Mitsubishi Space Star. Manual - part 29

GDI  – 

Troubleshooting

13A-43

OK

Measure at engine-ECU connector
B-87 <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 94
<M/T>, 95 <A/T> and earth
OK: Accelerator pedal fully re-

leased: 0.985 – 1.085 V
Accelerator pedal fully de-
pressed: 4.0 V or higher

NG

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

NG

Repair

OK

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

NG

OK

Check the trouble symptoms.

NG

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

Repair

OK

Measure at accelerator pedal
position sensor connector B-94.



Connect connector terminals No.
1, No. 2 and No. 3 only by
using test harness (MB991658),
and measure at the pick-up
harness.



Ignition switch: ON

(1) Voltage between terminal 1 and

earth
OK: 0.5 V or less

(2) Voltage between terminal 2 and

earth
OK: 4.8  – 5.2 V

(3) Voltage between terminal 3 and

earth
OK: Accelerator pedal fully re-

leased: 0.985 – 1.085 V
Accelerator pedal fully de-
pressed: 4.0 V or higher

(1), (2) NG

Check the following connectors:
B-86 <M/T>, B-85 <A/T>

NG

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

NG

Repair

OK

Check the harness wire between
accelerator pedal position sensor
(1st channel) and the engine-ECU
<M/T> or engine-A/T-ECU <A/T>,
and repair if necessary.

From the previous page

(3) NG

Adjust the accelerator pedal position
sensor. (Refer to P.13A-121.)

OK

Check the harness wire between
accelerator pedal position sensor
(1st channel) and the engine-ECU
<M/T> or engine-A/T-ECU <A/T>,
and repair if necessary.

OK

Check the harness wire between
accelerator pedal position sensor
(1st channel) and the engine-ECU
<M/T> or engine-A/T-ECU <A/T>,
and repair if necessary.

Repair

GDI  – 

Troubleshooting

13A-44

Code No. 0225 Throttle position sensor (2nd channel)
system

Probable cause

The throttle valve controller judges a malfunction, and then transmit the result
to the engine-ECU <M/T> or engine-A/T-ECU <A/T>.
Range of Check



Ignition switch: ON



The throttle position sensor (1st channel) is normal.

Set Conditions



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

or



The sensor output voltage is 4.85 V or more for four seconds, and the
output voltage of the throttle position sensor (1st channel) is 1.2 V or more.

or



The throttle position sensor (1st channel) and throttle position sensor (2nd
channel) combination output voltage is outside 4 – 6 V.



Malfunction of throttle position sensor (2nd
channel)



Open or short circuit in the throttle position
sensor (2nd channel) circuit or loose connector
contact



Malfunction of the throttle valve controller



Malfunction of the engine-ECU <M/T>



Malfunction of the engine-A/T-ECU <A/T>

OK

Check the harness wire between
the throttle position sensor and the
throttle valve controller, and repair if
necessary.

NG

Check throttle position sensor (2nd
channel). (Refer to P.13A-106*.)

NG

Replace

NG

Repair

NG

Check the following connector:
B-15

NG

Repair

OK

Check the trouble symptoms.

NG

Replace the throttle valve controller.

OK

Check the following connector:
A-66

NG

Repair

OK

Check the harness wire between
the throttle position sensor and the
throttle valve controller.

NG

Repair

OK

Check the harness wire between
the throttle position sensor and the
throttle valve controller.

NG

Repair

MUT-

II

 Data list

14 Throttle position sensor (2nd

channel)
OK: Refer to P.13A-99, DATA

LIST REFERENCE TABLE.

OK

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

OK

To the next page

OK

Measure at throttle position sensor
connector A-66.



Disconnect the connector and
measure at the harness side.

(1) The 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 throttle valve controller
connector B-15.



Measure the voltage at the
throttle valve controller connector
terminals.



Ignition switch: ON



The voltage between terminal 6
and earth
OK: 4.8  – 5.2 V

OK

Check the following connector:
B-15

(2) NG

Check the following connector:
B-15

NG

Repair

OK

Check the trouble symptoms.

NG

Replace the throttle valve controller.

NOTE
*:

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

GDI  – 

Troubleshooting

13A-45

OK

Measure at engine-ECU connector
B-87 <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



The voltage between terminal 78
and earth
OK: Accelerator pedal fully re-

leased: 4.0 V or more 
Accelerator pedal fully de-
pressed: 0.4 – 0.6 V

NG

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

NG

Repair

OK

Check the harness wire between
throttle position sensor (2nd
channel) and the engine-ECU <M/T>
or engine-A/T-ECU <A/T>, and
repair if necessary.

OK

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

NG

Repair

OK

Check the trouble symptoms.

NG

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

OK

Measure at throttle position sensor
connector A-66.



Use test harness (MB991536) to
connect the connector, and
measure at the pick-up harness.



Ignition switch: ON

(1) The voltage between terminal 1

and earth
OK: 4.8  – 5.2 V

(2) The voltage between terminal 3

and earth
OK: 0.5 V or less

(3) The voltage between terminal 4

and earth
OK: Accelerator pedal fully re-

leased: 4.0 V or more 
Accelerator pedal fully de-
pressed: 0.4 – 0.6 V

(1), (2) NG

NG

Repair

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

NG

Repair

OK

Check the harness wire between
throttle position sensor (2nd channel)
and the throttle valve controller.

From the previous page

(3) NG

Adjust the throttle position sensor.
(Refer to P.13A-96*.)

OK

Check the harness wire between
throttle position sensor (2nd
channel) and the engine-ECU <M/T>
or engine-A/T-ECU <A/T>, and
repair if necessary.

Check the following connector:
B-15

NOTE
*:

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

Code No. P0300 Ignition coil (power transistor) system

Probable cause

Range of Check



Engine speed is approx. 50 – 4,000 r/min.



Engine is not cranking.

Set Conditions



The ignition failure sensor does not send a signal about a certain cylinder
for four seconds.



Malfunction of the ignition coil



Malfunction of the ignition failure sensor



Malfunction of spark plug



Open or short circuit in  the primary ignition
circuit or loose connector contact



Malfunction of engine-ECU <M/T>



Malfunction of engine-A/T-ECU <A/T>

GDI  – 

Troubleshooting

13A-46

NG

Check the spark plug and the
ignition coil for a defective cylinder.
(Refer to GROUP 16 – Ignition
System.)

Check the trouble symptoms.

NG

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

OK

Check the harness wire between
the engine-ECU <M/T> or
engine-A/T-ECU <A/T> and the
ignition coil connector for a
defective cylinder.

NG

Repair

OK

Check the following connector:
B-84

NG

Repair

OK

MUT-

II

 Actuator Test

01 No. 1 injector
02 No. 2 injector
03 No. 3 injector
04 No. 4 injector

OK: The idling condition should

change.

Reference
When the cylinder (defective
cylinder) where idling condition does
not change is detected after
suspending the injector, go to (1)
and inspect the spark plug, the
ignition coil, the connector, and the
harness of the defective cylinder.
(When more than one cylinder are
detected, inspect all of them.)
When all the cylinders are OK, go
to (2).

(1)

Check the following connectors:
Ignition coil connectors, which
correspond to defective cylinders
(A-85, A-86, A-89, A-91).

NG

Repair

Check the spark plug and the
ignition coil for a defective cylinder.
(Refer to GROUP 16 – Ignition
System.)

NG

Replace

OK

Use an analyzer to measure the signal waveform at engine-ECU connector B-84
<M/T> or engine-A/T-ECU connector B-84 <A/T>.



Engine: Idling



The voltage between the ignition coil primary signal terminal for a defective cylinder
and earth
OK: A normal waveform should be displayed as described on P.13A-118 (Inspec-

tion Procedure Using an Analyzer).

OK

Repair the ignition coil assembly for
a defective cylinder and the spark
plug.

NG

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

(2)

Use an analyzer to measure the
signal waveform at the ignition
failure sensor connector A-96.



Use test harness (MB991536) 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.13A-118 (INSPEC-
TION PROCEDURE US-
ING AN ANALYZER).

Reference
When a normal waveform is
displayed, compare it with that of
the ignition coil primary signal at the
engine-ECU terminal <M/T> or
engine-A/T-ECU <A/T> to determine
the cylinder  (defective cylinder) with
an abnormal waveform.

→

When one or more cylinders are

abnormal, go to (1)

→

When all of the cylinders are

abnormal, go to (3)

→

When a normal waveform is

displayed, go to (4).

(3)

Check the following connector:
A-86 <M/T>, A-85 <A/T>

NG

Repair

OK

Check the harness wires between
the ignition failure sensor and the
engine-ECU <M/T> or
engine-A/T-ECU <A/T>, and between
the ignition failure sensor and earth.

NG

Repair

OK

Repair the ignition failure sensor.

(4)

Check the trouble symptoms.

OK

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

(1)