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
Ω
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: 2
Ω
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
Ω
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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