Mitsubishi Lancer Evolution 7. Manual — part 182
MPI -
Troubleshooting
13A-27
Code No. P0136 Oxygen sensor (rear) system
Probable cause
Inspection Range
D
More than 3 minutes passed after completion of start of engine
D
The engine coolant temperature is approximately more than 80_C.
D
The engine speed is more than 1,200 r/min.
D
The volumetric efficiency is 25% or more.
Evaluation Conditions
D
When 5 V is applied to the oxygen sensor (rear), the output voltage is more
than 4.5 V.
D
Oxygen sensor (rear) malfunction
D
Oxygen sensor (rear) circuit disconnection,
short-circuit, or connector contact defect.
D
Engine-ECU malfunction
OK
To the next page
OK
Check the harness between the
oxygen sensor (rear) and engine-ECU.
D
Check for damage of the output
wire.
NG
Repair
NG
OK
Check the following connector:
C-115
Repair
(2) NG
Check the oxygen sensor (rear).
(Refer to P.13A-135.)
NG
Replace the oxygen sensor (rear).
OK
Check the harness between the
oxygen sensor (rear) and engine-ECU.
D
Check for damage of the earth
wire.
NG
Repair
OK
Measure at the D-22 oxygen sensor
(rear) connector.
D
Using the test harness
(MB998464), connect the
connector, and measure at the
pickup harness.
D
Engine: After warm-up
(1) Voltage between terminal No. 2
and earth
OK: Less than 0.5 V
(2) Voltage between terminal No. 1
and the earth
D
During rapid racing
OK: 0 and 600 - 1,000 mV
alternate.
(1) NG
Check the following connector:
C-115
NG
Repair
OK
Intermittent malfunction
(Refer to GROUP 00 - Points to Note
for Intermittent Malfunctions.)
OK
MUT-II Data list
D
No. 59 Oxygen sensor (rear)
(Refer to P.13A-105.)
NG
Replace engine-ECU.
OK
Check the harness between the
oxygen sensor (rear) and engine-ECU.
D
Check for disconnection and
damage of the earth wire.
NG
Repair
OK
Measure at the D-22 oxygen sensor
(rear) connector.
D
Disconnect connector to measure
at the harness side
D
Resistance between terminal No.
2 and earth.
OK: Less than 2 Ω
NG
Check the following connector:
C-115
NG
Repair
NG
Check the following connector:
D-22
NG
Repair
MUT-II Data list
D
No. 59 Oxygen sensor (rear)
(Refer to P.13A-105.)
OK
Intermittent malfunction
(Refer to GROUP 00 - Points to Note
for Intermittent Malfunctions.)
MPI -
Troubleshooting
13A-28
OK
Intermittent malfunction
(Refer to GROUP 00 - Points to Note
for Intermittent Malfunctions.)
OK
MUT-II Data list
D
No. 59 Oxygen sensor (rear)
(Refer to P.13A-105.)
NG
Replace the engine-ECU.
OK
Check the following connector:
C-115
NG
Repair
OK
Check and repair the harness between
the oxygen sensor (rear) and
engine-ECU.
D
Check for disconnection of the
output wire.
OK
Test at the C-115 engine-ECU
connector.
D
Measure the engine-ECU terminal
voltage.
D
Engine: After warm-up
D
Voltage between terminal No. 75
and earth.
D
During rapid racing
OK: 0 and 600 - 1,000 mV
alternate.
NG
Check the following connector:
C-115
NG
Repair
From the previous page
MPI -
Troubleshooting
13A-29
Code No. P0141 Oxygen sensor heater (rear) system
Probable cause
Inspection Range
D
The engine coolant water temperature is approximately more than 20_C.
D
The oxygen sensor heater (rear) 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 (rear) current is less than 0.2 A or more than 3.5
A for 4 seconds.
D
Oxygen sensor heater (rear) malfunction
D
Oxygen sensor heater (rear) circuit disconnection,
short-circuit, or connector contact defect
D
Engine-ECU malfunction
OK
Intermittent malfunction
(Refer to GROUP 00 - Points to Note
for Intermittent Malfunctions.)
OK
Check the trouble symptom.
NG
Replace the engine-ECU.
OK
Check the harness between the
oxygen sensor (rear) and engine-ECU.
D
Check for damage of the earth
wire.
NG
Repair
OK
Check the harness between the
oxygen sensor (rear) and engine
control relay.
D
Check for damage of the power
cable.
NG
Repair
OK
Check the following connector:
B-11X, C-108
NG
Repair
OK
Replace the engine-ECU.
NG
OK
Check the harness between the
oxygen sensor (rear) and engine-ECU.
D
Check for disconnection and
short-circuit of the earth wire.
Repair
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. 54
and earth.
OK: System voltage
NG
Check the following connector:
C-118
NG
Repair
OK
Check and repair the harness between
the oxygen sensor (rear) and engine
control relay.
D
Check the power cable for
disconnection and short-circuit.
OK
Measure at the D-22 oxygen sensor
(rear) connector.
D
Disconnect the connector, and
measure at the harness.
D
Ignition switch: ON
D
Voltage between terminal No. 3
and earth
OK: System voltage
NG
Check the following connector:
B-11X
NG
Repair
OK
Measure at the D-22 oxygen sensor
(rear) connector.
D
Disconnect the connector, and
measure at the sensor.
D
Resistance between terminal No.
3 and terminal No. 4.
OK: 11 - 18 Ω
NG
Replace the oxygen sensor (rear).
Check the following connector:
D-22
NG
Repair
MPI -
Troubleshooting
13A-30
Code No. P0201 No. 1 injector system
Probable cause
Inspection Range
D
The engine speed is 50 - 1,000 r/min.
D
The throttle position sensor output voltage is 1.15 V or less.
D
MUT-II forced drive (actuator test) is not being carried out.
Evaluation Conditions
D
Surge voltage at injector coil is not detected for 2 seconds.
D
No. 1 injector malfunction
D
No. 1 injector circuit disconnection, short-circuit, or
connector contact defect
D
Engine-ECU malfunction
OK
Intermittent malfunction
(Refer to GROUP 00 - Points to Note
for Intermittent Malfunctions.)
OK
Measure the signal waveform at the
C-126 engine-ECU connector (using
an analyzer).
D
Engine: Idling
D
Voltage between terminal No. 1 and
earth
OK: The waveform shown on
P.13A-119 (Inspection Proce-
dure Using Analyzer) should
be output.
NG
Replace the engine-ECU.
OK
Check the harness between the No. 1
injector and engine-ECU.
D
Check for disconnection,
short-circuit and damage of the
output cable.
NG
Repair
OK
Check the following connector:
C-126
NG
Repair
OK
Check the harness between the resis-
tor (for injector) and engine control
relay.
D
Check for damage of the power
cable.
NG
Repair
OK
Check the harness between the No. 1
injector and resistor (for injector).
D
Check for damage of the power
cable.
NG
Repair
OK
Check and repair the harness between
the resistor (for injector) and engine
control relay.
D
Check for disconnection and
short-circuit of the power cable.
NG
OK
Check the harness between the No. 1
injector and resistor (for injector).
D
Check for disconnection and
short-circuit of the power cable.
Repair
OK
Check the resistor. (Refer to
P.13A-138.)
OK
Measure at the B-27 No. 1 injector
connector.
D
Disconnect the connector to
measure at the harness side.
D
Ignition switch: ON
D
Voltage between terminal No. 1 and
earth
OK: System voltage
NG
Check the following connectors:
B-11X, B-138, C-108
NG
Repair
OK
Measure at the B-27 No. 1 injector
connector.
D
Disconnect the connector to
measure at the injector side.
D
Resistance between terminal No. 1
and terminal No. 2
OK: 2 - 3 Ω
NG
Replace the No. 1 injector.
NG
Check the following connector:
B-27
NG
Repair
MUT-II Actuator test
D
No. 01: No. 1 injector
OK: The idling state changes.
OK
Intermittent malfunction
(Refer to GROUP 00 - Points to Note
for Intermittent Malfunctions.)
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