Journey FWD V6-3.5L (2009)
Coolant Temperature Sensor/Switch (For Computer): Testing and Inspection
CHECKING THE ENGINE COOLANT TEMPERATURE SENSOR OPERATION
For a complete wiring diagram Refer to the Wiring Information See: Diagrams/Electrical Diagrams.
1. ENGINE COOLANT TEMPERATURE SENSOR WIRING OR CONNECTORS
NOTE: Diagnose and repair any ECT circuit DTCs before proceeding with this test.
NOTE: Allow the engine to cool to ambient temperature before proceeding.
1. Using the wiring diagram/schematic as a guide, inspect the wiring and connectors between the Engine Coolant Temperature sensor(s) and the
PCM.
2. Look for any chafed, pierced, pinched, or partially broken wires.
3. Look for broken, bent, pushed out or corroded terminals.
4. Turn the ignition on.
5. Monitor the scan tool data relative to the sensor(s) and wiggle test the wiring and connectors.
6. Look for the data to change or for a DTC to set during the wiggle test.
Were any problems found?
Yes
-
Repair as necessary.
-
Perform the PCM Verification Test. See: Computers and Control Systems/Testing and Inspection/Diagnostic Trouble Code Tests and Associated
Procedures/Verification Tests/PCM Verification Test
No
-
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2. ENGINE COOLANT LEVEL AND CONDITION
WARNING: Make sure the engine cooling system is cool before removing the pressure cap or any hose. The cooling system is pressurized when
hot. Failure to follow these instructions can result in possible serious or fatal injury.
1. Check the engine coolant level and the condition of the engine coolant. Refer to the appropriate Service Information.
Were any problems found?
Yes
-
Repair as necessary.
-
Perform the PCM Verification Test. See: Computers and Control Systems/Testing and Inspection/Diagnostic Trouble Code Tests and Associated
Procedures/Verification Tests/PCM Verification Test
No
-
Go to 3
3. THERMOSTAT
WARNING: Make sure the engine cooling system is cool before removing the pressure cap or any hose. The cooling system is pressurized when
hot. Failure to follow these instructions can result in possible serious or fatal injury.
1. Using the appropriate service information, determine the proper opening temperature of the thermostat.
2. With the scan tool, read the Engine Coolant Temperature Sensor value. If the engine was allowed to cool completely, the value should be
approximately equal to the ambient temperature.
3. Monitor the sensor value on the scan tool.
4. Start the engine.
WARNING: When the engine is operating, do not stand in direct line with the fan. Do not put your hands near the pulleys, belts or fan. Do not
wear loose clothing. Failure to follow these instructions may result in possible serious or fatal injury.
