Mitsubishi Space Star. Manual - part 60

13B-27

Code No. P0300 Random cylinder misfire detected

Probable cause

Range of Check



Engine speed is approx. 50 – 4,500 r/min.



When the engine is running except deceleration and sudden acceleration

Set Conditions



The number of misfire exceeds a predetermined number per 200 engine
revolutions.



The number of misfire exceeds a predetermined number per 1,000 engine
revolutions.



Malfunction of the ignition system



Abnormal compression



Malfunction of injector



Abnormal signal from the crank angle sensor



Malfunction of the lambda control system



Malfunction of the engine coolant temperature
sensor



Missing timing belt teeth



Malfunction of the EGR valve



Malfunction of engine-ECU

NG

Check the following items:



Check the ignition coil, spark pugs, spark plug cables.



Check the compression pressure.



Check the timing belt for missing teeth.



Check the EGR system and EGR valve.

OK

MUT-II Data list
21 Engine coolant temperature sensor (Refer to P.13B-65.)

NG

OK

MUT-II Data list
81 Long-term fuel compensation (Refer to P.13B-65.)

NG

Check the abnormal fuel system (Refer to P.13B-25,
INSPECTION PROCEDURE FOR DIAGNOSIS CODE
P0170.)

OK

Check the injector (Refer to P.13B-74*.)

NG

Replace

MUT-II Data list
22 Crankshaft position sensor (Refer to P.13B-65.)



Crankshaft position sensor wave form check



Engine speed: stable
OK: Constant pulse range

NG

Check the crankshaft positron sensor system. (Refer to
P.13B–31, INSPECTION PROCEDURE FOR DIAGNOSIS
CODE P0335.)

OK

Check the following connectors: A-48, A-49, A-54, A-60,
B–28

NG

Repair

OK

Check the harness wire between the engine-ECU and the
injector connector

NG

Repair

MUT-II Data list
82 Short-term fuel compensation (Refer to P.13B-65.)

NG

Check the engine coolant temperature sensor system (Refer
to P.13B-13, INSPECTION PROCEDURE FOR DIAGNOSIS
CODE P0115.)

NG

NOTE:
*:

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

MPI  – 

Troubleshooting

13B-28

Code No. P0301 No. 1 cylinder misfire detected

Code No. P0302 No. 2 cylinder misfire detected

Code No. P0303 No. 3 cylinder misfire detected

Code No. P0304 No. 4 cylinder misfire detected

Probable cause

Range of Check



The engine speed is 500 – 4,500 r/min.



While the engine is running except deceleration and sudden acceleration.

Set Conditions



The number of misfires exceeds a predetermined number per 200 engine
revolutions (Misfire has occurred in only one cylinder).

or



The number of misfires exceeds a predetermined number per 1,000 engine
revolutions (Misfire has occurred in only one cylinder).



Malfunction of the ignition system



Abnormal compression



Malfunction of injector



Malfunction of engine-ECU

Replace the engine-ECU.

NG

OK

Check the trouble symptoms.

NG

Check the compression pressure.
(Refer to GROUP 11B – On-vehicle
Service.)

Repair

OK

NG

Replace

Check the spark plugs.

Check the ignition coil (Refer to
GROUP 16 – Ignition System.)

OK

OK

Check the trouble symptoms.

NG

Replace the engine-ECU.

Check the harness wire between
the ignition coil and the
engine-ECU.

OK

NG

Repair

(2) NG

NG

Repair

Check the following connector:
B-28

OK

Check the harness wire between the
ignition coil and the ignition failure
sensor, and between the ignition coil
and the ignition failure sensor.

NG

Replace

Check the ignition failure sensor
(Refer to GROUP 16 – Ignition
System.)

OK

(1) NG

Check the following connector:
A-96

NG

Repair

OK

Measure at ignition coil connectors
A-89, A-91.



Disconnect the connector and
measure at the harness side.

(1) The voltage between terminal 1

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

(2) The voltage between terminal 3

and earth
(Engine: Cranking)
OK: 0.5  – 4.0 V

(3) The resistance between terminal

2 and earth
OK: 2 

Ω

 or less

NG

Repair

Check the harness wire between
the ignition coil and the earth, and
repair if necessary.

(3) NG

Check the following connectors:
A-89, A-91

NG

Check the injector (Refer to
P.13B–74*.)

Replace

OK

NG

Check the following connectors:
A-48, A-49, A-54, A–60, B-28

Repair

OK

NG

Check the harness wire between
the injector and the engine-ECU.

Repair

OK

NOTE:
*:

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

MPI  – 

Troubleshooting

13B-29

Code No. P0325 Detonation sensor system

Probable cause

Range of Check



Engine: Two seconds after the engine has been started

Set Conditions



Changes in sensor output voltage (detonation sensor peak voltage per 1/2
crankshaft rotation) in 200 consecutive cycles are 0.06 V or less.



Malfunction of the detonation sensor



Open or short circuit in the detonation sensor
circuit or loose connector contact



Malfunction of engine-ECU

NG

Replace the engine-ECU.

Check the trouble symptoms.

NG

Replace the detonation sensor.

OK

Check the trouble symptoms.

OK

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

OK

Check the harness wire between the detonation sensor and
the engine-ECU.

NG

Repair

OK

Check the following connector: B-31

NG

Repair

Check the following connector: A-50

NG

Repair

OK

Measure at the detonation sensor connector A-50.



Disconnect the connector and measure at the harness
side.



The resistance between terminal 2 and earth
OK: 2 

Ω

 or less

NG

Check the harness wire between the detonation sensor and
earth, and repair if necessary.

Code No. P0335 Crank angle sensor system

Probable cause

Range of Check



Engine is cranking

Set Conditions



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



Malfunction of the crank angle sensor.



Open or short circuit in the crank angle sensor
circuit or loose connector contact.



Malfunction of engine-ECU

MPI  – 

Troubleshooting

13B-30

NG

Replace the engine-ECU.

OK

Check the trouble symptoms.

OK

Check the harness wires between
the crank angle sensor and the
engine-ECU, crank angle sensor
and the engine control relay, and
the crank angle sensor and earth.
Then, repair if necessary.

NG

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

NG

Repair

Check the trouble symptoms.

OK

Replace the crank angle sensor.

NG

Check the crank angle sensor vane

NG

Replace

OK

Use an analyzer to measure the
output waveform at the crank angle
sensor connector A-94.



Use the test harness
(MD998478) to connect the
connector, and measure at the
pick-up harness side.



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.

OK

Check the harness wire between
the crank angle sensor and the
engine control relay, and repair if
necessary.

Check the following connector:
B-26

NG

Repair

(3) NG

OK

Check the trouble symptoms.

NG

Replace the engine-ECU.

OK

Check the harness wire between
the crank angle sensor and the
engine-ECU.

NG

Repair

NG

Check the following connector:
B-31

NG

Repair

OK

Check the harness wire between
the crank angle sensor 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 the connector A-94



Ignition switch: ON



The voltage between terminal 89
and earth.
OK: 4.8  – 5.2 V

(1) NG

Check the harness between the
crank angle sensor and earth, and
repair if necessary.

OK

Measure at the crank angle sensor
connector A-94.



Disconnect the connector and
measure at the harness side.

(1) The resistance between terminal

1 and earth
OK: 2 

Ω

 or less

(2) The voltage between terminal 2

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

(3) The voltage between terminal 3

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

NG

Check the following connector:
A-94

NG

Repair

MUT-

II

 Data list

22 Crank angle sensor

OK: Refer to P.13B-65, DATA

LIST REFERENCE TABLE.

OK

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