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
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