Mitsubishi Lancer Evolution 7. Manual — part 192
MPI -
Troubleshooting
13A-67
Inspection Procedure 10
Engine stalls during deceleration
Probable cause
Causes shown on right are suspected.
D
Idle speed control system malfunction
D
Exhaust gas purifier system malfunction
D
Throttle valve malfunction
D
Engine-ECU malfunction
NG
Replace the engine-ECU.
OK
Check the trouble symptoms.
OK
End
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.
NO
Check the throttle body (throttle valve section) for contamination.
NG
Clean the throttle body (throttle valve section).
(Refer to P.13A-126.)
OK
MUT-II Data list
D
No. 45: Idle speed control (servo) position
D
Does the idle speed control (servo) position drop to 0 to 2
steps during deceleration (engine rotation speed 1000 r/min or
more)?
YES
Check the Code No. P0500: Vehicle speed sensor system.
(Refer to P.13A-43.)
NO
MUT-II Data list
D
No. 14: Throttle position sensor (Refer to P.13A-103.)
NG
Check the Code No. P0120: Throttle position sensor system.
(Refer to P.13A-21.)
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-68
Inspection Procedure 11
Pulsation (Hesitation, sag), poor acceleration, stumbling,
surging
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
Turbocharger system malfunction
OK
To the next page
OK
MUT-II Data list
D
No. 59: Oxygen sensor (rear) (Refer to P.13A-105.)
<Europe and General Export-spec. models>
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 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
MUT-II Data list
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 showing
abnormal service data. (Refer to P.13A-12.)
OK
Check the injector operation sound. (Use sound scope.)
NG
Check the Code No. P0201 - 204: Injector system for faulty
cylinder.
NO
Check the ignition timing.
(Refer to GROUP 11 - Engine Adjustment.)
NG
Check mounting state of crank angle sensor and timing belt cover.
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-69
NG
Check and repair the intake hose and manifold damage and air
intake.
OK
Check the trouble symptoms.
OK
End
NG
Check the compression pressure.
(Refer to GROUP 11 - Engine Adjustment.)
NG
Repair
OK
Check the trouble symptoms.
OK
End
OK
Check the fuel pressure. (Refer to P.13A-128.)
NG
Repair
OK
MUT-II Actuator test
D
No. 09: Fuel pressure control solenoid valve
(Refer to P.13A-107.)
NG
Check the Fuel pressure control solenoid valve system.
(Refer to P.13A-12, INSPECTION PROCEDURE FOR
DIAGNOSIS CODE No. P1105)
OK
Check the supercharging pressure control system.
(Refer to GROUP 15 - Intake Exhaust, On-vehicle Service.)
NG
Repair
OK
Check the turbocharger supercharging pressure.
(Refer to GROUP 15 - Intake Exhaust, On-vehicle Service.)
NG
Repair
OK
MUT-II Actuator test
D
No. 12: Waste gate solenoid valve (Refer to P.13A-107.)
NG
Check the waste gate solenoid valve system.
(Refer to P.13A-12, INSPECTION PROCEDURE FOR
DIAGNOSIS CODE No. P1104)
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-123, 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-70
Inspection Procedure 12
Shock during acceleration
Probable cause
The occurrence of ignition leaks, etc., due to the rise in voltage required for the spark
plugs during acceleration is a probable cause.
D
Ignition system malfunction
OK
Check and repair the harness and connector between each
cylinder’s ignition coil and body earth and between the engine-
ECU and ignition coil for disconnection, short-circuit and damage.
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.
NO
Check the spark plug cable.
(Refer to GROUP 16 - Ignition Device.)
NG
Replace the spark plug cable.
MUT-II Self-Diag code
D
Is a diagnosis code output?
YES
INSPECTION CHART FOR DIAGNOSIS CODE
(Refer to P.13A-12.)
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