Mitsubishi Eclipse. Manual - part 230

MULTIPORT FUEL INJECTION (MFI) DIAGNOSIS

TSB Revision

MULTIPORT FUEL INJECTION (MFI) <2.4L>

13A-413

STEP 1. Using scan tool MB991958, check data list item 22: 
Crankshaft Position Sensor.

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 

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) Disconnect the crankshaft position sensor connector B-20 

and connect the test harness special tool (MD998478) in 
between.

(2) Connect the oscilloscope probe to terminal No. 2 of the 

crankshaft position sensor by backprobing.
NOTE: Connect the oscilloscope probe to terminal No. 89 
<M/T> or terminal No. 45 <A/T> by backprobing when mea-
suring 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 illus-

tration.

(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.

AK300810

AB

MB991911

16-PIN

MB991827

MB991824 

AK102979AB

MD998478

1 2

3

CRANKSHAFT POSITION
SENSOR CONNECTOR

OSCILLOSCOPE

AK101409

5V

2 ENGINE REVOLUTIONS

NORMAL WAVEFORM

AB

MULTIPORT FUEL INJECTION (MFI) DIAGNOSIS

TSB Revision

MULTIPORT FUEL INJECTION (MFI) <2.4L>

13A-414

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 21.

STEP 4. Using scan tool MB991958, check data list item 22: 
Crankshaft Position Sensor.

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) Turn the ignition switch to the "ON" position.
(3) Set scan tool MB991958 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 21.

AK300428

1

2

3

AB

B-20 (B)

CRANKSHAFT
POSITION
SENSOR

CONNECTOR: B-20

HARNESS CONNECTOR:
COMPONENT SIDE

AK300810

AB

MB991911

16-PIN

MB991827

MB991824 

MULTIPORT FUEL INJECTION (MFI) DIAGNOSIS

TSB Revision

MULTIPORT FUEL INJECTION (MFI) <2.4L>

13A-415

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 21.

AK300428

1

2

3

AB

B-20 (B)

CRANKSHAFT
POSITION
SENSOR

CONNECTOR: B-20

HARNESS CONNECTOR:
COMPONENT SIDE

MULTIPORT FUEL INJECTION (MFI) DIAGNOSIS

TSB Revision

MULTIPORT FUEL INJECTION (MFI) <2.4L>

13A-416

STEP 6. Measure 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 No. 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 measured voltage between 4.8 and 5.2 volts?

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

AK300428

1

2

3

AB

B-20 (B)

CRANKSHAFT
POSITION
SENSOR

CONNECTOR: B-20

HARNESS CONNECTOR:
COMPONENT SIDE

AKX01416 AN

2 1

3

B-20 HARNESS 
CONNECTOR: 
COMPONENT SIDE