Mitsubishi Pajero Pinin. Manual - part 47

GDI – 

Troubleshooting

13A-54

INSPECTION PROCEDURE 12

The engine stalls when decelerating.

Probable cause

The cause is probably an improper air/fuel ratio due to a faulty EGR system, or
poor intake air volume due to a faulty electronic-controlled throttle valve system.

D

Malfunction of the electronic-controlled throttle valve
system

D

Malfunction of the EGR valve

Have the battery terminals been disconnected recently?

Yes

Warm up the engine, and then let it run at idle for approx. ten
minutes.

No

MUT-

II

 Self-Diag code

Is a diagnosis code displayed?

Yes

Refer to P.13A-14, INSPECTION CHART FOR DIAGNOSIS
CODES.

No

MUT-

II

 Data list

26 Accelerator pedal position switch (Refer to P.13A-73.)

NG

Check the accelerator pedal position switch. (Refer to P.13A-65,
INSPECTION PROCEDURE 27.)

OK

MUT-

II

 Data list

79 Throttle position sensor (1st channel) (Refer to P.13A-75.)

NG

Check the throttle valve position feedback system. (Refer to
P.13A-37, INSPECTION PROCEDURE FOR DIAGNOSIS CODE
92.)

OK

MUT-

II

 Data list

68 EGR valve (Refer to P.13A-74.)

NG

Check the EGR valve system. (Refer to P.13A-67, INSPECTION
PROCEDURE 29.)

OK

Check ignition coil spark for each cylinder.
(1) Remove the ignition coil.
(2) Install a new spark plug to the removed ignition coil.
(3) Disconnect the injector intermediate connector.

Caution
Never touch the connector terminal as approx. 100 V is
applied to the injector, or you are seriously injured.

(4) Earth the spark plug electrode securely.
(5) Check that the spark plug ignites when the engine is cranked.

NG

Replace the ignition coil.

OK

Check all the following items:

D

Spark plug

D

Clean around the throttle valve (Refer to P.13A-92.)

GDI – 

Troubleshooting

13A-55

INSPECTION PROCEDURE 13

Hesitation, sag, stumble, poor acceleration or surge

Probable cause

The cause is probably a malfunction of the ignition system, electronic-controlled
throttle valve system, compression pressure, etc.

D

Malfunction of the ignition system

D

Malfunction of the air/fuel ratio control system

D

Malfunction of the electronic-controlled throttle valve
system

D

Improper compression pressure

D

Air stuck in the air intake system

MUT-

II

 Self-Diag code

Is a diagnosis code displayed?

Yes

Refer to P.13A-14, INSPECTION CHART FOR DIAGNOSIS
CODES.

NO

NG

Check the accelerator pedal position switch. (Refer to P.13A-65,
INSPECTION PROCEDURE 27.)

OK

MUT-

II

 Data list

13 Intake air temperature sensor (Refer to P.13A-71.)

NG

Check the intake air temperature sensor. (Refer to P.13A-17, IN-
SPECTION PROCEDURE FOR DIAGNOSIS CODE 13.)

OK

MUT-

II

 Data list

25 Barometric pressure sensor (Refer to P.13A-73.)

NG

Check the barometric pressure sensor. (Refer to P.13A-23, IN-
SPECTION PROCEDURE FOR DIAGNOSIS CODE 25.)

OK

MUT-

II

 Data list

21 Engine coolant temperature sensor (Refer to P.13A-72.)

NG

Check the engine coolant temperature sensor. (Refer to P.13A-19,
INSPECTION PROCEDURE FOR DIAGNOSIS CODE 21.)

OK

MUT-

II

 Data list

79 Throttle position sensor (1st channel) (Refer to P.13A-75.)

NG

Check the throttle valve position feedback system. (Refer to
P.13A-38, INSPECTION PROCEDURE FOR DIAGNOSIS CODE
99.)

OK

MUT-

II

 Data list

11 Oxygen sensor

OK: 0 – 400 mV and 600 – 1,000 mV alternates when the

engine is idling (wait for four minutes after the engine
started).

NG

Measure fuel high-pressure between the fuel pump (high pressure)
and injector. (Refer to P.13A-97.)

OK

MUT-

II

 Data list

11 Oxygen sensor

OK: 600 – 1,000 mV when the engine is suddenly raced

NG

Check the oxygen sensor system. (Refer to P.13A-15, INSPEC-
TION PROCEDURE FOR DIAGNOSIS CODE 11.)

OK

Check that air is sucked in the air intake system.

D

Broken intake manifold gasket

D

Damaged vacuum hose

D

Damaged air intake hose

OK

MUT-

II

 Data list

68 EGR valve (Refer to P.13A-74.)

NG

Check the EGR valve system. (Refer to P.13A-67, INSPECTION
PROCEDURE 29.)

OK

MUT-

II

 Actuator test

08 Purge control solenoid valve (Refer to P.13A-76.)

NG

Check the purge control solenoid valve. (Refer to P.13A-68, IN-
SPECTION PROCEDURE 30.)

OK

To the next page

MUT-

II

 Data list

26 Accelerator pedal position switch (Refer to P.13A-73.)

Check ignition timing. (Refer to GROUP 11A – Engine Adjustment.)

Check that the crank angle sensor and timing belt cover are
properly installed.

NG

OK

GDI – 

Troubleshooting

13A-56

From the previous page

OK

Measure high fuel pressure between the fuel pump (high pressure)
and injector. (Refer to P.13A-97.)

NG

Repair

OK

Check ignition coil spark for each cylinder.
(1) Remove the ignition coil.
(2) Install a new spark plug to the removed ignition coil.
(3) Disconnect the injector intermediate connector.

Caution
Never touch the connector terminal as approx. 100 V is
applied to the injector, or you are seriously injured.

(4) Earth the spark plug electrode securely.
(5) Check that the spark plug ignites when the engine is cranked.

NG

Replace the ignition coil.

OK

Check all the following items:

D

Spark plug

D

EGR system

D

Compression pressure

D

Clogged fuel filter, fuel line

NG

Check trouble symptom.

Replace the injector.

OK

INSPECTION PROCEDURE 14

The feeling of impact when accelerating

Probable cause

The cause is probably an ignition leak being generated in line with an increase
in the spark plug request voltage during acceleration.

D

Malfunction of the ignition system

NG

Replace the ignition coil.

MUT-

II

 Self-Diag code

Is a diagnosis code displayed?

Yes

(Refer to P.13A-14, INSPECTION CHART FOR DIAGNOSIS
CODES.)

No

MUT-

II

 Data list

79 Throttle position sensor (1st channel) (Refer to P.13A-75.)

NG

Check the throttle valve position feedback system. (Refer to
P.13A-37, INSPECTION PROCEDURE FOR DIAGNOSIS CODE
92.)

OK

Check ignition coil spark for each cylinder.
(1) Remove the ignition coil.
(2) Install a new spark plug to the removed ignition coil.
(3) Disconnect the injector intermediate connector.

Caution
Never touch the connector terminal as approx. 100 V is
applied to the injector, or you are seriously injured.

(4) Earth the spark plug electrode securely.
(5) Check that the spark plug ignites when the engine is cranked.

OK

Check all the following items:

D

Spark plug

D

Ignition current leak

GDI – 

Troubleshooting

13A-57

INSPECTION PROCEDURE 15

The feeling of impact when decelerating

Probable cause

The cause is probably insufficient intake air due to a faulty electronic-controlled
throttle valve system.

D

Malfunction of the electronic-controlled throttle valve
system

MUT-

II

 Self-Diag code

Is a diagnosis code displayed?

Yes

Refer to P.13A-14, INSPECTION CHART FOR DIAGNOSIS
CODES.

No

MUT-

II

Data list

79 Throttle position sensor (1st channel) (Refer to P.13A-75.)

NG

Check the throttle valve position feedback system. (Refer to
P.13A-37, INSPECTION PROCEDURE FOR DIAGNOSIS CODE
92.)

OK

MUT-

II

 Data list

26 Accelerator pedal position switch (Refer to P.13A-73.)

NG

Check the accelerator pedal position switch system. (Refer to
P.13A-65, INSPECTION PROCEDURE 27.)

OK

Clean around the throttle valve. (Refer to P.13A-92.)

INSPECTION PROCEDURE 16

Knocking

Probable cause

The cause is probably incorrect detonation control or improper heat range of the
spark plugs.

D

Malfunction of the detonation sensor

D

Improper heat range of the spark plugs

MUT-

II

 Self-Diag code

Is a diagnosis code displayed?

Yes

Refer to P.13A-14, INSPECTION CHART FOR DIAGNOSIS
CODES.

No

Does knocking occur when the vehicle is driven with the detonation
sensor disconnected?
(At this time, use the MUT-

II

 to check whether the ignition timing

is retarded from when the detonation sensor connector is con-
nected.)

No

Check the detonation sensor system. (Refer to P.13A-24, INSPEC-
TION PROCEDURE FOR DIAGNOSIS CODE 31.)

Yes

Check all the following items:

D

Spark plug

D

Foreign material (such as water or kerosine) entered the fuel
lines

INSPECTION PROCEDURE 17

Run-on (dieseling)

Probable cause

The cause is probably fuel leak from injector(s)

D

Malfunction of the injector

Replace the injector.