Ram Truck 1500, 2500 & 3500 (2006-2008)

Testing

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3.7L, 4.7L & 5.7L Engines



  1. Before servicing the vehicle, refer to the Precautions Section.
  2.  
  3. Turn the ignition off.
  4.  
  5. Disconnect the Engine Coolant Temperature (ECT) sensor harness connector.
  6.  
  7. Ignition on, engine not running.
  8.  
  9. Install a scan tool, read the ECT voltage.
  10.  
  11. Connect a jumper wire between the (K2) ECT signal circuit and the (K900) sensor ground circuit in the ECT harness connector.
  12.  
  13. The sensor voltage should be approximately 0.0 volts (plus or minus .1 volt) with the jumper wire in place.
  14.  
  15. Verify that there is good pin to terminal contact in the sensor and Powertrain Control Module (PCM) connectors. Replace the ECT Sensor if no problems were found with the connectors.

    Click image to see an enlarged view

    Fig. Engine Coolant Temperature (ECT) sensor electrical Connector

  16.  

5.9L & 6.7L Diesel Engines



  1. Before servicing the vehicle, refer to the Precautions Section.
  2.  
  3. Disconnect the coolant temperature sensor harness connector.
  4.  
  5. Check connectors clean or repair as necessary.
  6.  
  7. Measure the resistance of the coolant temperature sensor.
  8.  
  9. If the resistance is not between 300-90k ohms replace the coolant temperature sensor.
  10.  

 
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