Mitsubishi Lancer Evolution VI - Page 156

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).