Mitsubishi Lancer Evolution 7. Manual — part 180
MPI -
Troubleshooting
13A-19
Code No. P0115 Engine coolant temperature sensor
system
Probable cause
Inspection Range
D
After setting the ignition switch to the “ON” position, or 2 seconds after
completion of engine start.
Evaluation Conditions
D
When the sensor output voltage is more than 4.6 V for 4 seconds
(Equivalent to water temperature of less than -45_C)
or
D
When the sensor output voltage is less than 0.1 V for 4 seconds (Equivalent
to water temperature of more than 140_C)
D
Engine coolant temperature sensor malfunction
D
Engine coolant temperature sensor circuit
disconnection and short-circuit or connector contact
defect
D
Engine-ECU malfunction
Inspection Range
D
Ignition switch: ON
D
The engine speed is approximately 50 r/min or more.
Evaluation Conditions
D
From less than 1.6 V (Equivalent to water temperature of more than 40_C),
the sensor output voltage rises to more than 1.6 V (Equivalent to water
temperature of less than 40_C)
D
The sensor output voltage is more than 1.6 V for 5 minutes
OK
To the next page
OK
Measure at the B-118 engine coolant
temperature sensor connector.
D
Disconnect the connector and
measure at the sensor side.
D
Resistance between terminals No.
1 and No. 2
OK: Water temperature -20_C
14 - 17 kΩ
Water temperature 0_C
5.1 - 6.5 kΩ
Water temperature 20_C
2.1 - 2.7 kΩ
Water temperature 40_C
0.9 - 1.3 kΩ
Water temperature 60_C
0.48 - 0.68 kΩ
Water temperature 80_C
0.26 - 0.36 kΩ
NG
Replace the engine coolant
temperature sensor.
NG
Check the following connector:
B-118
NG
Repair
MUT-II Data list
D
No. 21 Engine coolant
temperature sensor
OK: When cool, more or less
the same as the ambient
temperature (air tempera-
ture) When warm
80 - 120_C
OK
Intermittent malfunction
(Refer to GROUP 00 - Points to Note
for Intermittent Malfunctions.)
MPI -
Troubleshooting
13A-20
OK
To the next page
OK
Intermittent malfunction
(Refer to GROUP 00 - Points to Note
for Intermittent Malfunctions.)
OK
MUT-II Data list
D
No. 21 Engine coolant
temperature sensor
OK: When cool, more or less
the same as the ambient
temperature (air tempera-
ture) When warm
80 - 120_C
NG
Replace the engine-ECU.
OK
Check the harness between the engine
coolant temperature sensor and
engine-ECU.
D
Check for disconnection and
damage of the earth wire.
NG
Repair
Check the following connector:
C-115
NG
Repair
(2) NG
OK
Intermittent malfunction
(Refer to GROUP 00 - Points to Note
for Intermittent Malfunctions.)
OK
MUT-II Data list
D
No. 21 Engine coolant
temperature sensor
OK: When cool, more or less
the same as the ambient
temperature (air tempera-
ture) When warm,
80 - 120_C
NG
Replace the engine-ECU.
OK
Check the harness between the engine
coolant temperature sensor and
engine-ECU.
D
Check for short-circuit of the
output wire.
NG
Repair
NG
Check the following connector:
C-115
NG
Repair
OK
Check and repair the harness between
the engine coolant temperature sensor
and engine-ECU.
D
Check for disconnection of the
output wire.
NG
Repair
OK
Measure at the B-118 engine coolant
temperature sensor connector.
D
Disconnect the connector to
measure at the harness side
(1) Voltage between terminal No. 1
and the earth.
(Ignition switch: ON)
OK: 4.5 - 4.9 V
(2) Resistance between terminal No.
2 and earth
OK: Less than 2 Ω
(1) NG
Measure at the C-115 engine-ECU
connector.
D
Measure the engine-ECU terminal
voltage.
D
Disconnect the B-118 engine
coolant temperature sensor
connector.
D
Ignition switch: ON
D
Voltage between terminal 83 and
the earth.
OK: 4.5 - 4.9 V
OK
Check the following connector:
C-115
From the previous page
MPI -
Troubleshooting
13A-21
OK
Intermittent malfunction
(Refer to GROUP 00 - Points to Note
for Intermittent Malfunctions.)
OK
MUT-II Data list
D
No. 21 Engine coolant
temperature sensor
OK: When cool, more or less
the same as the ambient
temperature (air tempera-
ture) When warm,
80 - 120_C
NG
Replace the engine-ECU.
OK
Check and repair the harness between
the engine coolant temperature sensor
and engine-ECU.
D
Check for damage of the output
wire.
D
Check for damage of the earth
wire.
OK
Measure at the B-118 engine coolant
temperature sensor connector.
D
Using the test harness
(MB991658), connect the
connector, and measure at the
pickup harness.
D
Ignition switch: ON
D
Voltage between terminal No. 1
and the earth.
OK: Water temperature -20_C
3.9 - 4.5 V
Water temperature 0_C
3.2 - 3.8 V
Water temperature 20_C
2.3 - 2.9 V
Water temperature 40_C
1.3 - 1.9 V
Water temperature 60_C
0.7 - 1.3 V
Water temperature 80_C
0.3 - 0.9 V
NG
Check the following connector:
C-115
NG
Repair
From the previous page
Code No. P0120 Throttle position sensor system
Probable cause
Inspection Range
D
Ignition switch: ON
D
Excluding for two seconds after ignition switch is set to “ON” position or two
seconds after engine start is completed.
Evaluation Conditions
D
The sensor output voltage is 0.2 V or less for 2 seconds.
D
Throttle position sensor malfunction
D
Throttle position sensor circuit disconnection,
short-circuit, or connector contact defect
D
Engine-ECU malfunction
Inspection Range
D
The engine speed is 1,000 r/min or less.
D
The volumetric efficiency is 60 % or less.
Evaluation Conditions
D
The sensor output voltage is 2.0 V or less for 2 seconds.
OK
To the next page
OK
Check the throttle position sensor.
(Refer to P.13A-134.)
NG
Replace the throttle position sensor.
NG
Check the following connector:
B-02
NG
Repair
MUT-II Data list
D
No. 14 Throttle position sensor
(Refer to P.13A-103.)
OK
Intermittent malfunction
(Refer to GROUP 00 - Points to Note
for Intermittent Malfunctions.)
MPI -
Troubleshooting
13A-22
OK
To the next page
OK
Intermittent malfunction
(Refer to GROUP 00 - Points to Note
for Intermittent Malfunctions.)
OK
MUT-II Data list
D
No. 14 Throttle position sensor
(Refer to P.13A-114.)
NG
Replace the engine-ECU.
OK
Check the harness between the throttle
position sensor and engine-ECU.
D
Check for disconnection and
damage of the earth wire.
NG
Repair
Check the following connector:
C-115
NG
Repair
(2) NG
OK
Intermittent malfunction
(Refer to GROUP 00 - Points to Note
for Intermittent Malfunctions.)
OK
MUT-II Data list
D
No. 14 Throttle position sensor
(Refer to P.13A-114.)
NG
Replace the engine-ECU.
OK
Check the harness between the throttle
position sensor and engine-ECU.
D
Check for short-circuit of the
power cable.
NG
Repair
NG
Check the following connector:
C-115
NG
Repair
OK
Check and repair the harness between
the throttle position sensor and
engine-ECU.
D
Check for disconnection of the
power cable.
NG
Repair
From the previous page
OK
Measure at the B-02 throttle position
sensor connector.
D
Disconnect the connector to
measure at the harness side
(1) Voltage between terminal No. 1
and the earth.
(Ignition switch: ON)
OK: 4.9 - 5.1 V
(2) Resistance between terminal No.
4 and earth
OK: Less than 2 Ω
(1) NG
Measure at the C-115 engine-ECU
connector.
D
Measure engine-ECU terminal
voltage.
D
Ignition switch: ON
D
Voltage between terminal No. 81
and earth.
OK: 4.9 - 5.1 V
OK
Check the following connector:
C-115
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