Mitsubishi Lancer Evolution IX. Manual — part 425
TROUBLESHOOTING
MULTIPORT FUEL INJECTION (MPI)
13A-175
Code No. P0403: Exhaust Gas Recirculation (EGR) Control Solenoid Valve
1
2
3
4
AK501814
1
2
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
Engine control relay
B-12X
B-14
EGR control solenoid valve
1
2
2
6
6
Engine-ECU
EGR control solenoid valve circuit
G-O
G-O
R-Y
B-Y
B-Y
B-Y
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-121
(MU803784)
B-101
6 <A-13> (*1) or
13 <C-31> (*2)
AB
NOTE
*1: L.H. drive vehicles
*2: R.H. drive vehicles
2
1
4
3
To engine-ECU
TROUBLESHOOTING
MULTIPORT FUEL INJECTION (MPI)
13A-176
OPERATION
• Power is supplied to the EGR control solenoid
valve (terminal No. 1) from the engine control
relay (terminal No. 4).
• The engine-ECU (terminal No. 6) makes the
power transistor in the unit be in "ON", and that
makes currents go on the EGR control solenoid
valve (terminal No. 2).
FUNCTION
• In response to the signal from the engine-ECU,
the EGR control solenoid valve controls the oper-
ation of the EGR valve.
TROUBLE JUDGMENT
Check Condition
• The battery voltage is 10 V or more.
Judgment Criterion
• When the EGR control solenoid valve is turned to
"LOCK" (OFF) position from "ON" position, none
of solenoid coil surge voltage (system voltage of
+2 V) is detected.
PROBABLE CAUSES
• Failed EGR control solenoid valve
• Open/short circuit in EGR control solenoid valve
circuit or loose connector contact
• Failed engine-ECU
DIAGNOSIS PROCEDURE
STEP 1. M.U.T.-II/III actuator test
• Item No. 10: EGR 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-101 EGR 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-101 EGR control solenoid valve connector.
• Disconnect connector, and measure at solenoid
valve side.
• Resistance between terminal No. 1 and No. 2.
OK: 29
− 35 Ω (at 20°C)
Q: Is the check result normal?
YES :
Go to Step 4 .
NO :
Replace the EGR control solenoid valve.
AK305024
1
2
AB
Connector : B-101
Harness side
connector
B-101(BR)
AK305024
1
2
AB
Connector : B-101
Harness side
connector
B-101(BR)
TROUBLESHOOTING
MULTIPORT FUEL INJECTION (MPI)
13A-177
STEP 4. Perform voltage measurement at B-101
EGR 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 intermediate connector B-14, and
repair if necessary. If intermediate
connector is normal, check and repair
harness between B-101 (terminal No. 1)
EGR 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.
AK305024
1
2
AB
Connector : B-101
Harness side
connector
B-101(BR)
AK305003
2
1
3
4
AB
Connector : B-12X
B-12X
Harness side
connector
Relay box’s
triangle marks
AK305024
1
2
AB
Connector : B-101
Harness side
connector
B-101(BR)
TROUBLESHOOTING
MULTIPORT FUEL INJECTION (MPI)
13A-178
STEP 6. Perform voltage measurement at C-121
engine-ECU connector.
• Disconnect connector, and measure at harness
side.
• Ignition switch: "ON"
• Voltage between terminal No. 6 and earth.
OK: System voltage
Q: Is the check result normal?
YES :
Go to Step 8 .
NO :
Go to Step 7 .
STEP 7. Connector check: C-121 engine-ECU
connector
Q: Is the check result normal?
YES :
Check intermediate connector B-14, and
repair if necessary. If intermediate
connector is normal, check and repair
harness between B-101 (terminal No. 2)
EGR control solenoid valve connector and
C-121 (terminal No. 6) engine-ECU
connector.
• Check output line for open/short
circuit.
NO :
Repair or replace the connector.
AK501995
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
31
32
33
34
35
1
10
AB
Connector: C-121
C-121 (GR)
C-121 (GR)
Harness side connector
<L. H. drive vehicles>
<R. H. drive vehicles>
AK501995
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
31
32
33
34
35
1
10
AB
Connector: C-121
C-121 (GR)
C-121 (GR)
Harness side connector
<L. H. drive vehicles>
<R. H. drive vehicles>
AK305024
1
2
AB
Connector : B-101
Harness side
connector
B-101(BR)
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