Diagnostic Test

WARNING: This page is about a different car, the 2011 RAM Cab & Chassis. However, it is still accessible from the selected car via links, so may be relevant.

ACTIVE DTC
1. Turn the ignition on.
2. With the scan tool, record all Freeze frame data.
3. With the scan tool, erase DTCs.
4. Turn the ignition off for 75 seconds.
5. Turn the ignition on.
6. With the scan tool, read DTCs.
  Did the DTC reset?
  
  Yes
  - Go To 2.
  No
  - Perform the INTERMITTENT CONDITION - 6.7L diagnostic procedure. Refer to INTERMITTENT CONDITION - 6.7L .
CHECK THE (K2) ENGINE COOLANT TEMPERATURE SENSOR SIGNAL CIRCUIT FOR A SHORT TO VOLTAGE

Fig 1: ECT Sensor Connector Pin ID
Courtesy of CHRYSLER LLC
1. Ignition on.
2. Disconnect the Coolant Temperature Sensor harness connector.
3. Measure the voltage of the (K2) Engine Coolant Temperature Sensor (ECT) Signal circuit at the sensor harness connector.
  NOTE:
  The voltage should read approximately 5.0 Volts with connector disconnected and key on.
  
  Is the voltage above 5.1 Volts?
  
  Yes
  - Repair the (K2) ECT Sensor Signal circuit for a short to voltage.
  - Perform the POWERTRAIN VERIFICATION TEST - 6.7L. Refer to POWERTRAIN VERIFICATION TEST - 6.7L .
  No
  - Go To 3.
CHECK THE ENGINE COOLANT TEMPERATURE SENSOR
1. Turn the ignition off.
  NOTE:
  Check connectors - Clean/repair as necessary.
2. Measure the resistance across the terminals of the ECT Sensor.
  Is the resistance between 300 and 90k Ohms?
  
  Yes
  - Go To 4.
  No
  - Replace the Engine Coolant Temperature Sensor in accordance with the service information.
  - Perform the POWERTRAIN VERIFICATION TEST - 6.7L. Refer to POWERTRAIN VERIFICATION TEST - 6.7L .
CHECK THE (K2) ENGINE COOLANT TEMPERATURE SENSOR SIGNAL CIRCUIT FOR AN OPEN/HIGH RESISTANCE

Fig 2: Checking Engine Coolant Temperature Sensor Signal Circuit For Open Or High Resistance
Courtesy of CHRYSLER LLC
1. Disconnect the PCM C1 harness connector.
2. Measure the resistance of the (K2) ECT Sensor Signal circuit between the ECT Sensor harness connector and the PCM C1 harness connector.
  Is the resistance below 5.0 Ohms?
  
  Yes
  - Go To 5.
  No
  - Repair the (K2) ECT Sensor Signal circuit for an open or high resistance.
  - Perform the POWERTRAIN VERIFICATION TEST - 6.7L. Refer to POWERTRAIN VERIFICATION TEST - 6.7L .
CHECK THE (K914) SENSOR RETURN CIRCUIT FOR AN OPEN/HIGH RESISTANCE

Fig 3: Checking Sensor Return Circuit For Open Or High Resistance
Courtesy of CHRYSLER LLC
1. Measure the resistance of the (K914) ECT Sensor Return circuit between the ECT Sensor harness connector and the PCM C1 harness connector.
  Is the resistance below 5.0 Ohms?
  
  Yes
  - Replace the Powertrain Control Module in accordance with the Service Information.
  - Perform the POWERTRAIN VERIFICATION TEST - 6.7L. Refer to POWERTRAIN VERIFICATION TEST - 6.7L .
  No
  - Repair the (K914) ECT Sensor Return circuit for an open or high resistance.
  - Perform the POWERTRAIN VERIFICATION TEST - 6.7L. Refer to POWERTRAIN VERIFICATION TEST - 6.7L .