Mitsubishi Lancer Evolution 7. Manual — part 194
MPI -
Troubleshooting
13A-75
Inspection Procedure 17
Abnormal odor, white smoke, black smoke, high CO or HC
concentration when idling
Probable cause
Causes shown on right are suspected.
D
Air/fuel ratio control system malfunction
D
Ignition system malfunction
D
Fuel system malfunction
D
Intake and exhaust system malfunction
D
Exhaust gas purifier system malfunction
D
Improper compression pressure
D
Catalyst defect
D
Engine-ECU malfunction
OK
To the next page
OK
Check the fuel pressure. (Refer to P.13A-128.)
OK
MUT-II Data list
D
No. 59: Oxygen sensor (rear)
(Refer to P.13A-105.)
NG
Check the Code No. P0136: Oxygen sensor (rear) system.
(Refer to P.13A-27.)
OK
MUT-II Data list
D
No. 11: Oxygen sensor (front) (Refer to P.13A-102.)
NG
Check the Code No. P0130: Oxygen sensor (front) system.
(Refer to P.13A-24.)
OK
Check for exhaust gas leaks from exhaust manifold.
NG
Repair
OK
Check the air intake from the intake hose and intake manifold.
NG
Repair
OK
MUT-II Data list
D
No. 12: Air flow sensor
D
No. 13: Intake air temperature sensor
D
No. 21: Engien coolant temperature sensor
D
No. 25: Barometric pressure sensor
(Refer to P.13A-102.)
<Reference>
Proceed to OK if all service data values are correct.
Proceed to NG if there is even one abnormal service data value.
NG
Refer to inspections for diagnosis code of sensor showing
abnormal service data. (Refer to P.13A-102.)
OK
Check the ignition timing.
(Refer to GROUP 11 - Engine Adjustment.)
NG
Check the Inspection Procedure 15: Deviation of ignition interval
(Refer to P.13A-73.)
NO
MUT-II Actuator test
D
No. 01: No. 1 injector
D
No. 02: No. 2 injector
D
No. 03: No. 3 injector
D
No. 04: No. 4 injector
OK: The idling state changes.
D
Proceed to NG if the cylinder (NG cylinder) for which the idling
state did not change when injector was stopped is pinpointed.
D
Proceed to OK if all cylinders are OK, or if the NG cylinder
cannot be pinpointed.
NG
Check the Code No. P0201: No. 1 injector system, P0202: No. 2
injector system, P0203: No. 3 injector system and P0204: No. 4
injector system. (Refer to P.13A-30, 31, 32, 33.)
MUT-II Self-Diag code
D
Is a diagnosis code output?
YES
INSPECTION CHART FOR DIAGNOSIS CODE
(Refer to P.13A-12.)
MPI -
Troubleshooting
13A-76
NG
Replace the engine-ECU.
Check the trouble symptoms.
OK
End
NG
Replace the catalyst.
Check the trouble symptoms.
OK
End
OK
Replace the injectors for all cylinders.
OK
Check the compression pressure.
(Refer to GROUP 11 - Engine Adjustment.)
NG
Repair
OK
Check the ignition coil parts.
(Refer to GROUP 16 - Ignition Device.)
NG
Replace the ignition coil.
OK
Check the spark plug. (Refer to GROUP 16 - Ignition Device.)
NG
Replace the spark plug.
OK
Check the spark plug cable.
(Refer to GROUP 16 - Ignition Device.)
NG
Replace the spark plug cable.
OK
Check the PCV valve.
(Refer to GROUP 17 - Exhaust Gas Purifier Check.)
NG
Replace the PCV valve.
OK
Check the EGR valve for sticking.
(Refer to GROUP 17 - Exhaust Gas Purifier Check.)
NG
Replace the EGR valve.
OK
Check the EGR control solenoid valve.
(Refer to GROUP 17 - Exhaust Gas Purifier Check.)
NG
Replace the EGR control solenoid valve.
OK
Check the purge control solenoid valve.
(Refer to GROUP 17 - Exhaust Gas Purifier Check.)
NG
Replace the purge control solenoid valve.
From the previous page
MPI -
Troubleshooting
13A-77
Inspection Procedure 18
Battery dies
Probable cause
Causes shown on right are suspected.
D
Battery malfunction
D
G terminal short-circuit
D
Alternator malfunction
D
Engine-ECU malfunction
OK
To the next page
OK
Check the following connector:
C-122
NG
Repair
OK
Replace the alternator.
NG
OK
Check the harness between the
alternator and ignition switch.
D
Check for damage of the power
cable.
Repair
NG
OK
Check the harness between the
alternator intermediate connector and
alternator.
D
Check for disconnection and
short-circuit of the power cable.
Repair
NG
OK
Check the harness between the
alternator intermediate connector and
alternator.
D
Check for short-circuit of the output
cable.
Repair
OK
Measure at the B-14 alternator
intermediate connector.
D
Disconnect the connector to
measure at the male connector
side.
D
Ignition switch: ON
D
Voltage between terminal No. 10
and earth
OK: System voltage
NG
Check the following connector:
B-22
NG
Repair
OK
Check and repair the harness between
the alternator intermediate connector
and ignition switch.
D
Check for disconnection and
short-circuit of the power cable.
OK
Measure at the B-14 alternator
intermediate connector.
D
Disconnect the connector to
measure at the female connector
side.
D
Ignition switch: ON
D
Voltage between terminal No. 9 and
earth
OK: System voltage
NG
Check the following connectors:
C-130, C-01, C-213, C-29 <L.H.
drive vehicles>
NG
Repair
OK
Check the following connector:
B-14
NG
Repair
Check the battery.
(Refer to GROUP 54 - Battery.)
NG
Replace the battery.
MPI -
Troubleshooting
13A-78
NG
Replace the engine-ECU.
OK
Check the trouble symptoms.
OK
Intermittent malfunction
(Refer to GROUP 00 - Points to Note
for Intermittent Malfunctions.)
OK
Measure at the C-122 engine-ECU
connector.
D
Measure the engine-ECU terminal
voltage.
D
Engine: Idling (after warm-up)
D
Radiator fan: Stopped
D
Voltage between terminal No. 33
and earth
OK: Voltage rises 0.2 to 3.5 V
when headlamp is turned
OFF and ON.
NG
Check the charging device.
(Refer to GROUP 16 - Charging
Device.)
OK
Measure at the C-122 engine-ECU
connector.
D
Disconnect the connector to
measure at the harness side.
D
Ignition switch: ON
D
Voltage between terminal No. 33
and earth
OK: System voltage
NG
Check and repair the harness between
the alternator intermediate connector
and engine-ECU.
D
Check for short-circuit of output
cable.
From the previous page
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