−
DIAGNOSTICS
ENGINE (1ZZ
−
FE)
DI
−
87
2005 CELICA (RM1131U)
DTC
P0115
Engine Coolant Temperature Circuit
CIRCUIT DESCRIPTION
A thermistor is built into the Engine Coolant Temperature (ECT) sensor and changes the resistance value
according to the engine coolant temperature.
The structure of the sensor and connection to the ECM are the same as the Intake Air Temperature (IAT)
sensor.
HINT:
If the ECM detects DTC P0115, it operates fail safe function in which the engine coolant temperature is as-
sumed to be 80
°
C (176
°F).
DTC No.
Detection Item
Trouble Area
P0115
Open or short in engine coolant temperature sensor circuit
S
Open or short in engine coolant temperature sensor circuit
S
Engine coolant temperature sensor
S
ECM
HINT:
After confirming DTC ”P0115”, use the OBD II scan tool or the hand
−
held tester to confirm the engine coolant
temperature from the DIAGNOSIS / ENHANCED OBD II / DATA LIST / ALL.
Temp. Displayed
Malfunction
−
40
°
C (
−
40
°
F)
Open circuit
140
°C
(284
°F) or more
Short circuit
MONITOR DESCRIPTION
The ECT (Engine Coolant Temperature) sensor is used to monitor the engine coolant temperature. The ECT
sensor has a thermistor that varies its resistance depending on the temperature of the engine coolant. When
the coolant temperature is low, the resistance in the thermistor increases. When the temperature is high, the
resistance drops. The variations in resistance are reflected in the voltage output from the sensor.
The ECM monitors the sensor voltage and uses this value to calculate the engine coolant temperature.
When the sensor output voltage deviates from the normal operating range, the ECM interprets this as a fault
in the ECT sensor and sets a DTC.
Example:
When the ECM calculates that the ECT is less than
−
40
_
C (
−
40
_
F), or more than 140
_
C (284
_
F), and if either
condition continues for 0.5. sec. or more, the ECM will set a DTC.
MONITOR STRATEGY
Related DTCs
P0115
Engine coolant temperature sensor range check
(Fluttering)
Engine coolant temperature sensor range check
(Low voltage)
Engine coolant temperature sensor range check
(High voltage)
Required sensors/components
Engine coolant temperature sensor
Frequency of operation
Continuous
Duration
0.5 sec.
MIL operation
Immediate
Sequence of operation
None
DI380
−
17
285
Содержание Celica 2005
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