Mitsubishi Pajero Pinin. Manual - part 109

MPI <4G9> – 

Troubleshooting

13C-22

Code No. 0120 Throttle position sensor system

Probable cause

Range of Check

D

Excluding 2 seconds after the ignition switch is turned ON or immediately
after the engine start.

Set Conditions

D

The sensor output voltage is 0.2 V or less for four seconds.

or

D

Volume efficiency is 60 percent or lower.

D

Engine speed is lower than 1000 r/min.

D

The sensor output voltage is 2.0 V or more.

D

AFS: Normal

D

Malfunction of throttle position sensor

D

Open or short circuit in the throttle position
sensor circuit or loose connector contact

D

Malfunction of the engine-ECU

OK

To the next page

OK

Check the trouble symptoms.

NG

Replace the engine-ECU.

OK

Check the harness wire between
the throttle position sensor and the
engine-ECU.

NG

Repair

(2) NG

Check the following connector:
C-90

NG

Repair

OK

Check the trouble symptoms.

NG

Replace the engine-ECU.

OK

OK

Check the harness wire between
the throttle position sensor and the
engine-ECU, and repair if necessary.

NG

Check throttle position sensor. 
(Refer to P.13C-103.)

NG

Replace

NG

Repair

NG

Check the following connector:
C-90

NG

Repair

OK

Check the following connector:
A-06

NG

Repair

Check the harness wire between
the throttle position sensor and the
engine-ECU.

NG

Repair

OK

Measure at throttle position sensor
connector A-06.

D

Disconnect the connector and
measure at the harness side.

(1) The voltage between terminal 1

and earth
(Ignition switch: ON)
OK: 4.8  – 5.2 V

(2) Resistance between terminal 4

and earth
OK: 2 

Ω

 or less

(1) NG

Measure at engine-ECU connector
C-90.

D

Measure the voltage at the
engine-ECU connector terminals.

D

Ignition switch: ON

D

The voltage between terminal 81
and earth
OK: 4.8  – 5.2 V

OK

Check the following connector:
C-90

MUT-

II

 Data list

14 Throttle position sensor

OK: Refer to P.13C-74, DATA

LIST REFERENCE TABLE.

OK

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

MPI <4G9> – 

Troubleshooting

13C-23

OK

Check the harness wire between
throttle position sensor and the
engine-ECU.

OK

Check the trouble symptoms.

NG

Replace the engine-ECU.

OK

Check the harness wire between
throttle position sensor and the
engine-ECU, and repair if necessary.

OK

Check the following connector:
C-90

NG

Repair

OK

Measure at engine-ECU connector
C-90.

D

Measure the voltage at the
engine-ECU terminal.

D

Ignition switch: ON

D

The voltage between terminal 84
and earth
OK: Accelerator pedal fully re-

leased: 0.3 – 1.0 V
Accelerator pedal fully de-
pressed: 4.5 – 5.5 V

NG

Check the following connector:
C-90

NG

Repair

OK

Measure at throttle position sensor
connector A-06.

D

Use test harness (MB991536) to
connect the connector, and
measure at the pick-up harness.

D

Ignition switch: ON

(1) The voltage between terminal 1

and earth
OK: 4.8  – 5.2 V

(2) The voltage between terminal 4

and earth
OK: 0.5 V or less

(3) The voltage between terminal 2

and earth
OK: Accelerator pedal fully re-

leased: 0.3 – 1.0 V
Accelerator pedal fully de-
pressed: 4.5 – 5.5 V

(1), (2) NG

NG

Repair

Check the following connector:
C-90

NG

Repair

From the previous page

(3) NG

Adjust the throttle position sensor.
(Refer to P.13C-96.)

OK

Check the harness wire between
throttle position sensor and the
engine-ECU, and repair if necessary.

Check the following connector:
C-90

MPI <4G9> – 

Troubleshooting

MPI <4G9> – 

Troubleshooting

13C-24

Code No. P0125 Feedback system

Probable cause

Range of Check

D

The engine coolant temperature is approx. 80

_

C or more.

D

During stoichiometric feedback control

D

The vehicle is not being decelerated.

Set Conditions

D

Oxygen sensor (front) output voltage has been higher or lower than 0.5 V
for at least thirty seconds.

D

Malfunction of oxygen sensor (front)

D

Open or short circuit in the oxygen sensor (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 following connector:
C-90

Repair

NG

OK

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

NG

Check the following connectors:
A-67, C-90

NG

Repair

OK

Measure at engine-ECU 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 76 and
earth
OK: 0 V and 0.8 V alternate.

OK

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

OK

NG

Repair

Check the following connectors:
A-67, C-90

(2) NG

Check the oxygen sensor (front). 
(Refer to P.13C-103.)

NG

Replace

OK

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

Repair

(1) NG

Check the following connectors:
A-67, C-90

NG

OK

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

D

Use the test harness
(MD998464) to connect the
connector, and measure at the
pick-up harness side.

D

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

(1) Voltage between terminal 2 and

earth
OK: 0.5 V or less

(2) Voltage between terminal 4 and

earth
OK: 0 V and 0.8 V alternate.

NG

Replace the engine-ECU.

OK

Check the trouble symptoms.

OK

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

NG

Repair

Repair

OK

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

D

Disconnect the connector and
measure at the harness side.

D

Resistance between terminal 2
and earth
OK: 2 

Ω

 or less

NG

Check the following connectors:
A-67, C-90

NG

Check the following connector:
A-67

NG

Repair

MPI <4G9> – 

Troubleshooting

MPI <4G9> – 

Troubleshooting

13C-25

Code No. P0130 Oxygen sensor (front) system 
<sensor 1>

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

Engine speed is 1,200 r/min or more

D

Driving on a level surface at constant speed.

Set Conditions

D

The oxygen sensor (front) 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 (front) inside the engine-ECU.

D

Malfunction of oxygen sensor (front)

D

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

D

Malfunction of engine-ECU

Range of Check

D

Engine speed is 3,000 r/min or less

D

During driving

D

During air/fuel ratio feedback control

Set Conditions

D

The oxygen sensor (front) output frequency is five or less per 12 seconds
on average.

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 connector:
C-90

Repair

NG

OK

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

NG

Check the following connectors:
A-67, C-90

NG

Repair

OK

Measure at engine-ECU 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 76 and
earth
OK: 0 V and 0.8 V alternate.

OK

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

OK

NG

Repair

Check the following connectors:
A-67, C-90

OK

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

Repair

(1) NG

Check the following connectors:
A-67, C-90

NG

NG

Replace the engine-ECU.

OK

Check the trouble symptoms.

OK

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

NG

Repair

Repair

OK

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

D

Disconnect the connector and
measure at the harness side.

D

Resistance between terminal 2
and earth
OK: 2 

Ω

 or less

NG

Check the following connectors:
A-67, C-90

NG

Check the following connector:
A-67

NG

Repair

(2) NG

Check the oxygen sensor (front). 
(Refer to P.13C-103.)

NG

Replace

OK

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

D

Use the test harness
(MD998464) to connect the
connector, and measure at the
pick-up harness side.

D

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

(1) Voltage between terminal 2 and

earth
OK: 0.5 V or less

(2) Voltage between terminal 4 and

earth
OK: 0 V and 0.8 V alternate.