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
).
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
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
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