Mitsubishi Lancer Evolution 7. Manual — part 191
MPI -
Troubleshooting
13A-63
Inspection Procedure 8
Unstable idling (Rough idling, hunting), inappropriate
idling speed (High or low idling speed), engine stalls (Die
out) during idling
Probable cause
Causes shown on right are suspected.
D
Idle speed control system malfunction
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
Throttle valve malfunction
D
Timing belt malfunction
D
Improper compression pressure
D
Engine-ECU malfunction
OK
To the next page
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 the throttle body (throttle valve section) for contamination.
NG
Clean the throttle body (throttle valve section).
(Refer to P.13A-126.)
OK
Check the air intake from the intake hose and intake manifold.
NG
Repair
OK
Check the timing marks on the timing belt.
NG
Align the timing marks on the timing belt.
OK
MUT-II Data list
D
No. 27: Power steering fluid pressure switch
(Refer to P.13A-103.)
NG
Check the Power steering fluid pressure switch system. (Refer to
P.13A-51, PROCEDURE FOR DAIGNOSIS CODE P0551)
OK
MUT-II Data list
D
No. 45: Idle speed control servo position (Refer to P.13A-105.)
NG
Check the Idle speed control servo (stepper motor) system. (Refer
to P.13A-49 PROCEDURE FOR DIAGNOSIS CODE P0505)
NO
MUT-II Data list
D
No. 12: Air flow sensor
D
No. 13: Intake air temperature sensor
D
No. 14: Throttle position sensor
D
No. 21: Engine 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 showingabnormal
service data. (Refer to P.13A-12.)
NO
MUT-II Self-Diag code
D
Is a diagnosis code output?
YES
INSPECTION CHART FOR DIAGNOSIS CODE
(Refer to P.13A-12.)
Has the battery terminal been disconnected recently?
YES
After warming up the engine, idle for approximately 10 minutes.
MPI -
Troubleshooting
13A-64
OK
To the next page
OK
Measure at the C-39 engine-ECU connector.
D
Measure the engine-ECU terminal voltage.
D
Engine: Idling
D
A/C switch: ON (A/C compressor driven state)
D
Voltage between terminal No .24 and earth
(A/C setting temperature: Minimum temperature)
(Air volume: Maximum)
OK: 1 V or less
(A/C setting temperature: indoor temperature)
(Air volume: Minimum)
OK: System voltage
NG
Check the Inspection Procedure 28: A/C load signal system.
(Refer to P.13A-95.)
NG
Replace the alternator.
OK
Check the trouble symptoms.
OK
Intermittent malfunction
(Refer to GROUP 00 - Points to Note
for Intermittent Malfunctions.)
NG
OK
Check the harness between the
alternator and engine-ECU.
D
Check for disconnection,
short-circuit and damage of the
output cable.
Repair
OK
Measure at the C-40 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: Voltagerises0.2to3.5Vwhen
headlamp is turned OFF and
ON.
D
Voltage between terminal No. 41
and earth
OK: Voltagedropswhenheadlamp
is turned OFF and ON.
NG
Check the following connectors:
C-40, B-21, B-03
NG
Repair
OK
Check the harness between the
engine-ECU and earth joint.
D
Check for disconnection and
damage of the earth cable.
(2) NG
Check the following connector:
C-39
NG
Repair
NG
Replace the engine-ECU.
OK
Check the trouble symptoms.
OK
Intermittent malfunction
(Refer to GROUP 00 - Points to Note
for Intermittent Malfunctions.)
NG
OK
Check the harness between the
engine-ECU and battery.
D
Check for disconnection,
short-circuit and damage of the
power cable.
Repair
OK
Measure at the C-115 and C-126
engine-ECU connectors.
D
Measure the engine-ECU terminal
voltage.
(1) Voltage between terminal No. 80
and earth
OK: System voltage
(2) Voltage between terminal No. 13
and earth
Voltage between terminal No. 26
and earth
(Ignition switch: ON)
OK: 0.5 V or less
(1) NG
Check the following connectors:
C-115, C-129, C-05, C-135
NG
Repair
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.)
From the previous page
MPI -
Troubleshooting
13A-65
NG
Check for the entry of foreign matter (water, kerosene, etc.) in fuel.
Check the trouble symptoms.
OK
End
NG
Replace the engine-ECU.
Check the trouble symptoms.
OK
End
OK
Replace the injector for each cylinder.
OK
Check the harness and connector between each cylinder’s injector
and engine-ECU for disconnection, short-circuit or damage.
NG
Repair
OK
Check the fuel pressure. (Refer to P.13A-118.)
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.
OK
Check the compression pressure.
(Refer to GROUP 11 - Engine Adjustment.)
NG
Repair
OK
Check the harness and connector between each cylinder’s ignition
coil and body earth and between engine-ECU and ignition coil for
disconnection, short-circuit or damage.
NG
Repair
OK
Check the ignition coil parts.
(Refer to GROUP 16 - Ignition Device.)
NG
Replace the ignition coil.
OK
Check the following connectors: B-114, B-119
NG
Repair
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.
From the previous page
MPI -
Troubleshooting
13A-66
Inspection Procedure 9
Engine stalls when starting travel. (Pass out)
Probable cause
Causes shown on right are suspected.
D
Ignition system malfunction
D
Intake system malfunction
D
Exhaust gas purifier system malfunction
D
Throttle body malfunction
D
Engine-ECU malfunction
NG
Replace the engine-ECU.
OK
Check the trouble symptoms.
OK
End
OK
Check the throttle body (throttle valve section) for contamination.
NG
Clean the throttle body (throttle valve section).
(Refer to P.13A-126.)
OK
Check the air intake from the intake hose and intake manifold.
NG
Repair
OK
Check the harness and connector between each cylinder’s ignition
coil and body earth and between engine-ECU and ignition coil for
disconnection, short-circuit or damage.
NG
Repair
OK
Check the ignition coil parts.
(Refer to GROUP 16 - Ignition Device.)
NG
Replace the ignition coil.
OK
Check the following connectors: B-114, B-119
NG
Repair
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 EGR valve for sticking.
(Refer to GROUP 17 - Exhaust Gas Purifier Check.)
NG
Replace the EGR valve.
NO
Check the EGR control solenoid valve.
(Refer to GROUP 17 - Exhaust Gas Purifier Check.)
NG
Replace the EGR control solenoid valve.
NO
MUT-II Self-Diag code
D
Is a diagnosis code output?
YES
INSPECTION CHART FOR DIAGNOSIS CODE
(Refer to P.13A-12.)
Has the battery terminal been disconnected recently?
YES
After warming up the engine, idle for approximately 10 minutes.
Нет комментариевНе стесняйтесь поделиться с нами вашим ценным мнением.
Текст