Diagnostic Test

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

DTC ACTIVE
1. Ignition on, engine not running.
2. With the scan tool, read DTCs.
  Is DTC P144F active?
  
  Yes
  - Go To 2.
  No
  - Perform the INTERMITTENT CONDITION - 6.7L diagnostic procedure. Refer to INTERMITTENT CONDITION - 6.7L .
CHECK THE (K671) EGR COOLER BYPASS STATUS CIRCUIT FOR A SHORT TO BATTERY VOLTAGE
1. Turn the ignition off.
2. Disconnect the EGR Cooler Bypass valve harness connector.
  NOTE:
  Check connectors - Clean/repair as necessary.
3. Turn the ignition on.
4. Measure the voltage at the (K671) EGR Cooler Bypass Valve Status Line circuit at the EGR Cooler Bypass Valve harness connector.
  Is the voltage equal to battery voltage?
  
  Yes
  - Repair the (K671) EGR Cooler Bypass Valve Status Line 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 SMART POWER RELAY
1. Turn the ignition off.
2. Measure for voltage at the (F344) Smart Power Relay Coil circuit at the EGR Cooler Bypass Valve harness connector.
  Is there any voltage present?
  
  Yes
  - The Smart Power Relay is stuck on. If there are any Smart Power Relay Control circuit DTCs present, diagnose those before replacing the Smart Power Relay.
  - Perform the POWERTRAIN VERIFICATION TEST - 6.7L. Refer to POWERTRAIN VERIFICATION TEST - 6.7L .
  No
  - Go To 4.
CHECK THE EGR COOLER BYPASS VALVE

Fig 1: EGR Cooler Bypass Valve Harness Connector
Courtesy of CHRYSLER LLC
1. Turn the ignition to the off position for a minimum of 10 minutes to allow the PCM to completely power down.
2. Use a jumper wire to connect the (K671) EGR Cooler Bypass Status circuit to ground.
3. Turn the ignition on.
4. With the scan tool, read DTCs.
  Did P144F go inactive?
  
  Yes
  - Replace the EGR Cooler Bypass Valve in accordance with the service information.
    NOTE:
    After inducing the P144F fault, the PCM must be powered down for 10 minutes in able to clear the DTC.
  - Perform the POWERTRAIN VERIFICATION TEST - 6.7L. Refer to POWERTRAIN VERIFICATION TEST - 6.7L .
  No
  - Replace and program the Powertrain Control Module in accordance with the service information. Refer to MODULE, Powertrain Control, 6.7L Diesel, Removal , and PCM/ECM / TCM PROGRAMMING .