Diagnostic Test

WARNING: This page is about a different car, the 2014 RAM 1500. However, it is still accessible from the selected car via links, so may be relevant.

DTC IS ACTIVE
1. Ignition on, engine not running.
2. With the scan tool, erase DTCs in the PCM.
3. Monitor the scan tool for at least two minutes.
4. Cycle the ignition key off and on several times, leaving the ignition on for at least 10 seconds at a time.
5. With the scan tool, select View DTCs.
  Is the status Active for this DTC?
  
  Yes
  - Go To 2
  No
  - Perform the INTERMITTENT CONDITION diagnostic procedure. Refer to INTERMITTENT DTC .
ENGINE COOLANT TEMPERATURE SENSOR
1. Disconnect the Engine Coolant Temperature Sensor harness connector.
2. With the scan tool, select View DTCs.
  NOTE:
  The scan tool should display a P0118-Engine Coolant Temperature Sensor High DTC as active with the connector disconnected.
  
  Does the scan tool display the DTC as described above?
  
  Yes
  - Replace the Engine Coolant Temperature Sensor in accordance with the service information.
  - Perform the PCM VERIFICATION TEST. Refer to PCM VERIFICATION TEST .
  No
  - Go To 3
CHECK THE (K2) ENGINE COOLANT TEMPERATURE SENSOR SIGNAL CIRCUIT FOR A SHORT TO GROUND

Fig 1: Checking ECT Sensor Signal Circuit For A Short To Ground
Courtesy of CHRYSLER GROUP, LLC
1. Turn the ignition off.
2. Disconnect the PCM C2 harness connector.
3. Measure the resistance between ground and the (K2) Engine Coolant Temperature Sensor Signal circuit at the Engine Coolant Temperature Sensor harness connector.
  Is the resistance above 10k Ohms?
  
  Yes
  - Go To 4
  No
  - Repair the (K2) Engine Coolant Temperature Sensor Signal circuit for a short to ground.
  - Perform the PCM VERIFICATION TEST. Refer to PCM VERIFICATION TEST .
CHECK FOR THE (K2) ENGINE COOLANT TEMPERATURE SENSOR SIGNAL CIRCUIT SHORTED TO THE (K200) SENSOR GROUND CIRCUIT

Fig 2: Checking ECT Sensor Signal Circuit For A Short To Sensor Ground Circuit
Courtesy of CHRYSLER GROUP, LLC
1. Measure the resistance between the (K2) Engine Coolant Temperature Sensor Signal circuit and the (K200) Sensor Ground circuit at the Engine Coolant Temperature Sensor harness connector.
  Is the resistance above 10k Ohms?
  
  Yes
  - Go To 5
  No
  - Repair the (K2) Engine Coolant Temperature Sensor Signal circuit for a short to the (K200) Sensor Ground circuit.
  - Perform the PCM VERIFICATION TEST. Refer to PCM VERIFICATION TEST .
POWERTRAIN CONTROL MODULE
1. Using the wiring diagram/schematic as a guide, inspect the wiring and connectors between the Engine Coolant Temperature Sensor and the Powertrain Control Module (PCM).
2. Look for any chafed, pierced, pinched, or partially broken wires.
3. Look for broken, bent, pushed out or corroded terminals.
4. Perform any Technical Service Bulletins that may apply.
  Were any problems found?
  
  Yes
  - Repair as necessary.
  - Perform the PCM VERIFICATION TEST. Refer to PCM VERIFICATION TEST .
  No
  - Replace and program the Powertrain Control Module in accordance the service information. Refer to REMOVAL .
  - Perform the PCM VERIFICATION TEST. Refer to PCM VERIFICATION TEST .