Mitsubishi Space Star. Manual - part 61

MPI  – 

Troubleshooting

13B-31

Code No. P0340 Camshaft position sensor system

Probable cause

Range of Check



After the engine was started

Set Conditions



The sensor output voltage does not change for 2 seconds (no pulse signal
input).



Malfunction of the camshaft position sensor



Open or short circuit in the camshaft position
sensor circuit or loose connector contact.



Malfunction of engine-ECU

NG

Replace the engine-ECU.

OK

Check the trouble symptoms.

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

OK

OK

Check the harness wires between the camshaft position sensor connector and the
engine-ECU, the camshaft position sensor connector and the engine control relay, and
the camshaft position sensor connector and earth. Then, repair if necessary.

OK

NG

Repair

Check the following connectors:
B-26, B-31

NG

Replace the camshaft position
sensor.

Check the trouble symptoms.

NG

Check the camshaft position sensing
cylinder.

NG

Replace

OK

Use an analyzer to measure the
output waveform at camshaft
position sensor connector A-81.



Use test harness (MB991709) to
connect the connector, and
measure at the pick-up harness.



Engine: Idling



The voltage between terminal 2
and earth
OK: A normal waveform should

be displayed as described
on P.13B-72 (Inspection
Procedure Using an Ana-
lyzer), its maximum value
should be 4.8 V or more,
and its minimum value
should be 0.6 V or less
with no noise in waveform.

Check the harness wire between
the camshaft position sensor
connector and earth, and repair if
necessary.

(3) NG

OK

Check the trouble symptoms.

NG

Replace the engine-ECU.

OK

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

NG

Repair

NG

NG

Repair

Check the following connector:
B-31

OK

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

NG

Repair

OK

Check the following connector:
B-31

(2) NG

Measure at engine-ECU connector
B-31.



Measure the voltage at the
engine-ECU terminal.



Disconnect connector A-81.



Ignition switch: ON



The voltage between terminal 88
and earth
OK: 4.8  – 5.2 V

OK

Check the harness wire between
the camshaft position sensor
connector and the engine control
relay, and repair if necessary.

(1) NG

Check the following connector:
B-26

NG

Repair

OK

Measure at camshaft position
sensor connector A-81.



Disconnect the connector and
measure at the harness side.

(1) The voltage between terminal 3

and earth
(Ignition switch: ON)
OK: System voltage

(2) The voltage between terminal 2

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

(3) The resistance between terminal

1 and earth
OK: 2 

Ω

 or less

NG

Repair

Check the following connector:
A-81

MPI  – 

Troubleshooting

13B-32

Code No. P0403 EGR control solenoid valve system

Probable cause

Range of Check



Ignition switch: ON



Battery voltage is 10 V or more.

Set Conditions



The solenoid coil surge voltage (battery voltage + 2 V) is not detected
when the EGR control solenoid valve is turned from on to off.



Malfunction of the EGR control solenoid valve



Open or short circuit in the EGR control solenoid
valve circuit or loose connector contact



Malfunction of engine-ECU

Repair

MUT-

II

 Actuator Test

10 EGR control solenoid valve

OK: Operating sound can be

heard and the valve vibrates.

OK

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

NG

Check the harness wire between
the EGR control solenoid valve and
the engine control relay, and repair
if necessary.

NG

Measure at the EGR control
solenoid valve connector A-61.



Disconnect the connector, and
measure at the solenoid valve
side.



The resistance between
terminals 1 and 2
OK: 28  – 36 

Ω

 (at 20



C)

NG

Replace

OK

Measure at the EGR control
solenoid valve connector A-61.



Disconnect the connector and
measure at the harness side.



Ignition switch: ON



The voltage between terminal 1
and earth
OK: System voltage

NG

Check the following connector:
B-26

NG

Repair

OK

Check the following connector:
A-61

NG

Repair

OK

OK

Measure at engine-ECU connector
B-28.



Measure the voltage at the
engine-ECU terminal.



Ignition switch: ON



The voltage between terminal 6
and earth
OK: System voltage

NG

Check the following connector:
B-28

NG

Repair

OK

Check the following connectors:
B-26, B-28

NG

Repair

OK

NG

Repair

OK

Check the trouble symptoms.

NG

Replace the engine-ECU.

OK

NG

Replace the engine-ECU.

Check the harness wires between
the EGR control solenoid valve and
the engine control relay, and
between the EGR control solenoid
valve and the engine-ECU.

Check the harness wire between
the EGR control solenoid valve and
the engine-ECU.

MPI  – 

Troubleshooting

13B-33

Code No. P0421 Catalyst malfunction

Probable cause

Range of Check



The engine speed is 4,000 r/min or less.



During driving



During air/fuel ratio feedback control

Set Conditions



The ratio between the oxygen sensor (rear) and the oxygen sensor (front)
output frequencies reaches 0.8 per 10 seconds on average.



Malfunction of catalyst



Malfunction of the oxygen sensor (front)



Malfunction of the oxygen sensor (rear)



Malfunction of engine-ECU

Check the trouble symptoms.

Check the exhaust manifold. (Are there any cracks?)

NG

OK

MUT-

II

 Data list

59 Oxygen sensor (rear)



Transmission: 2nd



Drive with wide open throttle
OK: 600  – 1,000 mV

NG

Check the oxygen sensor (rear) system <sensor 2>
(Refer to P.13B-22, INSPECTION PROCEDURE FOR
DIAGNOSTIC TROUBLE CODE P0136.)

OK

MUT-

II

 Data list

11 Oxygen sensor (front)



Transmission: 2nd
OK: Changeover between 0 – 400 mV and 600 – 1,000

mV occur 15 times in 10 seconds.

OK

Replace the oxygen sensor (rear).

NG

Replace the catalytic converter.

Check the trouble symptoms.

NG

Replace the engine-ECU.

MUT-

II

 Data list

11 Oxygen sensor (front)

OK: 600  – 1,000 mV when racing suddenly

OK

NG

Repair

Check the oxygen sensor (front) system <sensor 1>
(Refer to P.13B-19, INSPECTION PROCEDURE FOR
DIAGNOSTIC TROUBLE CODE P0130.)

Replace the oxygen sensor (front).

NG

MPI  – 

Troubleshooting

13B-34

Code No. P0443 Purge control solenoid valve system

Probable cause

Range of Check



Ignition switch: ON



Battery voltage is 10 V or more.

Set Conditions



The solenoid coil surge voltage (battery voltage + 2 V) is not detected
when the purge control solenoid valve is turned from on to off.



Malfunction of the purge control solenoid valve



Open or short circuit in the purge control solenoid
valve circuit or loose connector contact



Malfunction of engine-ECU

Repair

MUT-

II

 Actuator Test

08 Purge control solenoid valve

OK: Operating sound can be

heard and the valve vi-
brates.

OK

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

NG

Check the harness wire between
the purge control solenoid valve and
the engine control relay, and repair
if necessary.

NG

Measure at the purge control
solenoid valve connector A-58.



Disconnect the connector, and
measure at the solenoid valve
side.



The resistance between
terminals 1 and 2
OK: 28  – 36 

Ω

 (at 20



C)

NG

Replace

OK

Measure at the purge control
solenoid valve connector A-58.



Disconnect the connector and
measure at the harness side.



Ignition switch: ON



The voltage between terminal 2
and earth
OK: System voltage

NG

Check the following connector:
B-26

NG

Repair

OK

Check the following connector:
A-58

NG

Repair

OK

OK

Measure at engine-ECU connector
B-28.



Measure the voltage at the
engine-ECU terminal.



Ignition switch: ON



The voltage between terminal 9
and earth
OK: System voltage

NG

Check the following connector:
B-28

NG

Repair

OK

Check the following connectors:
B-26, B-28

NG

Repair

OK

NG

Repair

OK

Check the trouble symptoms.

NG

Replace the engine-ECU.

OK

NG

Replace the engine-ECU.

Check the harness wires between
the purge control solenoid valve and
the engine control relay, and
between the purge control solenoid
valve and the engine-ECU.

Check the harness wire between
the purge control solenoid valve and
the engine-ECU.