Mitsubishi Lancer Evolution IX. Manual - part 409

TROUBLESHOOTING

MULTIPORT FUEL INJECTION (MPI)

13A-111

Code No. P0202: No. 2 Injector System

AK501809

1

2

1

2

1

2

1

2

1 2 3

4 5 6

2

3 4

5 6

7 8

9

11 12 13 14 15 16 17 18 19 20

30

21 22 23

24 25

26 27 28 29

3132 33

34 35

1

10

1

2

3

4

B-12X

Injector
No.1

Injector
No.2

Injector
No.3

Injector resistor

Injector
No.4

B-22

MU802722

B-20

(MU802722)

B-18

(MU802722)

B-17

(MU802722)

B-119

MU802607

4

28

29

3

1

1

4

5

6

1

1

1

2

2

2

2

3

1

2

1

9

24

2

C-121

(MU803784)

Injector circuit

Battery

Engine-ECU

B-Y

B-Y

R-Y

To engine-ECU

R-Y

R

R-W

R-L

R-B

O

W-R

G

R

B-Y

Engine control relay

J/C (6)
C-105

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  PU: Purple

AB

6 <A-13> (*1) or
13 <C-31> (*2)

NOTE

*1: L.H. drive vehicles
*2: R.H. drive vehicles

TROUBLESHOOTING

MULTIPORT FUEL INJECTION (MPI)

13A-112

OPERATION

• Power is supplied to the injector (terminal No. 1) 

from the engine control relay (terminal No. 4) via 
the injector resistor.

• The engine-ECU (terminal No. 9) makes the 

power transistor in the unit be in "ON" position, 
and that makes currents go on the injector (termi-
nal No. 2).

FUNCTION

• The engine-ECU controls the power supply inter-

val of the injector.

• The fuel injection amount of the injector depends 

on the power supply interval.

TROUBLE JUDGMENT

Check Conditions

• The engine speed is 50 − 1,000 r/min.

• The throttle position sensor output voltage is 1.15 

V or less.

• Injector not in forced drive (actuator test) mode.

Judgment Criterion

• No surge voltage of the injector detected for 2 

seconds.

PROBABLE CAUSES

• Failed No. 2 injector

• Open/short circuit in No. 2 injector circuit or loose 

connector contact

• Failed engine-ECU 

DIAGNOSIS PROCEDURE

STEP 1. M.U.T.-II/III actuator test

• Item No. 02: No. 2 injector

OK: Idling state varies.

Q: Is the check result normal? 

YES : 

Intermittent malfunction (Refer to GROUP 

00 

− How to Use 

Troubleshooting/Inspection Service Points 

P.00-5

).

NO : 

Go to Step 2 .

STEP 2. Connector check: B-20 No. 2 injector 
connector

Q: Is the check result normal? 

YES : 

Go to Step 3 .

NO : 

Repair or replace the connector.

STEP 3. Perform resistance measurement B-20 
No. 2 injector connector.

• Disconnect connector, and measure at injector 

side.

• Resistance between terminal No. 1 and No. 2.

OK: 2 

− 3 Ω

Q: Is the check result normal? 

YES : 

Go to Step 4 .

NO : 

Replace the No. 2 injector.

AK305012

1

2

Connector : B-20

Harness side connector

B-20(B)

AD

AK305012

1

2

Connector : B-20

Harness side connector

B-20(B)

AD

TROUBLESHOOTING

MULTIPORT FUEL INJECTION (MPI)

13A-113

STEP 4. Perform voltage measurement at B-20 
No. 2 injector connector.

• Disconnect connector, and measure at harness 

side.

• Ignition switch: "ON" 

• Voltage between terminal No. 1 and earth.

OK: System voltage

Q: Is the check result normal? 

YES : 

Go to Step 8 .

NO : 

Go to Step 5 .

STEP 5. Connector check: B-12X engine control 
relay connector

Q: Is the check result normal? 

YES : 

Go to Step 6 .

NO : 

Repair or replace the connector.

STEP 6. Check injector resistor itself.

• Check injector resistor itself (Refer to 

P.13A-407

)

Q: Is the check result normal? 

YES : 

Go to Step 7 .

NO : 

Replace the injector resistor.

STEP 7. Check harness between B-119 (terminal 
No. 4) injector resistor connector and B-20 
(terminal No. 1) No. 2 injector connector.

• Check power supply line for open/short circuit.

AK305012

1

2

Connector : B-20

Harness side connector

B-20(B)

AD

AK305003

2

1

3

4

AB

Connector : B-12X

B-12X

Harness side 
connector

Relay box’s
triangle marks

AK305016

1

2

3

4

5

6

AB

Harness side 
connector

B-119(B)

B-119(B)

Connector : B-119

<L.H.drive vehicles>

<R.H.drive vehicles>

AK305012

1

2

Connector : B-20

Harness side connector

B-20(B)

AD

AK305003

2

1

3

4

AB

Connector : B-12X

B-12X

Harness side 
connector

Relay box’s
triangle marks

TROUBLESHOOTING

MULTIPORT FUEL INJECTION (MPI)

13A-114

Q: Is the check result normal? 

YES : 

Check intermediate connector C-105, and 

repair if necessary. If intermediate 
connector are normal, check and repair 
harness between B-119 (terminal No. 3) 
injector resistor connector and B-12X 
(terminal No. 4) engine control relay 
connector.

• Check power supply line for 

open/short circuit.

NO : 

Repair the damaged harness wire.

STEP 8. Check harness between B-119 (terminal 
No. 4) injector resistor connector and B-20 
(terminal No. 1) No. 2 injector connector.

• Check power supply line for damage.

Q: Is the check result normal? 

YES : 

Go to Step 9 .

NO : 

Repair the damaged harness wire.

STEP 9. Check harness between B-119 (terminal 
No. 3) injector resistor connector and B-12X 
(terminal No. 4) engine control relay connector.

NOTE: Before checking harness, check intermediate 
connector C-105, and repair if necessary.

• Check power supply line for damage.

Q: Is the check result normal? 

YES : 

Go to Step 10 .

NO : 

Repair the damaged harness wire.

AK305016

1

2

3

4

5

6

AB

Harness side 
connector

B-119(B)

B-119(B)

Connector : B-119

<L.H.drive vehicles>

<R.H.drive vehicles>

AK305012

1

2

Connector : B-20

Harness side connector

B-20(B)

AD

AK305016

1

2

3

4

5

6

AB

Harness side 
connector

B-119(B)

B-119(B)

Connector : B-119

<L.H.drive vehicles>

<R.H.drive vehicles>

AK305003

2

1

3

4

AB

Connector : B-12X

B-12X

Harness side 
connector

Relay box’s
triangle marks