Mitsubishi Space Star. Manual - part 33

GDI  – 

Troubleshooting

13A-59

Code No. P1223 Communication line system with the
throttle valve controller

Probable cause

Range of Check



Ignition switch: ON



Battery voltage: 8 V or more.



Engine: Not cranking

Set Conditions



System detects an error in communication line between the engine-ECU
<M/T> or engine-A/T-ECU <A/T> and the throttle valve controller, and
between the throttle valve controller and the engine-ECU <M/T> or
engine-A/T-ECU <A/T>.



Short in communication line



Malfunction of engine-ECU <M/T>



Malfunction of engine-A/T-ECU <A/T>



Malfunction of throttle valve controller

NG

Replace the throttle valve controller.

OK

OK

Check the harness wire between
the throttle valve controller and the
engine-ECU <M/T> or
engine-A/T-ECU <A/T>.

NG

Repair

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

MUT-

II

 Self-Diag Code

Is Code No. P1220 output?

YES

Refer to Code No. P1220,
Electronic-controlled throttle valve system
(Refer to P13A-57.)

NO

NG

Repair

OK

Measure at throttle valve controller
connector B-15.



Measure voltage at the throttle
valve controller connector
terminals.



Ignition switch: ON

(1) The voltage between terminal 5

and earth
OK: System voltage

(2) The voltage between terminal 3

and earth
The voltage between terminal 4
and earth 
The voltage between terminal 16
and earth
OK: 0.5 V or less

(1) NG

Check the following connector: 
B-26

NG

Repair

OK

Check the harness wire between the
throttle valve controller and the engine
control relay, and repair if necessary.

NG

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

(2) NG

OK

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

NG

Repair

Check the following connector:
B-15

Check the trouble symptoms.

Check the trouble symptoms.

GDI  – 

Troubleshooting

13A-60

Code No. P1224 Throttle valve control servo motor
(Motor 1st phase malfunction) system

Probable cause

Range of Check



Throttle valve control servo relay: ON



System voltage: 8 V or more.

Set Conditions



Throttle valve control servo drive circuit is shorted to earth.



Other power source interferences with throttle valve control servo drive
circuit.



Throttle valve control servo drive circuit is open circuit.



Malfunction of the throttle valve control servo



Open circuit or short-circuited harness wire in
throttle valve control servo system, or poor
connector contact



Malfunction of the throttle valve controller

NG

Repair

OK

Check the trouble symptoms.

NG

Replace the throttle valve controller.

NG

Replace the throttle body assembly.

OK

NG

Repair

OK

Measure at throttle valve controller
connector B-15.



Measure voltage at the throttle
valve controller connector
terminals.



Ignition switch: ON



The voltage between terminal 1,
9 and earth

(Accelerator pedal:

 Fully open to

fully closed)
OK: The battery voltage tempo-

rarily shows a slight de-
crease.



The voltage between terminal
14, 15 and earth
(Accelerator pedal: Fully closed
to fully open

)

OK: The battery voltage show a

slight (approximately 2 V)
decrease.

NG

Check the following connector: A-68

NG

Repair

OK

Check the harness wire between the
throttle valve control servo and the
throttle valve controller.

NG

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

OK

Check the trouble symptoms

Check the following connector:
B-15

Check the throttle valve control
servo (Refer to P.13A-109*.)

NOTE
*:

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

GDI  – 

Troubleshooting

13A-61

Code No. P1225 Accelerator pedal position sensor (2nd
channel) system

Probable cause

Range of Check



Accelerator pedal position sensor (2nd channel) is normal.



Communication between the engine-ECU <M/T> or engine-A/T-ECU <A/T>
and the throttle valve controller is normal.

Set Conditions



Output voltage of the accelerator pedal position sensor (2nd channel) is 0.2
V or less for one second

or



Output voltage of the accelerator pedal position sensor (1st channel) is 2.5
V or less, and output voltage of the accelerator pedal position sensor (2nd
channel) is 4.5 V or more for one second.

or



Difference between the accelerator pedal position sensor (1st and 2nd
channels) output voltages exceeds 1.0 V (i.e. when the throttle valve
opening angle changes slightly).



Malfunction of accelerator pedal position sensor
(2nd channel)



Open or short circuit in accelerator pedal position
sensor (2nd channel) circuit or loose connector
contact



Malfunction of the throttle valve controller



Malfunction of engine-ECU <M/T>



Malfunction of engine-A/T-ECU <A/T>

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

NG

Repair

OK

OK

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

NG

Check the accelerator pedal position
sensor (Refer to P.13A-127.)

NG

Replace

OK

Measure at accelerator pedal
position sensor connector B-94.



Disconnect the connector and
measure at the harness side.

(1) The resistance between terminal

7 and earth
OK: 2 

Ω

 or less

(2) The voltage between terminal 8

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

(1) NG

Check the following connector:
B-15

NG

Repair

OK

Check the following connector:
B-94

NG

Repair

OK

Check the trouble symptoms.

NG

Replace the throttle valve controller.

(2) NG

Measure at throttle valve controller
connector B-15.



Measure 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

OK

Check the harness wire between
accelerator pedal position sensor
(2nd channel) and the throttle valve
controller, and repair if necessary.

NG

Repair

NG

Check the following connector:
B-15

NG

Repair

OK

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

NG

Repair

OK

To the next page

OK

Check the trouble symptoms.

NG

Replace the throttle valve controller.

MUT-

II

 Data list

77 Accelerator pedal position sensor

(2nd channel) (Refer to
P.13A-99, DATA LIST
REFERENCE TABLE.)

Check the following connector:
B-15

GDI  – 

Troubleshooting

13A-62

OK

Check the harness wire between
accelerator pedal position sensor (2nd
channel) and the throttle valve controller,
and repair if necessary.

OK

Check the harness wire between
accelerator pedal position sensor (2nd
channel) and the throttle valve controller,
and repair if necessary.

OK

Measure at throttle valve controller
connector B-15.



Measure voltage at the throttle
valve controller connector
terminals.



Ignition switch: ON



The resistance between 20 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 connector: B-15

NG

Repair

NG

Repair

OK

Check the trouble symptoms.

OK

Measure at accelerator pedal
position sensor connector B-94.



Use test harness (MB991658) to
connect terminals No. 6, No. 7,
No. 8 only, and measure at the
pick-up harness side.



Ignition switch: ON

(1) The voltage between terminal 6

and earth
OK: Accelerator pedal fully re-

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

(2) The voltage between terminal 7

and earth
OK: 0.5 V or more

(3) The voltage between terminal 8

and earth
OK: 4.8  – 5.2 V

(1) NG

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

From the previous page

OK

Check the harness wire between
accelerator pedal position sensor (2nd
channel) and the throttle valve controller,
and repair if necessary.

(2), (3) NG

Check the following connector: B-15

NG

Repair

OK

Check the following connector: B-15

NG

Repair

NG

Replace the throttle valve controller.

Check the following connector: B-15