Mitsubishi Space Star. Manual — part 58

MPI –

Troubleshooting

13B-19

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

Probable cause

Range of Check

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

The engine coolant temperature is approx. 80

C or more.

Intake air temperature is 20 – 50

C

Engine speed is 1,200 r/min or more

Driving on a level surface at constant speed.

Set Conditions

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.

Malfunction of oxygen sensor (front)

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

Malfunction of engine-ECU

Range of Check

Engine speed is 2,800 r/min or less

During driving

During air/fuel ratio feedback control

Set Conditions

The oxygen sensor (front) output frequency is six or less per 10 seconds
on average.

MPI –

Troubleshooting

13B-20

NG

Replace the engine-ECU.

OK

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

OK

Check the trouble symptoms.

OK

Check the following connector:
B-31

Repair

NG

OK

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

NG

Check the following connector:
B-31

NG

Repair

OK

Measure at engine-ECU connector
B-31.

Measure the voltage at the
engine-ECU terminal.

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

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 connector:
B-31

OK

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

NG

Repair

Repair

OK

Measure at oxygen sensor (front)
connector A-55.

Disconnect the connector and
measure at the harness side.

Resistance between terminal 2
and earth
OK: 2

Ω

or less

NG

Check the following connector:
B-31

NG

Check the following connector:
A-55

NG

Repair

(2) NG

Check the oxygen sensor (front).
(Refer to P.13B-80.)

NG

Replace

Repair

OK

Measure at oxygen sensor (front)
connector A-55.

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

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.

(1) NG

Check the following connector:
B-31

NG

MPI –

Troubleshooting

13B-21

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

Probable cause

Range of Check

The engine coolant temperature is approx. 20

C or more.

The oxygen sensor heater (front) remains on.

The engine speed is 50 r/min or more.

Battery voltage is 11 – 16 V.

Set Conditions

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.

Malfunction of oxygen sensor heater (front)

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

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:
B-30

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 connector:
B-30

NG

OK

Measure at engine-ECU connector
B-30.

Measure the voltage at the
engine-ECU terminal.

Ignition switch: ON

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 connector:
B-26

NG

OK

Measure at oxygen sensor (front)
connector A-55.

Disconnect the connector and
measure at the harness side.

Ignition switch: ON

Voltage between terminal 1 and
earth
OK: System voltage

OK

Check the following connector:
A-55

NG

Repair

Measure at oxygen sensor (front)
connector A-55.

Disconnect the connector and
measure at the harness side.

Resistance between terminals 1
and 3
OK: 4.5 – 8.0

Ω

NG

Replace

Repair

NG

OK

Replace the engine-ECU.

MPI –

Troubleshooting

13B-22

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

Probable cause

Range of Check

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

The engine coolant temperature is approx. 80

C or more.

Intake air temperature is 20 – 50

C

Engine speed is 1,200 r/min or more

Driving on a level surface at constant speed.

Set Conditions

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.

Malfunction of oxygen sensor (rear)

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

Malfunction of engine-ECU

Range of Check

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

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

Set Conditions

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.