Mitsubishi Pajero Pinin. Manual - part 115

MPI <4G9> – 

Troubleshooting

13C-46

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

13C-47

with MUT-

II

 is 

impossible.

Communication with engine-ECU only is not possible.

2

13C-47

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

13C48

related parts

The engine warning lamp remains illuminating and never goes
out.

4

13C-48

Starting

No initial combustion (starting impossible)

5

13C-49

Initial combustion but no complete combustion 
(starting impossible)

6

13C-50

Long time to start (improper starting)

7

13C-51

Idling stability 
(Improper idling)

Unstable idling (Rough idling, hunting)

8

13C-52

(Improper idling)

Idling speed is high. (Improper idling speed)

9

13C-54

Idling speed is low. (Improper idling speed)

10

13C-54

Idling stability 
(Engine stalls)

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

11

13C-55

(Engine stalls)

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

12

13C-56

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

13

13C-58

The engine stalls when decelerating.

14

13C-58

Driving

Hesitation, sag or stumble

15

13C-59

The feeling of impact or vibration when accelerating

16

13C-60

The feeling of impact or vibration when decelerating

17

13C-60

Poor acceleration

18

13C-61

Surge

19

13C-63

Knocking

20

13C-64

Dieseling

21

13C-64

Too high CO and HC concentration when idling

22

13C-65

Idling speed is improper when A/C is operating

23

13C-66

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

24

13C-67

MPI <4G9> – 

Troubleshooting

13C-47

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.

D

Malfunction of the connector

D

Malfunction of the harness wire

OK

Replace the MUT-

II

.

OK

Check the trouble symptom.

NG

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

NG

Repair

NG

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

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

D

Voltage between 16 and earth
OK: Battery voltage

OK

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

D

Continuity between 4 and earth

D

Continuity between 5 and earth
OK: Continuity

NG

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

Check the following connectors: C-01

OK

NG

Repair

INSPECTION PROCEDURE 2

MUT-

II

 communication with engine-ECU is impossible.

Probable cause

One of the following causes may be suspected.

D

No power supply to engine-ECU.

D

Defective earth circuit of engine-ECU.

D

Defective engine-ECU.

D

Improper communication line between engine-ECU and MUT-

II

D

Malfunction of engine-ECU power supply circuit

D

Malfunction of engine-ECU

D

Open circuit between the engine-ECU and diagnosis
connector

OK

Check the engine-ECU power supply and earth circuit system.
(Refer to P.13C-68, INSPECTION PROCEDURE 25.)

NG

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

NG

Repair

OK

Check the trouble symptom.

Check the following connectors:
C-35, B-70, C-53, C-28, C-89

NG

Repair

MPI <4G9> – 

Troubleshooting

13C-48

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 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.

D

Burnt-out bulb

D

Defective warning lamp circuit

D

Malfunction of the engine-ECU

OK

Check the trouble symptom.

NG

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

OK

Check the following connectors:
C-07, C-28, C-88

NG

Repair

NG

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

OK

Measure at the combination meter connector C-07.

D

Disconnect the connector, and measure at the harness side.

D

Voltage between 46 and earth (Ignition switch: ON)
OK: System voltage

NG

Check a burnt-out bulb.

NG

Replace

NG

Replace the engine-ECU.

OK

Check the trouble symptom.

OK

Check the following
connector: C-88

NG

Repair

OK

Measure at the engine-ECU connector C-88.

D

Disconnect the connector, and measure at the harness side.

D

Earth the terminal No. 36.
OK: The engine warning lamp illuminates.

MUT-

II

 Data list

16 engine-ECU power supply voltage (Refer to P.13C-75.)

NG

Check the engine-ECU power supply and earth circuit.
(Refer to P.13C-68, INSPECTION PROCEDURE 25.)

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.

D

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

D

Malfunction of the engine-ECU

OK

Replace the engine-ECU.

No

Measure at the combination meter connector C-07.

D

Disconnect the connector, and measure at the harness side.

D

Disconnect the engine-ECU connector

D

Continuity between 46 and earth
OK: No continuity

NG

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

MUT-

II

 Self-Diag code

Are diagnosis codes displayed?

Yes

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

MPI <4G9> – 

Troubleshooting

13C-49

INSPECTION PROCEDURE 5

No initial combustion (starting impossible)

Probable cause

In cases such as the above, the cause is probably that a spark plug is defective,
or that the supply of fuel to the combustion chamber is defective.
In addition, foreign materials (water, kerosene, etc.) may be mixed with the fuel.

D

Malfunction of the ignition system

D

Malfunction of the fuel pump system

D

Malfunction of the injectors

D

Malfunction of the engine-ECU

D

Malfunction of the immobilizer system

D

Foreign materials in fuel

OK

Check the following items.

D

Check the ignition coil, spark plugs, spark plug cables.

D

Check if the injectors are clogged.

D

Check if foreign materials (water, alcohol, etc.) got into fuel.

D

Check the compression pressure.

D

Check the immobilizer system.

Yes

Measure at the ignition coil connectors A-13 and A-14

D

Connectors connected

D

Check by connecting the timing light to terminal 1 of each
connector (Engine: Cranking)
OK: The timing light flashes.

No

Check the ignition circuit system. (Refer to P.13C-72, INSPECTION
PROCEDURE 30.)

OK

Can any sound be heard from the injectors when cranking?

No

Check the injector system. (Refer to P.13C-30, INSPECTION PRO-
CEDURE FOR DIAGNOSIS CODE P0201, P0202, P0203,
P0204.)

OK

MUT-

II

 Data list

21 Engine coolant temperature sensor (Refer to P.13C-75.)

NG

Check the engine coolant temperature sensor system.
(Refer to P.13C-20, INSPECTION PROCEDURE FOR DIAGNO-
SIS CODE P0115.)

OK

MUT-

II

 Actuator test

07 Fuel pump (Refer to P.13C-79.)

NG

Check the fuel pump system.
(Refer to P.13C-69, INSPECTION PROCEDURE 27.)

No

MUT-

II

 Data list

22 Crank angle sensor

OK: Cranking speed is displayed

No

Check the crank angle sensor system. (Refer to P.13A-113, IN-
SPECTION PROCEDURE FOR DIAGNOSIS CODE P0335.)

Yes

MUT-

II

 Self-Diag code

Are diagnosis codes displayed?

Yes

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

OK

Does the camshaft rotate at the engine cranking?
(When oil filler cap is removed.)

No

Check timing belt for breakage.

No

MUT-

II

 Data list

16 Power supply voltage (Refer to P.13C-75.)

NG

Check the power supply and ignition switch-IG system. 
(Refer to P.13C-69, INSPECTION PROCEDURE 26.)

OK

Is immobilizer-ECU diagnosis code displayed?

Yes

Check the immobilizer. 
(Refer to GROUP 54 – Ignition Key and Immobilizer.)

Check battery voltage when cranking.

OK: 8 V or higher

NG

Check the battery. (Refer to GROUP 54 – Battery.)