Mitsubishi Montero (2004+). Manual — part 250

MULTIPORT FUEL INJECTION (MFI) DIAGNOSIS

TSB Revision

MULTIPORT FUEL INJECTION (MFI)

13A-487

.

CIRCUIT OPERATION

• The camshaft position sensor power is supplied

from the MFI relay (terminal No. 1).

• Terminal No. 1 of the camshaft position sensor is

grounded with PCM (terminal No. 88).

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

tion sensor output terminal (terminal No. 2) from
the PCM (terminal No. 71). 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 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

.

AK200963

CAMSHAFT POSITION
SENSOR

AB

B-10(B)

CONNECTOR: B-10

AK201039

MFI RELAY

B-22X

AB

CONNECTOR: B-22X

AK201038

CONNECTOR: D-134

AD

PCM

D-134(GR)

AK201058

B-08(GR)

AB

CONNECTOR: B-08

MULTIPORT FUEL INJECTION (MFI) DIAGNOSIS

TSB Revision

MULTIPORT FUEL INJECTION (MFI)

13A-488

DTC SET CONDITIONS <Range/Performance problem

− alignment>

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

END

YES

NO

NO

YES

MALFUNCTION

GOOD

CONTINUOUS

FAILURE FOR 2secs

EXPECTED STATE

OF THE SENSOR

MONITORING
CONDITIONS?

YES

NO

AK302944

MULTIPORT FUEL INJECTION (MFI) DIAGNOSIS

TSB Revision

MULTIPORT FUEL INJECTION (MFI)

13A-489

DTC SET CONDITIONS <Circuit continuity>

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-4

.

.

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

• Camshaft position sensor failed.

• Open or shorted camshaft position sensor circuit,

harness damage, or connector damage.

• PCM failed.

START

END

NO

NO

YES

YES

MALFUNCTION

GOOD

OUTPUT SIGNAL

CHANGES

CONTINUOUS

FAILURE FOR 2secs

MONITORING

CONDITIONS?

YES

NO

AK302946

MULTIPORT FUEL INJECTION (MFI) DIAGNOSIS

TSB Revision

MULTIPORT FUEL INJECTION (MFI)

13A-490

DIAGNOSIS

Required Special Tool:

• MB991658: Test Harness Set

STEP 1. Using the oscilloscope, check the camshaft
position sensor.
(1) Disconnect the camshaft position sensor intermediate

connector, and connect the test harness special tool
(MB991658) in between. (All terminals should be
connected.)

(2) Connect the oscilloscope probe to terminal No. 2 of the

camshaft position sensor intermediate connector by
backprobing.
NOTE: When measuring with the PCM side connector, con-
nect an oscilloscope probe to terminal No. 71 by
backprobing.

(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 2..
NO : Go to Step 4.

STEP 2. Check connector B-08 at camshaft position
sensor intermediate connector 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 21.

AK302432

3 2 1

B-08(GR)

3 2 1

AB

CONNECTOR: B-08

HARNESS CONNECTOR:
COMPONENT SIDE

3 2 1

AK102978AC

CAMSHAFT POSITION
SENSOR INTERMEDIATE
CONNECTOR

MB991658

OSCILLOSCOPE

3

2

1

AKX01420AB

2 ENGINE REVOLUTIONS

NORMAL WAVEFORM

5V

AK302432

3 2 1

B-08(GR)

3 2 1

AB

CONNECTOR: B-08

HARNESS CONNECTOR:
COMPONENT SIDE

3 2 1