Mitsubishi Colt Ralliart. Manual - part 48

TROUBLESHOOTING

MULTIPORT FUEL INJECTION (MPI) <4A9>

13A-146

STEP 5. 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.

• Disconnect A-110 camshaft position sensor con-

nector.

• Ignition switch: ON 

• Voltage between terminal No. 12 and earth.

OK: 4.9 

− 5.1 V

Q: Is the check result normal? 

YES : 

Go to Step 6 .

NO : 

Go to Step 7 .

STEP 6. Connector check: A-114 engine-ECU 
connector or engine-CVT-ECU connector

Q: Is the check result normal? 

YES : 

Check and repair harness between A-110 

(terminal No. 2) camshaft position sensor 
connector and A-114 (terminal No. 12) 
engine-ECU connector or engine-CVT-ECU 
connector. 

• Check output line for open circuit.

NO : 

Repair or replace the connector.

AK402745

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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

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AK402009

Connector: A-110

AC

A-110 (B)

A-110 Harness side
connector

AK402745

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AD

A-114

Connector: 

A-114

Harness side connector

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

Battery

1

2

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AK402009

Connector: A-110

AC

A-110 (B)

A-110 Harness side
connector

Main

Index

Group

TOC

TROUBLESHOOTING

MULTIPORT FUEL INJECTION (MPI) <4A9>

13A-147

STEP 7. Connector check: A-114 engine-ECU 
connector or engine-CVT-ECU connector

Q: Is the check result normal? 

YES : 

Go to Step 8 .

NO : 

Repair or replace the connector.

STEP 8. Check harness between A-110 (terminal 
No. 2) camshaft position sensor connector and 
A-114 (terminal No. 12) engine-ECU connector or 
engine-CVT-ECU connector.

• Check output line for short circuit.

Q: Is the check result normal? 

YES : 

Go to Step 9 .

NO : 

Repair the damaged harness wire.

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

).

AK402745

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AD

A-114

Connector: 

A-114

Harness side connector

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

Battery

1

2

3

AK402009

Connector: A-110

AC

A-110 (B)

A-110 Harness side
connector

AK402745

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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-148

STEP 10. Perform resistance measurement at 
A-110 camshaft position sensor connector.

• Disconnect connector, and measure at harness 

side.

• Resistance between terminal No. 1 and earth.

OK: Continuity (2 

Ω or less)

Q: Is the check result normal? 

YES : 

Go to Step 13 .

NO : 

Go to Step 11 .

STEP 11. Connector check: A-114 engine-ECU 
connector or engine-CVT-ECU connector

Q: Is the check result normal? 

YES : 

Go to Step 12 .

NO : 

Repair or replace the connector.

STEP 12. Check harness between A-110 (terminal 
No. 1) camshaft position sensor connector and 
A-114 (terminal No. 27) engine-ECU connector or 
engine-CVT-ECU connector.

• Check earthing line for open circuit and damage.

Q: Is the check result normal? 

YES : 

Go to Step 9 .

NO : 

Repair the damaged harness wire.

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AK402009

Connector: A-110

AC

A-110 (B)

A-110 Harness side
connector

AK402745

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AD

A-114

Connector: 

A-114

Harness side connector

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

Battery

1

2

3

AK402009

Connector: A-110

AC

A-110 (B)

A-110 Harness side
connector

AK402745

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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-149

STEP 13. Perform output wave pattern 
measurement at A-110 camshaft position sensor 
connector (Using an oscilloscope).

• Use special tool test harness (MB991709) to con-

nect connector, and measure at pick-up harness. 

• Engine: Idling

• Transmission: P range

• Voltage between terminal No. 2 and earth.

OK: Waveforms should be displayed on 
Inspection procedure using an oscilloscope 
(Refer to 

P.13A-348

), its maximum value 

should be 4.8 V or more, and its minimum 
value should be 0.6 V or less with no noise in 
waveform.

Q: Is the check result normal? 

YES : 

Go to Step 9 .

NO : 

Go to Step 14 .

STEP 14. Connector check: B-106 engine control 
relay connector.

Q: Is the check result normal? 

YES : 

Go to Step 15 .

NO : 

Repair or replace the connector.

1

2

3

AK402009

Connector: A-110

AC

A-110 (B)

A-110 Harness side
connector

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2

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4

AK402060

B-106
J/B side 
connector

B-106

Connector: B-106
J/B (front side)

AC

Main

Index

Group

TOC