Mitsubishi Galant 9G. Manual — part 776

MULTIPORT FUEL INJECTION (MFI) DIAGNOSIS

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MULTIPORT FUEL INJECTION (MFI) <2.4L ENGINE>

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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.

AK303856

1

2

AB

CONNECTOR: B-120

KNOCK SENSOR

B-120 (GR)

HARNESS
CONNECTOR:
COMPONENT SIDE

INTAKE
MANIFOLD

INTAKE
MANIFOLD

AK303857

1 2

AB

KNOCK SENSOR
CONNECTOR

MULTIPORT FUEL INJECTION (MFI) DIAGNOSIS

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MULTIPORT FUEL INJECTION (MFI) <2.4L ENGINE>

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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.

AK303804AB

MB991910

DATA LINK
CONNECTOR

MB991824

MB991827

MULTIPORT FUEL INJECTION (MFI) DIAGNOSIS

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MULTIPORT FUEL INJECTION (MFI) <2.4L ENGINE>

13A-548

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.

1

2 3

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

AK400889

1

1

RED-

WHITE

RED

GREEN-RED

B-17X

MFI
RELAY

CRANKSHAFT
POSITION
SENSOR

B-119

(MU802064)

103

4

3

3

2

2

3

POWERTRAIN
CONTROL
MODULE (PCM)

Crankshaft Position Sensor Circuit

113

B-22

B-119

B-119-1

RED-

WHITE

RED-

WHITE

BATTERY

1

2

BROWN

B-119-1

TO PCM

5 V

1 2 3

MULTIPORT FUEL INJECTION (MFI) DIAGNOSIS

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MULTIPORT FUEL INJECTION (MFI) <2.4L ENGINE>

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.

CIRCUIT OPERATION

• The crankshaft position sensor power is supplied

from the MFI relay (terminal No. 4).

• Terminal No. 3 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

.

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

.

AK301954AC

CONNECTOR: B-119-1

B-119-1 (GR)

CRANKSHAFT
POSITION
SENSOR

AK303859AB

CONNECTOR: B-119

CRANKSHAFT
POSITION SENSOR
INTERMEDIATE
CONNECTOR

GENERATOR

B-119 (GR)

AK303803AB

CONNECTOR: B-17X

MFI RELAY

B-17X

AK303043

CONNECTOR: B-22

B-22 (B)

PCM

AB

AIR CLEANER