Mitsubishi Electric Lancer Evolution-VII Workshop Manual page 1163

13A-26
Code No. P0135 Oxygen sensor heater (front) system
Inspection Range
D The engine coolant temperature is approximately more than 20_C.
D The oxygen sensor heater (front) is ON.
D The engine speed is more than 50 r/min.
D A/C relay: OFF, radiator fan: OFF
D The battery voltage is 11 - 16 V.
Evaluation Conditions
D The oxygen sensor heater (front) current is less than 0.2 A or more than 3.5
A for 4 seconds.
Check the following connector:
B-34
OK
Measure at the B-34 oxygen sensor
(front) connector.
D Disconnect the connector, and
measure at the sensor.
D Resistance between terminal No.
1 and terminal No. 3.
OK: 4.5 - 8.0 Ω
OK
Measure at the B-34 oxygen sensor
(front) connector.
D Disconnect the connector, and
measure at the harness.
D Ignition switch: ON
D Voltage between terminal No. 1
and earth
OK: System voltage
OK
Measure at the C-118 engine-ECU
connector.
D Measure the engine-ECU terminal
voltage.
D Ignition switch: ON
D Voltage between terminal No. 60
and earth.
OK: System voltage
OK
Check the following connector:
C-118
OK
Check the harness between the
oxygen sensor (front) and engine
control relay.
D Check for damage of the power
cable.
OK
Check the harness between the
oxygen sensor (front) and
engine-ECU.
D Check for damage of the earth
wire.
OK
Check the trouble symptom.
OK
Intermittent malfunction
(Refer to GROUP 00 - Points to Note
for Intermittent Malfunctions.)
MPI -
Troubleshooting
NG
Repair
NG
Replace the oxygen sensor (front).
NG
Check the following connector:
B-11X
Check and repair the harness between
the oxygen sensor (front) and engine
control relay.
D Check the power cable for
disconnection and short-circuit.
NG
Check the following connector:
C-118
Check the harness between the
oxygen sensor (front) and
engine-ECU.
D Check for disconnection and
short-circuit of the earth wire.
Replace the engine-ECU.
NG
Repair
NG
Repair
NG
repair
NG
Replace the engine-ECU.
Probable cause
D Oxygen sensor heater (front) malfunction
D Oxygen sensor heater (front) circuit disconnection,
short-circuit, or connector contact defect
D Engine-ECU malfunction
NG
OK
NG
OK
NG
OK
Repair
Repair
Repair