Mitsubishi Galant (2004+). Manual - part 1222

MULTIPORT FUEL INJECTION (MFI) DIAGNOSIS

TSB Revision

MULTIPORT FUEL INJECTION (MFI) <3.8L ENGINE>

13B-581

STEP 5. Check the knock sensor.

(1) Disconnect the knock sensor connector B-120.
(2) Start the engine and run at idle.

(3) Measure the voltage between knock sensor side connector 

terminal No. 1 (output) and No. 2 (ground).

(4) Gradually increase the engine speed.

• The voltage increases with the increase in the engine 

speed.

(5) Turn the ignition switch to the "LOCK"(OFF) position.
Q: Is the sensor operating properly?

YES : Replace the PCM. Then go to Step 6.
NO :  Replace the knock sensor. Then go to Step 6.

AK303120

1

2

KNOCK SENSOR

AB

CONNECTOR: B-120

B-120 (GR)

HARNESS
CONNECTOR:
COMPONENT SIDE

AK303857

1 2

AB

KNOCK SENSOR 
CONNECTOR

MULTIPORT FUEL INJECTION (MFI) DIAGNOSIS

TSB Revision

MULTIPORT FUEL INJECTION (MFI) <3.8L ENGINE>

13B-582

STEP 6. 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) Turn the ignition switch to the "ON" position.
(3) Erase the DTC.
(4) Test drive under the following conditions:

• Engine speed: 3000 − 5000r/min

• Engine load: 40% or more

• Drive a minimum of 3 seconds after the above condi-

tions have been met.

(5) After completing the test drive, read the DTC.Turn the 

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

Q: Is DTC P0325 set?

YES : Retry the troubleshooting.
NO :  The inspection is complete.

AC305412

AB

MB991910

DATA LINK

CONNECTOR

MB991824

MB991827

MULTIPORT FUEL INJECTION (MFI) DIAGNOSIS

TSB Revision

MULTIPORT FUEL INJECTION (MFI) <3.8L ENGINE>

13B-583

DTC P0335: Crankshaft Position Sensor Circuit

CAUTION

If DTC P0335 has been set, TCL related DTC 
U1120 is also set. After P0335 has been diag-
nosed, don't forget to erase DTC U1120.

RED-

WHITE

RED-

WHITE

RED

AK302857

BR

O

W

N

GREEN-RED

MFI RELAY

BATTERY

103

113

1

2

4

B-17X

5V

POWERTRAIN
CONTROL
MODULE (PCM)

3

1 2

B-119

(MU802603)

3

2

1

3

CRANKSHAFT
POSITION
SENSOR

Crankshaft Position Sensor Circuit

B-22

RED-

WHITE

1

2

3

4

100

99

92

91

93 94 95

96 97 98

101 102 103 104

105 106 107 108

109 110 111 112 113

MULTIPORT FUEL INJECTION (MFI) DIAGNOSIS

TSB Revision

MULTIPORT FUEL INJECTION (MFI) <3.8L ENGINE>

13B-584

.

CIRCUIT OPERATION

• The crankshaft position sensor power is supplied 

from the MFI relay (terminal No. 4).

• Terminal No. 1 of the crankshaft position sensor 

is grounded with PCM (terminal No. 113).

• A 5-volt voltage is applied on the crankshaft posi-

tion sensor output terminal (terminal No. 2) from 
the PCM (terminal No. 103). The crankshaft posi-
tion sensor generates a pulse signal when the 
output terminal is opened and grounded.

.

TECHNICAL DESCRIPTION

• The crankshaft position sensor detects the crank 

angle (position) of each cylinder, and converts 
that data to pulse signals, then which are input to 
the PCM.

• When the engine is running, the crankshaft posi-

tion sensor outputs a pulse signal.

• The PCM checks whether pulse signal is input 

while the engine is cranking.

.

DESCRIPTIONS OF MONITOR METHODS

• Crankshaft position sensor signal does not 

change.

• Crankshaft position sensor signal is not normal 

pattern.

.

MONITOR EXECUTION
Continuous

.

AK303122

CRANKSHAFT
POSITION
SENSOR

AB

CRANKSHAFT
SPROCKET

CONNECTOR: B-119

B-119 (B)

AK303043

CONNECTOR: B-22

B-22 (B)

PCM

AB

AIR CLEANER

1

2

3

4

1

2

3

4

1

2

3

4

1

2

3

4

AK303014

CONNECTOR: B-17X

MFI RELAY

MFI RELAY

FRONT OF VEHICLE

B-17X

AB