Mitsubishi Colt Ralliart. Manual - part 54

 

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Mitsubishi Colt Ralliart. Manual - part 54

 

 

TROUBLESHOOTING

MULTIPORT FUEL INJECTION (MPI) <4A9>

13A-170

DIAGNOSIS PROCEDURE

STEP 1. Connector check: A-131 alternator 
connector

Q: Is the check result normal?

YES : 

Go to Step 2 .

NO : 

Repair or replace the connector.

STEP 2. Perform voltage measurement at A-131 
alternator connector.

• Disconnect connector, and measure at harness 

side.

• Ignition switch: ON

• Voltage between terminal No. 4 and earth.

OK: system voltage

Q: Is the check result normal?

YES : 

Go to Step 6 .

NO : 

Go to Step 3 .

STEP 3. Connector check: A-114 engine-ECU 
connector or engine-CVT-ECU connector

Q: Is the check result normal?

YES : 

Go to Step 4 .

NO : 

Repair or replace the connector.

AK402015

2

1

3

4

AC

Connector: A-131

A-131 (G)

A-131 Harness side
connector

AK402015

2

1

3

4

AC

Connector: A-131

A-131 (G)

A-131 Harness side
connector

AK402745

6

4

2

5

3

1

9

7

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L

AD

A-114

Connector: 

A-114

Harness side connector

Engine-ECU <M/T> or
engine-CVT-ECU <CVT>

Battery

Main

Index

Group

TOC

TROUBLESHOOTING

MULTIPORT FUEL INJECTION (MPI) <4A9>

13A-171

STEP 4. Check harness between A-131 (terminal 
No. 4) alternator connector and A-114 (terminal 
No. 65) engine-ECU connector or 
engine-CVT-ECU connector.

• Check output line for short circuit.

Q: Is the check result normal?

YES : 

Go to Step 5 .

NO : 

Repair the damaged harness wire.

STEP 5. M.U.T.-III diagnosis code

• Reconfirmation of diagnosis code.

Q: Is the diagnosis code set?

YES : 

Replace engine-ECU <M/T> or 

engine-CVT-ECU <CVT>.

NO : 

Intermittent malfunction (Refer to GROUP 
00 

− How to Use 

Troubleshooting/Inspection Service Points 

− 

How to Cope with Intermittent Malfunctions 

P.00-13

).

STEP 6. Perform voltage measurement at A-114 
engine-ECU connector or engine-CVT-ECU 
connector.

• Disconnect engine-ECU connector or 

engine-CVT-ECU connector, and connect special 
tool power plant ECU check harness 
(MB991987), and then measure the voltage on 
the check connector.

• Engine: Idle after warm-up

• Transmission: P range

• Radiator fan: Inactive

• Voltage between terminal No. 65 and earth.

OK: Switching the headlamps to ON from 
OFF causes the voltage to fall.

Q: Is the check result normal?

YES : 

Go to Step 9 .

NO : 

Go to Step 7 .

AK402015

2

1

3

4

AC

Connector: A-131

A-131 (G)

A-131 Harness side
connector

AK402745

6

4

2

5

3

1

9

7

8

10

11

12

13

14

15

16

17

18

19

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64

65

66

L

AD

A-114

Connector: 

A-114

Harness side connector

Engine-ECU <M/T> or
engine-CVT-ECU <CVT>

Battery

AK402745

6

4

2

5

3

1

9

7

8

10

11

12

13

14

15

16

17

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AE

A-114

Connector: 

A-114

Engine-ECU <M/T> or
engine-CVT-ECU <CVT>

Battery

A-114 Special tool power plant ECU check 
harness

Main

Index

Group

TOC

TROUBLESHOOTING

MULTIPORT FUEL INJECTION (MPI) <4A9>

13A-172

STEP 7. Check harness between A-131 (terminal 
No. 4) alternator connector and A-114 (terminal 
No. 65) engine-ECU connector or 
engine-CVT-ECU connector.

• Check output line for damage.

Q: Is the check result normal?

YES : 

Go to Step 8 .

NO : 

Repair the damaged harness wire.

STEP 8. M.U.T.-III diagnosis code

• Reconfirmation of diagnosis code.

Q: Is the diagnosis code set?

YES : 

Replace alternator.

NO : 

Intermittent malfunction (Refer to Group 00 

− 

How to Use troubleshooting/Inspection 
Service Points 

− How to Cope with 

Intermittent Malfunctions 

P.00-13

).

STEP 9. M.U.T.-III diagnosis code

• Reconfirmation of diagnosis code.

Q: Is the diagnosis code set?

YES : 

Replace engine-ECU <M/T> or 

engine-CVT-ECU <CVT>.

NO : 

Intermittent malfunction (Refer to Group 00 

− 

How to Use troubleshooting/Inspection 
Service Points 

− How to Cope with 

Intermittent Malfunctions 

P.00-13

).

AK402015

2

1

3

4

AC

Connector: A-131

A-131 (G)

A-131 Harness side
connector

AK402745

6

4

2

5

3

1

9

7

8

10

11

12

13

14

15

16

17

18

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53

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55

56

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58

59

60

61

62

63

64

65

66

L

AD

A-114

Connector: 

A-114

Harness side connector

Engine-ECU <M/T> or
engine-CVT-ECU <CVT>

Battery

Main

Index

Group

TOC

TROUBLESHOOTING

MULTIPORT FUEL INJECTION (MPI) <4A9>

13A-173

Code No. P0638: Throttle Valve Control Servo Circuit Range/Performance Problem

OPERATION

• Refer to P2101 − Throttle valve control servo cir-

cuit 

P.13A-198

.

FUNCTION

• Engine-ECU <M/T> or engine-CVT-ECU <CVT> 

checks the electronic controlled throttle system 
for abnormal conditions.

TROUBLE JUDGMENT

Check Conditions

• Ignition switch is in "ON" position.

• Battery positive voltage is more than 8.3 V.

• When variation in throttle valve opening angle is 

small <M/T>

• Power is being supplied to the throttle valve con-

trol servo <CVT>

• Throttle position sensor (main) output voltage is 

0.2 

− 4.8 V.

Judgement Criteria (To targeted open degree, the 

valve is stuck at the open side.)

• When the variation in throttle valve position is 

small <CVT>.

or

• Throttle position sensor (main) output voltage has 

continued to be above 0.5 V higher than the tar-
get throttle position sensor (main) voltage.

Check Conditions

• Ignition switch is in "ON" position.

• Throttle position sensor is normal.

Judgement Criterion

• Throttle position sensor (main) mid opening 

learning value is 4.0 V or more.

PROBABLE CAUSES

• Failed throttle valve return spring.

• Failed throttle valve operation.

• Failed throttle valve control servo.

• Open/short circuit in throttle valve control servo 

connector contact.

• Failed engine-ECU <M/T> or engine-CVT-ECU 

<CVT>.

DIAGNOSIS

STEP 1. Check throttle body.

• Check whether the throttle valve return spring is 

normal.

Q: Is the check result normal?

YES : 

Go to Step 2 .

NO : 

Replace the throttle body assembly.

STEP 2. Check the throttle valve control servo 
itself.

• Check the throttle valve control servo control 

motor itself (Refer to 

P.13A-366

)

Q: Is the check result normal?

YES : 

Go to Step 3 .

NO : 

Replace electronic-controlled throttle valve.

Main

Index

Group

TOC

 

 

 

 

 

 

 

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