Mitsubishi Eclipse. Manual - part 573

MULTIPORT FUEL INJECTION (MFI) DIAGNOSIS

TSB Revision

MULTIPORT FUEL INJECTION (MFI) <3.0L>

13B-835

DTC P0622: Generator FR Terminal Circuit Malfunction

AK000710

4

3

2

6

3 4
7 8

1 2

5

1

YELL

O

W

-BL

ACK

YELL

O

W

-BL

ACK

ENGINE CONTROL
MODULE (ECM) <M/T>
OR
POWERTRAIN CONTROL
MODULE (PCM) <A/T>

GENERATOR

VOLTAGE
REGULATOR

      B-45
(MU802046)

     B-13
MU802749

52 <M/T>
54 <A/T>

3

4

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

C-58 <M/T>
(MU803782)

C-55 <A/T>
(MU803781)

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

Generator Circuit

AK300099

CONNECTOR: B-45

AB

B-45 (GR)

AK300097

CONNECTOR: B-13

AB

B-13 (B)

MULTIPORT FUEL INJECTION (MFI) DIAGNOSIS

TSB Revision

MULTIPORT FUEL INJECTION (MFI) <3.0L>

13B-836

.

CIRCUIT OPERATION

• The ECM (terminal No. 52) <M/T> or PCM (termi-

nal No. 54) <A/T> apply a battery positive voltage 
into the generator FR terminal 4 via resistance 
inside the unit.

.

TECHNICAL DESCRIPTION

• When the generator field coils are controlled, the 

generator FR terminal inputs signal to the ECM 
<M/T> or PCM <A/T>.

• The ECM <M/T> or PCM <A/T> detects the gen-

erator output with the input signal, and controls 
the idle air control motor according to the genera-
tor output.

.

DTC SET CONDITIONS

Check Conditions

• Engine speed is higher than 50 r/min.

Judgement Criteria

• Input voltage from the generator FR terminal has 

continued to be approximately battery possitive 
voltage for 20 seconds.

.

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

• Open circuit in generator FR terminal circuit, har-

ness damage, 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

AK300091

CONNECTOR: C-58 <M/T>

ECM

AC

C-58 (GR)

AK300244

CONNECTOR: C-55 <A/T>

AG

PCM

C-55 (GR)

MULTIPORT FUEL INJECTION (MFI) DIAGNOSIS

TSB Revision

MULTIPORT FUEL INJECTION (MFI) <3.0L>

13B-837

STEP 1. Check the voltage at generator connector B-45 by 
backprobing.
(1) Do not disconnect the connector B-45.
(2) Start the engine and run at idle.

(3) Measure the voltage between terminal 4 and ground by 

backprobing.

a. Engine: warming up
b. Radiator fan: stopped

c. Headlight switch: OFF to ON

d. Rear defogger switch: OFF to ON
e. Stoplight switch: OFF to ON

• Voltage should be drops.

(4) Turn the ignition switch to the "LOCK" (OFF) position.
Q: Did the measured voltage drop?

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

STEP 2. Check connector B-45 at generator connector 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 10.

AK300756

2

1

3

4

CONNECTOR: B-45

AB

B-45 (GR)

HARNESS CONNECTOR:
COMPONENT SIDE

AK103518 AE

1 2 3 4

B-45 HARNESS 
CONNECTOR: 
HERNESS SIDE

AK300756

2

1

3

4

CONNECTOR: B-45

AB

B-45 (GR)

HARNESS CONNECTOR:
COMPONENT SIDE

MULTIPORT FUEL INJECTION (MFI) DIAGNOSIS

TSB Revision

MULTIPORT FUEL INJECTION (MFI) <3.0L>

13B-838

STEP 3. Using scan tool MB991958, read the diagnostic 
trouble code (DTC).

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) Read the DTC.
(4) Turn the ignition switch to the "LOCK" (OFF) position.
Q: Is DTC P0622 set?

YES : Replace the ECM or PCM. Then go to Step 10.
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-45 at generator intermediate 
connector 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 10.

AK300810

AB

MB991911

16-PIN

MB991827

MB991824 

AK300756

2

1

3

4

CONNECTOR: B-45

AB

B-45 (GR)

HARNESS CONNECTOR:
COMPONENT SIDE