Mitsubishi Galant. Manual — part 256

MULTIPORT FUEL INJECTION(MFI) DIAGNOSIS

TSB Revision

MULTIPORT FUEL INJECTION (MFI) <3.0L>

13B-249

DTC P0340: Camshaft Position Sensor Circuit Malfunction

AK000513

4

3

2

6

5

7

1

2

3 4

1

RED-

WHITE

RED-

WHITE

RED-

WHITE

RED

RED-WHITE

BLA

CK

POWERTRAIN CONTROL
MODULE(PCM)

5V

1

7

2

3

4

6

5

BATTERY

CAMSHAFT POSITION SENSOR
(BUILT INTO DISTRIBUTOR)

MFI
RELAY

B-27
(MU802054)

A-21X

56

C-40
(MU803781)

42 43
48 49 50 51 52 53 54 55 56 57

46

45

44

58 59

60 61 62 63

64 65 66

47

41

MULTIPORT FUEL INJECTION(MFI) DIAGNOSIS

TSB Revision

MULTIPORT FUEL INJECTION (MFI) <3.0L>

13B-250

CIRCUIT OPERATION

•

The camshaft position sensor power is supplied
from the MFI relay (terminal 1). Ground is
provided through terminal 7 to chassis ground.

•

A 5-volt voltage is applied on the camshaft
position sensor output terminal (terminal 5) from
the PCM (terminal 56). The camshaft position
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
cylinder and to convert that data to pulse signals
that are input to the PCM.

•

When the engine is running, the camshaft
position sensor outputs a pulse signal.

•

The PCM checks whether pulse signal is input
while the engine is cranking.

DTC SET CONDITIONS

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.

Check Conditions

•

Engine speed is higher than 50 r/min.

Judgment Criteria

•

Normal signal pattern has not been input for
cylinder identification from the crankshaft position
sensor signal and camshaft position sensor
signal for 2 seconds.

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 loose connector.

•

PCM failed.

AK000619 AD

CONNECTOR:B-27

AK000555AB

CONNECTOR : A-21X

MFI RELAY

AK000280

CONNECTOR : C-40

PCM

AV

MULTIPORT FUEL INJECTION(MFI) DIAGNOSIS

TSB Revision

MULTIPORT FUEL INJECTION (MFI) <3.0L>

13B-251

DIAGNOSIS

STEP 1. Using the oscilloscope, check the camshaft
position sensor.
(1) Disconnect the camshaft position sensor connector B-22,

and connect test harness special tool (MB991348) in
between. (All terminals should be connected.)

(2) Connect the oscilloscope probe to the camshaft position

sensor side connector terminal 5.

NOTE: When measuring with the PCM side connector,
connect an oscilloscope probe to terminal 56.

(3) Start the engine and run at idle.
(4) Check the waveform.

•

The waveform should show a pattern similar to the
illustration.

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

Q: Is the waveform normal?

YES : Go to Step 2.
NO : Go to Step 4.

STEP 2. Check connector B-22 at camshaft position
sensor for damage.
Q: Is the connector in good condition?

YES : Go to Step 3.
NO : Repair or replace it. Refer to GROUP 00E, Harness

Connector Inspection (

P.00E-2

). Then go to Step 18.

STEP 3. Check the trouble symptoms.
(1) Carry out a test drive with the drive cycle pattern. Refer to,

Procedure 6

−

Other Monitor(

P.13B-4

).

(2) Check the diagnostic trouble code (DTC).

Q: Is the DTC P0340 is output?

YES : Replace the PCM. Then go to Step 18.
NO : It can be assumed that this malfunction is intermittent.

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

P.00-8

).

AK000061

1 2 3 4 5 6 7

OSCILLOSCOPE

CAMSHAFT POSITION
SENSOR CONNECTOR

OSCILLO-

SCOPE

PROBE

AB

AKX01420AB

2 ENGINE REVOLUTIONS

NORMAL WAVEFORM

5V

AK000619 AD

CONNECTOR:B-27

MULTIPORT FUEL INJECTION(MFI) DIAGNOSIS

TSB Revision

MULTIPORT FUEL INJECTION (MFI) <3.0L>

13B-252

STEP 4. Check connector B-22 at camshaft position
sensor for damage.
Q: Is the connector in good condition?

YES : Go to Step 5.
NO : Repair or replace it. Refer to GROUP 00E, Harness

Connector Inspection (

P.00E-2

). Then go to Step 18.

STEP 5. Check the sensor supply voltage at camshaft
position sensor connector B-22.
(1) Disconnect the connector B-22 and measure at the harness

side.

(2) Turn the ignition switch to the "ON" position.
(3) Measure the voltage between terminal 5 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 voltage normal?

YES : Go to Step 10.
NO : Go to Step 6.

STEP 6. Check the sensor supply voltage at PCM
connector C-115 by backprobing
(1) Do not disconnect the PCM connector C-115.
(2) Disconnect the camshaft position sensor connector B-22.
(3) Turn the ignition switch to the "ON" position.
(4) Measure the voltage between terminal 56 and ground by

backprobing.

•

Voltage should be between 4.8 and 5.2 volts.

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

Q: Is the voltage normal?

YES : Go to Step 7.
NO : Go to Step 8.

AK000619 AD

CONNECTOR:B-27

AK000250AC

7 6 5 4 3 2 1

B-27 HARNESS
SIDE CONNECTOR

AK000318

C-40 CONNECTOR
HARNESS SIDE VIEW

46
57
66

45
56

44
55

43
49

54

64

42
48
59

41
47
58

53
63

52
62

51
61

50
60

AC