Description
The engine coolant temperature sensor is used to detect the engine coolant temperature. The sensor modifies a voltage signal from the ECM. The modified signal returns to the ECM as the engine coolant temperature input. The sensor uses a thermistor which is sensitive to the change in temperature. The electrical resistance of the thermistor decreases as temperature increases.
<Reference data>
*: These data are reference values and are measured between ECM terminals 46 (Engine coolant temperature sensor) and 52 (Sensor ground).
DTC Logic
DTC DETECTION LOGIC
NOTE:
DTC CONFIRMATION PROCEDURE
1.PRECONDITIONING
If DTC Confirmation Procedure has been previously conducted, always perform the following before conducting the next test.
2.CHECK ENGINE COOLANT TEMPERATURE SENSOR FUNCTION
With CONSULT
With GST
Follow the procedure "With CONSULT" above.
3.PERFORM DTC CONFIRMATION PROCEDURE
With CONSULT
If "COOLAN TEMP/S" increases to more than 10C (50F) within 65 minutes, stop engine because the test result will be OK. CAUTION: Never overheat engine.
With GST
Follow the procedure "With CONSULT" above.
Diagnosis Procedure
1.CHECK GROUND CONNECTION
2.CHECK ENGINE COOLANT TEMPERATURE SENSOR
3.CHECK THERMOSTAT OPERATION
When the engine is cold [lower than 70C (158F)] condition, grasp lower radiator hose and confirm that the engine coolant does not flow.
4.CHECK INTERMITTENT INCIDENT
Component Inspection
1.CHECK ENGINE COOLANT TEMPERATURE SENSOR
Radiator core support
Exploded View
Radiator core support
Bolts
Removal and Installation
REMOVAL
Remove front bumper. Refer to EXT-16, "Removal and Installation".
Remove front combination lamps (LH/RH). Refer to EXL-154, "Removal
and Installation" (Xenon Type),
EXL-31 ...
Precaution
PRECAUTIONS
Precaution for Supplemental Restraint System (SRS) "AIR BAG" and
"SEAT BELT PRE-TENSIONER
The Supplemental Restraint System such as "AIR BAG" and "SEAT BELT
PRE-TENSIONER", used along with a front seat belt, helps to reduce the risk
or severity of injury to the driver and front p ...
P1800 vias control solenoid valve 1
Description
The VIAS control solenoid valve 1 cuts the intake manifold vacuum signal for
power valve 1 control. It
responds to ON/OFF signals from the ECM. When the solenoid is OFF, the vacuum
signal from the intake
manifold is cut. When the ECM sends an ON signal the coil pulls the plunger ...