Mitsubishi Lancer Evolution VI. Manual — part 39
MPI –
Troubleshooting
13-44
INSPECTION PROCEDURE 32
Ignition circuit system
Probable cause
The engine-ECU interrupts the ignition coil primary current by turning the power transistor
inside the engine-ECU ON and OFF.
D
Malfunction of ignition switch.
D
Improper connector contact, open or short-circuited
harness wire
D
Malfunction of the engine-ECU
Measure at the ignition coil connectors A-110, A-111.
D
Disconnect the connector and measure at the harness side.
1. Voltage between 1 and earth (Ignition switch: ON)
OK: System voltage
2. Continuity between 2 and earth
OK: Continuity
1. NG
Check the following
connectors: B-65, B-76
NG
Repair
OK
Check trouble symptom.
NG
Check the harness wire
between ignition coil and
ignition switch connector.
NG
Repair
OK
Check the ignition switch.
2. NG
Check the harness wire between ignition coil connector and earth,
and repair if necessary.
OK
Check the following
connectors:
A-110, A-111
NG
Repair
OK
Check trouble symptom.
NG
Check ignition coil and power transistor unit system. (Refer to
P.13-16, INSPECTION PROCEDURE FOR DIAGNOSIS CODE
44.)
INSPECTION PROCEDURE 33
Idle speed control (ISC) servo (Stepper motor) system
Probable cause
The engine-ECU controls the intake air volume during idling by opening and closing
the servo valve located in the bypass air passage.
D
Malfunction of ISC servo
D
Improper connector contact, open or short-circuited
harness wire
D
Malfunction of the engine-ECU
Check the ISC servo.
NG
Replace
OK
Measure at the ISC servo connector A-18.
D
Disconnect the connector and measure at the harness side.
D
Voltage between 2 and earth, and 5 and earth (Ignition switch:
ON)
OK: System voltage
NG
Check the harness wire between control relay and ISC servo con-
nector, and repair if necessary.
OK
Measure at the engine-ECU connector B-59.
D
Disconnect the connector, measure at the harness side.
D
Voltage between each of 4, 5, 17, 18 and earth (Ignition switch:
ON)
OK: System voltage
NG
Check the following
connector: A-18
NG
Repair
OK
Check trouble symptom.
NG
Check harness wire between engine-ECU and ISC servo connector,
and repair if necessary.
OK
Check the following
connector: B-59
NG
Repair
OK
Check trouble symptom.
NG
Replace the engine-ECU.
MPI –
Troubleshooting
13-45
INSPECTION PROCEDURE 34
Fuel pressure control valve system
Probable cause
The fuel pressure control valve switches the pressure introduction into the fuel pressure
regulator between the intake manifold and atmosphere.
D
Malfunction of solenoid valve
D
Improper connector contact, open or short-circuited
harness wire
D
Malfunction of engine-ECU
NG
Replace the engine-ECU.
OK
Check trouble symptom.
NG
Check the harness wire between engine-ECU and solenoid valve
connector, and repair if necessary.
OK
Check trouble symptom.
OK
Check the following connector: B-59
NG
Repair
OK
Measure at the engine-ECU connector B-59.
D
Disconnect the connector, and measure at the harness side.
D
Voltage between 3 and earth
(Ignition switch: ON)
OK: System voltage
NG
Check the following connector: A-12
NG
Repair
NG
Check the harness wire between control relay and solenoid valve
connector, and repair if necessary.
OK
Measure at the fuel pressure control valve connector A-12.
D
Disconnect the connector, and measure at the harness side.
D
Voltage between 1 and earth
(Ignition switch: ON)
OK: System voltage
Check the fuel pressure control valve.
NG
Replace
INSPECTION PROCEDURE 35
Waste gate solenoid valve
Probable cause
The waste gate solenoid valve controls the boost pressure introduced into the waste
gate actuator in the turbocharger.
D
Malfunction of solenoid valve
D
Improper connector contact, open or short-circuited
harness wire
D
Malfunction of engine-ECU
NG
Replace the engine-ECU.
OK
Check trouble symptom.
NG
Check the harness wire between engine-ECU and solenoid valve
connector, and repair if necessary.
OK
Check trouble symptom.
OK
Check the following connector: B-59
NG
Repair
OK
Measure at the engine-ECU connector B-59.
D
Disconnect the connector, and measure at the harness side.
D
Voltage between 11 and earth
(Ignition switch: ON)
OK: System voltage
NG
Check the following connector: A-23
NG
Repair
NG
Check the harness wire between control relay and solenoid valve
connector, and repair if necessary.
OK
Measure at the waste gate solenoid valve connector A-23.
D
Disconnect the connector, and measure at the harness side.
D
Voltage between 2 and earth
(Ignition switch: ON)
OK: System voltage
Check the waste gate solenoid valve.
(Refer to Group 15 – On-vehicle service.)*
NG
Replace
NOTE
*:
Refer to Workshop Manual for LANCER EVOLUTION-IV and EVOLUTION-V (Pub. No. S9806CNCP9).
MPI –
Troubleshooting
13-46
INSPECTION PROCEDURE 36
Secondary air control solenoid valve system
Probable cause
The secondary air control solenoid valve switches the pressure introduction into the
secondary air valve between the intake manifold and atmosphere.
D
Malfunction of solenoid valve
D
Improper connector contact, open or short-circuited
harness wire
D
Malfunction of engine-ECU
NG
Replace the engine-ECU.
OK
Check trouble symptom.
NG
Check the harness wire between engine-ECU and solenoid valve
connector, and repair if necessary.
OK
Check trouble symptom.
NG
Check the harness wire between control relay and solenoid valve
connector, and repair if necessary.
OK
Check trouble symptom.
OK
Check the following connector: B-59
NG
Repair
OK
Measure at the engine-ECU connector B-59.
D
Disconnect the connector, and measure at the harness side.
D
Voltage between 6 and earth
(Ignition switch: ON)
OK: System voltage
NG
Check the following connectors:
A-127, A-88
NG
Repair
OK
Measure at the secondary air control solenoid connector A-127.
D
Disconnect the connector, and measure at the harness side.
D
Voltage between 1 and earth
(Ignition switch: ON)
OK: System voltage
NG
Check the following connector: A-88
NG
Repair
Check the secondary air control solenoid valve.
(Refer to Group 15 – INTAKE AND EXHAUST.)*
NG
Replace
NOTE
*:
Refer to Workshop Manual for LANCER EVOLUTION-IV and EVOLUTION-V (Pub. No. S9806CNCP9).
MPI –
Troubleshooting
13-47
INSPECTION PROCEDURE 37
MUT-
II
: Inspection of no initial combustion
MUT-
II
Data list
16 engine-ECU power supply voltage (Refer to P.13-57.)
NG
Check the power supply and ignition switch-IG system.
(Refer to P.13-35, INSPECTION PROCEDURE 24.)
OK
Does the camshaft rotate at the engine cranking?
(When oil filler cap is removed.)
No
Check timing belt for breakage.
Yes
MUT-
II
Self-Diag code
Are diagnosis codes displayed?
Yes
Refer to P.13-8, INSPECTION CHART FOR DIAGNOSIS CODES.
No
MUT-
II
Data list
22 Crank angle sensor
OK: Cranking speed is displayed.
NG
Check the crank angle sensor system.
(Refer to P.13-11, INSPECTION PROCEDURE FOR DIAGNOSIS
CODE 22.)
OK
MUT-
II
Actuator test
07 Fuel pump (Refer to P.13-61.)
NG
Check the fuel pump system.
(Refer to P.13-36, INSPECTION PROCEDURE 25.)
OK
MUT-
II
Data list
21 Engine coolant temperature sensor (Refer to P.13-57.)
NG
Check the engine coolant temperature sensor system.
(Refer to P.13-10, INSPECTION PROCEDURE FOR DIAGNOSIS
CODE 21.)
INSPECTION PROCEDURE 38
Ignition system: Inspection of no initial combustion.
OK
Check the ignition timing when cranking.
OK: Approx. 5
_
BTDC
NG
Check that the crank angle sensor and the timing belt cover are
installed properly.
NG
Check the ignition circuit system.
(Refer to P.13-44, INSPECTION PROCEDURE 32.)
Check by connecting a timing light to the spark plug cable.
OK: Timing light flashes during cranking.
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