ENGINE (J05E)/TROUBLESHOOTING
2–235
DTC: P0115
EN01H02127030602016044
P0115: Malfunction of coolant temperature sensor and intake air temperature sensor
INFORMATION
1.
Technical description
•
Two engine coolant temperature sensors are installed in thermostat case and constantly measure the engine cool-
ant temperature.
•
Although some exhaust gas components operate after the engine coolant temperature has risen to some degree
(engine warm up), when an engine coolant temperature sensor reads a value lower than the actual temperature, it
means it is not working properly. Diagnosis is therefore required to detect if there is something wrong with the char-
acteristics of the engine coolant temperature sensor.
<Description of malfunction>
•
Failure of both engine coolant temperature sensors is detected.
2.
DTC set condition
(1)
DTC detection condition
•
Engine speed is at least 500 r/min or engine is stopped.
•
Battery voltage is in the range of 10 V to 16 V.
(2)
Judgement criteria
•
When it is deemed that both engine coolant temperature sensors are malfunctioning.
3.
Reset condition
•
Problem does not recur in the same driving cycle.
•
Normal operation is restored after set the starter key to the "LOCK" position when in subsequent driving cycles,
readings are in the normal range within the above detection conditions.
•
Three driving cycles must be deemed normal for MIL to be OFF.
4.
Indication, warning or system control regulation when the DTC is set.
•
MIL: ON
•
SVS light: OFF
(E)
(THW)
Z5G
X66
ZJQ (E5)
X28 (THW)
10mA
10mA
Engine ECU
Coolant temperature
sensor
Body earth
(E22)
(THW2)
ZKP
XS1
ZD6 (E3)
XDN (THWO)
X3Q (SL)
10mA
10mA
Body earth
Coolant temperature
sensor 2
SHTS021270300214
