Diagnostic Test

WARNING: This page is about a different car, the 2014 RAM 3500 HD and 2014 RAM 2500 HD. However, it is still accessible from the selected car via links, so may be relevant.

ACTIVE DTC
1. Turn the ignition on.
2. Using the scan tool, actuate the Electric Thermostat Heater Solenoid.
3. Using the scan tool, read active DTCs.
  Is the DTC active?
  
  Yes
  - Go To 2
  No
  - Test complete, the condition or conditions that originally set this DTC are not present at this time. Using the wiring diagrams as a guide, check all related splices and connectors for signs of water intrusion, corrosion, pushed out or bent terminals, and correct pin tension.
  - Perform the INTERMITTENT CONDITION diagnostic procedure. Refer to INTERMITTENT CONDITION .
CHECK THE (K223) ELECTRIC HEATED THERMOSTAT CONTROL CIRCUIT FOR A SHORT TO VOLTAGE
1. Turn the ignition off.
2. Disconnect the Electric Heated Thermostat harness connector.
3. Disconnect the PCM C2 harness connector.
  CAUTION:
  Do not probe the PCM harness connectors. Probing the PCM harness connectors will damage the PCM terminals resulting in poor terminal to pin connection. Install the GPEC Diagnostic Adaptor to perform the diagnosis.
4. Connect the (special tool #10436, Adapter, GPEC Diagnostic).
5. Measure the resistance between the (K223) Electric Heated Thermostat Control circuit and all other circuits at the PCM C2 harness connector.
  Is the resistance above 10k Ohms between the (K223) Electric Heated Thermostat Control circuit and all other circuits?
  
  Yes
  - Go To 3
  No
  - Repair the short to between the (K223) Electric Heated Thermostat Control circuit and the circuit that measured below 10k Ohms.
  - Perform the POWERTRAIN VERIFICATION TEST. Refer to POWERTRAIN VERIFICATION TEST .
ELECTRIC HEATED THERMOSTAT
1. Reconnect the PCM C2 harness connector.
2. Replace the Electric Heated Thermostat in accordance with the service information
3. Turn the ignition on.
4. Using the scan tool, erase DTCs.
5. Using the scan tool, actuate the Electric Heated Thermostat Solenoid.
6. Using the scan tool, read active DTCs.
  Did the DTC return?
  
  Yes
  - Go To 4
  No
  - Repair complete.
  - Perform the POWERTRAIN VERIFICATION TEST. Refer to POWERTRAIN VERIFICATION TEST .
POWERTRAIN CONTROL MODULE (PCM)
1. Using the wiring diagram/schematic as a guide, inspect the wiring and connectors between the Electric Heated Thermostat 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. Perform any Technical Service Bulletins that may apply.
  Were any problems found?
  
  Yes
  - Repair as necessary.
  - Perform the POWERTRAIN VERIFICATION TEST. Refer to POWERTRAIN VERIFICATION TEST .
  No
  - Replace and program the Powertrain Control Module (PCM) in accordance with the service information. Refer to MODULE, POWERTRAIN CONTROL, REMOVAL .
  - Perform the POWERTRAIN VERIFICATION TEST. Refer to POWERTRAIN VERIFICATION TEST .