Mitsubishi Pajero Pinin. Manual - part 40

GDI – 

Troubleshooting

13A-26

From the previous page

OK

Measure at engine-ECU connector
C-17,19.

D

Connect the connector.

D

Voltage between terminal 51 and
earth (Ignition switch: ON)
OK: 4.0 – 5.0 V

D

Voltage between terminal 1 and
earth
Voltage between terminal 24 and
earth
Voltage between terminal 9 and
earth
Voltage between terminal 2 and
earth
(Ignition switch: ON)
OK: 8 – 11 V

OK

Check the following connectors:
C-17, C-19

NG

Repair

OK

Check trouble symptom.

NG

Replace the injector driver.

Check trouble symptom.

NG

Replace the engine-ECU.

NG

Check the following connector: A-55

OK

Check trouble symptom.

NG

Check the harness wire between the
injector driver and engine-ECU, and
repair if necessary.

NG

Repair

GDI – 

Troubleshooting

13A-27

Code No.44 Abnormal combustion

Probable cause

Range of check

D

While engine is running during lean fuel combustion

Set conditions

D

Abnormal engine speed due to mis-firing is detected by the crank angle
sensor

D

Malfunction of the ignition coil

D

Malfunction of the spark plug

D

Malfunction of the EGR valve

D

Open circuit or short-circuit in ignition primary
circuit

D

Malfunction of the engine-ECU

NG

Repair

NG

Check the harness wire between the ignition coil and the ignition
switch, and repair if necessary.

(2) NG

NG

Repair

NG

Repair

OK

Replace the engine-ECU.

(3) NG

Check the harness wire between the ignition coil and the
earth, and repair if necessary.

NG

Repair

OK

Check for air leaking into the air intake system.

D

Damaged intake manifold gasket

D

Damaged vacuum hose

D

Damaged air intake hose

D

Malfunction of the EGR valve

OK

Check the injector system (Refer to P.13A-25, INSPECTION PRO-
CEDURE FOR DIAGNOSIS CODE No.41)

NG

Check the following items in the order given.

D

Spark plugs

D

Compression pressure

OK

Check trouble symptom.

NG

Check the harness wire between the engine-ECU and the ignition
coil.

OK

Check trouble symptom.

OK

Check the following connectors:
A-09, A-10, A-11, A-12

OK

Check trouble symptom.

Check the following connector: C-17

OK

Measure at the ignition coil connectors A -09, A-10, A-11, A-12.

D

Disconnect the connector, and measure at the harness
side.

(1) Voltage between 1 and earth (Ignition switch: ON)

OK: System voltage

(2) Voltage between 3 and earth (Engine: Cranking)

OK: 0.5 – 4.0 V

(3) Continuity between 2 and earth

OK: Continuity

(1) NG

Check the following connector: C-72, C-74

Check the ignition coil (Refer to GROUP 16 – Ignition System).

NG

Replace

GDI – 

Troubleshooting

13A-28

Code No.54 Immobilizer system

Probable cause

Range of check

D

Ignition switch: ON

Set conditions

D

Improper communication between the engine-ECU and immobilizer-ECU

D

Radio interference of ID codes

D

Incorrect ID code

D

Malfunction of harness or connector

D

Malfunction of immobilizer-ECU

D

Malfunction of engine-ECU

NOTE
(1) If the ignition switches are close each other when starting the engine, radio interference may cause

this code to be displayed.

(2) This code may be displayed when registering the key ID code.

Replace the engine-ECU.

Check trouble symptom.

No

Check the following connector: 
C-19, C–29, C-62, 1

Check the immobilizer system. (Refer to GROUP 54 – Ignition
Switch and Immobilizer System.)

Check trouble symptom.

OK

Is a diagnosis code output from the immobilizer-ECU?

NG

Yes

Remove the extra ignition key.

OK

Replace

Check the harness wire between the engine-ECU and the
immobilizer-ECU.

NG

No

NG

Replace

OK

Yes

NG

Is there another ignition key near the ignition key that is inserted
in the ignition switch?

GDI – 

Troubleshooting

13A-29

Code No.56 Abnormal fuel pressure

Probable cause

Range of check

D

Ignition switch: ON

Set conditions

D

Sensor output voltage is 4.8 V or more for four seconds.

or

D

Sensor output voltage is 0.2 V or less for four seconds.

Range of check

D

After the engine is started, the following condition has been detected:
(1) Engine speed: 1,000 r/min or more
(2) Fuel pressure: 2 MPa or more

D

While engine is running

Set conditions

D

Fuel pressure is 6.9 MPa or more for four seconds.

or

D

Fuel pressure is 2 MPa or less for four seconds.

D

Malfunction of the fuel pressure sensor

D

Open circuit or short-circuited harness wire of the
fuel pressure sensor

D

Malfunction of the engine-ECU

D

Malfunction of the fuel pump (high pressure)

D

Malfunction of the fuel pressure regulator (high
pressure)

D

Clogged high-pressure fuel line

This diagnosis code is also output when air is sucked in high-pressure fuel line
due to no fuel supply.
In this case, air can be bled by letting the engine run at 2,000 r/min for at
least fifteen seconds. After the air bleeding, the diagnosis code must be erased
by the MUT-

II

.

D

Air sucking due to no fuel supply

OK

NG

D

Replace the fuel pump (high
pressure) (poor pump discharge
pressure)

D

Replace the high-pressure regula-
tor (fuel leakage at the return side).

Check trouble symptom.

NG

Check if input voltage from the fuel
pressure sensor to  engine-ECU
changes suddenly by performing an
intermittent malfunction simulation test.
(Refer to GROUP 00 – Points to Note
for Intermittent Malfunction.)

OK

Normal

NG

To the next page

MUT-

II

 Data list

74 Fuel pressure sensor
(Refer to P.13A-75.)

D

Ignition switch: ON
OK: 0 – 8 MPa

OK

MUT-

II

 Data list

74 Fuel pressure sensor
(Refer to P.13A-75.)

D

Maintain the engine speed at 2,000
r/min for at least fifteen seconds.
OK: 6.9 MPa or less

NG

D

Replace the high-pressure fuel
regulator (seized regulator).

D

Replace the high-pressure return
pipe (seized pipe).

MUT-

II

 Data list

74 Fuel pressure sensor
(Refer to P.13A-75.)

D

Engine: Idle running for at least
three minutes
OK: 4 MPa or more

OK

Erase diagnosis code No.56. (This
diagnosis code has been output due
to air sucking into high-pressure fuel
line. But that problem has been re-
solved by revving the engine at 2,000
r/min.)