Mitsubishi Lancer Evolution IX. Manual — part 418
TROUBLESHOOTING
MULTIPORT FUEL INJECTION (MPI)
13A-147
STEP 7. Connector check: B-119 injector resistor
connector and C-121 engine-ECU connector
Q: Is the check result normal?
YES :
Go to Step 8 .
NO :
Repair or replace the connector.
STEP 8. Check harness between B-119 (terminal
No. 5) injector resistor connector and B-18
(terminal No. 1) No.3 injector connector.
• Check output line for damage.
Q: Is the check result normal?
YES :
Go to Step 9 .
NO :
Repair the damaged harness wire.
STEP 9. Fuel pressure measurement.
• Fuel pressure measurement (Refer to fuel pres-
Q: Is the check result normal?
YES :
Replace the engine-ECU.
NO :
Repair.
AK305016
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2
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5
6
AB
Harness side
connector
B-119(B)
B-119(B)
Connector : B-119
<L.H.drive vehicles>
<R.H.drive vehicles>
AK501995
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AB
Connector: C-121
C-121 (GR)
C-121 (GR)
Harness side connector
<L. H. drive vehicles>
<R. H. drive vehicles>
AK305016
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2
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5
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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-18
Harness side connector
B-18(B)
AE
TROUBLESHOOTING
MULTIPORT FUEL INJECTION (MPI)
13A-148
Code No. P0304: No. 4 Cylinder Misfire Detection System
OPERATION
• Refer to P0204 injector circuit
FUNCTION
• If a misfire occurs while the engine is running, the
engine speed changes for an instant.
• The engine-ECU checks for such changes in
engine speed.
TROUBLE JUDGMENT
Check Conditions
• The engine speed is 500 − 6,500 r/min.
• The engine coolant temperature is −10°C or
higher.
• The barometric pressure is 76 kPa or more.
• The volumetric efficiency is 30 − 55%.
• The adaptive learning has been completed with
the vane that generates the crankshaft position
signals.
• During the engine operation except the shift
change or low speed driving and rapid accelera-
tion and deceleration, also intermittent operation
of air compressor (A/C: within the 3 seconds after
changing to ON from OFF or to OFF from ON).
• The throttle deviation is within the range of −0.06
V/10ms to 0.06 V/10ms.
Judgment Criteria
• Misfire has occurred more frequently than
allowed during the last 200 revolutions (When the
catalyst temperature is higher than 950
°C).
or
• Misfire has occurred in 15 or more of the last
1,000 revolutions (corresponding to 1.5 times the
limit of emission standard).
PROBABLE CAUSES
• Ignition system related part(s) failed
• Low compression pressure
• Failed engine-ECU
DIAGNOSIS PROCEDURE
STEP 1. Check the ignition coil spark.
Q: Is the check result normal?
YES :
Go to Step 2 .
NO :
Check ignition Circuit System (Refer to
Inspection procedure 30 <L.H. drive
vehicles>
or Inspection
procedure 31 <R.H. drive
vehicles>
STEP 2. Connector check: B-17 No. 4 injector
connector
Q: Is the check result normal?
YES :
Go to Step 3 .
NO :
Repair or replace the connector.
STEP 3. Check No. 4 injector itself.
• Check Injector itself (Refer to
).
Q: Is the check result normal?
YES :
Go to Step 4 .
NO :
Replace the No. 4 injector.
AK305012
1
2
Connector : B-17
Harness side connector
B-17(B)
AF
TROUBLESHOOTING
MULTIPORT FUEL INJECTION (MPI)
13A-149
STEP 4. Connector check: C-121 engine-ECU
connector
Q: Is the check result normal?
YES :
Go to Step 5 .
NO :
Repair or replace the connector.
STEP 5. Check harness between B-17 (terminal
No. 2) No. 4 injector connector and C-121
(terminal No. 2) engine-ECU connector.
• Check output line for damage.
Q: Is the check result normal?
YES :
Go to Step 6 .
NO :
Repair the damaged harness wire.
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.
AK501995
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30
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35
1
10
AB
Connector: C-121
C-121 (GR)
C-121 (GR)
Harness side connector
<L. H. drive vehicles>
<R. H. drive vehicles>
AK305012
1
2
Connector : B-17
Harness side connector
B-17(B)
AF
AK501995
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30
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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>
TROUBLESHOOTING
MULTIPORT FUEL INJECTION (MPI)
13A-150
STEP 7. Connector check: B-119 injector resistor
connector and C-121 engine-ECU connector
Q: Is the check result normal?
YES :
Go to Step 8 .
NO :
Repair or replace the connector.
STEP 8. Check harness between B-119 (terminal
No. 6) injector resistor connector and B-18
(terminal No. 1) No. 4 injector connector.
• Check output line for damage.
Q: Is the check result normal?
YES :
Go to Step 9 .
NO :
Repair the damaged harness wire.
STEP 9. Fuel pressure measurement.
• Fuel pressure measurement (Refer to fuel pres-
Q: Is the check result normal?
YES :
Replace the engine-ECU.
NO :
Repair.
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>
AK501995
2
3
4
5
6
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30
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31
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35
1
10
AB
Connector: C-121
C-121 (GR)
C-121 (GR)
Harness side connector
<L. H. drive vehicles>
<R. H. drive vehicles>
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-18
Harness side connector
B-18(B)
AE
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