Mitsubishi Lancer Evolution VI. Manual - part 41

MPI  – 

Troubleshooting

13-52

INSPECTION PROCEDURE 44

MUT-

II

: Check if surge occurs.

MUT-

II

 Data list

26 Idle position switch (Refer to P.13-58.)

NG

Check the idle position switch system.
(Refer to P.13-38, INSPECTION PROCEDURE 26.)

OK

MUT-

II

 Data list

13 Intake air temperature sensor (Refer to P.13-56.)

NG

Check the intake air temperature sensor system. (Refer to P.13-9,
INSPECTION PROCEDURE FOR DIAGNOSIS CODE 13.)

OK

MUT-

II

 Data list

25 Barometric pressure sensor (Refer to P.13-58.)

NG

Check the barometric pressure sensor system. (Refer to P.13-14,
INSPECTION PROCEDURE FOR DIAGNOSIS CODE 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.)

OK

MUT-

II

 Data list

14 Throttle position sensor (Refer to P.13-57.)

NG

Check the throttle position sensor system. (Refer to P.13-9, IN-
SPECTION PROCEDURE FOR DIAGNOSIS CODE 14.)

OK

MUT-

II

 Data list

11 Oxygen sensor

OK: 600– 1,000 mV during sudden racing

NG

Check the oxygen sensor system. 
(Refer to P.13-42, INSPECTION PROCEDURE 31.)

OK

MUT-

II

 Data list

11 Oxygen sensor

OK: Changes between 0 – 400 mV and 600 – 1,000 mV during

idling

NG

Check the fuel pressure. (Refer to P.13-30.)*

1. Inspect the intake of air into the air intake system

D

Broken intake manifold gasket

D

Broken vacuum hose

D

PCV valve does not operate.

D

Broken air intake hose

2. Check the injector for clog.

OK

NOTE
*:

Refer to Workshop Manual for LANCER EVOLUTION-IV and EVOLUTION-V (Pub. No. S9806CNCP9).

MPI  – 

Troubleshooting

13-53

INSPECTION PROCEDURE 45

Check the engine-ECU power supply and earth circuit.

Measure at the engine-ECU connectors, B-59, B-60, B-62.

D

Disconnect the connector and measure at the harness side

1. Voltage between 82 and earth (Ignition switch: ON)

OK: System voltage

2. Voltage between 38 and earth

OK: System voltage

3. Voltage between 12, 25 and earth (Ignition switch: ON)

OK: System voltage (when the terminal 38 is earthed)

4. Continuity between 13, 26 and earth

OK: Continuity

5. Voltage between 80 and earth

OK: System voltage

1. NG

Check the following
connectors: B-65, B-76

NG

Repair

OK

Check trouble symptom.

NG

Check the harness wire
between engine-ECU and
ignition switch connector.

NG

Repair

OK

Check the ignition switch. (Refer to GROUP 54.)

2, 3. NG

4. NG

Check the harness wire between engine-ECU and earth, and repair
if necessary.

5. NG

OK

Check the following
connectors:
B-59, B-60, B-62

NG

Repair

OK

Check trouble symptom.

NG

Replace the engine-ECU.

Check the following connectors:
B-65, B-49, B-75, B-73

NG

Repair

OK

Check trouble symptom.

NG

Check the harness wire between engine-ECU and battery, and
repair if necessary.

Check the harness wire between engine-ECU and control relay
connector, and repair if necessary.

INSPECTION PROCEDURE 46 <EVOLUTION-IV, EVOLUTION-V>

Check fuel pump circuit.

Measure at the fuel pump connector D-18.

D

Disconnect the connector and measure at the harness side.

D

Continuity between 1 and earth
OK: Continuity

NG

Check the following connector:
D-04

NG

Repair

OK

Check trouble symptom.

NG

Check the harness wire between fuel pump and earth, and repair
if necessary.

OK

Check the following connectors: D-04, B-64

NG

Repair

OK

Check trouble symptom.

NG

Check the harness wire between terminal for fuel pump drive and
fuel pump connector.

NG

Repair

OK

Replace the fuel pump.

MPI  – 

Troubleshooting

13-54

INSPECTION PROCEDURE 46 <EVOLUTION-VI>

Check fuel pump circuit.

Measure at the fuel pump relay connector D-18.

D

Disconnect the connector and measure at the harness side.

D

Continuity between 1 and earth
OK: Continuity

NG

Check the following connector:
D-04

NG

Repair

OK

Check trouble symptom.

NG

Check the harness wire between fuel pump and earth, and repair
if necessary.

OK

Check the following connectors: A-123, B-64, D-18, D-32

NG

Repair

OK

Check trouble symptom.

NG

Check the harness wire between fuel pump and fuel pump relay
No.2 connector.

NG

Repair

OK

Replace the fuel pump.

INSPECTION PROCEDURE 47

Check the fuel pump drive control circuit.

NG

Check the harness wire between the fuel pump relay and engine-
ECU connector.

OK

Check trouble symptom.

OK

Check trouble symptom.

NG

Check the harness wire
between fuel pump relay
and ignition switch con-
nector.

NG

Repair

OK

Check the ignition switch. (Refer to GROUP 54.)

OK

Check trouble symptom.

NG

Replace the engine-ECU.

NG

Repair

OK

Check the following connector: B-59

OK

Measure at the engine-ECU connector B-59.

D

Disconnect the connector and measure at the harness side.

D

Voltage between 8 and earth (Ignition switch: ON)
OK: System voltage

NG

Measure at the fuel pump relay connector B-28.

D

Disconnect the connector and measure at the harness side.

D

Voltage between 3, 4 and earth (Ignition switch: ON)
OK: System voltage

NG

Check the following
connectors: B-65, B-76

NG

Repair

Check the following
connector: B-28

NG

Repair

MPI  – 

Troubleshooting

MPI  – 

Troubleshooting

13-55

INSPECTION PROCEDURE 48

Check air flow sensor control circuit.

2, 3. NG

Check the following
connector: B-62

NG

Repair

OK

Check trouble symptom.

NG

Check the harness wire
between the engine-ECU
and air flow sensor con-
nector.

NG

Repair

OK

Replace the engine-ECU.

OK

Check trouble symptom.

NG

Replace the air flow sensor.

NG

Repair

OK

Check the following connector: A-25

Measure at the air flow sensor connector A-25.

D

Disconnect the connector and measure at the harness side.

1. Voltage between 4 and earth (Ignition switch: ON)

OK: System voltage

2. Voltage between 3 and earth (Ignition switch: ON)

OK: 4.8– 5.2 V

3. Continuity between 5 and earth

OK: Continuity

1. NG

Check the harness wire between the air flow sensor and control
relay connector, and repair if necessary.

INSPECTION PROCEDURE 49

Check throttle position sensor output circuit.

Measure at the engine-ECU connector B-62.

D

Connect the connector.

D

Voltage between 84 and earth (Ignition switch: ON)
OK: 0.3– 1.0 V (Throttle valve at idle position)

4.5– 5.5 V (Throttle valve fully open)

NG

Check the following
connector: B-62

NG

Repair

OK

Check trouble symptom.

NG

Replace the engine-ECU.

OK

Check the harness wire between engine-ECU and throttle position
sensor connector, and repair if necessary.

INSPECTION PROCEDURE 50

Check injector control circuit.

Measure at the engine-ECU connector B-59.

D

Disconnect the connector and measure at the harness side.

D

Voltage between 1, 2, 14, 15 and earth (Ignition switch: ON)
OK: System voltage

NG

Check the following
connectors:
A-53, A-54, A-55, A-56

NG

Repair

OK

Check trouble symptom.

NG

Check the harness between engine-ECU and injector connector,
and repair if necessary.

OK

Check the following connector: B-59

OK

Check trouble symptom.

NG

Replace the engine-ECU.

NG

Repair