Toyota Celica 2005, Руководство по ремонту

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DI − 94
− DIAGNOSTICS ENGINE (1ZZ − FE)
2005 CELICA (RM1131U)
DTC P0116 Engine Coolant Temperature Circuit Range/
Performance Problem
CIRCUIT DESCRIPTION
Refer to DTC P0115 on page DI−87.
DTC No. DTC Detecting Condition Trouble Area
P0116
The ECT is 35 ° C (95 ° F) or more but less than 60 ° C (140 ° F)
when the engine is started, and conditions (a) and (b) are met:
(a) Vehicle has accelerated and decelerated
(b) Engine coolant temperature remains within 3
° C (5.4 ° F) of
the initial engine coolant temperature
(2 trip detection logic)
S
ECT sensor
S
The ECT is more than 60
°
C (140
°
F) when the engine is
started and the vehicle has accelerated and decelerated
S The ECT sensor records a temperature variation is below
1
° C (1.8 ° F) successively 6 times
(6 trip detection logic)
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 sen-
sor output voltage deviates from the normal operating range, the ECM interprets this as a fault in the ECT
sensor and sets a DTC.
Examples:
(1) Upon starting the engine, the ECT is between 35
° C (95 ° F) and 60 ° C (140 ° F). If after driving for 250 sec.,
the ECT still remains within 3 ° C (5.4 ° F) of the starting temperature, a DTC will be set (2 trip detection logic).
(2) Upon starting the engine, the ECT is over 60 ° C (140 ° F). If after driving for 250 sec., the ECT still remains
within 1 ° C (1.8 ° F) of the starting temperature, a DTC will be set (6 trip detection logic).
MONITOR STRATEGY
Related DTCs P0116
Engine coolant temperature sensor range check
(Stuck)
Required sensors/components
Main sensors Engine coolant temperature sensor
Related sensors
Intake air temperature sensor, Crankshaft
position sensor, Mass air flow meter
Frequency of operation Continuous
Duration 250 sec.
MIL operation
2 driving cycles (When temperature is fixed between 35 _ C (95 _ F) and 60 _ C (140 _ F))
6 driving cycles (When temperature is fixed at 60 _ C (140 _ F) or more)
Sequence of operation None
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