Mitsubishi Pajero Pinin. Manual - part 79

GDI  – 

Troubleshooting

13A-65

INSPECTION CHART FOR TROUBLE SYMPTOMS

Trouble symptom

Inspection
procedure
No.

Reference page

Communication
with MUT-

II

is

Communication with all systems is not possible.

1

13A-66

with MUT-

II

 is 

impossible.

Communication with engine-ECU only is not possible.

2

13A-66

Engine warning
lamp and 
related parts

The engine warning lamp does not illuminate right after the
ignition switch is turned to the ON position.

3

13A-67

related parts

The engine warning lamp remains illuminating and never goes
out.

4

13A-67

Starting

No initial combustion (starting impossible)

5

13A-78

Initial combustion but no complete combustion 
(starting impossible)

6

13A-70

Long time to start (improper starting)

Idling stability 
(Improper idling)

Unstable idling (Rough idling, hunting)

7

13A-71

(Improper idling)

Idling speed is high. (Improper idling speed)

8

13A-73

Idling speed is low. (Improper idling speed)

Idling stability 
(Engine stalls)

When the engine is cold, it stalls at idling. (Die out)

9

13A-74

(Engine stalls)

When the engine is hot, it stalls at idling. (Die out)

10

13A-75

The engine stalls when starting the car. (Pass out)

11

13A-77

The engine stalls when decelerating.

12

13A-78

Driving

Hesitation, sag or stumble

13

13A-79

Poor acceleration

Surge

The feeling of impact or vibration when accelerating

14

13A-80

The feeling of impact or vibration when decelerating

15

13A-81

Knocking

16

13A-81

Dieseling

17

13A-81

Too high CO and HC concentration when idling

18

13A-82

Low alternator output voltage (approx. 12.3 V)

19

13A-83

Fans (radiator fan, A/C condenser fan) are inoperative

20

13A-84

GDI ECO indi-
cator lamp sys-

GDI ECO indicator lamp does not illuminate.

21

13A-85

cator  lamp sys-
tem

GDI ECO indicator lamp remains illuminated and does not go off.

22

13A-85

GDI  – 

Troubleshooting

GDI  – 

Troubleshooting

13A-66

INSPECTION PROCEDURE FOR TROUBLE SYMPTOMS

INSPECTION PROCEDURE 1

Communication with MUT-

II

 is not possible.

(Communication with all systems is not possible.)

Probable cause

The cause is probably a defect in the power supply system (including earth) for
the diagnosis line.



Malfunction of the connector



Malfunction of the harness wire



Malfunction of MUT-

II

NG

Repair

OK

Measure at the diagnostic connector
(16-pin) B-35.



Voltage between 16 and earth
OK: System voltage

NG

Check the following connectors:
C-76, C-77

NG

Repair

OK

Check trouble symptom.

NG

Check the harness wire between the
power supply and diagnostic connector
(16-pin), and repair if necessary.

OK

Measure at the diagnostic connector
(16-pin) C-35.



Continuity between 4 and earth



Continuity between 5 and earth
OK: Continuity

NG

Check the harness wire between the
diagnostic connector (16-pin) and
earth, and repair if necessary.

OK

Replace the MUT-

II

.

Check the following connector:
C-01

NG

Check trouble symptom.

INSPECTION PROCEDURE 2

MUT-

II

 communication with engine-ECU (engine-

A/T-ECU) is impossible.

Probable cause

One of the following causes may be suspected.



No power supply to engine-ECU



Defective earth circuit of engine-ECU



Defective engine-ECU



Improper communication line between engine-ECU and MUT-

II



Malfunction of engine-ECU power supply circuit



Malfunction of engine-ECU



Open circuit between the engine-ECU and diagnosis
connector

NG

Check the harness wire between engine-ECU and diagnosis con-
nector.

NG

Repair

OK

Check trouble symptom.

Check the following connectors:
C-19, C-28, C-35, C-53, C-70

NG

Repair

OK

Check the engine-ECU power supply and earth circuit system.

(Refer to P.13A-86, INSPECTION PROCEDURE 23.)

NOTE
On vehicles with multi center display, if a malfunction cannot be resolved after the procedure above, check the multi
center display and replace if necessary. (Refer to GROUP 54 – Multi Center display.)

GDI  – 

Troubleshooting

13A-67

INSPECTION PROCEDURE 3

The engine warning lamp does not illuminate right after
the ignition switch is turned to the ON position.

Probable cause

Because there is a burnt-out bulb, the engine-ECU <M/T> or engine-A/T-ECU <A/T>
causes the engine warning lamp to illuminate for five seconds immediately after
the ignition switch is turned to ON. If the engine warning lamp does not illuminate
immediately after the ignition switch is turned to ON, one of the malfunctions listed
at right has probably occurred.



Burnt-out bulb



Defective warning lamp circuit



Malfunction of the engine-ECU <M/T>



Malfunction of the engine-A/T-ECU <A/T>

MUT-

II

 Data list

16 engine-ECU (engine-A/T-ECU) power supply voltage (Refer
to P.13A-94.)

NG

Check the engine-ECU (engine-A/T-ECU) power supply and earth
circuit system.
(Refer to P.13A-86, INSPECTION PROCEDURE 23.)

OK

Measure at the engine-ECU connector C-17.



Disconnect the connector, and measure at the harness side.



Earth the terminal No. 31.
OK: The engine warning lamp illuminates.

OK

Check the following
connector: C-17 

NG

Repair

OK

Check trouble symptom.

NG

Replace the engine-ECU

NG

Check a burnt-out bulb.

NG

Replace

OK

Measure at the combination meter connector C-06.



Disconnect the connector, and measure at the harness side.



Voltage between 1 and earth (Ignition switch: ON)
OK: System voltage

NG

Check the engine warning lamp power supply circuit, and repair
if necessary.

OK

Check the following connectors:
C-07, C-17, C-28

NG

Repair

OK

Check trouble symptom.

NG

Check the harness wire between combination meter and engine-
ECU, and repair if necessary.

INSPECTION PROCEDURE 4

The engine warning lamp remains illuminating and never
goes out.

Probable cause

In cases such as the above, the cause is probably that the engine-ECU is detecting
a problem in a sensor or actuator, or that one of the malfunctions listed at right
has occurred.



Short-circuit between the engine warning lamp and
engine-ECU



Malfunction of the engine-ECU

MUT-

II

 Self-Diag code

Are diagnosis codes displayed?

Yes

Refer to P.13A-12, INSPECTION CHART FOR DIAGNOSIS
CODES.

No

Measure at the combination meter connector C-07.



Disconnect the connector, and measure at the harness side.



Disconnect the engine-ECU connector



Continuity between 46 and earth
OK: No continuity

NG

Check the harness wire between combination meter and engine-
ECU connector, and repair if necessary.

OK

Replace the engine-ECU

GDI  – 

Troubleshooting

13A-68

INSPECTION PROCEDURE 5

No initial combustion (starting impossible)

Probable cause

This is caused by incorrect fuel supply into the combustion chamber, and improper
ignition circuit. Besides that, foreign material may be contaminated in fuel.



Malfunction of the fuel supply system



Malfunction of the ignition system



Malfunction of the engine-ECU

OK

Check ignition timing while the engine is cranking.

OK: Approx. 5



 BTDC

NG

Check that the crank angle sensor and timing belt cover are proper-
ly installed.

OK

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



Connect the connector.



Connect a timing light to the No. 1 terminal of each connector
in turn.
(Engine cranking)
OK: The timing light flashes.

NG

Check the ignition coil (incorporating power transitor) system. 
(Refer to P.13A-44, INSPECTION PROCEDURE FOR DIAGNO-
SIS CODE P0300.)

OK

Measure low fuel pressure between the fuel pump (low pressure)
and fuel pump (high pressure). (Refer to P.13A-108.)

NG

Repair

Check fuel leakage. (Refer to P.13A-99*.)

NG

Repair

OK

NG

Measure at injector driver connector A-55.



Disconnect the connector, and measure at the connector side.



Voltage between each of terminals 12, 21 and earth
(Ignition switch: ON)
OK: System voltage

Check the injector driver system. 
(Refer to P.13A-88, INSPECTION PROCEDURE 25.)

NG

OK

Inspect engine start ability by cranking the engine while the 
accelerator pedal is slightly depressed.

OK

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

OK

MUT-

II

 Data list

79 Throttle position sensor (1st channel) (Refer to P.13A-94.)

NG

Check the throttle position sensor (1st channel) system. 
(Refer to P.13A-22, INSPECTION PROCEDURE FOR DIAGNO-
SIS CODE P0120.)

OK

MUT-

II

 Data list

21 Engine coolant temperature sensor (Refer to P.13A-94.)

NG

Check the engine coolant temperature sensor system. 
(Refer to P.13A-19, INSPECTION PROCEDURE FOR DIAGNO-
SIS CODE P0115.)

OK

MUT-

II

 Data list

22 Crank angle sensor (Refer to P.13A-94.)

NG

Check the crank angle sensor system. (Refer to P.13A-47, IN-
SPECTION PROCEDURE FOR DIAGNOSIS CODE P0335.)

Yes

MUT-

II

 Actuator test

07 Fuel pump (low pressure) (Refer to P.13A-100.)

NG

Check the fuel pump (low pressure) system. 
(Refer to P.13A-91, INSPECTION PROCEDURE 29.)

OK

Does the camshaft rotate when the engine is cranking?

No

Check if the timing belt is broken or damaged.

No

MUT-

II

 Data list

16 System voltage (Refer to P.13A-94.)

NG

Check the engine control relay and ignition switch-IG system. 
(Refer to P.13A-87, INSPECTION PROCEDURE 24.)

OK

MUT-

II

 Self-Diag code

Is a diagnosis code displayed?

Yes

Refer to P.13A-12, INSPECTION CHART FOR DIAGNOSIS
CODES.

Check system voltage while the engine is cranking.
OK: 8 V or more

NG

Check the battery. (Refer to GROUP 55 – Battery.)

OK

To the next page

NOTE
*:

Refer to the ’00 PAJERO PININ Workshop Manual (Pub. No. CKRE00E1)