Mitsubishi Pajero Pinin. Manual - part 110

 

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Mitsubishi Pajero Pinin. Manual - part 110

 

 

MPI <4G9> – 

Troubleshooting

13C-26

Code No. P0135 Oxygen sensor heater (front) system
<sensor 1>

Probable cause

Range of Check

D

The engine coolant temperature is approx. 20

_

C or more.

D

The oxygen sensor heater (front) remains on.

D

The engine speed is 50 r/min or more.

D

Battery voltage is 11 – 16 V.

Set Conditions

D

The current, which flows through the oxygen sensor heater (front), is 0.2 A
or less or 3.5 A or more for six seconds.

D

Malfunction of oxygen sensor heater (front)

D

Open or short circuit in the oxygen sensor heater
(front) circuit or loose connector contact

D

Malfunction of engine-ECU

NG

Replace the engine-ECU.

OK

Check the trouble symptoms.

OK

Transient malfunction
(Refer to GROUP 00 – Points to
Note for Intermittent Malfunctions.)

OK

Check the harness wires between
the oxygen sensor (front) and the
engine-ECU and between the
oxygen sensor (front) and the
engine control relay.

NG

Repair

OK

Check the following connector
C-89

NG

Repair

OK

Check the harness wire between
the oxygen sensor (front) and the
engine-ECU, and repair if necessary.

Repair

NG

Check the following connectors:
A-67, C-89

NG

OK

Measure at engine-ECU connector
C-89.

D

Measure the voltage at the
engine-ECU terminal.

D

Ignition switch: ON

D

Voltage between terminal 60 and
earth
OK: System voltage

OK

Check the harness wires between
the oxygen sensor (front) and the
engine control relay, and repair if
necessary.

Repair

NG

Check the following connectors:
A-36, A-43X

NG

OK

Measure at oxygen sensor (front)
connector A-67.

D

Disconnect the connector and
measure at the harness side.

D

Ignition switch: ON

D

Voltage between terminal 1 and
earth
OK: System voltage

OK

Check the following connector:
A-67

NG

Repair

Measure at oxygen sensor (front)
connector A-67.

D

Disconnect the connector and
measure at the harness side.

D

Resistance between terminals 1
and 3
OK: 4.5  – 8.0 

NG

Replace

MPI <4G9> – 

Troubleshooting

MPI <4G9> – 

Troubleshooting

13C-27

Code No. P0136 Oxygen sensor (rear) system <sensor
2>

Probable cause

Range of Check

D

Three minutes have been passed since the engine has been started.

D

The engine coolant temperature is approx. 80

_

C or more.

D

Intake air temperature is 20 – 50

_

C

D

Engine speed is 1,200 r/min or more

D

Driving on a level surface at constant speed.

Set Conditions

D

The oxygen sensor (rear) output voltage is 4.5 V or more when the sensor
output voltage is 0.2 V or less and a voltage of 5 V is applied to the
oxygen sensor (rear) inside the engine-ECU.

D

Malfunction of oxygen sensor (rear)

D

Open or short circuit in the oxygen sensor (rear)
circuit or loose connector contact

D

Malfunction of engine-ECU

Range of Check

D

Two seconds have passed after the engine-ECU detected an open circuit.

D

When the oxygen sensor (front) is in good condition.

Set Conditions

D

When the air/fuel ratio is rich, the oxygen sensor (front) output voltage is
0.5 V or more, the oxygen sensor (rear) output voltage is less than 0.1 V,
and the oxygen sensor (rear) output voltage fluctuates within 0.078 V.

NG

Replace the engine-ECU.

OK

Check the trouble symptoms.

OK

Transient malfunction
(Refer to GROUP 00 – Points to
Note for Intermittent Malfunctions.)

OK

Check the following connectors:
C-90, B-11, D-47, C-26<RHD>,
C-25<LHD>

Repair

NG

OK

Check the harness wire between
the oxygen sensor (rear) and the
engine-ECU, and repair if necessary.

NG

Check the following connectors:
C-90, B-11, D-47, C-26<RHD>,
C-25<LHD>

NG

Repair

OK

Measure at engine-ECU connector
connector C-90.

D

Measure the voltage at the
engine-ECU terminal.

D

Engine: 2,500 r/min (after
warming up)

D

Voltage between terminal 75 and
earth
OK: 0 V and 0.8 V alternate.

OK

Check the harness wire between
the oxygen sensor (rear) and the
engine-ECU, and repair if necessary.

OK

NG

Repair

Check the following connectors:
C-90, B-11, D-47, C-26<RHD>,
C-25<LHD>

OK

Check the harness wire between
the oxygen sensor (rear) and the
engine-ECU, and repair if necessary.

NG

Replace the engine-ECU.

OK

Check the trouble symptoms.

OK

Check the harness wire between
the oxygen sensor (rear) and the
engine-ECU.

NG

Repair

Repair

OK

Measure at oxygen sensor (rear)
connector B-11.

D

Disconnect the connector and
measure at the harness side.

D

Resistance between terminal 1
and earth
OK: 

 or less

NG

Check the following connectors:
C-90, B-11, D-47, C-26<RHD>,
C-25<LHD>

NG

Check the following connector:
B-11

NG

Repair

(2) NG

Check the oxygen sensor (rear). 
(Refer to P.13C-104.)

NG

Replace

Repair

OK

Measure at oxygen sensor (rear)
connector B-11.

D

Measure the voltage at the
oxygen sensor (rear) terminal.

D

Engine: 2,500 r/min (after
warming up)

(1) Voltage between terminal 1 and

earth
OK: 0.5 V or less

(2) Voltage between terminal 3 and

earth
OK: 0 V and 0.8 V alternate.

(1) NG

Check the following connectors:
C-90, B-11, D-47, C-26<RHD>,
C-25<LHD>

NG

MPI <4G9> – 

Troubleshooting

13C-28

Code No. P0141 Oxygen sensor heater (rear) system
<sensor 2>

Probable cause

Range of Check

D

The engine coolant temperature is approx. 20

_

C or more.

D

The oxygen sensor heater (rear) remains on.

D

The engine speed is 50 r/min or more.

D

Battery voltage is 11 – 16 V.

Set Conditions

D

The current, which flows through the oxygen sensor heater (rear), is 0.2 A
or less or 3.5 A or more for six seconds.

D

Malfunction of oxygen sensor heater (rear)

D

Open or short circuit in the oxygen sensor heater
(rear) circuit or loose connector contact

D

Malfunction of engine-ECU

NG

Replace the engine-ECU.

OK

Check the trouble symptoms.

OK

Transient malfunction
(Refer to GROUP 00 – Points to
Note for Intermittent Malfunctions.)

OK

Check the harness wires between
the oxygen sensor (rear) and the
engine-ECU and between the
oxygen sensor (rear) and the engine
control relay.

NG

Repair

OK

Check the following connector:
C-89

NG

Repair

OK

Check the harness wire between
the oxygen sensor (rear) and the
engine-ECU, and repair if necessary.

Repair

NG

Check the following connectors:
B-11, C-89, C-24

NG

OK

Measure at engine-ECU connector
C-89.

D

Measure the voltage at the
engine-ECU terminal.

D

Ignition switch: ON

D

Voltage between terminal 54 and
earth
OK: System voltage

OK

Check the harness wires between
the oxygen sensor (rear) and the
engine control relay, and repair if
necessary.

Repair

NG

Check the following connectors:
D-47, C-24, A-36, A-43X

NG

OK

Measure at oxygen sensor (rear)
connector B-11.

D

Disconnect the connector and
measure at the harness side.

D

Ignition switch: ON

D

Voltage between terminal 2 and
earth
OK: System voltage

OK

Check the following connector:
B-11

NG

Repair

Measure at oxygen sensor (rear)
connector B-11.

D

Disconnect the connector and
measure at the harness side.

D

Resistance between terminals 2
and 4
OK: 11  – 18 

NG

Replace

MPI <4G9> – 

Troubleshooting

13C-29

Code No. P0170 Abnormal fuel system

Probable cause

Range of Check

D

Engine: Being learning the air-fuel ratio

Set Conditions

D

Ten seconds or more have been passed while the fuel injection amount
compensation value is too low.

or

D

Ten seconds or more have been passed while the fuel injection amount
compensation value is too high.

D

Incorrect fuel pressure

D

Malfunction of fuel supply system

D

Malfunction of oxygen sensor (front)

D

Malfunction of intake air temperature sensor

D

Malfunction of barometric pressure sensor

D

Malfunction of air flow sensor

D

Malfunction of engine-ECU

Replace the engine-ECU.

OK

Replace the volume air
flow sensor.

Yes

Replace the engine-ECU.

OK

Yes

Replace the volume air
flow sensor.

No

D

Check for clogging of
the injector.

D

Check for clogging of
the fuel filter and fuel
line.

D

Check the fuel pump
(insufficient discharge
rate.)

D

Check for exhaust
leaks (oxygen sensor
installation section,
cracks in exhaust
manifold, cracks in
front pipe, etc.).

D

Check for entry of
foreign matter (water,
kerosene, etc.) into
the fuel.

MUT-

II

 Data list

12 Volume air flow sensor
(Refer to P.13C-74.)

D

Does the tester indi-
cate less than the
standard value?

OK

No

Less than zero

MUT-

II

 Data list

12 Volume air flow sensor
(Refer to P.13C-74.)

D

Does the tester indi-
cate more than the
standard value?

NG

Repair

OK

MUT-

II

 Data list

81 Long-term fuel compensation (Refer to P.13C-77.)

D

Is fuel trim more or less than zero?

More than
zero

Check if air was drawn into
the intake system.

OK

Check the fuel pressure (Refer to P.13C-98.)

OK

Check the harness wire between the engine-ECU and the injector
connector.

NG

Repair

OK

Check the following connectors:
A-61, A-62, A-63, A-64, A-36

NG

Repair

OK

Check the injector (Refer to P.13C-106.)

NG

Replace

OK

MUT-

II

 Data list

25 Barometric pressure sensor (Refer to P.13C-76.)

NG

Check the barometric pressure sensor system. (Refer to P.13C-16,
INSPECTION PROCEDURE FOR DIAGNOSTIC TROUBLE
CODE P0105.)

OK

MUT-

II

 Data list

13 Intake air temperature sensor (Refer to P.13C-74.)

NG

Check the intake air temperature sensor system. (Refer to
P.13C-18, INSPECTION PROCEDURE FOR DIAGNOSTIC
TROUBLE CODE P0110.)

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 DIAGNOSTIC
TROUBLE CODE P0115.)

D

Check for fuel leaks
from injector.

D

Check for entry of
foreign matter (water,
kerosene, etc.) into
the fuel.

 

 

 

 

 

 

 

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