Mitsubishi Eclipse / Eclipse Spyder (2000-2002). Service and repair manual — part 121

MULTIPORT FUEL INJECTION (MFI) DIAGNOSIS

TSB Revision

MULTIPORT FUEL INJECTION (MFI) <2.4L ENGINE>

13A-183

STEP 1. Using scan tool MB991502, check data list item 22:
Crankshaft Position Sensor.

CAUTION

To prevent damage to scan tool MB991502, always turn the
ignition switch to the "LOCK" (OFF) position before
connecting or disconnecting scan tool MB991502.
(1) Connect scan tool MB991502 to the data link connector.
(2) Start the engine and run at idle.
(3) Set scan tool MB991502 to the data reading mode for item

22, Crankshaft Position Sensor.

•

The tachometer and engine speed indicated on the scan
tool should much.

(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. Using the oscilloscope, check the crankshaft
position sensor.
(1) Do not disconnect the crankshaft position sensor connector

B-20.

(2) Connect the oscilloscope probe to terminal 2 of the

crankshaft position sensor by backprobing.

NOTE: Connect the oscilloscope probe to terminal 89 <M/
T> or terminal 45 <A/T> by backprobing when measuring
with the ECM or PCM connector.

(3) Start the engine and run at idle.
(4) Check the waveform.

•

The waveform should show a pattern similar to the
illustration.

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

Q: Is the waveform normal?

YES : Go to Step 3.
NO : Go to Step 5.

AKX01177

16 PIN

MB991502

AB

AKX01500

CRANKSHAFT POSITION
SENSOR CONNECTOR

OSCILLOSCOPE

1 2

3

AB

OSCILLO-
SCOPE
PROBE

AKX01559AB

NORMAL WAVEFORM

2 ENGINE REVOLUTIONS

5V

MULTIPORT FUEL INJECTION (MFI) DIAGNOSIS

TSB Revision

MULTIPORT FUEL INJECTION (MFI) <2.4L ENGINE>

13A-184

STEP 3. Check connector B-20 at the crankshaft position
sensor for damage.
Q: Is the connector in good condition?

YES : Go to Step 4.
NO : Repair or replace it. Refer to GROUP 00E, Harness

Connector Inspection (

P.00E-2

). Then go to Step 20.

STEP 4. Using scan tool MB991502, check data list item 22:
Crankshaft Position Sensor.

CAUTION

To prevent damage to scan tool MB991502, always turn the
ignition switch to the "LOCK" (OFF) position before
connecting or disconnecting scan tool MB991502.
(1) Connect scan tool MB991502 to the data link connector.
(2) Turn the ignition switch to the "ON" position.
(3) Set scan tool MB991502 to the data reading mode for item

22, Crankshaft Position Sensor.

•

The tachometer and engine speed indicated on the scan
tool should much.

(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 : Replace the ECM or PCM. Then go to Step 20.

STEP 5. Check connector B-20 at the crankshaft position
sensor for damage.
Q: Is the 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 20.

AK000546AB

CONNECTOR:C-20

AKX01177

16 PIN

MB991502

AB

AK000546AB

CONNECTOR:C-20

MULTIPORT FUEL INJECTION (MFI) DIAGNOSIS

TSB Revision

MULTIPORT FUEL INJECTION (MFI) <2.4L ENGINE>

13A-185

STEP 6. Check the sensor supply voltage at crankshaft
position sensor harness side connector B-20.
(1) Disconnect the connector B-20 and measure at the harness

side.

(2) Turn the ignition switch to the "ON" position.
(3) Measure the voltage between terminal 2 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 voltage normal?

YES : Go to Step 11.
NO : Go to Step 7.

STEP 7. Check the sensor supply voltage at ECM
connector C-60 <M/T> or PCM connector C-54 <A/T> by
backprobing
(1) Do not disconnect the ECM connector C-60 <M/T> or PCM

connector C-54 <A/T>.

(2) Disconnect the crankshaft position sensor connector B-20.
(3) Turn the ignition switch to the "ON" position.
(4) Measure the voltage between terminal 89 <M/T> or 45 <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 voltage normal?

YES : Go to Step 8.
NO : Go to Step 9.

STEP 8. Check connector C-60 at ECM <M/T> or connector
C-54 at PCM <A/T> for damage.
Q: Is the connector in good condition?

YES : Repair it because of open circuit between crankshaft

position sensor connector B-20 terminal 2 and ECM
connector C-60 terminal 89 <M/T> or PCM connector
C-54 terminal 45 <A/T>. Then go to Step 20.

NO : Repair or replace it. Refer to GROUP 00E, Harness

Connector Inspection (

P.00E-2

). Then go to Step 20.

AKX01416 AC

2 1

3

B-20 HARNESS
SIDE CONNECTOR

AK000296

7172 73 74 75 76 77 78 79 80 81

82 83 84 85 86 87 88 89 90

92

91

AC

<M/T>

C-60 CONNECTOR
HARNESS SIDE VIEW

AK000297

C-54 CONNECTOR
HARNESS SIDE VIEW

46
57
66

45
56
65

44
55

43
49

54

64

42
48
59

41
47
58

53
63

52
62

51
61

50
60

AD

<A/T>

AK000280

C-54

C-60

ECM<M/T>
OR
PCM<A/T>

CONNECTORS:C-60<M/T>,C-54<A/T>

BB

MULTIPORT FUEL INJECTION (MFI) DIAGNOSIS

TSB Revision

MULTIPORT FUEL INJECTION (MFI) <2.4L ENGINE>

13A-186

STEP 9. Check connector C-60 at ECM <M/T> or connector
C-54 at PCM <A/T> for damage.
Q: Is the connector in good condition?

YES : Go to Step 10.
NO : Repair or replace it. Refer to GROUP 00E, Harness

Connector Inspection (

P.00E-2

). Then go to Step 20.

STEP 10. Check for short circuit to ground between
crankshaft position sensor connector B-20 terminal 2 and
ECM connector C-60 terminal 89 <M/T> or PCM connector
C-54 terminal 45 <A/T>.
Q: Is the harness wire in good condition?

YES : Replace the ECM or PCM. Then go to Step 20.
NO : Repair it. Then go to Step 20.

AK000280

C-54

C-60

ECM<M/T>
OR
PCM<A/T>

CONNECTORS:C-60<M/T>,C-54<A/T>

BB

AK000546AB

CONNECTOR:C-20

AK000280

C-54

C-60

ECM<M/T>
OR
PCM<A/T>

CONNECTORS:C-60<M/T>,C-54<A/T>

BB