Corvette 2005-2008

Oil Temperature Sensor

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Operation



The engine oil temperature sensor is a thermistor that varies in resistance as the engine oil temperature changes. A low engine oil temperature produces a high resistance at the engine oil temperature sensor. A high engine oil temperature produces a low resistance at the engine oil temperature sensor. The instrument panel cluster (IPC) interfaces with the engine oil temperature sensor via a discreet signal circuit and low reference circuit. The IPC applies 5 volts to the engine oil temperature sensor through an internal input resistor that is connected to the signal circuit of the engine oil temperature sensor. The internal resistor in the IPC measures the voltage and calculates temperature. The engine oil temperature range is between -40 to -165°C (-40 to +329°F).

Removal & Installation



  1. Raise and support the vehicle.
  2.  
  3. Remove the RF tire and wheel assembly.
  4.  
  5. Remove the RH front wheelhouse rear liner.
  6.  
  7. Remove the Oil Temperature Sensor Electrical Connector as shown (1).
  8.  
  9. Remove the Oil Temperature Sensor (2) from the oil tank.
  10.  
  11. Installation is the reverse of removal. Tighten to 15 ft. lbs. (20 Nm).

    Click image to see an enlarged view

    Fig. Location of Oil Temperature Sensor

  12.  

Testing



  1. Ignition OFF, disconnect the harness connector at the engine oil temperature sensor.
  2.  
  3. Ignition OFF, test for less than 1 ohm between the low reference circuit terminal A and ground.
    1. If greater than 1 ohm, test the circuit for an open/high resistance.
    2.  

  4.  
  5. Ignition ON, verify the scan tool Engine Oil Temperature Calculated parameter is less than -10°C (+14°F)
    1. If not, test the signal circuit terminal B for a short to ground. If the circuit tests normal, replace the IPC.
    2.  

  6.  
  7. Ignition ON, install a 3A fused jumper wire between the signal circuit terminal B and the low reference circuit terminal A. Verify the scan tool Engine Oil Temperature Calculated parameter is greater than 150°C (302°F).
    1. If not, test the signal circuit for a short to voltage or an open/high resistance. If the circuit tests normal, replace the IPC.
    2.  

  8.  
  9. If all circuits test normal, test or replace the engine oil temperature sensor.
  10.  

 
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