Mitsubishi Space Star. Manual - part 21

GDI  – 

Troubleshooting

13A-11

Malfunctioning item

Control contents during malfunction

Accelerator pedal position sen-
sor (1st channel)

1.

Suspends lean burn operation.

2.

Controls the throttle valve position by using signals from the accelerator pedal
position sensor (2nd channel). (However, this control is not applicable if the
voltage difference between the accelerator pedal position sensor (1st channel)
and accelerator pedal position sensor (2nd channel) is 1.0 V or higher.)

3.

Also suspends the electronic-controlled throttle valve system when the
accelerator pedal position sensor (2nd channel) is defective.

Throttle position sensor (1st
channel)

1.

Suspends lean burn operation.

2.

Controls throttle opening angle feedback by using signals from throttle position
sensor (2nd channel). (However, the controlling system is not applied when
the throttle position sensor (1st channel) and throttle position sensor (2nd
channel) combination output voltage is outside 4 – 6 V.)

3.

Refrains from controlling the throttle opening angle feedback when throttle
position sensor (2nd channel) is also defective.

Electronic-controlled throttle
valve system

1.

Suspends the electronic controlled throttle valve system.

2.

Suspends lean burn operation.

3.

Suspends the idle speed feedback control.

Throttle valve position feed-
back

1.

Suspends the electronic controlled throttle valve system.

2.

Suspends lean burn operation.

3.

Suspends the engine speed feedback control.

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

1.

Communication error between the throttle valve controller and the engine-ECU
<M/T> or engine-A/T-ECU <A/T>:



Suspends lean burn operation.



Cuts the fuel supply when the engine speed reaches 3,000 r/min or more.



Suspends the cruise-control.

2.

Communication error between the throttle valve controller and the engine-ECU
<M/T> or engine-A/T-ECU <A/T>:



Suspends lean burn operation.



Cuts the fuel supply when the engine speed reaches 3,000 r/min or more.



Suspends the cruise-control.



The throttle valve controller controls the throttle valve opening angle by
using signals from accelerator pedal position sensor (2nd channel).

Throttle control servo motor 1st
phase malfunction

Bans lean burn operation.

Throttle control servo motor
2nd phase malfunction

1.

Suspends electronic control throttle valve system.

2.

Bans lean burn operation.

3.

Bans engine speed feed back control.

Misfiring

If the detected misfiring causes damage to the catalyst, the misfiring cylinder will be
shut down.

NOTE
If the electronic-controlled throttle valve system is suspended, the engine warning lamp will illuminate.

GDI  – 

Troubleshooting

13A-12

INSPECTION CHART FOR DIAGNOSIS CODES

Code No.

Diagnosis item

Reference page

P0100

Air flow sensor system

13A-14

P0105

Barometric pressure sensor system

13A-16

P0110

Intake air temperature sensor system

13A-18

P0115

Engine coolant temperature sensor system

13A-19

P0120



Throttle position sensor 1 (1st channel) system

13A-22

P0125

Feedback system

13A-24

P0130

Oxygen sensor (front) system <sensor 1>

13A-26

P0135

Oxygen sensor heater (front) system <sensor 1>

13A-28

P0136

Oxygen sensor (rear) system <sensor 2>

13A-29

P0141

Oxygen sensor heater (rear) system <sensor 2>

13A-31

P0170

Abnormal fuel system

13A-32

P0190



Abnormal fuel pressure

13A-34

P0201

No. 1 injector system

13A-35

P0202

No. 2 injector system

13A-37

P0203

No. 3 injector system

13A-38

P0204

No. 4 injector system

13A-39

P0220



Accelerator pedal position sensor (1st channel) system

13A-41

P0225



Throttle position sensor (2nd channel) system

13A-44

P0300



Ignition coil (power transistor) system

13A-45

P0301

No. 1 cylinder misfire detected

13A-47

P0302

No. 2 cylinder misfire detected

13A-47

P0303

No. 3 cylinder misfire detected

13A-47

P0304

No. 4 cylinder misfire detected

13A-47

P0325

Detonation sensor system

13A-48

P0335

Crank angle sensor system

13A-48

P0340

Camshaft position sensor system

13A-50

P0403

EGR valve system

13A-52

P0420

Catalyst malfunction

13A-54

P0443

Purge control solenoid valve system

13A-55

P0500

Vehicle speed sensor system

13A-56

P1200

Injector driver system

13A-56

P1220



Electronic-controlled throttle valve system

13A-57

GDI  – 

Troubleshooting

13A-13

Code No.

Reference page

Diagnosis item

P1221



Throttle valve position feedback system

13A-58

P1223



Communication line with throttle valve controller

13A-59

P1224



Throttle valve control servo motor (motor 1st phase malfunction) system

13A-60

P1225



Accelerator pedal position sensor (2nd channel) system

13A-61

P1228



Throttle valve control servo motor (motor 2nd phase malfunction) system

13A-63

P1500

Alternator FR terminal system

13A-64

P1515

Brake vacuum sensor system

13A-65

P1610

Immobilizer system

13A-67

NOTE
1.

Do not replace the engine-ECU <M/T> or engine-A/T-ECU <A/T> until a through terminal check reveals
there are no short/open circuit.

2.

Check that the engine-ECU <M/T> or engine-A/T-ECU <A/T> earth circuit is normal before checking
for the cause of the problem.

3.

After the engine-ECU <M/T> or engine-A/T-ECU <A/T> has detected a malfunction, a diagnosis code
is recorded the next time the engine is started and the same malfunction is re-detected. However,
for items marked with a “



”, the diagnosis code is recorded on the first detection of the malfunction.

4.

Sensor 1 indicates the sensor mounted at a position closest to the engine, and sensor 2 indicates
the sensor mounted at the position second closest to the engine.

GDI  – 

Troubleshooting

13A-14

INSPECTION PROCEDURE CLASSIFIED BY DIAGNOSIS CODE

Code No. P0100 Air flow sensor system

Probable cause

Range of Check



Engine speed: 500 r/min or more

Set Conditions



The sensor output frequency is 3.3 Hz or less for four seconds.



Malfunction of air flow sensor



Open or short circuit in air flow sensor circuit or
loose connector contact



Malfunction of engine-ECU <M/T>



Malfunction of engine-A/T-ECU <A/T>

OK

(3) NG

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

NG

Repair

(2) NG

Check the following connector:
B-26

NG

Repair

OK

Check the harness between the air
flow sensor and the engine-ECU
<M/T> or engine-A/T-ECU <A/T>,
and repair if necessary.

MUT-

II

 Data list

12 Air flow sensor (Refer to
P.13A-99, DATA LIST REFERENCE
TABLE.)

OK

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

NG

Check the following connector:
A-73

NG

Repair

OK

Measure at air flow sensor
connector A-73.



Disconnect the connector and
measure at the harness side.

(1) Voltage between terminal 3 and

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

(2) Voltage between terminal 4 and

earth (Ignition switch: ON)
OK: System voltage

(3) Resistance between terminal 5

and earth
OK: 2 

Ω

 or less

(1) NG

Measure at engine-ECU connector
B-86 <M/T> or engine-A/T-ECU
connector B-85 <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 61
<M/T>, 65 <A/T> and earth
OK: 4.8  – 5.2 V

OK

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

NG

Repair

NG

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

NG

Repair

OK

Check the harness between the air
flow sensor and the engine-ECU
<M/T> or engine-A/T-ECU <A/T>.

NG

Repair

Check the trouble symptoms.

NG

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

OK

Check the harness between the air
flow sensor and the engine control
relay, and repair if necessary.

OK

Check the harness between the air
flow sensor and the engine-ECU
<M/T> or engine-A/T-ECU <A/T>.

NG

Repair

OK

Check the trouble symptoms.

NG

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

OK

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