Mitsubishi Eclipse. Manual - part 572

MULTIPORT FUEL INJECTION (MFI) DIAGNOSIS

TSB Revision

MULTIPORT FUEL INJECTION (MFI) <3.0L>

13B-831

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

• Power steering pressure switch failed.

• Incorrect power steering fuid level.

• Incorrect oil pump pressure.

• Harness damage in power steering pressure 

switch circuit, or connector damage.

• ECM failed. <M/T>

• PCM failed. <A/T>

DIAGNOSIS

Required Special Tools:

• MB991958: Scan tool (MUT-III Sub Assembly)

• MB991824: V.C.I.

• MB991827: USB Cable

• MB991911: Main Harness B

STEP 1. Using scan tool MB991958, check data list item 27: 
Power Steering Pressure Switch.

CAUTION

To prevent damage to scan tool MB991958, always turn the 
ignition switch to the "LOCK" (OFF) position before con-
necting or disconnecting scan tool MB991958.
(1) Connect scan tool MB991958 to the data link connector.
(2) Start the engine and run at idle.
(3) Set scan tool MB991958 to the data reading mode for item 

27, Power Steering Pressure Switch.

• If the steering wheel is stopped while idling, "OFF" will 

be displayed.

• If the steering wheel is steered while idling, "ON" will be 

displayed.

(4) Turn the ignition switch to the "LOCK" (OFF) position.
Q: Is the sensor operating properly?

YES : It can be assumed that this malfunction is intermittent. 

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

P.00-6

.

NO :  Go to Step 2.

STEP 2. Check the power steering fluid level.
Refer to GROUP 37A, On-Vehicle Service - Fluid Level Check 

P.37A-17

.

Q: Are there any abnormalities?

YES : Repair it. Then go to Step 7.
NO :  Go to Step 3.

STEP 3. Check the power steering pressure switch.
Refer to GROUP 37A, On-Vehicle Service - Power Steering 
Pressure Switch Check

P.37A-20

.

Q: Are there any abnormalities?

YES : Replace the power steering pressure switch. Then go 

to Step 7.

NO :  Go to Step 4.

AK300810

AB

MB991911

16-PIN

MB991827

MB991824 

MULTIPORT FUEL INJECTION (MFI) DIAGNOSIS

TSB Revision

MULTIPORT FUEL INJECTION (MFI) <3.0L>

13B-832

STEP 4. Check the oil pump pressure .
Refer to GROUP 37A, On-Vehicle Service - Oil Pump Pressure 
Test 

P.37A-3

.

Q: Are there any abnormalities?

YES : Repair it. Then go to Step 7.
NO :  Go to Step 5.

STEP 5. Check harness connector B-19 at the power 
steering pressure switch and harness connector C-58 at 
ECM <M/T> or C-55 at PCM <A/T> for damage.
Q: Is the harness connector in good condition?

YES : Go to Step 6.
NO :  Repair or replace it. Refer to GROUP 00E, Harness 

Connector Inspection 

P.00E-2

. Then go to Step 7.

AK300437

1

CONNECTOR: B-19

AB

B-19

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

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

MULTIPORT FUEL INJECTION (MFI) DIAGNOSIS

TSB Revision

MULTIPORT FUEL INJECTION (MFI) <3.0L>

13B-833

STEP 6. Check for harness damage between power 
steering pressure switch connector B-19 (terminal No. 1) 
and ECM connector C-58 (terminal No. 54) <M/T> or PCM 
connector C-55 (terminal No. 52) <A/T>.

AK300437

1

CONNECTOR: B-19

AB

B-19

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

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

MULTIPORT FUEL INJECTION (MFI) DIAGNOSIS

TSB Revision

MULTIPORT FUEL INJECTION (MFI) <3.0L>

13B-834

NOTE: Check harness after checking intermediate connector 
B-47. If intermediate connector is damaged, repair or replace 
them. Refer to GROUP 00E, Harness Connector Inspection 

P.00E-2

. Then go to Step 7.

Q: Is the harness wire in good condition?

YES : Replace the PCM. Then go to Step 7.
NO :  Repair it. Then go to Step 7.

STEP 7. Using scan tool MB991958, check data list item 27: 
Power Steering Pressure Switch.

CAUTION

To prevent damage to scan tool MB991958, always turn the 
ignition switch to the "LOCK" (OFF) position before con-
necting or disconnecting scan tool MB991958.
(1) Connect scan tool MB991958 to the data link connector.
(2) Start the engine and run at idle.
(3) Set scan tool MB991958 to the data reading mode for item 

27, Power Steering Pressure Switch.

• If the steering wheel is not turned while idling, "OFF" will 

be displayed.

• If the steering wheel is turned while idling, "ON" will be 

displayed.

(4) Turn the ignition switch to the "LOCK" (OFF) position.
Q: Is the switch operating properly?

YES : The procedure is complete.
NO :  Repeat the troubleshooting.

AK300810

AB

MB991911

16-PIN

MB991827

MB991824