

STEP 6. Check the sensor supply voltage at ECM 
connector C-58 <M/T> or PCM connector C-55 <A/T> by 
backprobing.
(1) Do not disconnect the ECM connector C-58 <M/T> or PCM 

connector C-55 <A/T>.

(2) Disconnect the camshaft position sensor connector B-22.
(3) Turn the ignition switch to the "ON" position.

AK300462

42

43

48

49

50

51

52

53

54

55

56

57

46 45 44

58

59

60

61

62

63

64

65

66

47

41

CONNECTOR: C-55 <A/T>

C-55 (GR)

AB

HARNESS CONNECTOR:
COMPONENT SIDE

AK300748

65

43
50

42
49

41
48
60

61

64

46

47

58

59

67

68

45

56
66

52 51

44

53

62

54

63

57

55

CONNECTOR: C-58 <M/T>

AB

C-58 (GR)

HARNESS CONNECTOR:
COMPONENT SIDE

MULTIPORT FUEL INJECTION (MFI) DIAGNOSIS

TSB Revision

MULTIPORT FUEL INJECTION (MFI) <3.0L>

13B-590

(4) Measure the voltage between terminal No. 50 <M/T> or No. 

56 <A/T> and ground by backprobing.

• Voltage should be between 4.8 and 5.2 volts.

(5) Turn the ignition switch to the "LOCK" (OFF) position.
Q: Is the measured voltage between 4.8 and 5.2 volts?

YES : Go to Step 7.
NO :  Go to Step 8.

AK000251

41424344
48

50 51

49

52 5354555657 58 59

45 46 47

60 61

626364

65

67 68

66

AK000251AE

C-58 HARNESS 
CONNECTOR: 
HARNESS SIDE

AKX01545

41

AH

C-55 HARNESS 
CONNECTOR: 
HARNESS SIDE

42 43

44 45 46

47 48 49 50 51 52 53 54 55 56 57

58 59

60 61 62 63

64

66