Mitsubishi Lancer Evolution IX. Manual — part 386
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TROUBLESHOOTING
MULTIPORT FUEL INJECTION (MPI)
13A-19
INSPECTION PROCEDURE FOR
DIAGNOSIS CODES
Code No. P0090: Fuel Pressure Control Solenoid Valve System
AK501799
65
43
50
42
49
41
48
60 61
64
46 47
58 59
67 68
45
56
66
52
51
44
53
62
54
63
57
55
1
2
3
4
1
2
Engine control relay
To engine-ECU
B-12X
Fuel pressure control solenoid valve
1
2
48
Engine-ECU
Fuel pressure control solenoid valve circuit
W-B
R-Y
Battery
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
C-119
(MU803782)
B-28
(MU802722)
B-Y
6 <A-13> (*1) or
13 <C-31> (*2)
B-Y
B-Y
AB
NOTE
*1: L.H. drive vehicles
*2: R.H. drive vehicles
2
1
4
3
![](/vehicles/winoney/wruvea/ger/wonco.png)
TROUBLESHOOTING
MULTIPORT FUEL INJECTION (MPI)
13A-20
OPERATION
• Power is supplied from the engine control relay
(terminal No. 4) to the fuel pressure control sole-
noid valve (terminal No. 1).
• The engine-ECU (terminal No. 48) causes the
power transistor in the unit to be ON to supply
power to the fuel pressure control solenoid valve
(terminal No. 2).
FUNCTION
• In response to a signal from the engine-ECU, the
fuel pressure control solenoid valve switches the
pressure to be introduced into the fuel pressure
regulator between the intake manifold negative
pressure and atmospheric pressure.
TROUBLE JUDGMENT
Check Condition
• Battery voltage is 10 V or more.
Judgment Criterion
• Surge voltage cannot be detected within 1 sec-
onds from the time when the fuel pressure control
solenoid valve has changed from ON to OFF.
PROBABLE CAUSES
• Failed fuel pressure control solenoid valve
• Open/short circuit in fuel pressure control sole-
noid valve circuit or loose connector contact
• Failed engine-ECU
DIAGNOSIS PROCEDURE
STEP 1. M.U.T.-II/III actuator test
• Item No. 09: Fuel pressure control solenoid valve
OK: Operating sound can be heard and the
valve vibrates.
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-28 fuel pressure
control solenoid valve connector
Q: Is the check result normal?
YES :
Go to Step 3 .
NO :
Repair or replace the connector.
STEP 3. Perform resistance measurement at B-28
fuel pressure control solenoid valve connector.
• Disconnect connector, and measure at solenoid
valve side.
• Resistance between terminal No. 1 and No. 2.
OK: 28
− 36 Ω (at 20°C)
Q: Is the check result normal?
YES :
Go to Step 4 .
NO :
Replace the fuel pressure control solenoid
valve.
AK305002
1
2
AB
Connector : B-28
Harness side
connector
B-28(B)
AK305002
1
2
AB
Connector : B-28
Harness side
connector
B-28(B)
![](/vehicles/winoney/wruvea/ger/kans.png)
TROUBLESHOOTING
MULTIPORT FUEL INJECTION (MPI)
13A-21
STEP 4. Perform voltage measurement at B-28
fuel pressure control solenoid valve 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 6 .
NO :
Go to Step 5 .
STEP 5. Connector check: B-12X engine control
relay connector
Q: Is the check result normal?
YES :
Check and repair harness between B-28
(terminal No. 1) fuel pressure control
solenoid valve connector and B-12X
(terminal No. 4) engine control relay
connector.
• Check power supply line for
open/short circuit.
NO :
Repair or replace the connector.
STEP 6. Perform voltage measurement at C-119
engine-ECU connector.
• Disconnect connector, and measure at harness
side.
• Ignition switch: "ON"
• Voltage between terminal No. 48 and earth.
OK: System voltage
Q: Is the check result normal?
YES :
Go to Step 8 .
NO :
Go to Step 7 .
AK305002
1
2
AB
Connector : B-28
Harness side
connector
B-28(B)
AK305003
2
1
3
4
AB
Connector : B-12X
B-12X
Harness side
connector
Relay box’s
triangle marks
AK305002
1
2
AB
Connector : B-28
Harness side
connector
B-28(B)
AK501994
65
43
50
42
49
41
48
60
61
64
46
47
58
59
67
68
45
56
66
52 51
44
53
62
54
63
57
55
AB
Connector: C-119
C-119 (GR)
C-119 (GR)
Harness side connector
<L. H. drive vehicles>
<R. H. drive vehicles>
![](/vehicles/winoney/wruvea/ger/mef.png)
TROUBLESHOOTING
MULTIPORT FUEL INJECTION (MPI)
13A-22
STEP 7. Connector check: C-119 engine-ECU
connector
Q: Is the check result normal?
YES :
Check and repair harness between B-28
(terminal No. 2) fuel pressure control
solenoid valve connector and C-119
(terminal No. 48) engine-ECU connector.
• Check output line for open/short
circuit.
NO :
Repair or replace the connector.
STEP 8. Connector check: C-119 engine-ECU
connector
Q: Is the check result normal?
YES :
Go to Step 9 .
NO :
Repair or replace the connector.
AK501994
65
43
50
42
49
41
48
60
61
64
46
47
58
59
67
68
45
56
66
52 51
44
53
62
54
63
57
55
AB
Connector: C-119
C-119 (GR)
C-119 (GR)
Harness side connector
<L. H. drive vehicles>
<R. H. drive vehicles>
AK305002
1
2
AB
Connector : B-28
Harness side
connector
B-28(B)
AK501994
65
43
50
42
49
41
48
60
61
64
46
47
58
59
67
68
45
56
66
52 51
44
53
62
54
63
57
55
AB
Connector: C-119
C-119 (GR)
C-119 (GR)
Harness side connector
<L. H. drive vehicles>
<R. H. drive vehicles>
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