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05--68
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DIAGNOSTICS
ECD SYSTEM (1ND--TV)
COROLLA Supplement (RM1129E)
DTC
P0115
ENGINE COOLANT TEMPERATURE CIRCUIT
DTC
P0116
ENGINE COOLANT TEMPERATURE CIRCUIT
RANGE/PERFORMANCE PROBLEM
CIRCUIT DESCRIPTION
A thermistor is built into the engine coolant temperature sensor and changes its resistance value according
to the engine coolant temperature.
The structure of the sensor and connection to the ECM is the same as those of the intake air temperature
sensor.
HINT:
S
When the engine coolant temperature sensor output is outside the normal range, the ECM determines
this as a malfunction.
S
If DTC P0115 or P0116 is detected, the ECM performs engine control using an estimated engine cool-
ant temperature calculated from the intake air temperature and the intake air volume at the time of en-
gine start.
DTC No.
DTC Detection Condition
Trouble Areas
P0115
Condition (a) or (b) continues for 2 seconds or more:
(a) ECT sensor output is less than --40
˚
C (--36
˚
F
)
(The MIL is illuminated as well as a DTC being set immediately
malfunction is detected)
(b) ECT sensor output is more than 140
˚
C (280
˚
F
)
(The MIL is illuminated as well as a DTC being set immediately
malfunction is detected)
S
Open or short in engine coolant temperature sensor circuit
S
Engine coolant temperature sensor
S
ECM
P0116
S
When engine coolant temperature is less than 35
˚
C (95
˚
F
) at
engine start, engine coolant temperature change for 240 se-
conds is less than 1
˚
C (34
˚
F
) on while engine coolant tem-
perature sensor vehicle is highly loaded
(The MIL is illuminated and a DTC is set when the same mal-
function is detected on 2 consecutive trips*
*: One trip is counted when the ignition switch is turned from
OFF to ON and back to OFF)
S
When engine coolant temperature is more than 98
˚
C (208
˚
F
)
at engine start, engine coolant temperature sensor shows a
change of less than 3
˚
C (37
˚
F
) for 240 seconds while vehicle
carries light load that is equal to that when the engine is idling
(The MIL is illuminated and a DTC is set when the same mal-
function is detected on 6 consecutive trips*
*: One trip is counted when the ignition switch is turned from
OFF to ON and back to OFF)
S
Engine coolant temperature sensor
S
ECM
HINT:
S
DTC P0115 is set when the engine idles for approximately 15 seconds.
S
DTC P0116 is set when the vehicle idles for more than 5 minutes after driving at a vehicle speed of
100 to 120 km/h for more than 5 minutes.
S
When DTC P0115 or P0116 is detected, check the engine coolant temperature by selecting Powertrain
/ Engine and ECT / Data List / Coolant Temp on the intelligent tester ll.
Temperature Displayed
Malfunction
Less than --40
˚
C (--40
˚
F)
Open or short to +B circuit
More than 140
˚
C
(284
˚
F)
Short circuit
05CPM--14
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TOYOTA COROLLA REPAIR MANUAL SUPP 1129E