Mitsubishi Galant 9G. Manual — part 781

MULTIPORT FUEL INJECTION (MFI) DIAGNOSIS

TSB Revision

MULTIPORT FUEL INJECTION (MFI) <2.4L ENGINE>

13A-566

DTC P0340: Camshaft Position Sensor Circuit

CAUTION

If DTC P0340 has been set, TCL related DTC
U1120 is also set. After P0340 has been diag-
nosed, don't forget to erase DTC U1120.

2

1

3

1

2

3

4

AK400890

100

99

92

91

93 94 95

96 97 98

101 102 103 104

105 106 107 108

109 110 111 112 113

RED

BLUE-

YELLOW

MFI RELAY

CAMSHAFT
POSITION
SENSOR

B-106

MU802337

104

1

4

2

3

3

POWERTRAIN
CONTROL
MODULE (PCM)

Camshaft Position Sensor Circuit

113

B-22

BROWN

B-17X

RED-

WHITE

RED-

WHITE

BATTERY

1

2

TO PCM

5 V

MULTIPORT FUEL INJECTION (MFI) DIAGNOSIS

TSB Revision

MULTIPORT FUEL INJECTION (MFI) <2.4L ENGINE>

13A-567

.

CIRCUIT OPERATION

• The camshaft position sensor power is supplied

from the MFI relay (terminal No. 4).

• Terminal No. 1 of the camshaft position sensor is

grounded with PCM (terminal No. 113).

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

tion sensor output terminal (terminal No. 2) from
the PCM (terminal No. 104). The camshaft posi-
tion sensor generates a pulse signal when the
output terminal is opened and grounded.

.

TECHNICAL DESCRIPTION

• The camshaft position sensor functions to detect

the top dead center position of the number 1 cyl-
inder and to convert that data to pulse signals
that are input to the PCM.

• When the engine is running, the camshaft posi-

tion sensor outputs a pulse signal.

• The PCM checks whether pulse signal is input

while the engine is cranking.

.

DESCRIPTIONS OF MONITOR METHODS

• Camshaft position sensor signal does not

change.

• Camshaft 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

.

AK303862AB

CONNECTOR: B-106

CAMSHAFT
POSITION
SENSOR

B-106 (B)

AK303043

CONNECTOR: B-22

B-22 (B)

PCM

AB

AIR CLEANER

AK303803AB

CONNECTOR: B-17X

MFI RELAY

B-17X

MULTIPORT FUEL INJECTION (MFI) DIAGNOSIS

TSB Revision

MULTIPORT FUEL INJECTION (MFI) <2.4L ENGINE>

13A-568

DTC SET CONDITIONS <Circuit continuity>

Logic Flow Chart

Check Conditions

• Engine speed is higher than 50 r/min.

Judgment Criteria

• Camshaft position sensor output voltage has not

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

.

START

MONITORING
CONDITIONS

END

NO

NO

NO

YES

YES

YES

MALFUNCTION

GOOD

OUTPUT SIGNAL

CHANGES

CONTINUOUS

FAILURE FOR 2secs

AK302034

MULTIPORT FUEL INJECTION (MFI) DIAGNOSIS

TSB Revision

MULTIPORT FUEL INJECTION (MFI) <2.4L ENGINE>

13A-569

DTC SET CONDITIONS <Range/Performance problem

− alignment>

Logic Flow Chart

Check Conditions

• Engine speed is higher than 50 r/min.

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.

.

OBD-II DRIVE CYCLE PATTERN

Refer to Diagnostic Function

− OBD-II Drive Cycle −

Procedure 6

− Other Monitor

P.13A-6

.

.

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

• Camshaft position sensor failed.

• Open or shorted camshaft position sensor circuit,

or harness damage, or connector damage.

• PCM failed.

DIAGNOSIS

Required Special Tool:

• MB991709: Test Harness

• MB991923: Power Plant ECU Check Harness

START

END

YES

NO

NO

YES

MALFUNCTION

GOOD

CONTINUOUS

FAILURE FOR

2secs

EXPECTED STATE

OF THE SENSOR

MONITORING
CONDITIONS?

YES

NO

AK302035