Mitsubishi Galant (2004+). Manual - part 1223

MULTIPORT FUEL INJECTION (MFI) DIAGNOSIS

TSB Revision

MULTIPORT FUEL INJECTION (MFI) <3.8L ENGINE>

13B-585

MONITOR EXECUTION CONDITIONS (Other 
monitor and Sensor)

Other Monitor (There is no temporary DTC stored 

in memory for the item monitored below)

• Not applicable

Sensor (The sensor below is determined to be 

normal)

• Not applicable

.

DTC SET CONDITIONS <Range/Performance problem - Alignment>

Logic Flow Chart

.

Check Conditions, Judgment Criteria

• Normal signal pattern has not been input for cyl-

inder identification from the crankshaft position 
sensor signal and camshaft position sensor sig-
nal for 2 seconds.

.

START

END

YES

NO

NO

YES

MALFUNCTION

GOOD

CONTINUOUS

FAILURE FOR 2secs

EXPECTED STATE

OF THE SENSOR

MONITORING 
CONDITIONS?

YES

NO

AK302393

MULTIPORT FUEL INJECTION (MFI) DIAGNOSIS

TSB Revision

MULTIPORT FUEL INJECTION (MFI) <3.8L ENGINE>

13B-586

DTC SET CONDITIONS <Range/Performance problem - Circuit continuity>

Logic Flow Chart

.

Check Conditions

• Engine is being cranked.

Judgment Criteria

• Crankshaft position sensor output voltage has not 

changed (no pulse signal is input) for 2 seconds.

.

OBD-II DRIVE CYCLE PATTERN
Refer to Diagnostic Function 

− OBD-II Drive Cycle − 

Procedure 6 

− Other Monitor 

P.13B-5

.

.

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

• Crankshaft position sensor failed.

• Open or shorted crankshaft position sensor cir-

cuit, or harness damage, or connector damage.

• PCM failed.

START

END

NO

NO

YES

YES

MALFUNCTION

GOOD

OUTPUT SIGNAL

CHANGES

CONTINUOUS

FAILURE FOR 2secs

CRANKING

SWITCH ON

YES

NO

AK302402

MULTIPORT FUEL INJECTION (MFI) DIAGNOSIS

TSB Revision

MULTIPORT FUEL INJECTION (MFI) <3.8L ENGINE>

13B-587

DIAGNOSIS

Required Special Tools:

• Scan Tool (MUT-III Sub Assembly)

• MB991824: V.C.I.

• MB991827: USB Cable

• MB991910: Main Harness A

• MD998478: Test Harness (3pin, triangle)

• MB991923: Power Plant ECU Check Harness

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 match.

(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 IN GROUP 00, How to Use 
Troubleshooting/Inspection Service Points 

P.00-6

.

NO :  Go to Step 2.

AC305412

AB

MB991910

DATA LINK

CONNECTOR

MB991824

MB991827

MULTIPORT FUEL INJECTION (MFI) DIAGNOSIS

TSB Revision

MULTIPORT FUEL INJECTION (MFI) <3.8L ENGINE>

13B-588

STEP 2. Using the oscilloscope, check the crankshaft 
position sensor.

(1) Disconnect the crankshaft position sensor connector B-119, 

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

(2) Connect the oscilloscope probe to crankshaft position 

sensor connector terminal No. 2 (black clip of special tool).
NOTE: When measuring with the PCM side connector, dis-
connect the all PCM connectors and connect check har-
ness special tool (MB991923) between the separated 
connectors. then connector the oscilloscope probe to the 
check harness connector terminal No. 103.

(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.

AK303123

1

2

3

CRANKSHAFT
POSITION
SENSOR

AB

CRANKSHAFT
SPROCKET

CONNECTOR: B-119

B-119 (B)

HARNESS
CONNECTOR:
COMPONENT SIDE

AK102979AB

MD998478

1 2

3

CRANKSHAFT POSITION
SENSOR CONNECTOR

OSCILLOSCOPE

AK302211

5V

NORMAL WAVEFORM

AB