Mitsubishi Eclipse / Eclipse Spyder (2000-2002). Service and repair manual — part 321

MULTIPORT FUEL INJECTION (MFI) DIAGNOSIS

TSB Revision

MULTIPORT FUEL INJECTION (MFI) <3.0L ENGINE>

13B-483

DIAGNOSIS

STEP 1. Check connector C-58 at ECM <M/T> or connector
C-55 at PCM <A/T> for damage.

Q: Is the connector in good condition?

YES : Go to Step 2.
NO : Repair or replace it. Refer to GROUP 00E, Harness

Connector Inspection (

P.00E-2

). Then confirm that

the malfunction symptom is eliminated.

STEP 2. Check the output voltage at ECM harness side
connector C-58 <M/T> or PCM harness side connector C-
55 <A/T>.
(1) Disconnect the connector C-118 <M/T> or C-115 <A/T> and

measure at the harness side.

(2) Start the engine and run at idle.
(3) Turn the A/C switch "ON".
(4) Measure the voltage between terminal 65 <M/T> or 61 <A/

T> and ground.

•

If atmospheric air temperature is 15

°

C (59

°

F) or less,

the voltage should be 1 volt or less.

•

If atmospheric air temperature is 18

°

C (65.4

°

F) or

more, the voltage should be battery positive voltage.

(5) Turn the A/C switch "OFF".
(6) Turn the ignition switch to the "LOCK" (OFF) position.

Q: Is the voltage normal?

YES : Replace the ECM or PCM. Then confirm that the

malfunction symptom is eliminated.

NO : Refer to GROUP 55, Introduction To Heater, Air

Conditioning And Ventilation Diagnosis (

P.55-4

).

AK000366AC

47 46 45

41

42

43

44

48

49

50

51

52

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55

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57

58

59

60

61

62

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64

65

66

67

68

<M/T>

C-58 HARNESS
SIDE CONNECTOR

AK000367AC

<A/T>

C-55 HARNESS
SIDE CONNECTOR

41

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45

46

47

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51

52

53

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55

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58

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65

66

MULTIPORT FUEL INJECTION (MFI) DIAGNOSIS

TSB Revision

MULTIPORT FUEL INJECTION (MFI) <3.0L ENGINE>

13B-484

INSPECTION PROCEDURE 28: Fans (radlator fan, A/C condenser fan) are inoperative

AK000715

2 3

1

5

1

4

8

7

2

6

3

BLUE-

ORANGE

BLUE-

ORANGE

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

FAN CONTROLLER

A-30
(MU802322)

C-07
MU801333

2

6

18

C-51<M/T>,C-52<A/T>
(MU803784)

2

3 4

5 6

7 8

9

11 12 13 14 15 16 17 18 19 20

30

21 22 23

24 25

26 27 28 29

3132 33

34 35

1

10

5V

AK000225

CONNECTOR : C-51<M/T>, C-52<A/T>

C-52

C-51

PCM<A/T>

ECM<M/T>

AJ

ACX02501 AE

CONNECTOR : A-30

FAN
CONTROLLER

MULTIPORT FUEL INJECTION (MFI) DIAGNOSIS

TSB Revision

MULTIPORT FUEL INJECTION (MFI) <3.0L ENGINE>

13B-485

CIRCUIT OPERATION

•

The PCM sends a duty signal to the fan controller
according to engine coolant temperature, vehicle
speed, and the condition of the A/C switch. (The
closer the average voltage at the terminal comes
to five volts, the higher the fan speed becomes).

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

•

Malfunction of the fan motor relay.

•

Malfunction of the fan motor.

•

Malfunction of the fan controller.

•

Improper connector contact, open or short-
circuited harness wire.

•

ECM <M/T> or PCM <A/T> failed.

DIAGNOSIS

STEP 1. Check connector C-51 at ECM <M/T> or connector
C-52 at PCM <A/T> for damage.
Q: Is the connector in good condition?

YES : Go to Step 2.
NO : Repair or replace it. Refer to GROUP 00E, Harness

Connector Inspection (

P.00E-2

). Then confirm that

the malfunction symptom is eliminated.

STEP 2. Check the output voltage at ECM harness side
connector C-51 <M/T> or PCM harness side connector C-
52 <A/T>.
(1) Disconnect the connector C-51 <M/T> or C-52 <A/T> and

measure at the harness side.

(2) Turn the ignition switch to the "ON" position.
(3) Measure the voltage between terminal 18 and ground.

•

Voltage should be between 4.8 and 5.2 volts. (Fan
rotates at high speed.)

(4) Connect a jumper cable between 18 and ground.

•

The fan should stop.

(5) Turn the ignition switch to the "LOCK" (OFF) position.

Q: Is the voltage and fan condition normal?

YES : Replace the ECM or PCM. Then confirm that the

malfunction symptom is eliminated.

NO : Go to Step 3.

AK000312AJ

CONNECTOR:C-07

AK000225

CONNECTOR : C-51<M/T>, C-52<A/T>

C-52

C-51

PCM<A/T>

ECM<M/T>

AJ

AK000368

1

2

3

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5

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35

C-51<M/T>, C-52<A/T>
HARNESS SIDE
CONNECTOR

AC

MULTIPORT FUEL INJECTION (MFI) DIAGNOSIS

TSB Revision

MULTIPORT FUEL INJECTION (MFI) <3.0L ENGINE>

13B-486

STEP 3. Check for open circuit and short circuit to ground
and harness damage between fan controller A-30 terminal
2 and ECM connector C-51 terminal 18 <M/T> or PCM
connector C-52 terminal 18 <A/T>.
NOTE: Check harness after checking intermediate connector
C-07. If intermediate connector is damaged, repair or replace
them. Refer to GROUP 00E, Harness Connector Inspection
(

P.00E-2

). Then confirm that the malfunction symptom is

eliminated.

Q: Is the harness wire in good condition?

YES : Refer to GROUP 14-Engine Cooling Diagnosis-

Symptom Chart (

P.14-3

).

NO : Repair it. Then confirm that the malfunction symptom

is eliminated.

ACX02501 AE

CONNECTOR : A-30

FAN
CONTROLLER

AK000225

CONNECTOR : C-51<M/T>, C-52<A/T>

C-52

C-51

PCM<A/T>

ECM<M/T>

AJ