Mitsubishi Space Star. Manual — part 69
MPI –
Troubleshooting
13B-63
INSPECTION PROCEDURE 31
Ignition circuit system
Probable cause
The engine-ECU interrupts the ignition coil primary current by turning the power
transistor inside the engine-ECU ON and OFF.
Malfunction of ignition coil
Malfunction of ignition failure sensor
Improper connector contact, open circuit or
short-circuited harness wire
Malfunction of the engine-ECU
NG
To the next page
OK
Replace the engine-ECU.
NG
Repair
NG
Check the harness wire between the
engine-ECU and ignition coil connector.
OK
Check trouble symptom.
NG
Repair
OK
Check the following connector:
A-89, A-91
OK
Check trouble symptom.
NG
Repair
Check the following connector:
B-28
(2) NG
NG
OK
Check trouble symptom.
Check the harness wire between the
ignition coil and ignition failure sensor
connector, and repair if necessary.
NG
Repair
Check the following connector:
A-96
Measure at the ignition coil connectors
A-89, A-91.
Disconnect the connector, and
measure at the harness side.
(1) Voltage between 1 and earth
(Ignition switch: ON)
OK: Battery positive voltage
(2) Voltage between 3 and earth
(Engine: Cranking)
OK: 0.5 – 4.0 V
(3) Continuity between 2 and earth
OK: Continuity
(1) NG
OK
OK
Check the ignition switch. (Refer to GROUP 54 – Ignition Switch.)
Check the harness wire
between the ignition
failure sensor and ignition
switch connector.
NG
Repair
NG
OK
Check trouble symptom.
OK
Measure at the ignition failure sensor connector A-96.
Disconnect the connector and measure at the harness side.
Voltage between 4 and ground (Ignition switch: ON)
OK: System voltage
NG
Check the following
connector: B-18, B-58
NG
Repair
Check the ignition failure sensor.
(Refer to GROUP 16 – Ignition System.)
NG
Replace
OK
Check the ignition coil.
(Refer to GROUP 16 – Ignition System.)
NG
Replace
Check the harness wire between the
ignition coil connector and ground, and
repair if necessary.
(3) NG
MPI –
Troubleshooting
13B-64
OK
Replace the engine-ECU.
OK
Replace the ignition failure sensor.
Check the harness wire
between the engine-ECU
and the ignition failure
sensor connector.
NG
Repair
NG
OK
Check trouble symptom.
NG
Check the following
connector: A-96
NG
Repair
OK
Measure at the engine-ECU connector B-30.
Measure with the connector connected.
Voltage between 58 and earth
(Engine: Cranking or 3,000 r/min)
OK: 0.3 – 3.0 V
2. NG
Check the harness wire between the ignition failure sensor and
earth, and repair if necessary.
OK
Measure at the ignition failure sensor connector A-96.
Disconnect the connector and measure at the harness side.
1. Voltage between 2 and earth (Ignition switch: ON)
OK: 4 V or more
2. Continuity between 1 and earth
OK: Continuity
1. NG
There is an open or short-circuit the ignition signal output harness
of the ignition failure sensor, so check and repair the harness.
From the previous page
NG
Repair
OK
Check trouble symptom.
NG
Check the following
connector: B-30
MPI –
Troubleshooting
13B-65
DATA LIST REFERENCE TABLE
NOTE
*1: In a new vehicle [driven approximately 500 km or less], the air intake plenum pressure is sometimes
10 % higher than the standard pressure.
*2: The injector drive time represents the time when the cranking speed is at 250 r/min or below when
the power supply voltage is 11 V.
*3: In a new vehicle [driven approximately 500 km or less], the injector drive time is sometimes 10 %
longer than the standard time.
*4: In a new vehicle [driven approximately 500 km or less], the step of the stepper motor is sometimes
30 steps greater than the standard value.
Item
No.
Inspection
item
Inspection contents
Normal condition
Inspection
procedure
No.
Reference
page
11
Oxygen
sensor
(front)
Engine: After having
warmed up
Air/fuel mixture is
made leaner when
When at 4,000 r/min,
engine is suddenly
decelerated
200 mV or less
Code No.
P0130
13B-19
made leaner when
decelerating, and is
made richer when
racing.
When engine is
suddenly raced
600 – 1,000 mV
Engine: After having
warmed up
The oxygen sensor
signal is used to
check the air/fuel
Engine is idling
400 mV or less
(Changes)
600 – 1,000 mV
check the air/fuel
mixture
ratio, and control
condition is also
checked by the ECU.
2,500 r/min
13
Intake air
temperature
sensor
Ignition switch: ON or
with engine running
When intake air
temperature is
–20
C
–20
C
Code No.
P0110
13B-12
When intake air
temperature is 0
C
0
C
When intake air
temperature is 20
C
20
C
When intake air
temperature is 40
C
40
C
When intake air
temperature is 80
C
80
C
14
Throttle
position
Ignition switch: ON
Set to idle position
300 – 1,000 mV
Code No.
P0120
13B-16
position
sensor
Gradually open
Increases in
proportion to
throttle opening
angle
P0120
Open fully
4,500 – 5,500 mV
MPI –
Troubleshooting
13B-66
Item
No.
Inspection
item
Inspection contents
Normal condition
Inspection
procedure
No.
Reference
page
16
Power
supply
voltage
Ignition switch: ON
System voltage
Procedure
No. 25
13B-59
18
Cranking
signal
Ignition switch: ON
Engine: Stopped
OFF
Procedure
No. 27
13B-61
signal
(ignition
switch-ST)
Engine: Cranking
ON
No. 27
21
Engine
coolant
temperature
sensor
Ignition switch: ON or
with engine running
When engine
coolant temperature
is –20
C
–20
C
Code No.
P0115
13B-13
sensor
When engine
coolant temperature
is 0
C
0
C
When engine
coolant temperature
is 20
C
20
C
When engine
coolant temperature
is 40
C
40
C
When engine
coolant temperature
is 80
C
80
C
22
Crank
angle sen-
sor
Engine: Cranking
Tachometer:
Connected
Compare the engine
speed readings on
the tachometer and
the MUT-
II
.
Accord
Code No.
P0335
13B-25
Engine: Idling
Idle position
switch: ON
When engine
coolant temperature
is –20
C
1,475 – 1,675
r/min
When engine
coolant temperature
is 0
C
1,345 – 1,545
r/min
When engine
coolant temperature
is 20
C
1,200 – 1,400
r/min
When engine
coolant temperature
is 40
C
1,160 – 1,225
r/min
When engine
coolant temperature
is 80
C
650 – 850 r/min
24
Vehicle
speed sen-
sor
Drive at 40 km/h
Approximately 40
km/h
Code No.
P0500
13B-35
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