Mitsubishi Lancer Evolution IX. Manual — part 432
TROUBLESHOOTING
MULTIPORT FUEL INJECTION (MPI)
13A-203
Code No. P0622: Alternator FR Terminal System
OPERATION
• The energized state of the alternator field coil is
inputted from the alternator (terminal No. 4) to the
engine-ECU (terminal No. 52).
FUNCTION
• A signal of the power supply duty ratio for the
alternator field coil is inputted to the engine-ECU.
• In response to the signal, the engine-ECU
detects the alternator output current and controls
the idling speed according to the output current
(electric load).
TROUBLE JUDGMENT
Check Condition
• Engine speed is 50 r/min. or more.
Judgment Criterion
• Input voltage from alternator FR terminal is the
system voltage or more for 20 seconds.
PROBABLE CAUSES
• Open circuit in alternator FR terminal circuit
• Failed engine-ECU
AK501820
M
1
2
3
4
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
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
Engine-ECU
Alternator
B-25
(MU802066)
52
W
W
B-14
5
4
Alternator FR terminal circuit
IC Voltage
regulator
AB
C-119
(MU803782)
TROUBLESHOOTING
MULTIPORT FUEL INJECTION (MPI)
13A-204
DIAGNOSIS PROCEDURE
STEP 1. Connector check: B-14 intermediate
connector
Q: Is the check result normal?
YES :
Go to Step 2 .
NO :
Repair or replace the connector.
STEP 2. Perform voltage measurement at B-14
intermediate connector.
• Disconnect connector, and measure at male con-
nector side.
• Ignition switch: "ON"
• Voltage between terminal No. 5 and earth.
OK: System voltage
Q: Is the check result normal?
YES :
Go to Step 6 .
NO :
Go to Step 3 .
STEP 3. Connector check: C-119 engine-ECU
connector
Q: Is the check result normal?
YES :
Go to Step 4 .
NO :
Repair or replace the connector.
AK305035
3
4
5
8
9
1
2
6
7
10
Connector : B-14
Female side
connector
B-14(B)
AC
AK401753
1
2 3
6
7 8
4 5
9 10
Connector : B-14
Male side
connector
B-14(B)
AB
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>
TROUBLESHOOTING
MULTIPORT FUEL INJECTION (MPI)
13A-205
STEP 4. Check harness between B-14 (terminal
No. 5) intermediate connector and C-119
(terminal No. 52) engine-ECU connector.
• Check output line for short circuit.
Q: Is the check result normal?
YES :
Go to Step 5 .
NO :
Repair the damaged harness wire.
STEP 5. Check the trouble symptoms.
Q: Does trouble symptom persist?
YES :
Replace the engine-ECU.
NO :
Intermittent malfunction (Refer to GROUP
00
− How to Use
Troubleshooting/Inspection Service Points
).
STEP 6. Perform voltage measurement at B-14
intermediate connector.
• Use special tool test harness (MB991658) to con-
nect connector, and measure at pick-up harness.
• Ignition switch: "ON"
• Voltage between terminal No. 5 and earth.
OK: System voltage
Q: Is the check result normal?
YES :
Go to Step 9 .
NO :
Go to Step 7 .
STEP 7. Connector check: B-25 alternator
connector
Q: Is the check result normal?
YES :
Go to Step 8 .
NO :
Repair or replace the connector.
AK305035
3
4
5
8
9
1
2
6
7
10
Connector : B-14
Female side
connector
B-14(B)
AC
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>
AK305035
3
4
5
8
9
1
2
6
7
10
Connector : B-14
Female side
connector
B-14(B)
AC
AK305036
M
2
1
3
4
Harness side
connector
AB
Connector : B-25
B-25(GR)
TROUBLESHOOTING
MULTIPORT FUEL INJECTION (MPI)
13A-206
STEP 8. Check harness between B-25 (terminal
No. 4) alternator connector and B-14 (terminal
No. 5) intermediate connector.
• Check output line for short circuit.
Q: Is the check result normal?
YES :
Replace the alternator.
NO :
Repair the damaged harness wire.
STEP 9. Perform voltage measurement at B-14
intermediate connector.
• Use special tool test harness (MB991658) to con-
nect connector, and measure at pick-up harness.
• Engine: Idle after warm-up
• Transmission: Neutral
• Radiator fan: Inactive
• Voltage between terminal No. 5 and earth.
OK: Switching the headlamps to ON from
OFF causes the voltage to fall.
Q: Is the check result normal?
YES :
Go to Step 5 .
NO :
Go to Step 10 .
STEP 10. Connector check: B-25 alternator
connector
Q: Is the check result normal?
YES :
Go to Step 11 .
NO :
Repair or replace the connector.
AK305036
M
2
1
3
4
Harness side
connector
AB
Connector : B-25
B-25(GR)
AK305035
3
4
5
8
9
1
2
6
7
10
Connector : B-14
Female side
connector
B-14(B)
AC
AK305035
3
4
5
8
9
1
2
6
7
10
Connector : B-14
Female side
connector
B-14(B)
AC
AK305036
M
2
1
3
4
Harness side
connector
AB
Connector : B-25
B-25(GR)
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