Mitsubishi Colt Ralliart. Manual - part 703

TROUBLESHOOTING

MULTIPORT FUEL INJECTION (MPI) <4G1>

13B-137

STEP 6. Check harness between A-105 (terminal 
No. 2) No. 4 injector connector and A-114 
(terminal No. 24) engine-ECU connector.

• Check earthing line for damage.

Q: Is the check result normal?

YES : 

 Go to Step 7 .

NO : 

Repair the damaged harness wire.

STEP 7. Fuel pressure measurement.

• Fuel pressure measurement (Refer to Fuel Pres-

sure Test 

P.13B-358

).

Q: Is the check result normal?

YES : 

Go to Step 8 .

NO : 

Repair the fuel pressure.

STEP 8. M.U.T.-III diagnosis code.

• Reconfirmation of diagnosis code.

Q: Is the diagnosis code set?

YES : 

Replace engine-ECU.

NO : 

Intermittent malfunction (Refer to GROUP 
00 

− How to Use 

Troubleshooting/Inspection Service Points 

− 

How to Cope with Intermittent Malfunctions 

P.00-13

).

AK402091

M

1

2

A-105(G)

AC

Connector: A-105

Harness side 
connector

AK402745

6

4

2

5

3

1

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66

L

AF

A-114

Connector: 

A-114

Harness side connector

Engine-ECU

Battery

Main

Index

Group

TOC

TROUBLESHOOTING

MULTIPORT FUEL INJECTION (MPI) <4G1>

13B-138

Code No. P0325: Detonation Sensor System

OPERATION

• The sensor signal is input to the engine-ECU (ter-

minal No. 20) from the detonation sensor (termi-
nal No. 2).

FUNCTION

• The detonation sensor detects vibration of the 

cylinder block resulting from knocking and inputs 
a signal to the engine-ECU.

• In response to the signal, the engine-ECU pro-

vides ignition-timing retarding control while 
knocking condition persists.

TROUBLE JUDGEMENT

Check Conditions

• 2 seconds later from when engine starts

• Engine speed is more than 2,500 r/min.

• The volume efficiency is more than a prescribed 

value.

Judgement Criterion

• When the amount of the change of continuous-

ness 200 times and the knock sensor output volt-
ages is minute.

PROBABLE CAUSES

• Failed detonation sensor

• Open/short circuit in or damage to detonation 

sensor circuit, or loose connector contact

• Failed engine-ECU

AK402688

1 2

19

21

20

18

17

16

15

14

1213

11

8 9

L

10

37
52 53 54 555657585960616263646566

38 39 404142434445464748495051

22 23 24 252627282930313233343536

7

5

3

1

6

4

2

20

21

Detonation sensor

B

R

2

1

A-128

A-114

Detonation Sensor Circuit

AD

Wire colour code
B: Black  LG: Light green  G: Green  L: Blue  W: White  Y: Yellow  SB: Sky blue  BR: Brown  O: Orange  GR: Gray
R: Red  P: Pink  V: Violet

  P: Purple

Engine-ECU

Main

Index

Group

TOC

TROUBLESHOOTING

MULTIPORT FUEL INJECTION (MPI) <4G1>

13B-139

DIAGNOSIS PROCEDURE

STEP 1. Connector check: A-128 detonation 
sensor connector

Q: Is the check result normal?

YES : 

Go to Step 2 .

NO : 

Repair or replace.

STEP 2. Perform resistance measurement at 
A-128 detonation 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 4 .

NO : 

Go to Step 3 .

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

Q: Is the check result normal?

YES : 

Check and repair if necessary the harness 

between A-128 (terminal No. 1) detonation 
sensor connector and A-114 (terminal No. 
21) engine-ECU connector.

NO : 

Repair or replace.

AK402094

2 1

AD

Connector: A-128

Harness side 
connector

A-128

AK402094

2 1

AD

Connector: A-128

Harness side 
connector

A-128

AK402745

6

4

2

5

3

1

9

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64

65

66

L

AF

A-114

Connector: 

A-114

Harness side connector

Engine-ECU

Battery

Main

Index

Group

TOC

TROUBLESHOOTING

MULTIPORT FUEL INJECTION (MPI) <4G1>

13B-140

STEP 4. Connector check: A-114 engine-ECU 
connector

Q: Is the check result normal?

YES : 

Go to Step 5 .

NO : 

Repair or replace.

STEP 5. Check harness between A-128 (terminal 
No. 2) detonation sensor connector and A-114 
(terminal No. 20) engine-ECU connector.

• Check output line for open/short circuit and dam-

age.

Q: Is the check result normal?

YES : 

Go to Step 6 .

NO : 

Repair.

AK402745

6

4

2

5

3

1

9

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58

59

60

61

62

63

64

65

66

L

AF

A-114

Connector: 

A-114

Harness side connector

Engine-ECU

Battery

AK402094

2 1

AD

Connector: A-128

Harness side 
connector

A-128

AK402745

6

4

2

5

3

1

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64

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66

L

AF

A-114

Connector: 

A-114

Harness side connector

Engine-ECU

Battery

Main

Index

Group

TOC