Mitsubishi Space Star. Manual - part 26

GDI  – 

Troubleshooting

13A-31

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

Probable cause

Range of Check



The engine coolant temperature is approx. 20



C or more.



The oxygen sensor heater (rear) 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 (rear), is 0.2 A
or less or 3.5 A or more for six seconds.



Malfunction of oxygen sensor heater (rear)



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



Malfunction of engine-ECU <M/T>



Malfunction of engine-A/T-ECU <A/T>

OK

Repair

OK

Measure at engine-ECU connector
B-87 <M/T> or engine-A/T-ECU
connector B-84 <A/T>.



Measure the voltage at the
engine-ECU terminal <M/T> or
engine-A/T-ECU terminal <A/T>.



Ignition switch: ON



Voltage between terminal 90
<M/T>, 26 <A/T> and earth
OK: System voltage

NG

Check the following connectors:
B-87 <M/T>,  B-84 <A/T>

NG

OK

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

Measure at oxygen sensor (rear)
connector D-22.



Disconnect the connector and
measure at the harness side.



Resistance between terminals 3
and 4
OK: 11  – 18 

Ω

NG

Replace

Repair

OK

Measure at oxygen sensor (rear)
connector D-22.



Disconnect the connector and
measure at the harness side.



Ignition switch: ON



Voltage between terminal 3 and
earth
OK: System voltage

NG

Check the following connector:
B-26

NG

OK

Check the following connector:
D-22

NG

Repair

OK

Check the trouble symptoms.

OK

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

NG

Replace the engine-ECU <M/T> or
engine-A/T-ECU <A/T>.

OK

Check the following connectors:
B-87 <M/T>,  B-84 <A/T>

NG

Repair

OK

Check the harness wires between
the oxygen sensor (rear) and the
engine-ECU <M/T> or
engine-A/T-ECU <A/T> and between
the oxygen sensor (rear) and the
engine control relay.

NG

Repair

Replace the engine-ECU<M/T> or
engine-A/T-ECU <A/T>.

OK

Repair

NG

Check the harness wire between
the oxygen sensor (rear) and the
engine-ECU <M/T> or
engine-A/T-ECU <A/T>, and repair if
necessary.

GDI  – 

Troubleshooting

13A-32

Code No. P0170 Abnormal fuel system

Probable cause

Range of Check



Engine: Being learning the air-fuel ratio

Set Conditions



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

or



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



Malfunction of fuel supply system



Malfunction of oxygen sensor (front)



Malfunction of intake air temperature sensor



Malfunction of barometric pressure sensor



Malfunction of air flow sensor



Malfunction of engine-ECU <M/T>



Malfunction of engine-A/T-ECU <A/T>

Repair

OK

MUT-

II

 Data list

74 Fuel pressure sensor 

(Refer to 13A-99, DATA LIST
REFERENCE TABLE.)

NG

Check fuel leakage around the fuel
pump (high-pressure) line.

NG

NO

Check the air intake from the intake
hose and intake manifold.

NG

Repair

OK

Check the oxygen sensor (front)
(Refer to P.13A-128.)

NG

Replace

MUT-

II

 Self-Diag Code

Is any diagnosis code other than
No. P0170 output?

YES

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

OK

Check the exhaust gas leaks from
the exhaust manifold.

NG

Repair

OK

Check the throttle body (around the
throttle valve), and clean if
necessary. (Refer to P.13A-96*.)

NG

Cleaning

OK

MUT-

II

 Data list

11 Oxygen sensor (front)
12 Air flow sensor
13 Intake air temperature sensor
21 Engine coolant temperature

sensor

25 Barometric pressure sensor
(Refer to 13A-99, DATA LIST
REFERENCE TABLE.)
Reference
If all the service data is normal, go
to  “OK.”
If any abnormal service is found, go
to  “NG.”

NG

Refer to the Inspection procedure
for the sensor, which is indicated by
the abnormal service data.
(Refer to P.13A-12, INSPECTION
CHART FOR DIAGNOSIS CODES.)

OK

Replace the fuel pump
(high-pressure).

Check the purge control solenoid
valve (Refer to GROUP 17 –
Emission Control).

NG

Replace

OK

To the next page

OK

NOTE
*:

Refer to the ’99 SPACE STAR Workshop Manual (Pub. No. CMXE99E1)

GDI  – 

Troubleshooting

13A-33

OK

Check the injectors for clogging or
leaks.

NG

Repair

OK

Check the fuel lines for fuel leaks.

NG

Repair

OK

Check the fuel pressure between
the fuel pump (low-pressure) and
the fuel pump (high-pressure) (Refer
to P.13A-122.)

NG

From the previous page

OK

Check the trouble symptoms.

OK

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

NG

Replace the engine-ECU <M/T> or
engine-A/T-ECU <A/T>.

OK

Check the EGR valve (Refer to
GROUP 17 – Emission Control.)

NG

Replace

Repair

GDI  – 

Troubleshooting

13A-34

Code No. P0190 Abnormal fuel pressure

Probable cause

Range of Check



Ignition switch: ON

Set Conditions



The sensor output voltage is 4.8 V or more, or 0.2 V or less for four
seconds.



Malfunction of of fuel pressure sensor



Open or short circuit in the fuel pressure sensor
circuit or loose connector contact



Malfunction of engine-ECU <M/T>



Malfunction of engine-A/T-ECU <A/T>

Range of Check



The following conditions are detected temporarily after the engine has been
started.
(1) Engine speed: 1,000 r/min or more
(2) Fuel pressure: 2 MPa or more



Engine running

Set Conditions



The fuel pressure is 6.9 MPa or more, or 2 MPa or less for four seconds.



Malfunction of high-pressure fuel pump



Clogging of high-pressure fuel lines

This diagnosis code will also be output when air is trapped into the
high-pressure fuel lines (such as poor fuel level). In that case, the air can be
evacuated by operating the engine for at least 15 seconds at 2,000 r/min. After
the repair, use the MUT-

II

 to erase the diagnosis code.



Air trapped due to poor fuel level

(2) NG

Check the following connectors:
B-87 <M/T>, B-86 <A/T>

NG

Repair

OK

Check the harness wire between
the fuel pressure sensor connector
and the engine-ECU <M/T> or
engine-A/T-ECU <A/T>, and repair if
necessary.

MUT-

II

 Data list

74 Fuel pressure sensor (Refer to

13A-99, DATA LIST
REFERENCE TABLE.)

OK

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

NG

Check the following connector:
A-83

NG

Repair

OK

Measure at fuel pressure sensor
connector A-83.



Disconnect the connector, and
measure at the harness side.

(1) Voltage between terminal 1 and

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

(2) Resistance between terminal 3

and earth
OK: 2 

Ω

 or less

(1) NG

Measure at engine-ECU connector
B-86 <M/T> or engine-A/T-ECU
connector B-86 <A/T>.



Measure the voltage at the
engine-ECU terminal <M/T> or
engine-A/T-ECU terminal <A/T>.



Ignition switch: ON



Voltage between terminal
41<M/T> or 87 <A/T> and earth
OK: 4.8  – 5.2 V

OK

Check the following connector:
B-86

NG

Repair

NG

Check the following connector:
B-86

NG

Repair

OK

Check the harness wire between the
fuel pressure sensor connector and
the engine-ECU <M/T> or
engine-A/T-ECU <A/T>.

NG

Repair

OK

Check the trouble symptoms.

NG

Replace the engine-ECU <M/T> or
engine-A/T-ECU <A/T>.

OK

Check the trouble symptoms.

NG

Replace the engine-ECU <M/T> or
engine-A/T-ECU <A/T>.

OK

To the next page

OK

Check the harness wire between the
fuel pressure sensor connector and
the engine-ECU <M/T> or
engine-A/T-ECU <A/T>.

NG

Repair