Mitsubishi Lancer Evolution VI. Manual — part 38
MPI –
Troubleshooting
13-40
INSPECTION PROCEDURE 30 <EVOLUTION-IV, EVOLUTION-V>
Fan motor relay system (Radiator fan, A/C condenser fan)
Probable cause
The engine-ECU turns on/off the built-in power transistor to control the fan motor
relay.
D
Malfunction of the fan motor relay
D
Malfunction of the fan motor
D
Improper connector contact, open or short-circuited
harness wire
D
Malfunction of engine-ECU
NG
D
Check the radiator fan circuit.
D
Check the A/C condenser fan circuit.
(Refer to Electrical Wirings.)
NG
Replace the engine-ECU.
OK
Check trouble symptom.
Measure at the engine-ECU connector B-59.
D
Disconnect the connector, and measure at the harness side.
D
Voltage between each of 20 and 21 and earth
(Ignition switch: ON)
OK: System voltage
D
Short the terminal 21 to earth.
(Ignition switch: ON)
OK: Fan operates at low speed.
D
Short the terminals 20 and 21 to earth.
(Ignition switch: ON)
OK: Fan operates at high speed.
OK
Check the following connector: B-59
NG
Repair
MPI –
Troubleshooting
13-41
INSPECTION PROCEDURE 30 <EVOLUTION-VI>
Fan motor relay system (Radiator fan, A/C condenser fan)
Probable cause
The engine-ECU turns on/off the built-in power transistor to control the fan motor
relay.
D
Malfunction of the fan motor relay
D
Malfunction of the fan motor
D
Malfunction of thermostat
D
Improper connector contact, open or short-circuited
harness wire
D
Malfunction of engine-ECU
NG
Check the engine coolant temperature sensor. (Refer to P.13-10,
INSPECTION PROCEDURE FOR DIAGNOSIS CODE 21.)
OK
Replace the engine-ECU.
NG
MUT-
II
Data list
21 Engine coolant temperature sensor
OK: The engine coolant temperature agrees with the reading
of MUT-
II
when measured with the engine idling in warm
condition.
OK
Check the thermostat.
NG
Replace
OK
Check trouble symptom.
OK
Check the following connector: B-60
NG
Repair
NG
Check the A/C condenser fan circuit. (Refer to Electrical Wirings.)
NG
Measure at the engine-ECU connector B-60.
D
Disconnect the connector, and measure at the harness side.
D
Check the A/C condenser fan for operating condition.
(Ignition switch: ON)
OK: A/C condenser fan is stationary.
D
Voltage between each of 32 and 34 and earth
(Ignition switch: ON)
OK: System voltage
D
Short the terminal 32 to earth. (Ignition switch: ON)
OK: A/C condenser fan operates at high speed.
D
Short the terminal 34 to earth. (Ignition switch: ON)
OK: A/C condenser fan operates at low speed.
Check trouble symptom.
OK
OK
Check the following connector: B-59
NG
Repair
Measure at the engine-ECU connector B-59.
D
Disconnect the connector, and measure at the harness side.
D
Check the radiator fan for operating condition.
(Ignition switch: ON)
OK: Radiator fan is stationary.
D
Voltage between each of 20 and 21 and earth
(Ignition switch: ON)
OK: System voltage
D
Short the terminal 20 to earth.
(Ignition switch: ON)
OK: Radiator fan operates at high speed.
D
Short the terminal 21 to earth.
(Ignition switch: ON)
OK: Radiator fan operates at low speed.
NG
Check the radiator fan circuit. (Refer to Electrical Wirings.)
MPI –
Troubleshooting
13-42
INSPECTION PROCEDURE 31 <EVOLUTION-IV>
Oxygen sensor system
Probable cause
When CO or HC concentration is too high, the malfunction of the parts shown at
right may be the cause.
D
The oxygen sensor detects the density of oxygen in exhaust gas and inputs it
to the engine-ECU after converting into a voltage signal.
D
The engine-ECU controls the fuel injection amount based on this signal such that
the stoichiometric air/fuel mixture ratio can be obtained.
D
Malfunction of oxygen sensor
D
Improper connector contact, open or short-circuited
harness wire
D
Malfunction of engine-ECU
OK
Replace the engine-ECU.
Check the harness wire between
engine-ECU and oxygen sensor connector.
NG
Repair
NG
OK
Check trouble symptom.
OK
Replace the engine-ECU.
NG
Check the harness wire between
engine-ECU and oxygen sensor connector.
NG
Repair
OK
Check trouble symptom.
OK
Check the following connector: A-63
NG
Repair
OK
Measure at the oxygen sensor connector A-63.
D
Disconnect the connector, and measure at the harness side.
D
Continuity between 2 and earth
OK: Continuity
NG
Check the following connector: B-62
NG
Repair
Check the oxygen sensor. (Refer to P.13-32.)*
NG
Replace
NOTE
*:
Refer to Workshop Manual for LANCER EVOLUTION-IV and EVOLUTION-V (Pub. No. S9806CNCP9).
MPI –
Troubleshooting
13-43
INSPECTION PROCEDURE 31 <EVOLUTION-V, EVOLUTION-VI>
Oxygen sensor system
Probable cause
When CO or HC concentration is too high, the malfunction of the parts shown at
right may be the cause.
D
The oxygen sensor detects the density of oxygen in exhaust gas and inputs it
to the engine-ECU after converting into a voltage signal.
D
The engine-ECU controls the fuel injection amount based on this signal such that
the stoichiometric air/fuel mixture ratio can be obtained.
D
Malfunction of oxygen sensor
D
Improper connector contact, open or short-circuited
harness wire
D
Malfunction of engine-ECU
OK
Replace the engine-ECU.
NG
Check the harness wire between oxygen sensor, engine-ECU,
and repair if necessary.
OK
Check trouble symptom.
NG
Check the harness wire between oxygen sensor and engine-ECU,
and repair if necessary.
OK
Check trouble symptom.
OK
Check trouble symptom.
NG
Check the harness wire between
engine-ECU and oxygen sensor.
NG
Repair
OK
Check the following connector: B-61
NG
Repair
OK
NG
Measure at the engine-ECU connector B-61.
D
Disconnect the connector, and measure at the harness side.
D
Voltage between 60 and earth
(Ignition switch: ON)
OK: System voltage
Check the following connector: A-63
NG
Repair
1. NG
Check the harness wire between oxygen sensor and control relay,
and repair if necessary.
OK
2. NG
Measure at the oxygen sensor connector A-63.
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
Check the following connector: B-62
NG
Repair
Check the oxygen sensor. (Refer to P.13-32)*
NG
Replace
NOTE
*:
Refer to Workshop Manual for LANCER EVOLUTION-IV and EVOLUTION-V (Pub. No. S9806CNCP9).
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